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Boost Process Sync example hanging
by Shubha Ramani 31 Aug '16

31 Aug '16

on Linux. This code hangs at getline. I replaced "test.exe" with "ls". Why doesn't it work ? https://github.com/BorisSchaeling/boost-process/blob/master/libs/process/ex… Shubha D. Ramanishubharamani(a)gmail.com shubharamani(a)yahoo.com

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[serialization] Problem building boost 1.56 under gcc 5.3
by Nolen, Steven Douglas 31 Aug '16

31 Aug '16

We are trying to build on a linux platform using gcc-5.3. We already have installations for gcc-4.6.1 thru gcc-4.9 that work. When we tried moving to gcc-5.3, the build worked (apparently), but then we saw linking errors of this ilk... <blah, blah, blah> undefined reference to `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::save(std::string const&) The same linking errors happen when we build our code and when we tried just building the demo samples with the package. We have tried building a more recent version of boost and also scouring stackoverflow and others. Anyone having similar issues, or who might be aware of what's happening?

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create_pipe() not working ?
by Shubha Ramani 30 Aug '16

30 Aug '16

Is this example outdated ? How come I can't create a boost pipe ? https://us-mg0.mail.yahoo.com/neo/launch?.rand=3f0ef0mo8jiih#1996284311 boost::process::pipe p = create_pipe(); file_descriptor_sink sink(p.sink, close_handle); execute( run_exe("test.exe"), bind_stdout(sink) ); file_descriptor_source source(p.source, close_handle); stream<file_descriptor_source> is(source); std::string s; std::getline(is, s); Shubha D. Ramanishubharamani(a)gmail.com shubharamani(a)yahoo.com

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[type_erasure] static check of concept compliance
by Joaquin M López Muñoz 30 Aug '16

30 Aug '16

Consider: using any_t=any< boost::mpl::vector< copy_constructible<>, incrementable<> > >; struct foo{}; int main() { std::cout<<std::is_constructible<any_t,foo>::value<<"\n"; } This program outputs 1 as the ctor of boost::type_erasure::any<Concept> if not restricted to Concept-compliant args, but of course we can't use foo to construct any_t: any_t x{foo{}}; // compile error as foo is not incrementable Is there a (publicly available) way to determine if an argument of type U can be used to construct an any<Concept,T>? I'd like to have this for doing SFINAE in my any-using code. Thank you, Joaquín M López Muñoz

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Yet another issue with BGL Deserialization
by giacomo＠openmailbox.org 28 Aug '16

28 Aug '16

I'm trying to both serialize and deserialize the data in a graph format. The definition of my graph is the following one. #include <boost/graph/adjacency_list.hpp> #include <boost/graph/directed_graph.hpp> #include <boost/graph/adj_list_serialize.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_iarchive.hpp> #include <boost/serialization/string.hpp> #include <boost/serialization/binary_object.hpp> class VFull { public: VFull(); unsigned int id, hash, year; std::string ip, organization; VFull(unsigned int id, unsigned int hash, unsigned int year, std::string ip, std::string organization); template<class Archive> void serialize(Archive & ar, const unsigned int version); }; class EFull { public: EFull(); template<class Archive> void serialize(Archive & ar, const unsigned int version); }; class GFull { public: template<class Archive> void serialize(Archive & ar, const unsigned int version); }; //Defining the graph data structure. Using the vecS specification typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS,VFull,EFull,GFull> graph_t; typedef boost::graph_traits<graph_t>::vertex_descriptor result_vertex_descriptor; typedef boost::graph_traits<graph_t>::edge_descriptor result_edge_descriptor; It seems to me that I have no problems in the serialization process, while I have some issues in the deserialization part. In fact, I have no linking errors until this piece of code is added to my source: #include <iomanip> #include <iostream> #include <fstream> { std::ifstream file(path,std::ios_base::binary); boost::archive::binary_iarchive store{file}; store >> graph; // Deserialization part that triggers the error } I tried to read some questions here and to read the Boost manual, but they didn't solve my problem. In particular, I have this error: Undefined symbols for architecture x86_64: "void EFull::serialize<boost::archive::binary_iarchive>(boost::archive::binary_iarchive&, unsigned int)", referenced from: void boost::serialization::access::serialize<boost::archive::binary_iarchive, EFull>(boost::archive::binary_iarchive&, EFull&, unsigned int) in boostOthers.cpp.o "void GFull::serialize<boost::archive::binary_iarchive>(boost::archive::binary_iarchive&, unsigned int)", referenced from: void boost::serialization::access::serialize<boost::archive::binary_iarchive, GFull>(boost::archive::binary_iarchive&, GFull&, unsigned int) in boostOthers.cpp.o "void VFull::serialize<boost::archive::binary_iarchive>(boost::archive::binary_iarchive&, unsigned int)", referenced from: void boost::serialization::access::serialize<boost::archive::binary_iarchive, VFull>(boost::archive::binary_iarchive&, VFull&, unsigned int) in boostOthers.cpp.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) By the way, I'm serializing and deserializing strings and unsigned ints, "native data types" that seems to be supported by boost: //VERTICES VFull::VFull() { } VFull::VFull(unsigned int i, unsigned int h, unsigned int y, std::string p, std::string o) : id{i}, hash{h}, year{y}, ip{p}, organization{o} { } template<class Archive> void VFull::serialize(Archive &ar, const unsigned int version) { ar & 'i'; ar & id; ar & 'h'; ar & hash; ar & '1'; ar & ip; ar & '2'; ar & organization; ar & '3'; ar & year; ar & '/'; } /////// //EDGES EFull::EFull() { } template<class Archive> void EFull::serialize(Archive &ar, const unsigned int version) { char waste = 'e'; ar & waste; } /////// //GRAPH SIGNATURE template<class Archive> void GFull::serialize(Archive &ar, const unsigned int version) { std::string waste = "GBLS"; ar & waste; } /////// Yes, I am linking my source code to both BGL and Boost's serialization. This is acheived through this part of CMake script: find_package( Boost REQUIRED COMPONENTS graph serialization ) set(Boost_USE_STATIC_LIBS ON) set(Boost_USE_MULTITHREADED OFF) INCLUDE_DIRECTORIES( ${Boost_INCLUDE_DIRS} ..some other stuff..) TARGET_LINK_LIBRARIES(mycode ${Boost_LIBRARIES})

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[Boost.Hana] how to merge two or more maps
by Matthijs Möhlmann 25 Aug '16

25 Aug '16

Hi, I am looking into the documentation of hana to merge two or more maps, say: #include <boost/hana.hpp> namespace hana = boost::hana; int main(int argc, char **argv) { constexpr auto m1 = hana::make_map( hana::make_pair("key1"_s, hana::type_c<std::string>), hana::make_pair("key2"_s, hana::type_c<std::string>) ); constexpr auto m2 = hana::make_map( hana::make_pair("key3"_s, hana::type_c<std::string>), hana::make_pair("key4"_s, hana::type_c<std::string>), hana::make_pair("key5"_s, hana::type_c<std::string>) ); // Merge two or more maps? constexpr auto result = m1 + m2; return 0; } I'm not sure how to do this, probably taking the first map and for every pair in the subsequent map return an insert? In pseudo code: constexpr result = hana::insert(hana::insert(m1, pair1), pair2); Can someone give me some pointers in the right direction? Regards, Matthijs

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Fw: Boost-users Digest, Vol 4543, Issue 1
by David Frank 24 Aug '16

24 Aug '16

Thanks Daniel. I go the following errors and some segmentation fault. Is there any additional option to set:? ...skipped <pstage/lib>libboost_wave.so.1.61.0 for lack of <pbin.v2/libs/wave/build/clang-linux-3.6.2/release/threading-multi>libboost_wave.so.1.61.0... ...skipped <pstage/lib>libboost_wave.so for lack of <pstage/lib>libboost_wave.so.1.61.0... ...failed updating 518 targets... ...skipped 170 targets... ...updated 432 targets... On Wednesday, August 24, 2016 12:40 PM, David Frank <david_frank56(a)yahoo.com> wrote: On Wednesday, August 24, 2016 12:00 PM, "boost-users-request(a)lists.boost.org" <boost-users-request(a)lists.boost.org> wrote: Send Boost-users mailing list submissions to boost-users(a)lists.boost.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.boost.org/mailman/listinfo.cgi/boost-users or, via email, send a message with subject or body 'help' to boost-users-request(a)lists.boost.org You can reach the person managing the list at boost-users-owner(a)lists.boost.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Boost-users digest..." Today's Topics: 1. compile boost and boost application with CLANG compiler (David Frank) 2. Re: compile boost and boost application with CLANG compiler (Daniel Hofmann) 3. [Boost.Hana] how to merge two or more maps (Matthijs M?hlmann) 4. [test] Init framework before dataset generation (Florian Lindner) ---------------------------------------------------------------------- Message: 1 Date: Tue, 23 Aug 2016 18:06:42 +0000 (UTC) From: David Frank <david_frank56(a)yahoo.com> To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> Subject: [Boost-users] compile boost and boost application with CLANG compiler Message-ID: <14791342.1048154.1471975602912(a)mail.yahoo.com> Content-Type: text/plain; charset="utf-8" Has anyone successfully compiled boost and application with boost with CLANG compiler?If yes, would you mind sharing the steps?

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compile boost and boost application with CLANG compiler
by David Frank 23 Aug '16

23 Aug '16

Has anyone successfully compiled boost and application with boost with CLANG compiler?If yes, would you mind sharing the steps?

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Boost Asio SSL can't receive without sending
by 刘焕杰 23 Aug '16

23 Aug '16

Hi, I am using Boost Asio to developed a server, with SSL support. I add async_read_some() function in handshake handler and send handler. Which receiving is OK if I send something to clients, but I can't keep receiving after I stop sending things to client. So I am wondering how can I keep receiving, I know there must be a way to make it, I am new to Asio, can someone help, thanks in advance. ------------------ I won't go

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[type_erasure] use of typeid_of with reference any
by Joaquin M López Muñoz 23 Aug '16

23 Aug '16

Boost.TypeErasure docs say template<typename Concept, typename T> const std::type_info & typeid_of(const any< Concept, T > & arg); [...] Requires: Concept includes typeid_<T>. T is a non-reference, CV-unqualified placeholder. which, if my literal reading is right, means that you can't use typeid_of on, say, any<typeid_<>,_self&>, yet the following compiles on GCC #include <boost/type_erasure/any.hpp> #include <boost/type_erasure/builtin.hpp> #include <boost/type_erasure/typeid_of.hpp> #include <iostream> using namespace boost::type_erasure; int main() { int x=0; any<boost::mpl::vector<typeid_<>,relaxed>,_self&> a=x; std::cout<<typeid_of(a).name()<<"\n"; } and correctly outputs the name of the "int" type. Is this a bug in the docs or am I missing something? Thank you, Joaquín M López Muñoz

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How to build Boost agianst specific version of openSSL
by ramonpadilla1＠yahoo.co.uk 22 Aug '16

22 Aug '16

My machine is a Mac with OS X El Capitan installed.Using Homebrew I have installed openssl 1.0.2h_1 but it does not allow it to be linked to usr/local.openssl version -a returns:OpenSSL 0.9.8zh 14 Jan 2016 built on: Feb 4 2016 platform: darwin64-x86_64-llvm options: bn(64,64) md2(int) rc4(ptr,char) des(idx,cisc,16,int) blowfish(idx) compiler: -arch x86_64 -fmessage-length=0 -pipe -Wno-trigraphs -fpascal-strings -fasm-blocks -O3 -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -DL_ENDIAN -DMD32_REG_T=int -DOPENSSL_NO_IDEA -DOPENSSL_PIC -DOPENSSL_THREADS -DZLIB -mmacosx-version-min=10.6 OPENSSLDIR: "/System/Library/OpenSSL"which openssl returns /usr/bin/openssl.I want to build Boost but I understand from the answer posted to this question that Boost will use the openssl version provided by the system.How do I force the boost build to use the version of openssl I have installed via Homebrew?

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Re: [Boost-users] Boost Asio SSL can't receive without sending
by 刘焕杰 22 Aug '16

22 Aug '16

Hi Radu, yes, I have called run() on the ioservice. And I still can't figure out why, do I need to keep sending things to client? Thanks for reply. ------------------ jenenliu ------------------ Original ------------------ From: "Radu Andrei Nedelcu";<radu(a)disruptive.engineering>; Date: Fri, Aug 19, 2016 11:35 PM To: "boost-users(a)lists.boost.org"<boost-users(a)lists.boost.org>; Subject: Re: [Boost-users] Boost Asio SSL can't receive without sending Are you calling run( ) on the ioservice ( boost::asio::io_service ) ? Radu From: Boost-users [mailto:boost-users-bounces@lists.boost.org] On Behalf Of ??? Sent: 19 August 2016 07:57 To: boost-users <boost-users(a)lists.boost.org> Subject: [Boost-users] Boost Asio SSL can't receive without sending Hi, I am using Boost Asio to developed a server, with SSL support. I add async_read_some() function in handshake handler and send handler. Which receiving is OK if I send something to clients, but I can't keep receiving after I stop sending things to client. So I am wondering how can I keep receiving, I know there must be a way to make it, I am new to Asio, can someone help, thanks in advance. ------------------ I won't go

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[math] Undefined reference to promote_args
by Florian Lindner 18 Aug '16

18 Aug '16

Hello, when compiling a file that uses float_distance from #include <boost/math/special_functions/relative_difference.hpp> I get a linking error: undefined reference to `boost::math::tools::promote_args<double, double, float, float, float, float>::type boost::math::float_distance<double, double>(double const&, double const&)' I try to add all boost_math libs I could find, but none helped: -lboost_system -lboost_filesystem -lboost_math_tr1 -lboost_math_c99 -lboost_math_c99 Since float_distance is not a C99 / TR1 function, should'nt boost.math work as header only? What is the problem here? Thanks, Florian

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Custom build of Python3 not picked up by Boost.Build
by Matthieu Brucher 17 Aug '16

17 Aug '16

Hi, As I need a build of Python3 compatible with VS2012, I built it from scratch and installed it in a _INSTALL folder, following a tutorial online. Now, I want to use that Python3 with Boost.Python, so I did this in my use-config.jam: using python : 3.4 : D:/Tools/Python-3.4.5/_INSTALL/python.exe : D:/Tools/Python-3.4.5/_INSTALL/include : D:/Tools/Python-3.4.5/_INSTALL/libs ; And then: .\bootstrap.bat --with-python=D:\Tools\Python-3.4.5\_INSTALL --with-python-version=3.4 --python-buildid=3 which failed. The includes are found properly, but the link is floawed: LINK : fatal error LNK1104: cannot open file 'python34.lib' The library is in D:/Tools/Python-3.4.5/_INSTALL/libs, but could not be found according to the log. Also, something strange: D:\Tools\boost_1_60_0\tools\build\src\engine>.\bootstrap\jam0 -f build.jam --toolset=vc14 "--toolset-root=C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Tools\..\..\VC\ " --with-python=D:\Tools\Python-3.4.5\_INSTALL --with-python-version=3.4 --python-buildid=3 The retrieved toolset is wrong, as explicitely asked for VS2012 aka 11.0 int he user-config.jam and I'm running it from a VS2012 x64 native tools command prompt. Couldn't find any help online, so the best is to ask the Boost community! Regards, Matthieu -- Information System Engineer, Ph.D. Blog: http://blog.audio-tk.com/ LinkedIn: http://www.linkedin.com/in/matthieubrucher

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Re: [Boost-users] Boost-users Digest, Vol 4538, Issue 1
by David Frank 17 Aug '16

17 Aug '16

Galvin,that was reported when boost version 61 was used, and the application was compiled with g++ version 5.21 with options CFLAGS += -fsanitize=alignment CFLAGS += -fsanitize=object-size CFLAGS += -fsanitize=vptr Thanks, David. On Tuesday, August 16, 2016 7:39 AM, "boost-users-request(a)lists.boost.org" <boost-users-request(a)lists.boost.org> wrote: Send Boost-users mailing list submissions to boost-users(a)lists.boost.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.boost.org/mailman/listinfo.cgi/boost-users or, via email, send a message with subject or body 'help' to boost-users-request(a)lists.boost.org You can reach the person managing the list at boost-users-owner(a)lists.boost.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Boost-users digest..." Today's Topics: 1. Re: some runtime errors in shared_count.hpp (Gavin Lambert) 2. [boost][multiprecision] compile error with gcc 4.8.4 (Rob Conde) 3. [property_tree] - unsuppressed warning under VS2015 Update 3 (Tamas.Ruszkai(a)leica-geosystems.com) 4. Re: [boost][multiprecision] compile error with gcc 4.8.4 (John Maddock) 5. Custom build of Python3 not picked up by Boost.Build (Matthieu Brucher) ---------------------------------------------------------------------- Message: 1 Date: Tue, 16 Aug 2016 11:21:20 +1200 From: Gavin Lambert <gavinl(a)compacsort.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] some runtime errors in shared_count.hpp Message-ID: <notipk$ak9$1(a)blaine.gmane.org> Content-Type: text/plain; charset=windows-1252; format=flowed On 15/08/2016 23:04, David Frank wrote: > boost/smart_ptr/detail/shared_count.hpp:484:41: runtime error: member > call on address 0x0000055807b0 which does not point to an object of type > 'sp_counted_base' > 0x0000055807b0: note: object is of type > 'boost::detail::sp_counted_impl_p<boost::detail::thread_data_base>' > 00 00 00 00 10 82 bd b4 c1 7f 00 00 01 00 00 00 01 00 00 00 c0 29 5a > 05 00 00 00 00 41 00 00 00 > ^~~~~~~~~~~~~~~~~~~~~~~ Given that sp_counted_base is a base class of sp_counted_impl_p<>, I'm inclined to think that whatever is reporting that is confused. It's also useless to make a post like this without specifying what version of Boost you are using and which tool is reporting these errors. ------------------------------ Message: 2 Date: Tue, 16 Aug 2016 00:59:24 +0000 From: Rob Conde <rob.conde(a)ai-solutions.com> To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> Subject: [Boost-users] [boost][multiprecision] compile error with gcc 4.8.4 Message-ID: <BN3PR0801MB23065F715AE0B9931115AE27C8130(a)BN3PR0801MB2306.namprd08.prod.outlook.com> Content-Type: text/plain; charset="windows-1252" Please see the scenario below...am I doing something wrong or is this a gcc or multiprecision bug? Thanks, Rob Conde given the following code (multiPrecisionTest.cpp): #include <boost/multiprecision/cpp_int.hpp> #include <boost/multiprecision/cpp_bin_float.hpp> typedef boost::multiprecision::int128_t int128_t; typedef boost::multiprecision::cpp_bin_float_quad float128_t; int main() { int128_t intVal; float128_t floatVal(intVal.convert_to<float128_t>()); return 0; } -------------------------------------------------------------------------- g++ -std=c++0x -c multiPrecisionTest.cpp I get the following error: In file included from ./boost/multiprecision/cpp_int.hpp:1936:0, from multiPrecisionTest.cpp:1: ./boost/multiprecision/cpp_int/misc.hpp: In instantiation of ?typename boost::enable_if_c<(boost::multiprecision::backends::is_trivial_cpp_int<boost::multiprecision::backends::cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value && boost::multiprecision::is_signed_number<boost::multiprecision::backends::cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value)>::type boost::multiprecision::backends::eval_convert_to(R*, const boost::multiprecision::backends::cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>&) [with R = boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u, (boost::multiprecision::backends::digit_base_type)2u, void, short int, -16382, 16383>, (boost::multiprecision::expression_template_option)0u>; unsigned int MinBits1 = 128u; unsigned int MaxBits1 = 128u; boost::multiprecision::cpp_integer_type SignType1 = (boost::multiprecision::cpp_integer_type)1u; boost::multiprecis ion::cpp_int_check_type Checked1 = (boost::multiprecision::cpp_int_check_type)0u; Allocator1 = void; typename boost::enable_if_c<(boost::multiprecision::backends::is_trivial_cpp_int<boost::multiprecision::backends::cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value && boost::multiprecision::is_signed_number<boost::multiprecision::backends::cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value)>::type = void]?: ./boost/multiprecision/number.hpp:585:40: required from ?void boost::multiprecision::number<Backend, ExpressionTemplates>::convert_to_imp(T*) const [with T = boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u, (boost::multiprecision::backends::digit_base_type)2u, void, short int, -16382, 16383>, (boost::multiprecision::expression_template_option)0u>; Backend = boost::multiprecision::backends::cpp_int_backend<128u, 128u, (boost::multiprecision::cpp_integer_type)1u, (boost::multiprecision::cpp_int_check_type)0u, void>; boost::multiprecision::expression_template_option ExpressionTemplates = (boost::multiprecision::expression_template_option)0u]? ./boost/multiprecision/number.hpp:601:29: required from ?T boost::multiprecision::number<Backend, ExpressionTemplates>::convert_to() const [with T = boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u, (boost::multiprecision::backends::digit_base_type)2u, void, short int, -16382, 16383>, (boost::multiprecision::expression_template_option)0u>; Backend = boost::multiprecision::backends::cpp_int_backend<128u, 128u, (boost::multiprecision::cpp_integer_type)1u, (boost::multiprecision::cpp_int_check_type)0u, void>; boost::multiprecision::expression_template_option ExpressionTemplates = (boost::multiprecision::expression_template_option)0u]? multiPrecisionTest.cpp:10:54: required from here ./boost/multiprecision/cpp_int/misc.hpp:533:138: error: no type named ?type? in ?struct boost::common_type<boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u, (boost::multiprecision::backends::digit_base_type)2u, void, short int, -16382, 16383>, (boost::multiprecision::expression_template_option)0u>, __int128 unsigned>? typedef typename common_type<R, typename cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>::local_limb_type>::type common_type; ^

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[property_tree] - unsuppressed warning under VS2015 Update 3
by Tamas.Ruszkai＠leica-geosystems.com 16 Aug '16

16 Aug '16

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some runtime errors in shared_count.hpp
by David Frank 15 Aug '16

15 Aug '16

boost/smart_ptr/detail/shared_count.hpp:484:41: runtime error: member call on address 0x0000055807b0 which does not point to an object of type 'sp_counted_base' 0x0000055807b0: note: object is of type 'boost::detail::sp_counted_impl_p<boost::detail::thread_data_base>' 00 00 00 00 10 82 bd b4 c1 7f 00 00 01 00 00 00 01 00 00 00 c0 29 5a 05 00 00 00 00 41 00 00 00 ^~~~~~~~~~~~~~~~~~~~~~~ vptr for 'boost::detail::sp_counted_impl_p<boost::detail::thread_data_base>' boost/smart_ptr/detail/shared_count.hpp:625:43: runtime error: member call on address 0x0000055807b0 which does not point to an object of type 'sp_counted_base' 0x0000055807b0: note: object is of type 'boost::detail::sp_counted_impl_p<boost::detail::thread_data_base>' 00 00 00 00 10 82 bd b4 c1 7f 00 00 02 00 00 00 01 00 00 00 c0 29 5a 05 00 00 00 00 41 00 00 00 ^~~~~~~~~~~~~~~~~~~~~~~ vptr for 'boost::detail::sp_counted_impl_p<boost::detail::thread_data_base>' boost/smart_ptr/detail/shared_count.hpp:473:36: runtime error: member call on address 0x0000055807b0 which does not point to an object of type 'sp_counted_base' 0x0000055807b0: note: object is of type 'boost::detail::sp_counted_impl_p<boost::detail::thread_data_base>' 00 00 00 00 10 82 bd b4 c1 7f 00 00 02 00 00 00 02 00 00 00 c0 29 5a 05 00 00 00 00 41 00 00 00 ^~~~~~~~~~~~~~~~~~~~~~~ vptr for 'boost::detail::sp_counted_impl_p<boost::detail::thread_data_base>'

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[MSM] templated state machine generates many errors when a state is derived from msm::front::exit_pseudo_state<event>
by Richard Hodges 15 Aug '16

15 Aug '16

I just wanted to check that there was not something obvious I am doing wrong here: relevant parts: the exit state (defined outside the state machine) struct QueryGood { QueryGood(query_complete const& r) : result(r.result) {} // note: universal converting constructor template<class T> QueryGood(const T&) {} pkt result; }; template<class Environment> struct dns_query_ : msm::front::state_machine_def<dns_query_<Environment>> { // error happens when I derive from exit_pseudo_state. deriving from msmf::state<> eliminates all errors struct Complete : msm::front::exit_pseudo_state<QueryGood> // msmf::state<> { ... }; ... // transition table: struct transition_table : mpl::vector< // Start Event Next Action Guard // +--------------+---------------------+--------------+---------------------+----------------------+ msmf::Row < NotStarted , RestartQuery , Querying , msmf::none , msmf::none >, msmf::Row < Complete , RestartQuery , Querying , msmf::none , msmf::none >, msmf::Row < Error , RestartQuery , Querying , msmf::none , msmf::none >, msmf::Row < Querying , query_timeout , Error , NotifyUpdate , IsCurrentEvent >, msmf::Row < Querying , RestartQuery , Querying , msmf::none , msmf::none >, msmf::Row < Querying , query_error , Error , NotifyUpdate , IsCurrentEvent >, msmf::Row < Querying , query_complete , Complete , NotifyUpdate , IsCurrentEvent > // +--------------+---------------------+--------------+---------------------+----------------------+ > {}; }; sample of errors: /Users/rhodges/secr/xcode-secr/target_local/include/boost/msm/back/metafunctions.hpp:578:79: error: no type named 'owner' in 'secr::wrapldns::dns_query_<query_host>::Complete' typename ::boost::mpl::not_<typename ::boost::is_same<typename State::owner, ~~~~~~~~~~~~~~~~^~~~~ In file included from /Users/rhodges/secr/secr/wrapldns/tests/test_query_algo.cpp:3: In file included from /Users/rhodges/secr/secr/wrapldns/include/secr/wrapldns/query_feed.hpp:5: In file included from /Users/rhodges/secr/secr/valuelib/debug/include/valuelib/debug/trace.hpp:23: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/log/trivial.hpp:21: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/log/keywords/severity.hpp:18: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/keyword.hpp:9: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/unwrap_cv_reference.hpp:12: /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/eval_if.hpp:38:22: note: in instantiation of template class 'boost::msm::back::get_owner<secr::wrapldns::dns_query_<query_host>::Complete, boost::msm::back::state_machine<secr::wrapldns::dns_query_<query_host>, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_> >' requested here typedef typename f_::type type; ^ In file included from /Users/rhodges/secr/secr/wrapldns/tests/test_query_algo.cpp:6: In file included from /Users/rhodges/secr/secr/wrapldns/src/sm/stale_timer.hpp:3: In file included from /Users/rhodges/secr/secr/wrapldns/src/sm/config.hpp:5: /Users/rhodges/secr/xcode-secr/target_local/include/boost/msm/back/state_machine.hpp:630:40: note: in instantiation of template class 'boost::mpl::eval_if<mpl_::bool_<true>, boost::msm::back::get_owner<secr::wrapldns::dns_query_<query_host>::Complete, boost::msm::back::state_machine<secr::wrapldns::dns_query_<query_host>, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_> >, boost::mpl::identity<secr::wrapldns::dns_query_<query_host>::Complete> >' requested here typedef typename ::boost::mpl::eval_if< ^ In file included from /Users/rhodges/secr/secr/wrapldns/tests/test_query_algo.cpp:6: In file included from /Users/rhodges/secr/secr/wrapldns/src/sm/stale_timer.hpp:3: In file included from /Users/rhodges/secr/secr/wrapldns/src/sm/config.hpp:5: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/msm/back/state_machine.hpp:59: /Users/rhodges/secr/xcode-secr/target_local/include/boost/msm/back/metafunctions.hpp:85:22: note: in instantiation of template class 'boost::msm::back::state_machine<secr::wrapldns::dns_query_<query_host>, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::_row_<boost::msm::front::Row<secr::wrapldns::dns_query_<query_host>::Complete, secr::wrapldns::RestartQuery, secr::wrapldns::dns_query_<query_host>::Querying, boost::msm::front::none, boost::msm::front::none> >' requested here typedef typename Transition::current_state_type type; ^ In file included from /Users/rhodges/secr/secr/wrapldns/tests/test_query_algo.cpp:3: In file included from /Users/rhodges/secr/secr/wrapldns/include/secr/wrapldns/query_feed.hpp:5: In file included from /Users/rhodges/secr/secr/valuelib/debug/include/valuelib/debug/trace.hpp:23: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/log/trivial.hpp:21: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/log/keywords/severity.hpp:18: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/keyword.hpp:10: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/tag.hpp:8: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/tagged_argument.hpp:10: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/arg_list.hpp:17: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/apply.hpp:25: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/lambda.hpp:22: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/aux_/full_lambda.hpp:25: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/quote.hpp:23: /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/aux_/has_type.hpp:20:1: note: in instantiation of template class 'boost::msm::back::transition_source_type<boost::msm::back::state_machine<secr::wrapldns::dns_query_<query_host>, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::_row_<boost::msm::front::Row<secr::wrapldns::dns_query_<query_host>::Complete, secr::wrapldns::RestartQuery, secr::wrapldns::dns_query_<query_host>::Querying, boost::msm::front::none, boost::msm::front::none> > >' requested here BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(has_type, type, true) ^ In file included from /Users/rhodges/secr/secr/wrapldns/tests/test_query_algo.cpp:3: In file included from /Users/rhodges/secr/secr/wrapldns/include/secr/wrapldns/query_feed.hpp:5: In file included from /Users/rhodges/secr/secr/valuelib/debug/include/valuelib/debug/trace.hpp:23: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/log/trivial.hpp:21: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/log/keywords/severity.hpp:18: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/keyword.hpp:10: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/tag.hpp:8: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/tagged_argument.hpp:10: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/arg_list.hpp:10: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/result_of0.hpp:7: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/utility/result_of.hpp:21: /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/has_xxx.hpp:245:65: note: expanded from macro 'BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF' , boost::mpl::aux::type_wrapper<BOOST_MSVC_TYPENAME U::name>* = 0 \ ^ In file included from /Users/rhodges/secr/secr/wrapldns/tests/test_query_algo.cpp:3: In file included from /Users/rhodges/secr/secr/wrapldns/include/secr/wrapldns/query_feed.hpp:5: In file included from /Users/rhodges/secr/secr/valuelib/debug/include/valuelib/debug/trace.hpp:23: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/log/trivial.hpp:21: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/log/keywords/severity.hpp:18: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/keyword.hpp:10: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/tag.hpp:8: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/tagged_argument.hpp:10: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/arg_list.hpp:17: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/apply.hpp:25: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/lambda.hpp:22: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/aux_/full_lambda.hpp:25: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/quote.hpp:23: /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/aux_/has_type.hpp:20:1: note: while substituting deduced template arguments into function template 'test' [with U = boost::msm::back::transition_source_type<boost::msm::back::state_machine<secr::wrapldns::dns_query_<query_host>, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::_row_<boost::msm::front::Row<secr::wrapldns::dns_query_<query_host>::Complete, secr::wrapldns::RestartQuery, secr::wrapldns::dns_query_<query_host>::Querying, boost::msm::front::none, boost::msm::front::none> > >] In file included from /Users/rhodges/secr/secr/wrapldns/tests/test_query_algo.cpp:3: In file included from /Users/rhodges/secr/secr/wrapldns/include/secr/wrapldns/query_feed.hpp:5: In file included from /Users/rhodges/secr/secr/valuelib/debug/include/valuelib/debug/trace.hpp:23: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/log/trivial.hpp:21: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/log/keywords/severity.hpp:18: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/keyword.hpp:10: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/tag.hpp:8: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/tagged_argument.hpp:10: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/arg_list.hpp:10: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/result_of0.hpp:7: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/utility/result_of.hpp:21: /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/has_xxx.hpp:253:18: note: expanded from macro 'BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF' sizeof(gcc_3_2_wknd::test(static_cast<t_*>(0))) \ ^ In file included from /Users/rhodges/secr/secr/wrapldns/tests/test_query_algo.cpp:3: In file included from /Users/rhodges/secr/secr/wrapldns/include/secr/wrapldns/query_feed.hpp:5: In file included from /Users/rhodges/secr/secr/valuelib/debug/include/valuelib/debug/trace.hpp:23: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/log/trivial.hpp:21: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/log/keywords/severity.hpp:18: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/keyword.hpp:10: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/tag.hpp:8: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/tagged_argument.hpp:10: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/aux_/arg_list.hpp:17: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/apply.hpp:25: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/lambda.hpp:22: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/aux_/full_lambda.hpp:25: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/quote.hpp:45: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/aux_/include_preprocessed.hpp:37: /Users/rhodges/secr/xcode-secr/target_local/include/boost/mpl/aux_/preprocessed/gcc/quote.hpp:36:20: note: (skipping 36 contexts in backtrace; use -ftemplate-backtrace-limit=0 to see all) , aux::has_type< F<U1> >::value ^ In file included from /Users/rhodges/secr/secr/wrapldns/tests/test_query_algo.cpp:6: In file included from /Users/rhodges/secr/secr/wrapldns/src/sm/stale_timer.hpp:3: In file included from /Users/rhodges/secr/secr/wrapldns/src/sm/config.hpp:5: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/msm/back/state_machine.hpp:53: In file included from /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter.hpp:11: /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/parameters.hpp:585:24: note: in instantiation of template class 'boost::parameter::aux::make_arg_list_aux<boost::parameter::aux::item<boost::parameter::required<boost::msm::back::tag::front_end, boost::parameter::aux::use_default>, secr::wrapldns::query_wrapper_<query_host>, boost::parameter::void_>, boost::parameter::aux::deduced_item<boost::parameter::optional<boost::parameter::deduced<boost::msm::back::tag::history_policy>, has_history_policy<mpl_::arg<-1>, mpl_::bool_<false> > >, boost::parameter::aux::deduced_item<boost::parameter::optional<boost::parameter::deduced<boost::msm::back::tag::compile_policy>, has_compile_policy<mpl_::arg<-1>, mpl_::bool_<false> > >, boost::parameter::aux::deduced_item<boost::parameter::optional<boost::parameter::deduced<boost::msm::back::tag::fsm_check_policy>, has_fsm_check<mpl_::arg<-1>, mpl_::bool_<false> > >, boost::parameter::aux::deduced_item<boost::parameter::optional<boost::parameter::deduced<boost::msm::back::tag::queue_container_policy>, has_queue_container_policy<mpl_::arg<-1>, mpl_::bool_<false> > >, boost::parameter::void_> > > >, boost::parameter::aux::tag_template_keyword_arg, mpl_::bool_<true>, boost::mpl::set0<mpl_::na>, boost::parameter::aux::empty_arg_list, boost::parameter::void_>' requested here typedef typename make_arg_list_aux< ^ /Users/rhodges/secr/xcode-secr/target_local/include/boost/parameter/parameters.hpp:817:31: note: in instantiation of template class 'boost::parameter::aux::make_arg_list<boost::parameter::aux::item<boost::parameter::required<boost::msm::back::tag::front_end, boost::parameter::aux::use_default>, secr::wrapldns::query_wrapper_<query_host>, boost::parameter::void_>, boost::parameter::aux::deduced_item<boost::parameter::optional<boost::parameter::deduced<boost::msm::back::tag::history_policy>, has_history_policy<mpl_::arg<-1>, mpl_::bool_<false> > >, boost::parameter::aux::deduced_item<boost::parameter::optional<boost::parameter::deduced<boost::msm::back::tag::compile_policy>, has_compile_policy<mpl_::arg<-1>, mpl_::bool_<false> > >, boost::parameter::aux::deduced_item<boost::parameter::optional<boost::parameter::deduced<boost::msm::back::tag::fsm_check_policy>, has_fsm_check<mpl_::arg<-1>, mpl_::bool_<false> > >, boost::parameter::aux::deduced_item<boost::parameter::optional<boost::parameter::deduced<boost::msm::back::tag::queue_container_policy>, has_queue_container_policy<mpl_::arg<-1>, mpl_::bool_<false> > >, boost::parameter::void_> > > >, boost::parameter::aux::tag_template_keyword_arg, mpl_::bool_<true> >' requested here typedef typename aux::make_arg_list< ^ In file included from /Users/rhodges/secr/secr/wrapldns/tests/test_query_algo.cpp:6: In file included from /Users/rhodges/secr/secr/wrapldns/src/sm/stale_timer.hpp:3: In file included from /Users/rhodges/secr/secr/wrapldns/src/sm/config.hpp:5: /Users/rhodges/secr/xcode-secr/target_local/include/boost/msm/back/state_machine.hpp:150:47: note: in instantiation of template class 'boost::parameter::parameters<boost::parameter::required<boost::msm::back::tag::front_end, boost::parameter::aux::use_default>, boost::parameter::optional<boost::parameter::deduced<boost::msm::back::tag::history_policy>, has_history_policy<mpl_::arg<-1>, mpl_::bool_<false> > >, boost::parameter::optional<boost::parameter::deduced<boost::msm::back::tag::compile_policy>, has_compile_policy<mpl_::arg<-1>, mpl_::bool_<false> > >, boost::parameter::optional<boost::parameter::deduced<boost::msm::back::tag::fsm_check_policy>, has_fsm_check<mpl_::arg<-1>, mpl_::bool_<false> > >, boost::parameter::optional<boost::parameter::deduced<boost::msm::back::tag::queue_container_policy>, has_queue_container_policy<mpl_::arg<-1>, mpl_::bool_<false> > >, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::bind<secr::wrapldns::query_wrapper_<query_host>, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>' requested here typename state_machine_signature::bind<A0,A1,A2,A3,A4>::type, ::boost::msm::back::tag::front_end ^ /Users/rhodges/secr/secr/wrapldns/tests/test_query_algo.cpp:123:24: note: in instantiation of template class 'boost::msm::back::state_machine<secr::wrapldns::query_wrapper_<query_host>, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>' requested here state_machine_type _state_machine; ^ /Users/rhodges/secr/secr/wrapldns/tests/test_query_algo.cpp:362:3: note: in instantiation of template class 'has_state_machine<query_host, secr::wrapldns::query_wrapper>' requested here : has_state_machine<query_host, secr::wrapldns::query_wrapper> ^

2 1

Boost Units initialize quantity with signaling NaN
by Belcourt, Kenneth 13 Aug '16

13 Aug '16

Hi, I’m trying to find a way to initialize a Boost Unit with a signaling NaN, not just a NaN with the signal cleared. It seems that the only way to initialize a quantity is by multiplying by the unit, and that multiplication clears the signal on the NaN. I know I can just modify the quantity.hpp header and initialize the default constructor val_ member with the signaling NaN, but I was hoping for a cleaner solution. Here’s an example (typed in by hand, not tested): const double s_nan = std::numeric_limits<double>::signaling_NaN(); typedef quantity<si::acceleration, double> acceleration_t; BOOST_UNITS_STATIC_CONSTANT(acceleration_u, acceleration); acceleration_t a(s_nan * acceleration_u); // <— this clears the signal on the NaN Has anyone encountered this or know of a more elegant solution than modifying the quantity.hpp header? — Noel

2 3

[Wave] Wave samples and driver utility not building?
by Michael Young 12 Aug '16

12 Aug '16

I have just built boost_1_61_0; I am particularly interested in Boost.Wave at this time. This is my first attempt to build any boost library, or boost in its entirety (all libs). I read and followed the build instructions from the web site, with slight modifications for my environment / purposes: bootstrap.sh 2>&1 | tee build_boost_log.txt sudo ./b2 install 2>&1 | tee -a build_boost_log.txt When it completes, I get the libboost_*.a and .so files in /usr/local/lib, and the source is installed at /usr/local/include/boost, as expected. I do get "...failed updating 58 targets..." in the build output, but my understanding is that's OK - I didn't install optional items like ICU and such. The problem is that I can't find the wave driver (or other sample) utility anywhere. Moreover, when I look at the build log, there is no indication that any of these are being built (even attempted). So I'm wondering if there's a build step / option that I am missing (and/or perhaps I need one of the "optional" 3rd party packages installed?). BTW - I'm building in Ubuntu 14.04 ARM (crouton chroot on Chromebook), with gcc/g++ 4.8.4. I didn't see any indication of any environment problems in the build log.

2 1

[Asio] Making custom std::streambuf for async_read
by knarks＠online.de 11 Aug '16

11 Aug '16

At the moment I'm using async_read with boost::asio::streambuf and this works fine but I need a custom stream where every invoke to async_read appends the data to my stream. The stream should be based on std::streambuf because I want to keep the asio interface hidden to the user. My first idea was to search for the problem and I ended up with reading about MutableBufferSequence but I don't know if this is the right way and how to implement this in my streambuf object. Any help is higly appreciated.

2 4

Re: [Boost-users] [spirit][karma] multiprecision modf
by Daniel Brake 08 Aug '16

08 Aug '16

Thanks for the reply, John. I think for now I will simply use the .str() method for mpfr_float, since my policies for printing numbers need the entire number (or really, some portion of the number which is known at runtime, but not necessarily at compile time). Any help from the Boost.Spirit people on connecting Boost.Multiprecision variable-precision types would be swell. I am happy to help with this. I already use Spirit.Qi for parsing, and love it, so really want to be able to use Karma in full, as well. Thanks, Daniel > > ---------- Forwarded message ---------- > From: John Maddock <jz.maddock(a)googlemail.com> > To: boost-users(a)lists.boost.org > Cc: > Date: Wed, 3 Aug 2016 18:14:05 +0100 > Subject: Re: [Boost-users] [spirit][karma] multiprecision modf > > Here's the new error message: >> >> In file included from test/generating/mpfr_float.cpp:27: >> In file included from ./include/bertini2/io/generators.hpp:44: >> In file included from /usr/local/include/boost/spiri >> t/include/karma.hpp:16: >> In file included from /usr/local/include/boost/spirit/home/karma.hpp:15: >> In file included from /usr/local/include/boost/spiri >> t/home/karma/numeric.hpp:16: >> In file included from /usr/local/include/boost/spiri >> t/home/karma/numeric/real.hpp:32: >> /usr/local/include/boost/spirit/home/karma/numeric/real_policies.hpp:263:39: >> error: incompatible operand types ('int' and 'typename >> enable_if_c<number_category<detail::expression<function, >> log10_funct<mpfr_float_backend<0, allocate_dynamic> >, >> number<mpfr_float_backend<0, >> allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, >> void, void> >::value == number_kind_floating_point, >> detail::expression<detail::function, detail::floor_funct<typename >> detail::backend_type<detail::expression<function, >> log10_funct<mpfr_float_backend<0, allocate_dynamic> >, >> number<mpfr_float_backend<0, allocate_dynamic>, >> boost::multiprecision::expression_template_option::et_on>, void, void> >> >::type>, detail::expression<function, log10_funct<mpfr_float_backend<0, >> allocate_dynamic> >, number<mpfr_float_backend<0, >> allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, >> void, void> > >> >::type' (aka 'boost::multiprecision::detail >> ::expression<boost::multiprecision::detail::function, >> boost::multiprecision::detail::floor_funct<boost::multipreci >> sion::backends::mpfr_float_backend<0, allocate_dynamic> >, >> boost::multiprecision::detail::expression<boost::multiprecis >> ion::detail::function, >> boost::multiprecision::detail::log10_funct<boost::multipreci >> sion::backends::mpfr_float_backend<0, allocate_dynamic> >, >> boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, >> allocate_dynamic>, >> boost::multiprecision::expression_template_option::et_on>, void, void>, >> void, void>')) >> (traits::test_zero(n) ? 0 : floor(log10(n))) + 1; >> > > I'm afraid that code is incompatible with expression templates: the two > halves of the conditional expression have different/unrelated types which > aren't convertible to each other. An explicit cast is needed here to make > the code expression-template compatible. Or else use a number type with > expression templates turned off. Suggest you contact the spirit developers > (they have their own mailing list I believe) and see what their intent is > here. > > As a last question, I am unsure about the use of the a function parameter >> in my specialization BertiniNumPolicy<mpfr_float>, particularly the >> precision(mpfr_float) function. In the documentation and examples I have >> seen for specializations, this function doesn't use the argument. Is it ok >> that it does, that it checks the actual precision of x??? See above code. >> An alternate method for me might be to just use the str() method provided >> by the number<...> from Multiprecision, but it seems like since this type >> is numeric, I'd like to be able to generate using the numeric generators >> from Karma. >> > > That looks to be the intent yes. Note however, that it's a conceptual > requirement of karma that the number have numeric_limits specialized - > that's not true for type mpfr_float since most of the fields would have to > vary at runtime which isn't possible for numeric_limits. Technically we > could provide a specialization that defines the members that are constant > and leaves the others as undefined/zero/infinity, but it's not clear what's > the right thing to do here - numeric_limits wasn't designed for this kind > of type it seems :( > > I'm changing the subject line to include spirit/karma in hopes that their > developers will see this and chip in.... we should really find a way to > make the libraries work better together. > > HTH, John. > > > > ---------- Forwarded message ---------- > From: Gavin Lambert <gavinl(a)compacsort.com> > To: boost-users(a)lists.boost.org > Cc: > Date: Thu, 4 Aug 2016 16:05:12 +1200 > Subject: Re: [Boost-users] boost::serialization::array for Orocos RTT > On 3/08/2016 23:29, Sambeet Panigrahi wrote: > >> I gave the following includes >> #include <boost/serialization/array.hpp> >> #include <boost/array.hpp> >> >> I know boost::array exists,but does boost::serialization::array >> exist?Because in the namespace serialization in the >> boost/serialization/array.hpp, I could not find such a template. >> >> namespace boost { namespace serialization { >> > [...] > >> template<class T> >> class array_wrapper : >> public wrapper_traits<const array_wrapper< T > > >> > > Looks like it's called array_wrapper instead of array in your version. > > Which is odd, since you claimed to be using 1.44, and these say > differently: > > http://www.boost.org/doc/libs/1_44_0/boost/serialization/array.hpp > > > https://github.com/boostorg/serialization/blob/1b9dc31ba/inc > lude/boost/serialization/array.hpp > > If you obtained the Boost library from an SDK vendor instead of directly > from Boost, you should probably ask them why it is different. > > > > > > ---------- Forwarded message ---------- > From: "deneme.true" <deneme.true(a)gmail.com> > To: boost-users(a)lists.boost.org > Cc: > Date: Thu, 4 Aug 2016 10:40:22 +0300 > Subject: [Boost-users] Serialization error > Hello, > > I got following errors on 64 bit machine when I try to compile my > application. > > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: __cdecl boost::archive::text_iarchive_impl<class > boost::archive::text_iarchive>::text_iarchive_impl<class > boost::archive::text_iarchive>(class std::basic_istream<char,struct > std::char_traits<char> > &,unsigned int)" > (??0?$text_iarchive_impl@Vtext_iarchive@archive@boost@@@archive@boost > @@IEAA@AEAV?$basic_istream@DU?$char_traits@D@std@@@std@@I@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: void __cdecl boost::archive::text_iarchive_impl<class > boost::archive::text_iarchive>::load_override(struct > boost::archive::class_name_type &)" > (?load_override@?$text_iarchive_impl@Vtext_iarchive@archive@boost > @@@archive@boost@@IEAAXAEAUclass_name_type@23@@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: void __cdecl boost::archive::text_iarchive_impl<class > boost::archive::text_iarchive>::load(class > std::basic_string<char,struct std::char_traits<char>,class > std::allocator<char> > &)" > (?load@?$text_iarchive_impl@Vtext_iarchive@archive@boost@@@archive@boost > @@IEAAXAEAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@ > Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: __cdecl boost::archive::basic_text_iprimitive<class > std::basic_istream<char,struct std::char_traits<char> > > >::~basic_text_iprimitive<class std::basic_istream<char,struct > std::char_traits<char> > >(void)" > (??1?$basic_text_iprimitive@V?$basic_istream@DU?$char_traits@D@std@@@std@ > @@archive@boost@@IEAA@XZ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: __cdecl boost::archive::basic_text_oprimitive<class > std::basic_ostream<char,struct std::char_traits<char> > > >::~basic_text_oprimitive<class std::basic_ostream<char,struct > std::char_traits<char> > >(void)" > (??1?$basic_text_oprimitive@V?$basic_ostream@DU?$char_traits@D@std@@@std@ > @@archive@boost@@IEAA@XZ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: __cdecl boost::archive::text_oarchive_impl<class > boost::archive::text_oarchive>::text_oarchive_impl<class > boost::archive::text_oarchive>(class std::basic_ostream<char,struct > std::char_traits<char> > &,unsigned int)" > (??0?$text_oarchive_impl@Vtext_oarchive@archive@boost@@@archive@boost > @@IEAA@AEAV?$basic_ostream@DU?$char_traits@D@std@@@std@@I@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: void __cdecl boost::archive::text_oarchive_impl<class > boost::archive::text_oarchive>::save(class > std::basic_string<char,struct std::char_traits<char>,class > std::allocator<char> > const &)" > (?save@?$text_oarchive_impl@Vtext_oarchive@archive@boost@@@archive@boost > @@IEAAXAEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@ > Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: virtual __cdecl > boost::archive::detail::basic_iserializer::~basic_iserializer(void)" > (??1basic_iserializer@detail@archive@boost@@MEAA@XZ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: __cdecl > boost::archive::detail::basic_iserializer::basic_iserializer(class > boost::serialization::extended_type_info const &)" > (??0basic_iserializer@detail@archive@boost@@IEAA@AEBVextended_type_info@ > serialization@3@@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: virtual __cdecl > boost::archive::detail::basic_oserializer::~basic_oserializer(void)" > (??1basic_oserializer@detail@archive@boost@@MEAA@XZ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: __cdecl > boost::archive::detail::basic_oserializer::basic_oserializer(class > boost::serialization::extended_type_info const &)" > (??0basic_oserializer@detail@archive@boost@@IEAA@AEBVextended_type_info@ > serialization@3@@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "public: void __cdecl > boost::archive::detail::basic_iarchive::reset_object_address(void > const *,void const *)" > (?reset_object_address@basic_iarchive@detail@archive@boost@@QEAAXPEBX0@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "public: class boost::archive::library_version_type __cdecl > boost::archive::detail::basic_iarchive::get_library_version(void)const > " (?get_library_version@basic_iarchive@detail@archive@boost@ > @QEBA?AVlibrary_version_type@34@XZ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "public: void __cdecl > boost::archive::detail::basic_iarchive::load_object(void *,class > boost::archive::detail::basic_iserializer const &)" > (?load_object@basic_iarchive@detail@archive@boost@@QEAAXPEAXAEBVbasic_ > iserializer@234@@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "public: virtual __cdecl > boost::archive::detail::basic_iarchive::~basic_iarchive(void)" > (??1basic_iarchive@detail@archive@boost@@UEAA@XZ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "public: void __cdecl > boost::archive::detail::basic_oarchive::end_preamble(void)" > (?end_preamble@basic_oarchive@detail@archive@boost@@QEAAXXZ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "public: void __cdecl > boost::archive::detail::basic_oarchive::save_object(void const *,class > boost::archive::detail::basic_oserializer const &)" > (?save_object@basic_oarchive@detail@archive@boost@@QEAAXPEBXAEBVbasic_ > oserializer@234@@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: virtual __cdecl > boost::archive::detail::basic_oarchive::~basic_oarchive(void)" > (??1basic_oarchive@detail@archive@boost@@MEAA@XZ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: void __cdecl boost::archive::basic_text_oarchive<class > boost::archive::text_oarchive>::newtoken(void)" > (?newtoken@?$basic_text_oarchive@Vtext_oarchive@archive@boost > @@@archive@boost@@IEAAXXZ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "public: virtual __cdecl > boost::archive::archive_exception::~archive_exception(void)" > (??1archive_exception@archive@boost@@UEAA@XZ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "public: __cdecl > boost::archive::archive_exception::archive_exception(enum > boost::archive::archive_exception::_exception_code,char const *,char > const *)" (??0archive_exception@archive@boost@@QEAA@W4_exception_code@ > 012@PEBD1@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "public: __cdecl > boost::archive::archive_exception::archive_exception(class > boost::archive::archive_exception const &)" > (??0archive_exception@archive@boost@@QEAA@AEBV012@@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "public: virtual bool __cdecl > boost::serialization::typeid_system::extended_type_info_ > typeid_0::is_equal(class > boost::serialization::extended_type_info const &)const " > (?is_equal@extended_type_info_typeid_0@typeid_system@serialization@boost > @@UEBA_NAEBVextended_type_info@34@@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "public: virtual bool __cdecl > boost::serialization::typeid_system::extended_type_info_ > typeid_0::is_less_than(class > boost::serialization::extended_type_info const &)const " > (?is_less_than@extended_type_info_typeid_0@typeid_system@ > serialization@boost@@UEBA_NAEBVextended_type_info@34@@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: void __cdecl > boost::serialization::typeid_system::extended_type_info_ > typeid_0::type_unregister(void)" > (?type_unregister@extended_type_info_typeid_0@typeid_system@serialization > @boost@@IEAAXXZ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: void __cdecl > boost::serialization::typeid_system::extended_type_info_ > typeid_0::type_register(class > type_info const &)" > (?type_register@extended_type_info_typeid_0@typeid_system@ > serialization@boost@@IEAAXAEBVtype_info@@@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: virtual __cdecl > boost::serialization::typeid_system::extended_type_info_ > typeid_0::~extended_type_info_typeid_0(void)" > (??1extended_type_info_typeid_0@typeid_system@serialization@boost@@MEAA@XZ > ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: __cdecl > boost::serialization::typeid_system::extended_type_info_ > typeid_0::extended_type_info_typeid_0(char > const *)" (??0extended_type_info_typeid_0@typeid_system@serialization@ > boost@@IEAA@PEBD@Z) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: void __cdecl > boost::serialization::extended_type_info::key_register(void)const " > (?key_register@extended_type_info@serialization@boost@@IEBAXXZ) > 1>wxRememberme.obj : error LNK2001: unresolved external symbol > "protected: void __cdecl > boost::serialization::extended_type_info::key_unregister(void)const " > (?key_unregister@extended_type_info@serialization@boost@@IEBAXXZ) > 1>libeay32mt.lib(txt_db.obj) : error LNK2001: unresolved external > symbol __iob_func > 1>libeay32mt.lib(ui_openssl.obj) : error LNK2001: unresolved external > symbol __iob_func > 1>ssleay32mt.lib(s3_srvr.obj) : error LNK2001: unresolved external > symbol __iob_func > 1>ssleay32mt.lib(t1_enc.obj) : error LNK2001: unresolved external > symbol __iob_func > 1>ssleay32mt.lib(d1_both.obj) : error LNK2001: unresolved external > symbol __iob_func > 1>libeay32mt.lib(cryptlib.obj) : error LNK2001: unresolved external > symbol __iob_func > 1>libeay32mt.lib(pem_lib.obj) : error LNK2001: unresolved external > symbol __iob_func > 1>libeay32mt.lib(e_capi.obj) : error LNK2001: unresolved external > symbol __iob_func > 1>libeay32mt.lib(gost_eng.obj) : error LNK2001: unresolved external > symbol __iob_func > 1>libeay32mt.lib(cryptlib.obj) : error LNK2001: unresolved external > symbol _vsnwprintf > > My boost library compile parameter is: > > C:\boost_1_61_0>b2 install --prefix=C:\Boost1_61_0 address-model=64 > --build-dir= > C:\boost-build toolset=msvc-14.0 variant=debug,release link=static > threading=mul > ti runtime-link=static stage > > I am using serialization. > > Thanks in advance > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

1 0

Re: [Boost-users] boost::serialization::array for Orocos RTT
by Sambeet Panigrahi 05 Aug '16

05 Aug '16

Sir, I gave the following includes #include <boost/serialization/array.hpp> #include <boost/array.hpp> I know boost::array exists,but does boost::serialization::array exist?Because in the namespace serialization in the boost/serialization/array.hpp, I could not find such a template. namespace boost { namespace serialization { // traits to specify whether to use an optimized array serialization template <class Archive> struct use_array_optimization : boost::mpl::always<boost::mpl::false_> {}; template<class T> class array_wrapper : public wrapper_traits<const array_wrapper< T > > { private: array_wrapper & operator=(const array_wrapper & rhs); public: // note: I would like to make the copy constructor private but this breaks // make_array. So I try to make make_array a friend - but that doesn't // build. Need a C++ guru to explain this! template<class S> friend const boost::serialization::array_wrapper<T> make_array( T* t, S s); array_wrapper(const array_wrapper & rhs) : m_t(rhs.m_t), m_element_count(rhs.m_element_count) {} public: array_wrapper(T * t, std::size_t s) : m_t(t), m_element_count(s) {} // default implementation template<class Archive> void serialize_optimized(Archive &ar, const unsigned int, mpl::false_ ) const { // default implemention does the loop std::size_t c = count(); T * t = address(); while(0 < c--) ar & boost::serialization::make_nvp("item", *t++); } // optimized implementation template<class Archive> void serialize_optimized(Archive &ar, const unsigned int version, mpl::true_ ) { boost::serialization::split_member(ar, *this, version); } // default implementation template<class Archive> void save(Archive &ar, const unsigned int version) const { ar.save_array(*this,version); } // default implementation template<class Archive> void load(Archive &ar, const unsigned int version) { ar.load_array(*this,version); } // default implementation template<class Archive> void serialize(Archive &ar, const unsigned int version) { typedef typename boost::serialization::use_array_optimization<Archive>::template apply< typename remove_const< T >::type >::type use_optimized; serialize_optimized(ar,version,use_optimized()); } T * address() const { return m_t; } std::size_t count() const { return m_element_count; } private: T * const m_t; const std::size_t m_element_count; }; template<class T, class S> inline const array_wrapper< T > make_array( T* t, S s){ const array_wrapper< T > a(t, s); return a; } } } // end namespace boost::serialization // I can't figure out why BOOST_NO_CXX11_HDR_ARRAY // has been set for clang-11. So just make sure // it's reset now. Needs further research!!! #if defined(_LIBCPP_VERSION) #undef BOOST_NO_CXX11_HDR_ARRAY #endif #ifndef BOOST_NO_CXX11_HDR_ARRAY #include <array> namespace boost { namespace serialization { // implement serialization for std::array template <class Archive, class T, std::size_t N> void serialize(Archive& ar, std::array<T,N>& a, const unsigned int /* version */) { ar & boost::serialization::make_nvp( "elems", *static_cast<T (*)[N]>(static_cast<void *>(a.data())) ); } } } // end namespace boost::serialization #endif

2 2

Serialization error
by deneme.true 04 Aug '16

04 Aug '16

Hello, I got following errors on 64 bit machine when I try to compile my application. 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: __cdecl boost::archive::text_iarchive_impl<class boost::archive::text_iarchive>::text_iarchive_impl<class boost::archive::text_iarchive>(class std::basic_istream<char,struct std::char_traits<char> > &,unsigned int)" (??0?$text_iarchive_impl@Vtext_iarchive@archive@boost@@@archive@boost@@IEAA@AEAV?$basic_istream@DU?$char_traits@D@std@@@std@@I@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: void __cdecl boost::archive::text_iarchive_impl<class boost::archive::text_iarchive>::load_override(struct boost::archive::class_name_type &)" (?load_override@?$text_iarchive_impl@Vtext_iarchive@archive@boost@@@archive@boost@@IEAAXAEAUclass_name_type@23@@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: void __cdecl boost::archive::text_iarchive_impl<class boost::archive::text_iarchive>::load(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)" (?load@?$text_iarchive_impl@Vtext_iarchive@archive@boost@@@archive@boost@@IEAAXAEAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: __cdecl boost::archive::basic_text_iprimitive<class std::basic_istream<char,struct std::char_traits<char> > >::~basic_text_iprimitive<class std::basic_istream<char,struct std::char_traits<char> > >(void)" (??1?$basic_text_iprimitive@V?$basic_istream@DU?$char_traits@D@std@@@std@@@archive@boost@@IEAA@XZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: __cdecl boost::archive::basic_text_oprimitive<class std::basic_ostream<char,struct std::char_traits<char> > >::~basic_text_oprimitive<class std::basic_ostream<char,struct std::char_traits<char> > >(void)" (??1?$basic_text_oprimitive@V?$basic_ostream@DU?$char_traits@D@std@@@std@@@archive@boost@@IEAA@XZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: __cdecl boost::archive::text_oarchive_impl<class boost::archive::text_oarchive>::text_oarchive_impl<class boost::archive::text_oarchive>(class std::basic_ostream<char,struct std::char_traits<char> > &,unsigned int)" (??0?$text_oarchive_impl@Vtext_oarchive@archive@boost@@@archive@boost@@IEAA@AEAV?$basic_ostream@DU?$char_traits@D@std@@@std@@I@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: void __cdecl boost::archive::text_oarchive_impl<class boost::archive::text_oarchive>::save(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?save@?$text_oarchive_impl@Vtext_oarchive@archive@boost@@@archive@boost@@IEAAXAEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: virtual __cdecl boost::archive::detail::basic_iserializer::~basic_iserializer(void)" (??1basic_iserializer@detail@archive@boost@@MEAA@XZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: __cdecl boost::archive::detail::basic_iserializer::basic_iserializer(class boost::serialization::extended_type_info const &)" (??0basic_iserializer@detail@archive@boost@@IEAA@AEBVextended_type_info@serialization@3@@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: virtual __cdecl boost::archive::detail::basic_oserializer::~basic_oserializer(void)" (??1basic_oserializer@detail@archive@boost@@MEAA@XZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: __cdecl boost::archive::detail::basic_oserializer::basic_oserializer(class boost::serialization::extended_type_info const &)" (??0basic_oserializer@detail@archive@boost@@IEAA@AEBVextended_type_info@serialization@3@@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "public: void __cdecl boost::archive::detail::basic_iarchive::reset_object_address(void const *,void const *)" (?reset_object_address@basic_iarchive@detail@archive@boost@@QEAAXPEBX0@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "public: class boost::archive::library_version_type __cdecl boost::archive::detail::basic_iarchive::get_library_version(void)const " (?get_library_version@basic_iarchive@detail@archive@boost@@QEBA?AVlibrary_version_type@34@XZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "public: void __cdecl boost::archive::detail::basic_iarchive::load_object(void *,class boost::archive::detail::basic_iserializer const &)" (?load_object@basic_iarchive@detail@archive@boost@@QEAAXPEAXAEBVbasic_iserializer@234@@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "public: virtual __cdecl boost::archive::detail::basic_iarchive::~basic_iarchive(void)" (??1basic_iarchive@detail@archive@boost@@UEAA@XZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "public: void __cdecl boost::archive::detail::basic_oarchive::end_preamble(void)" (?end_preamble@basic_oarchive@detail@archive@boost@@QEAAXXZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "public: void __cdecl boost::archive::detail::basic_oarchive::save_object(void const *,class boost::archive::detail::basic_oserializer const &)" (?save_object@basic_oarchive@detail@archive@boost@@QEAAXPEBXAEBVbasic_oserializer@234@@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: virtual __cdecl boost::archive::detail::basic_oarchive::~basic_oarchive(void)" (??1basic_oarchive@detail@archive@boost@@MEAA@XZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: void __cdecl boost::archive::basic_text_oarchive<class boost::archive::text_oarchive>::newtoken(void)" (?newtoken@?$basic_text_oarchive@Vtext_oarchive@archive@boost@@@archive@boost@@IEAAXXZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "public: virtual __cdecl boost::archive::archive_exception::~archive_exception(void)" (??1archive_exception@archive@boost@@UEAA@XZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "public: __cdecl boost::archive::archive_exception::archive_exception(enum boost::archive::archive_exception::_exception_code,char const *,char const *)" (??0archive_exception@archive@boost@@QEAA@W4_exception_code@012@PEBD1@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "public: __cdecl boost::archive::archive_exception::archive_exception(class boost::archive::archive_exception const &)" (??0archive_exception@archive@boost@@QEAA@AEBV012@@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "public: virtual bool __cdecl boost::serialization::typeid_system::extended_type_info_typeid_0::is_equal(class boost::serialization::extended_type_info const &)const " (?is_equal@extended_type_info_typeid_0@typeid_system@serialization@boost@@UEBA_NAEBVextended_type_info@34@@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "public: virtual bool __cdecl boost::serialization::typeid_system::extended_type_info_typeid_0::is_less_than(class boost::serialization::extended_type_info const &)const " (?is_less_than@extended_type_info_typeid_0@typeid_system@serialization@boost@@UEBA_NAEBVextended_type_info@34@@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: void __cdecl boost::serialization::typeid_system::extended_type_info_typeid_0::type_unregister(void)" (?type_unregister@extended_type_info_typeid_0@typeid_system@serialization@boost@@IEAAXXZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: void __cdecl boost::serialization::typeid_system::extended_type_info_typeid_0::type_register(class type_info const &)" (?type_register@extended_type_info_typeid_0@typeid_system@serialization@boost@@IEAAXAEBVtype_info@@@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: virtual __cdecl boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0(void)" (??1extended_type_info_typeid_0@typeid_system@serialization@boost@@MEAA@XZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: __cdecl boost::serialization::typeid_system::extended_type_info_typeid_0::extended_type_info_typeid_0(char const *)" (??0extended_type_info_typeid_0@typeid_system@serialization@boost@@IEAA@PEBD@Z) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: void __cdecl boost::serialization::extended_type_info::key_register(void)const " (?key_register@extended_type_info@serialization@boost@@IEBAXXZ) 1>wxRememberme.obj : error LNK2001: unresolved external symbol "protected: void __cdecl boost::serialization::extended_type_info::key_unregister(void)const " (?key_unregister@extended_type_info@serialization@boost@@IEBAXXZ) 1>libeay32mt.lib(txt_db.obj) : error LNK2001: unresolved external symbol __iob_func 1>libeay32mt.lib(ui_openssl.obj) : error LNK2001: unresolved external symbol __iob_func 1>ssleay32mt.lib(s3_srvr.obj) : error LNK2001: unresolved external symbol __iob_func 1>ssleay32mt.lib(t1_enc.obj) : error LNK2001: unresolved external symbol __iob_func 1>ssleay32mt.lib(d1_both.obj) : error LNK2001: unresolved external symbol __iob_func 1>libeay32mt.lib(cryptlib.obj) : error LNK2001: unresolved external symbol __iob_func 1>libeay32mt.lib(pem_lib.obj) : error LNK2001: unresolved external symbol __iob_func 1>libeay32mt.lib(e_capi.obj) : error LNK2001: unresolved external symbol __iob_func 1>libeay32mt.lib(gost_eng.obj) : error LNK2001: unresolved external symbol __iob_func 1>libeay32mt.lib(cryptlib.obj) : error LNK2001: unresolved external symbol _vsnwprintf My boost library compile parameter is: C:\boost_1_61_0>b2 install --prefix=C:\Boost1_61_0 address-model=64 --build-dir= C:\boost-build toolset=msvc-14.0 variant=debug,release link=static threading=mul ti runtime-link=static stage I am using serialization. Thanks in advance

1 0

Re: [Boost-users] multiprecision modf
by Daniel Brake 03 Aug '16

03 Aug '16

Paul, Boost, Thanks for the quick reply! I haven’t looked into this in detail, but I think not, > but Boost.Math does > > #include <boost/math/special_functions/modf.hpp> > > You might also need to add this to your local function(s) to aid Argument > Dependant Lookup (ADL). > > BOOST_MATH_STD_USING Boost.Math and the BOOST_MATH_STD_USING solved the modf problem, so long as I include and using before including Karma. Since the compiler got past that, it generated a new error, related to log10, floor, and int comparison. I've had errors related to log10, floor, and ceil in the context of Eigen before. /u/ggael resolved them by explicit casting in certain places, see e.g. https://forum.kde.org/viewtopic.php?f=74&t=133404&p=359710#p359710 Here's the new error message: In file included from test/generating/mpfr_float.cpp:27: In file included from ./include/bertini2/io/generators.hpp:44: In file included from /usr/local/include/boost/spirit/include/karma.hpp:16: In file included from /usr/local/include/boost/spirit/home/karma.hpp:15: In file included from /usr/local/include/boost/spirit/home/karma/numeric.hpp:16: In file included from /usr/local/include/boost/spirit/home/karma/numeric/real.hpp:32: /usr/local/include/boost/spirit/home/karma/numeric/real_policies.hpp:263:39: error: incompatible operand types ('int' and 'typename enable_if_c<number_category<detail::expression<function, log10_funct<mpfr_float_backend<0, allocate_dynamic> >, number<mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, void, void> >::value == number_kind_floating_point, detail::expression<detail::function, detail::floor_funct<typename detail::backend_type<detail::expression<function, log10_funct<mpfr_float_backend<0, allocate_dynamic> >, number<mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, void, void> >::type>, detail::expression<function, log10_funct<mpfr_float_backend<0, allocate_dynamic> >, number<mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, void, void> > >::type' (aka 'boost::multiprecision::detail::expression<boost::multiprecision::detail::function, boost::multiprecision::detail::floor_funct<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic> >, boost::multiprecision::detail::expression<boost::multiprecision::detail::function, boost::multiprecision::detail::log10_funct<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic> >, boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, void, void>, void, void>')) (traits::test_zero(n) ? 0 : floor(log10(n))) + 1; ^ ~ ~~~~~~~~~~~~~~~ /usr/local/include/boost/spirit/home/karma/numeric/detail/real_utils.hpp:170:24: note: in instantiation of function template specialization 'boost::spirit::karma::real_policies<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >::fraction_part<boost::spirit::karma::detail::output_iterator<std::__1::back_insert_iterator<std::__1::basic_string<char> >, mpl_::int_<0>, boost::spirit::unused_type> >' requested here r = r && p.fraction_part(sink, long_frac_part, prec, precision); ^ /usr/local/include/boost/spirit/home/karma/numeric/real_policies.hpp:94:30: note: in instantiation of function template specialization 'boost::spirit::karma::real_inserter<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, bertini::generators::BertiniNumPolicy<mpfr_float>, boost::spirit::unused_type, boost::spirit::unused_type>::call_n<boost::spirit::karma::detail::output_iterator<std::__1::back_insert_iterator<std::__1::basic_string<char> >, mpl_::int_<0>, boost::spirit::unused_type>, boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >' requested here return Inserter::call_n(sink, n, p); ^ /usr/local/include/boost/spirit/home/karma/numeric/detail/real_utils.hpp:56:31: note: in instantiation of function template specialization 'boost::spirit::karma::real_policies<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >::call<boost::spirit::karma::real_inserter<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, bertini::generators::BertiniNumPolicy<mpfr_float>, boost::spirit::unused_type, boost::spirit::unused_type>, boost::spirit::karma::detail::output_iterator<std::__1::back_insert_iterator<std::__1::basic_string<char> >, mpl_::int_<0>, boost::spirit::unused_type>, bertini::generators::BertiniNumPolicy<mpfr_float> >' requested here return p.template call<real_inserter>(sink, n, p); ^ /usr/local/include/boost/spirit/home/karma/numeric/real.hpp:192:35: note: in instantiation of function template specialization 'boost::spirit::karma::real_inserter<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, bertini::generators::BertiniNumPolicy<mpfr_float>, boost::spirit::unused_type, boost::spirit::unused_type>::call<boost::spirit::karma::detail::output_iterator<std::__1::back_insert_iterator<std::__1::basic_string<char> >, mpl_::int_<0>, boost::spirit::unused_type>, boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >' requested here return inserter_type::call(sink, traits::extract_from<T>(attr, context), p_) && ^ /usr/local/include/boost/spirit/home/karma/generate.hpp:69:45: note: in instantiation of function template specialization 'boost::spirit::karma::any_real_generator<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, bertini::generators::BertiniNumPolicy<mpfr_float>, boost::spirit::unused_type, boost::spirit::unused_type>::generate<boost::spirit::karma::detail::output_iterator<std::__1::back_insert_iterator<std::__1::basic_string<char> >, mpl_::int_<0>, boost::spirit::unused_type>, boost::spirit::context<boost::fusion::cons<const boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> &, boost::fusion::nil_>, boost::spirit::locals<mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na> >, boost::spirit::unused_type, boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >' requested here return compile<karma::domain>(expr).generate(sink, context, unused, attr); ^ /usr/local/include/boost/spirit/home/karma/generate.hpp:91:23: note: in instantiation of function template specialization 'boost::spirit::karma::generate<std::__1::back_insert_iterator<std::__1::basic_string<char> >, mpl_::int_<0>, boost::spirit::karma::real_generator<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, bertini::generators::BertiniNumPolicy<mpfr_float> >, boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >' requested here return karma::generate(sink, expr, attr); ^ ./include/bertini2/io/generators.hpp:153:21: note: in instantiation of function template specialization 'boost::spirit::karma::generate<std::__1::back_insert_iterator<std::__1::basic_string<char> >, boost::spirit::karma::real_generator<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, bertini::generators::BertiniNumPolicy<mpfr_float> >, boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >' requested here return generate(sink, ^ test/generating/mpfr_float.cpp:53:47: note: in instantiation of function template specialization 'bertini::generators::Classic::generate<std::__1::back_insert_iterator<std::__1::basic_string<char> > >' requested here BOOST_CHECK(bertini::generators::Classic::generate(sink, z)); Any help with this one would be greatly appreciated. It feels beyond my diagnosis. It feels to me like I might should feed mpfr_float into Fusion to adapt it, so I can use the type directly with Karma. Here's the generator code so far: template <typename Num> struct BertiniNumPolicy : public karma::real_policies<Num> { // we want the numbers always to be in scientific format static int floatfield(Num n) { return std::ios_base::scientific; } static unsigned int precision(Num) { return std::numeric_limits<Num>::max_digits10; } }; template<> struct BertiniNumPolicy<mpfr_float> : public karma::real_policies<mpfr_float> { // we want the numbers always to be in scientific format static int floatfield(mpfr_float n) { return std::ios_base::scientific; } static unsigned int precision(mpfr_float const& x) { return x.precision(); } }; template<typename Num> using FullPrec = boost::spirit::karma::real_generator<Num, BertiniNumPolicy<Num> >; FullPrec<double> const full_prec_d = FullPrec<double>(); FullPrec<mpfr_float> const full_prec_mp = FullPrec<mpfr_float>(); template <typename OutputIterator> static bool generate(OutputIterator sink, mpfr_float const& c) { using boost::spirit::karma::generate; return generate(sink, // Begin grammar ( full_prec_mp ), // End grammar c // Data to output ); } As a last question, I am unsure about the use of the a function parameter in my specialization BertiniNumPolicy<mpfr_float>, particularly the precision(mpfr_float) function. In the documentation and examples I have seen for specializations, this function doesn't use the argument. Is it ok that it does, that it checks the actual precision of x??? See above code. An alternate method for me might be to just use the str() method provided by the number<...> from Multiprecision, but it seems like since this type is numeric, I'd like to be able to generate using the numeric generators from Karma. Thanks again! Daniel Brake > ---------- Forwarded message ---------- > From: "Paul A. Bristow" <pbristow(a)hetp.u-net.com> > To: <boost-users(a)lists.boost.org> > Cc: > Date: Wed, 3 Aug 2016 10:00:20 +0100 > Subject: Re: [Boost-users] multiprecision modf > > I haven’t looked into this in detail, but I think not, > > > > but Boost.Math does > > > > #include <boost/math/special_functions/modf.hpp> > > > > You might also need to add this to your local function(s) to aid Argument > Dependant Lookup (ADL). > > > > BOOST_MATH_STD_USING > > > > > http://www.boost.org/doc/libs/1_61_0/libs/math/doc/html/math_toolkit/config… > > > > *Table 11. Boost.Math Macros* > > > > “Provides using statements for many std:: (abs to sqrt) and boost::math > (rounds, modf) functions. This allows these functions to be called > unqualified so that ifargument-dependent Argument Dependent Lookup > <http://en.wikipedia.org/wiki/Argument-dependent_name_lookup> fails to > find a suitable overload, then the std:: versions will also be considered.” > > > > HTH > > > > Paul >

2 1

multiprecision modf
by Daniel Brake 03 Aug '16

03 Aug '16

Hi Boost, Does Boost.Multiprecision provide modf for floating point types? I need it for generating with Karma, unless the fact that mpfr_float with variable precision not having numeric_traits might get in the way. Thanks for any help. Error message follows. In file included from test/generating/mpfr_float.cpp:27: In file included from ./include/bertini2/io/generators.hpp:38: In file included from /usr/local/include/boost/spirit/include/karma.hpp:16: In file included from /usr/local/include/boost/spirit/home/karma.hpp:15: In file included from /usr/local/include/boost/spirit/home/karma/numeric.hpp:16: In file included from /usr/local/include/boost/spirit/home/karma/numeric/real.hpp:32: In file included from /usr/local/include/boost/spirit/home/karma/numeric/real_policies.hpp:21: /usr/local/include/boost/spirit/home/karma/numeric/detail/real_utils.hpp:115:33: error: no matching function for call to 'modf' U fractional_part = modf(n, &integer_part); ^~~~ /usr/local/include/boost/spirit/home/karma/numeric/real_policies.hpp:94:30: note: in instantiation of function template specialization 'boost::spirit::karma::real_inserter<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, bertini::generators::BertiniNumPolicy<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >, boost::spirit::unused_type, boost::spirit::unused_type>::call_n<boost::spirit::karma::detail::output_iterator<std::__1::back_insert_iterator<std::__1::basic_string<char> >, mpl_::int_<0>, boost::spirit::unused_type>, boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >' requested here return Inserter::call_n(sink, n, p); ^ /usr/local/include/boost/spirit/home/karma/numeric/detail/real_utils.hpp:56:31: note: in instantiation of function template specialization 'boost::spirit::karma::real_policies<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >::call<boost::spirit::karma::real_inserter<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, bertini::generators::BertiniNumPolicy<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >, boost::spirit::unused_type, boost::spirit::unused_type>, boost::spirit::karma::detail::output_iterator<std::__1::back_insert_iterator<std::__1::basic_string<char> >, mpl_::int_<0>, boost::spirit::unused_type>, bertini::generators::BertiniNumPolicy<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> > >' requested here return p.template call<real_inserter>(sink, n, p); ^ /usr/local/include/boost/spirit/home/karma/numeric/real.hpp:192:35: note: in instantiation of function template specialization 'boost::spirit::karma::real_inserter<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, bertini::generators::BertiniNumPolicy<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >, boost::spirit::unused_type, boost::spirit::unused_type>::call<boost::spirit::karma::detail::output_iterator<std::__1::back_insert_iterator<std::__1::basic_string<char> >, mpl_::int_<0>, boost::spirit::unused_type>, boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >' requested here return inserter_type::call(sink, traits::extract_from<T>(attr, context), p_) && ^ /usr/local/include/boost/spirit/home/karma/generate.hpp:69:45: note: in instantiation of function template specialization 'boost::spirit::karma::any_real_generator<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, bertini::generators::BertiniNumPolicy<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >, boost::spirit::unused_type, boost::spirit::unused_type>::generate<boost::spirit::karma::detail::output_iterator<std::__1::back_insert_iterator<std::__1::basic_string<char> >, mpl_::int_<0>, boost::spirit::unused_type>, boost::spirit::context<boost::fusion::cons<const boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> &, boost::fusion::nil_>, boost::spirit::locals<mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na> >, boost::spirit::unused_type, boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >' requested here return compile<karma::domain>(expr).generate(sink, context, unused, attr); ^ /usr/local/include/boost/spirit/home/karma/generate.hpp:91:23: note: in instantiation of function template specialization 'boost::spirit::karma::generate<std::__1::back_insert_iterator<std::__1::basic_string<char> >, mpl_::int_<0>, boost::spirit::karma::real_generator<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, bertini::generators::BertiniNumPolicy<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> > >, boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >' requested here return karma::generate(sink, expr, attr); ^ ./include/bertini2/io/generators.hpp:149:21: note: in instantiation of function template specialization 'boost::spirit::karma::generate<std::__1::back_insert_iterator<std::__1::basic_string<char> >, boost::spirit::karma::real_generator<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>, bertini::generators::BertiniNumPolicy<boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> > >, boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on> >' requested here return generate(sink, ^ test/generating/mpfr_float.cpp:53:47: note: in instantiation of function template specialization 'bertini::generators::Classic::generate<std::__1::back_insert_iterator<std::__1::basic_string<char> > >' requested here BOOST_CHECK(bertini::generators::Classic::generate(sink, z)); ^ /usr/include/math.h:407:15: note: candidate function not viable: no known conversion from 'boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>' to 'double' for 1st argument extern double modf(double, double *); ^ /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:940:46: note: candidate function not viable: no known conversion from 'boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>' to 'float' for 1st argument inline _LIBCPP_INLINE_VISIBILITY float modf(float __lcpp_x, float* __lcpp_y) _NOEXCEPT {return modff(__lcpp_x, __lcpp_y);} ^ /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:941:46: note: candidate function not viable: no known conversion from 'boost::multiprecision::number<boost::multiprecision::backends::mpfr_float_backend<0, allocate_dynamic>, boost::multiprecision::expression_template_option::et_on>' to 'long double' for 1st argument inline _LIBCPP_INLINE_VISIBILITY long double modf(long double __lcpp_x, long double* __lcpp_y) _NOEXCEPT {return modfl(__lcpp_x, __lcpp_y);} Daniel Brake

3 2

boost::serialization::array for Orocos RTT
by Sambeet Panigrahi 02 Aug '16

02 Aug '16

Sir, I work on Orocos Real Time toolkit.Thhe project uses a boost::serialization::array however in the boost 1.44 I use there is no such header.Can you please tell me whether this header is really a part of Boost now? If no what can I use instead of that? I am posting the relevant build errors from RTT for a clearer idea: In file included from /home/sambeet/rtt-master/rtt/internal/DataSourceTypeInfo.hpp:44:0, from /home/sambeet/rtt-master/rtt/internal/DataSource.inl:5, from /home/sambeet/rtt-master/rtt/internal/DataSource.hpp:237, from /home/sambeet/rtt-master/rtt/OperationInterface.hpp:48, from /home/sambeet/rtt-master/rtt/OperationInterface.cpp:39: /home/sambeet/rtt-master/rtt/internal/../types/carray.hpp:99:48: error: expected ‘)’ before ‘<’ token carray( boost::serialization::array<T> const& orig) ^ /home/sambeet/rtt-master/rtt/internal/../types/carray.hpp:165:41: error: ‘array’ is not a member of ‘boost::serialization’ const carray<T>& operator=( boost::serialization::array<OtherT> const& orig ) { ^ /home/sambeet/rtt-master/rtt/internal/../types/carray.hpp:165:41: note: suggested alternative: In file included from /usr/include/boost/serialization/array.hpp:151:0, from /home/sambeet/rtt-master/rtt/internal/../types/carray.hpp:42, from /home/sambeet/rtt-master/rtt/internal/DataSourceTypeInfo.hpp:44, from /home/sambeet/rtt-master/rtt/internal/DataSource.inl:5, from /home/sambeet/rtt-master/rtt/internal/DataSource.hpp:237, from /home/sambeet/rtt-master/rtt/OperationInterface.hpp:48, from /home/sambeet/rtt-master/rtt/OperationInterface.cpp:39: /usr/include/boost/array.hpp:60:11: note: ‘boost::array’ class array { ^ In file included from /home/sambeet/rtt-master/rtt/internal/DataSourceTypeInfo.hpp:44:0, from /home/sambeet/rtt-master/rtt/internal/DataSource.inl:5, from /home/sambeet/rtt-master/rtt/internal/DataSource.hpp:237, from /home/sambeet/rtt-master/rtt/OperationInterface.hpp:48, from /home/sambeet/rtt-master/rtt/OperationInterface.cpp:39: /home/sambeet/rtt-master/rtt/internal/../types/carray.hpp:165:75: error: expected primary-expression before ‘>’ token const carray<T>& operator=( boost::serialization::array<OtherT> const& orig ) { ^ /home/sambeet/rtt-master/rtt/internal/../types/carray.hpp:165:77: error: expected primary-expression before ‘const’ const carray<T>& operator=( boost::serialization::array<OtherT> const& orig ) { ^ /home/sambeet/rtt-master/rtt/internal/../types/carray.hpp:165:89: error: declaration of ‘operator=’ as non-function const carray<T>& operator=( boost::serialization::array<OtherT> const& orig ) { ^ make[2]: *** [rtt/CMakeFiles/orocos-rtt-gnulinux_dynamic.dir/OperationInterface.cpp.o] Error 1 make[1]: *** [rtt/CMakeFiles/orocos-rtt-gnulinux_dynamic.dir/all] Error 2 make: *** [all] Error 2 Regards Sambeet

2 1

Windows installation issues
by Alexander Carôt 01 Aug '16

01 Aug '16

Hi all, after having switched from OSX and Linux to Windows 10 I have issues compiling boost (1.61)with the MinGW compiler. The very first step fails: bootstrap.bat mingw results in not finding a right path, denying access and aborting the installation. So far I only found this article: https://andres.jaimes.net/698/use-c-with-mingw-and-netbeans-in-windows/ but it does not contain further info how (and where) to add additional info (I added c:\MinGW\bin to my PATH but it didn’t help). Any help appreciated, thanks in advance Alex --

6 8

Python TypeError with application compiled with CXX11_ABI=0
by Jackson Wiegman 29 Jul '16

29 Jul '16

Hi, I have an application I am trying to compile on Ubuntu 16.04. This is using GCC 5.4.0 and libboost 1.58.0 (stock libraries). The application has a linking to a library that was built with GCC 4.*, so I have to compile with D_GLIBCXX_USE_CXX11_ABI=0 to get backwards comparability (otherwise I have undefined abi:cxx11 links). However when I do this, I get a TypeError in Python: TypeError: No registered converter was able to produce a C++ rvalue of type > std::string from this Python object of type str It looks like boost is having a problem working without the ABI. Does anyone have a work-around or a patch for this? Jackson

2 2

[Python] gcc error compiling boost
by Àlex Jarauta 29 Jul '16

29 Jul '16

Dear all, my name is Alex and I am a postdoc at the University of Alberta, Edmonton, Canada. I am working with an in-house opensource code that uses boost to wrap C++ code with Python. In the latest version of our code, one has to download boost manually and compile it. I have tried wot two different versions (1.59 and 1.60) and I can compile them with python 2.7. However, if I try to compile it using either Python 3.3 or 3.5, I always get the same error: "./boost/python/detail/wrap_python.hpp:50:23: fatal error: pyconfig.h: No such file or directory # include <pyconfig.h>" I have been looking for this error for a while, but I have not been able to find a proper solution. I wonder if you could help me on this matter. Thank you very much for your attention. Best regards, Àlex

2 1

Graph: Trying to filter on custom properties
by Amit Prakash Ambasta 29 Jul '16

29 Jul '16

How should I be writing the get_filtered_graph in a generic way? #include <map> #include <string> #include <vector> #include <iostream> #include <boost/graph/adjacency_list.hpp> #include <boost/property_map/property_map.hpp> #include <boost/graph/filtered_graph.hpp> #include <boost/graph/graph_utility.hpp> template <typename F> struct EdgeProperty { F features; EdgeProperty() = default; EdgeProperty(const F& f) : features(f) {} }; template <typename EM, typename F> struct filtered_edge { F filters; EM emap; filtered_edge() = default; filtered_edge(EM emap_, F filters_) : emap(emap_), filters(filters_) {} template <typename E> bool operator()(const E& e) { auto e_prop = get(emap, e); auto e_feat = e_prop.features; for (auto it: e_feat) { if (get(e_feat, it.first) != it.second) { return false; } } return true; } }; template<typename G, typename F> G get_filtered_graph(G& g, F& filters) { typedef filtered_edge<boost::property_map<G, EdgeProperty<F> >, F> filter_fn; filter_fn filter{get(&EdgeProperty<F>::features, g), filters}; boost::filtered_graph<G, filter_fn> fg(g, filter); return fg; } typedef std::map<std::string, int> dict; typedef boost::adjacency_list< boost::vecS, boost::vecS, boost::directedS, boost::no_property, EdgeProperty<dict> > Graph; Graph create_empty_graph() noexcept { return {}; } int main() { const char* name = "ABCDE"; auto g = create_empty_graph(); auto v0 = boost::add_vertex(g); auto v1 = boost::add_vertex(g); auto v2 = boost::add_vertex(g); dict d01; d01["a"] = 1; dict d12; d12["b"] = 1; dict fil; fil["a"] = 1; auto ep01 = EdgeProperty<dict>{ dict{} }; boost::add_edge(v0, v1, d01, g); boost::add_edge(v1, v2, d12, g); std::cout << "Before filter" << std::endl; boost::print_graph(g, name); auto fg = get_filtered_graph(g, fil); std::cout << "After filter" << std::endl; boost::print_graph(fg, name); Graph ga; }

2 2

[boost.geometry] concept namespace conflicts with new concept keyword (gcc 6.1)
by kique G 28 Jul '16

28 Jul '16

Hello, I am using boost.geometry with gcc 6.1 and I am finding conflicts between the new concept keyword (-fconcepts) and the concept namespace: /usr/include/boost/geometry/geometries/concepts/point_concept.hpp:33:50: error: expected identifier before 'concept' Am I missing something? If not, are there any plans for renaming this namespace? Do you know of any other incompatibilities between the boost libraries and the concepts TS? Thanks and best regards, Enrique Garcia

2 2

SVGMath no longer available
by Je suis la poubelle 27 Jul '16

27 Jul '16

Hi, I don't have any question to ask (yet :) ) but have a comment. In the folder "libs\math\doc\html\math_toolkit", there's the file sf_implementation.html. Inside this file, there's a section called "Creating and Managing the Equations". Inside it, you talked about a program called SVGMath (with a hyperlink). However, the hyperlink points to a website which no longer exists. Have a nice day

2 1

[boost.geometry] Why point coordinates are stored to SVG as integers?
by Mikhail Matrosov 27 Jul '16

27 Jul '16

Hello, I'm using boost::geometry::svg_mapper to save my shapes with floating point coordinates into an .svg file. It works great, but they are stored as integers. I can see this line in svg_mapper.hpp: namespace detail { namespace svg { typedef model::point<int, 2, cs::cartesian> svg_point_type; }} Thus svg_point is clearly defined to have integer coordinates. However, it is not convenient - SVG handles floating point coordinated perfectly well. Why not using original type of the serialized collection and let streams handle representation? ----- Best regards, Mikhail Matrosov

2 1

Re: [Boost-users] lockfree : getting a move only type into spsc_queue
by Bjorn Reese 24 Jul '16

24 Jul '16

On 07/23/2016 11:36 PM, Thomas Novotny wrote: > In the end Imade a custom version of spsc_queue. Getting this working > (as a hack) was fairly easy, so I wanted to share it in the hope that a > better solution might make it into a future version of the library. FYI, there is a pull request about adding move support to spsc_queue, but the consequences have not been fully examined yet: https://github.com/boostorg/lockfree/pull/24 In the meanwhile, you can make a cleaner solution with a unique_ptr specialization of spsc_queue. See attachment. > bool push( T & t, T * buffer, size_t max_size ) T&& t

2 1

lockfree : getting a move only type into spsc_queue
by Thomas Novotny 23 Jul '16

23 Jul '16

I had a unique_ptr from a pool with a custom deleter that I needed to get int a lockfree queue. This did not work out of the box with either boost::lockfree::queue or boost::lockfree::spsc_queue. There were three main issues: * default construction * copying * copy construction To solve the issue with default constructability I had to wrap the unique_ptr in a class. In the end Imade a custom version of spsc_queue. Getting this working (as a hack) was fairly easy, so I wanted to share it in the hope that a better solution might make it into a future version of the library. In essence, I only had to add some std::move calls and adjust the api for push. two lines here: bool push(T const & t, T * buffer, size_t max_size) { const size_t write_index = write_index_.load(memory_order_relaxed); // only written from push thread const size_t next = next_index(write_index, max_size); if (next == read_index_.load(memory_order_acquire)) return false; /* ringbuffer is full */ new (buffer + write_index) T(t); // copy-construct write_index_.store(next, memory_order_release); return true; } to bool push( T & t, T * buffer, size_t max_size ) { const size_t write_index = write_index_.load( memory_order_relaxed ); // only written from push thread const size_t next = next_index( write_index, max_size ); if( next == read_index_.load( memory_order_acquire ) ) return false; /* ringbuffer is full */ new (buffer + write_index) T(); // default-construct *(buffer + write_index) = std::move( t ); // move write_index_.store( next, memory_order_release ); return true; } a line here: bool push(T const & t) { return base_type::push(t); } to bool push(T & t) { return base_type::push(t); } and a few lines here template< class OutputIterator > OutputIterator copy_and_delete( T * first, T * last, OutputIterator out ) { if (boost::has_trivial_destructor<T>::value) { return std::copy(first, last, out); // will use memcpy if possible } else { for (; first != last; ++first, ++out) { *out = *first; first->~T(); } return out; } } to template< class OutputIterator > OutputIterator copy_and_delete( T * first, T * last, OutputIterator out ) { for (; first != last; ++first, ++out) { *out = std::move(*first); first->~T(); } return out; } In copy_payload there is only one change struct copy_convertible { template <typename T, typename U> static void copy(T & t, U & u) { u = t; } }; became template <typename T, typename U> static void copy(T & t, U & u) { u = std::move(t); } and that was it. The result is not pretty but works (only single element push and pop used).

1 0

Boost Social Event at CppCon 2016
by Jon Kalb 23 Jul '16

23 Jul '16

Boost Users, Because a lot of Boosters are going to be attending CppCon, we¹d like to arrange a social event for Boosters/C++Now attendees. http://cppcon.org/ If you are planning to attend CppCon or even If you are just going to be in or around Bellevue, Washington between September 17th and 23rd and you¹d like to join us for dinner, please let us know so we can get a count. Please send mail to: social(a)boost.org Once we settle on a date, etc, we¹ll let everyone who responded know when and where, so please let us know, even if you are a ³maybe.² If you are attending, please make your hotel reservations soon. We are likely to sell out of our room block. http://cppcon.org/lodging/ I hope to see you at CppCon. Jon

1 0

Problem using Boost 1.61.0 with VTK Marching Cubes
by PAUL SMITH 15 Jul '16

15 Jul '16

To whom it may concern, I asked this question to boost-bugs, but I was told not to expect a response from that email address and instead ask here. I seem to be having a problem using Boost 1.61.0 in conjunction with VTK 7.0.0. My purpose for using Boost is to obtain the filenames of all PNG files in any given folder using the following code: #define BOOST_FILESYSTEM_VERSION 3 #define BOOST_FILESYSTEM_NO_DEPRECATED #include "boost/filesystem.hpp" namespace fs = ::boost::filesystem; // return the filenames of all files that have the specified extension // in the specified directory and all subdirectories void get_all(const fs::path& root, const string& ext, vector<fs::path>&ret) { if(!fs::exists(root) || !fs::is_directory(root)) return; fs::recursive_directory_iterator it(root); fs::recursive_directory_iterator endit; while(it != endit) { if(fs::is_regular_file(*it) && it->path().extension() == ext) ret.push_back(it->path().filename()); ++it; } } This code is used as part of the CXX file, which is built with an appropriate CMakeLists file using CMake 3.5.1 to produce a corresponding .xcodeproj file. CXX and CMakeLists files are attached. However, the main problem that I'm facing is that attempting to build the project using an ALL_BUILD scheme in Xcode 7.0.1 leads to a series of errors pointing to the #include statements of the header files in the Boost folder (which is located in the same folder as the CXX and CMakeLists files). For instance, it starts off saying that "'boost/filesystem/config.hpp' file not found" in response to the following line of boost/filesystem.hpp: # include <boost/filesystem/config.hpp> Such errors could be resolved if I were to modify the syntax of the #include statements to follow a different format: # include "./filesystem/config.hpp" i.e., replacing the <> with "" and using relative paths to find the other required header files. However, going in to modify every single header file is a sort of tedium that I find it difficult to handle, and therefore I was hoping for a simpler solution to this problem. By the way, I am on a Mac, and my operating system is El Capitan version 10.11.5. Thank you in advance.

3 2

回复：Re: the performance of boost::lock_free is slow in centos 6 and 7
by gao1738＠sina.com 12 Jul '16

12 Jul '16

Thanks for the response! What I want to know are: 1. when I should use the boost::lock_free? 2. What is the main usage of boost::lock_free? Not for better performance? 3. what is the best practice for boost::lock_free? 4. why the better the machine is, the worse the performance for boost::lock_free? In my test 3, by using 32core machine, I test threads from 1 to 32. In all of the test cases, the boost::lock_free is much slower than mutex, why? Best regards, dennis ----- 原始邮件 ----- 发件人：james <dirtydroog(a)gmail.com> 收件人：boost-users(a)lists.boost.org 主题：Re: [Boost-users] the performance of boost::lock_free is slow in centos 6 and 7 日期：2016年07月08日 21点21分 I suspect the main issue with your test is the effects of false sharing being magnified when the number of cores is >= the number of threads. I'd also suggest using the mm_pause intrinsic when busy spinning if your CPU supports it. (It's a real shame there's no official spinlock class in C++) Also, use something like a countdown latch to make sure your threads all start the actual work at the same time. On Fri, Jul 8, 2016 at 1:50 PM, Michael <mwpowellhtx(a)gmail.com> wrote: On July 8, 2016 1:39:13 AM EDT, gao1738(a)sina.com wrote: > Hi all, > >I try the boost::lockfree::queue and find some performance issue： > >I use the following test programs: > >lock_free_test.cc > >#include <boost/thread/thread.hpp> >#include <boost/lockfree/queue.hpp> >#include <iostream> >#include<cstdio> > >#include <boost/atomic.hpp> > >boost::atomic_int producer_count(0); >boost::atomic_int consumer_count(0); > >boost::lockfree::queue<int> queue(128); > >const int iterations = 1000000; >const int producer_thread_count = 4; >const int consumer_thread_count = 4; > >void producer(void) >{ > for (int i = 0; i != iterations; ++i) { > int value = ++producer_count; > while (!queue.push(value)) > ; > } >} > >boost::atomic<bool> done (false); >void consumer(void) >{ > int value; > while (!done) { > while (queue.pop(value)) > ++consumer_count; > } > > while (queue.pop(value)) > ++consumer_count; >} > >int main(int argc, char* argv[]) >{ > using namespace std; > cout << "boost::lockfree::queue is "; > if (!queue.is_lock_free()) > cout << "not "; > cout << "lockfree" << endl; > > boost::thread_group producer_threads, consumer_threads;//线程组 > > for (int i = 0; i != producer_thread_count; ++i) > producer_threads.create_thread(producer); > > for (int i = 0; i != consumer_thread_count; ++i) > consumer_threads.create_thread(consumer); > > producer_threads.join_all(); > done = true; > > consumer_threads.join_all(); > > cout << "produced " << producer_count << " objects." << endl; > cout << "consumed " << consumer_count << " objects." << endl; >} > > >locktest.cc > >#include <boost/thread/thread.hpp> >#include <boost/lockfree/queue.hpp> >#include <iostream> >#include<cstdio> >#include <queue> > >#include <boost/atomic.hpp> >using namespace std; > >boost::mutex producer_count_mu; >boost::mutex consumer_count_mu; >int producer_count = 0; >int consumer_count = 0; > >std::queue<int> message_queue; > >boost::mutex queue_mutex; > >const int iterations = 1000000; >const int producer_thread_count = 4; >const int consumer_thread_count = 4; > >void producer(void) >{ > for (int i = 0; i != iterations; ++i) { > queue_mutex.lock(); > int value = ++producer_count; > message_queue.push(value); > queue_mutex.unlock(); > } >} I haven't used lockfree per se but my understanding is that it solves what its name says. My guess is that most of the time is spent contending for the mutex. Incidentally, why not use one of the proper lock classes? You are already using boost, so this is also there. That'll save you having to lock and unlock, at least. I haven't explored lockfree that much, I could be wrong, but I thought the whole point of running lockfree was to avoid expensive locks, but not absolving you of being aware of exhausted conditions when your queue was empty. Also, doing a test like this what are you really asserting? Lock free; not expense free. There are no free lunches. Less so ever before. Anyhow, HTH Regards, Michael Powell >bool done (false); >void consumer(void) >{ > int value; > while (!done) { > queue_mutex.lock(); > while (!message_queue.empty()) { > message_queue.pop(); > ++consumer_count; > } > queue_mutex.unlock(); > } > > queue_mutex.lock(); > while (!message_queue.empty()) { > message_queue.pop(); > ++consumer_count; > } > queue_mutex.unlock(); >} >int main(int argc, char* argv[]) >{ > using namespace std; > cout << "boost::lockfree::queue is "; >// if (!queue.is_lock_free()) > cout << "not "; > cout << "lockfree" << endl; > > boost::thread_group producer_threads, consumer_threads;//线程组 > > for (int i = 0; i != producer_thread_count; ++i) > producer_threads.create_thread(producer); > > for (int i = 0; i != consumer_thread_count; ++i) > consumer_threads.create_thread(consumer); > > producer_threads.join_all(); > done = true; > > consumer_threads.join_all(); > > cout << "produced " << producer_count << " objects." << endl; > cout << "consumed " << consumer_count << " objects." << endl; >} > > >The compile command is: >g++ -I/usr/local/inlcude -L/usr/local/lib lock_free_test.cc >-lboost_thread -lboost_system -o lock_free_test >g++ -I/usr/local/inlcude -L/usr/local/lib lock_test.cc -lboost_thread >-lboost_system -o lock_test > >1. I first test in on my work computer, which use ubuntu 14.04 with >2core(i5), with >boost version: 1.54 >gcc version: 4.8.4 >g++ version: 4.8.4 > >The test result is that: > >time ./lock_test > >boost::lockfree::queue is not lockfree > >produced 4000000 objects. > >consumed 4000000 objects. > > > >real 0m3.844s > >user 0m1.800s > >sys 0m12.308s > time ./lock_free_test > >boost::lockfree::queue is lockfree > >produced 4000000 objects. > >consumed 4000000 objects. > > > >real 0m1.745s > >user 0m6.886s > >sys 0m0.000s > > >We can see that the lock free solution has better performance, about >50%. > >2. then I test it in a PC server with centos 6.4 , and 8 core (CPU >Intel(R) Xeon(R) CPU E5-2650 0 @ 2.00GHz ) > >boost version: 1.54 >gcc version: 4.4.7 >g++ version:4.4.7 > >The test result is that: > >time ./lock_test >boost::lockfree::queue is not lockfree >produced 4000000 objects. >consumed 4000000 objects. > >real 0m3.900s >user 0m2.593s >sys 0m27.282s > > time ./lock_free_test >boost::lockfree::queue is lockfree >produced 4000000 objects. >consumed 4000000 objects. > >real 0m5.470s >user 0m43.105s >sys 0m0.000s > > >Non lock free solution is better than lock free solution. > >3. I test it in a better PC server with centos 7.1 and 32 core CPU >(Intel(R) Xeon(R) CPU E7-4820 v2 @ 2.00GHz) >boost version: 1.53 >gcc version: 4.8.3 >g++ version: 4.8.3 > >time ./lock_test >boost::lockfree::queue is not lockfree >produced 4000000 objects. >consumed 4000000 objects. > >real 0m3.023s >user 0m1.929s >sys 0m20.706s > >time ./lock_free_test >boost::lockfree::queue is lockfree >produced 4000000 objects. >consumed 4000000 objects. > >real 0m9.804s >user 1m14.900s >sys 0m0.100s > >The lock free solution will be 3 times lower than the non-lock free >solution! > > >My question is that: >1. why lock free solution will get better performance in ubuntu but >much slower in centos 6 and 7? > Is it the issue of kernal or the gcc version or the boost version? >The more cpu in the machine the worse performance for lock free >solution? > >2. In which case, we should use the boost lock free solution to get >better performance? > > > >Best Regards! > >dennis > > > > >------------------------------------------------------------------------ > >_______________________________________________ >Boost-users mailing list >Boost-users(a)lists.boost.org >http://lists.boost.org/mailman/listinfo.cgi/boost-users -- Sent from my Android device with K-9 Mail. Please excuse my brevity. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

3 2

[boost.test] Don't report skipped test as failure
by Florian Lindner 11 Jul '16

11 Jul '16

Hello, I use boost.test precondition in an MPI application to disable test at ranks != 0 if they do not use MPI: boost::test_tools::assertion_result isMaster(boost::unit_test::test_unit_id) { return precice::utils::Parallel::getProcessRank() == 0; } BOOST_AUTO_TEST_SUITE(NearestNeighborMapping) BOOST_AUTO_TEST_CASE(ConsistentNonIncremental, * boost::unit_test::precondition(isMaster)) {...} That works perfect, I just don't like that sipped test are reported as errors. Example with all tests deactivated: % ./testprecice Global setup Running 2 test cases... Global teardown *** Errors were detected in the test module "Master Test Suite"; see standard output for details Here you think it's an error, but it's just skipped tests: % ./testprecice -r detailed Global setup Running 2 test cases... Global teardown Test module "Master Test Suite" has failed with: 2 test cases out of 2 skipped Test suite "NearestNeighborMapping" has failed with: 2 test cases out of 2 skipped Test case "NearestNeighborMapping/ConsistentNonIncremental" was skipped Test case "NearestNeighborMapping/ConservativeNonIncremental" was skipped Could this behavior be changed somehow and skipped test not be reported as failures? Thanks, Florian

2 2

substantial lag time difference from boost::thread 1.57 and 1.60
by David Medine 09 Jul '16

09 Jul '16

Hello, I am an engineer in a neurosciences lab. We have some data acquisition software that uses boost::thread and some other boost libraries as well. Part of my job is to measure the lag time for our devices' data acquisition. I have been testing the acquisition software when linking against boost v.1.57.0 and v.160.0. Basically I generate a test signal and read it in with an NIDAQ and our EEG system. The signal is a series of 3ms long pulses. When the input to the NIDAQ goes high, I generate a timestamped marker. Meanwhile the EEG system is getting the same pulse train input and I record that digital data on its own thread and timestamp that as well. Then I compare the timestamps at which the EEG signal has a rising edge with the timestamps of the markers. The difference between these time values is the lag of the EEG system. The app I use to get the EEG signal uses boost::thread. The lag time is consistently ~2.7 ms when linking against boost v.1.57.0 and is a whopping 11.6 ms when I link against v.1.60.0. Since the data acquisition happens in a tight loop on its own thread, I am guessing that there is some kind of increased latency of boost threads in newer versions of the library. Does anybody know what might be causing this? I am on Windows 7, 64-bit and am using the pre-compiled boost libraries (i.e. I am not compiling them myself). Cheers, David

2 2

Acquiring and rebuilding C++ libraries on Windows
by Eric Mittelette 08 Jul '16

08 Jul '16

Hello I'm Program Manager at Microsoft, working on VC++ Libraries team (VC runtime, STL...) We are working on the spec of a tool to acquire 3rd party libraries on Windows. We are targeting mainly OSS libraries, our tool will help dev to rebuild locally from the source code on Windows. Today we have a proto, based on a port tree approach. (having a repo with the build script and the associated patch file) I wanted to have a discussion with the Boost community about this project, and how dev could acquire Boost this way. Feel free to contact me to initiate this discussion, we'll be happy to share our idea and prototype with you and collect feedback and suggestions. Best, Eric Mittelette Senior Program Manager - Visual C++ (VCLib) Microsoft Corp.

6 10

the performance of boost::lock_free is slow in centos 6 and 7
by gao1738＠sina.com 08 Jul '16

08 Jul '16

Hi all, I try the boost::lockfree::queue and find some performance issue： I use the following test programs: lock_free_test.cc #include <boost/thread/thread.hpp> #include <boost/lockfree/queue.hpp> #include <iostream> #include<cstdio> #include <boost/atomic.hpp> boost::atomic_int producer_count(0); boost::atomic_int consumer_count(0); boost::lockfree::queue<int> queue(128); const int iterations = 1000000; const int producer_thread_count = 4; const int consumer_thread_count = 4; void producer(void) { for (int i = 0; i != iterations; ++i) { int value = ++producer_count; while (!queue.push(value)) ; } } boost::atomic<bool> done (false); void consumer(void) { int value; while (!done) { while (queue.pop(value)) ++consumer_count; } while (queue.pop(value)) ++consumer_count; } int main(int argc, char* argv[]) { using namespace std; cout << "boost::lockfree::queue is "; if (!queue.is_lock_free()) cout << "not "; cout << "lockfree" << endl; boost::thread_group producer_threads, consumer_threads;//线程组 for (int i = 0; i != producer_thread_count; ++i) producer_threads.create_thread(producer); for (int i = 0; i != consumer_thread_count; ++i) consumer_threads.create_thread(consumer); producer_threads.join_all(); done = true; consumer_threads.join_all(); cout << "produced " << producer_count << " objects." << endl; cout << "consumed " << consumer_count << " objects." << endl; } locktest.cc #include <boost/thread/thread.hpp> #include <boost/lockfree/queue.hpp> #include <iostream> #include<cstdio> #include <queue> #include <boost/atomic.hpp> using namespace std; boost::mutex producer_count_mu; boost::mutex consumer_count_mu; int producer_count = 0; int consumer_count = 0; std::queue<int> message_queue; boost::mutex queue_mutex; const int iterations = 1000000; const int producer_thread_count = 4; const int consumer_thread_count = 4; void producer(void) { for (int i = 0; i != iterations; ++i) { queue_mutex.lock(); int value = ++producer_count; message_queue.push(value); queue_mutex.unlock(); } } bool done (false); void consumer(void) { int value; while (!done) { queue_mutex.lock(); while (!message_queue.empty()) { message_queue.pop(); ++consumer_count; } queue_mutex.unlock(); } queue_mutex.lock(); while (!message_queue.empty()) { message_queue.pop(); ++consumer_count; } queue_mutex.unlock(); } int main(int argc, char* argv[]) { using namespace std; cout << "boost::lockfree::queue is "; // if (!queue.is_lock_free()) cout << "not "; cout << "lockfree" << endl; boost::thread_group producer_threads, consumer_threads;//线程组 for (int i = 0; i != producer_thread_count; ++i) producer_threads.create_thread(producer); for (int i = 0; i != consumer_thread_count; ++i) consumer_threads.create_thread(consumer); producer_threads.join_all(); done = true; consumer_threads.join_all(); cout << "produced " << producer_count << " objects." << endl; cout << "consumed " << consumer_count << " objects." << endl; } The compile command is: g++ -I/usr/local/inlcude -L/usr/local/lib lock_free_test.cc -lboost_thread -lboost_system -o lock_free_test g++ -I/usr/local/inlcude -L/usr/local/lib lock_test.cc -lboost_thread -lboost_system -o lock_test 1. I first test in on my work computer, which use ubuntu 14.04 with 2core(i5), with boost version: 1.54 gcc version: 4.8.4 g++ version: 4.8.4 The test result is that: time ./lock_test boost::lockfree::queue is not lockfree produced 4000000 objects. consumed 4000000 objects. real 0m3.844s user 0m1.800s sys 0m12.308s time ./lock_free_test boost::lockfree::queue is lockfree produced 4000000 objects. consumed 4000000 objects. real 0m1.745s user 0m6.886s sys 0m0.000s We can see that the lock free solution has better performance, about 50%. 2. then I test it in a PC server with centos 6.4 , and 8 core (CPU Intel(R) Xeon(R) CPU E5-2650 0 @ 2.00GHz ) boost version: 1.54 gcc version: 4.4.7 g++ version:4.4.7 The test result is that: time ./lock_test boost::lockfree::queue is not lockfree produced 4000000 objects. consumed 4000000 objects. real 0m3.900s user 0m2.593s sys 0m27.282s time ./lock_free_test boost::lockfree::queue is lockfree produced 4000000 objects. consumed 4000000 objects. real 0m5.470s user 0m43.105s sys 0m0.000s Non lock free solution is better than lock free solution. 3. I test it in a better PC server with centos 7.1 and 32 core CPU (Intel(R) Xeon(R) CPU E7-4820 v2 @ 2.00GHz) boost version: 1.53 gcc version: 4.8.3 g++ version: 4.8.3 time ./lock_test boost::lockfree::queue is not lockfree produced 4000000 objects. consumed 4000000 objects. real 0m3.023s user 0m1.929s sys 0m20.706s time ./lock_free_test boost::lockfree::queue is lockfree produced 4000000 objects. consumed 4000000 objects. real 0m9.804s user 1m14.900s sys 0m0.100s The lock free solution will be 3 times lower than the non-lock free solution! My question is that: 1. why lock free solution will get better performance in ubuntu but much slower in centos 6 and 7? Is it the issue of kernal or the gcc version or the boost version? The more cpu in the machine the worse performance for lock free solution? 2. In which case, we should use the boost lock free solution to get better performance? Best Regards! dennis

3 2

BOOST_PP_SEQ_ENUM troubles
by Cherotek Music 08 Jul '16

08 Jul '16

Hi, I'm trying to make a macro chain that expands something like this *A, B, C* into something like this *{"A", create<AFile>}, {"B", create<BFile>}, {"C", create<CFile>}* This is what I have come up with *#define FORMATS A, B, C // Add new formats here* *#define SEQ_FORMATS BOOST_PP_VARIADIC_TO_SEQ(FORMATS)* *#define ARG_PAIR(s, data, x) {#x, create<x##File>}* *#define SEQ_ARG_PAIRS BOOST_PP_SEQ_TRANSFORM(ARG_PAIR, ~, SEQ_FORMATS)* *#define ARG_PAIRS BOOST_PP_SEQ_ENUM(SEQ_ARG_PAIRS)* The SEQ_ARG_PAIRS macro does expand into *({"A", create<AFile>}) ({"B", create<BFile>}) ({"C", create<CFile>})* but ARG_PAIRS fails with the following error: test.cpp:20:1: error: macro "BOOST_PP_SEQ_SIZE_0" passed 2 arguments, but takes just 1 ARG_PAIRS ^ BOOST_PP_SEQ_ENUM_0 ({"B", create<BFile>}) ({"C", create<CFile>}) ({"A", create<AFile>}) ({"B", create<BFile>}) ({"C", create<CFile>}) Any ideas? thanks a lot

3 7

boost::any with const value types
by Robert Dailey 07 Jul '16

07 Jul '16

I'm finding that if I store a `char*` versus `char const*` in a boost::any object, that this impacts the behavior of boost::any_cast. I do not find this documented anywhere. For example, if I store a const qualified character pointer in a boost::any object, then I do `boost::any_cast<char*>(......)`, it will throw. Changing the type to `char const*` fixes it. Is this by design? I find this makes things more difficult to deal with since I don't always know if the type I'm getting is const or not. Also my implementation does not change depending on constness.

4 3

State of context and coroutine
by Michael Steinberg 06 Jul '16

06 Jul '16

Hello, I find myself working on a project which makes use of boost::context functionality which got moved to the detail namespace somewhen before booost 1.61 . Now this project is mimicing something along the lines of boost::coroutine on top of context. I could try to adapt to the new intended usage of context or change the setup to use coroutine. Hence my question is whether the public coroutine interface, specifically the asymmetric parts, is stable yet? Im seeing 1's and 2's there side by side, so I could imagine there's still deciding on a good interface going on. Kind Regards, Michael

4 12

Re: [Boost-users] Acquiring and rebuilding C++ libraries on Windows
by LeMay.Steve 06 Jul '16

06 Jul '16

Probably a great topic for CPPCON. Sent from my iPad From: Ernest Zaslavsky Sent: 7/5/16, 8:44 PM To: , Boost Subject: Re: [Boost-users] Acquiring and rebuilding C++ libraries on Windows Hi, And what happened to the native NuGet packages idea? It is quite convenient way to get, use and update third parties. From: Boost-users [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Eric Mittelette Sent: Wednesday, July 06, 2016 2:49 AM To: boost-users(a)lists.boost.org Subject: [Boost-users] Acquiring and rebuilding C++ libraries on Windows Hello I’m Program Manager at Microsoft, working on VC++ Libraries team (VC runtime, STL…) We are working on the spec of a tool to acquire 3rd party libraries on Windows. We are targeting mainly OSS libraries, our tool will help dev to rebuild locally from the source code on Windows. Today we have a proto, based on a port tree approach. (having a repo with the build script and the associated patch file) I wanted to have a discussion with the Boost community about this project, and how dev could acquire Boost this way. Feel free to contact me to initiate this discussion, we’ll be happy to share our idea and prototype with you and collect feedback and suggestions. Best, Eric Mittelette Senior Program Manager – Visual C++ (VCLib) Microsoft Corp. CONFIDENTIALITY NOTICE: This message is the property of International Game Technology PLC and/or its subsidiaries and may contain proprietary, confidential or trade secret information. This message is intended solely for the use of the addressee. If you are not the intended recipient and have received this message in error, please delete this message from your system. Any unauthorized reading, distribution, copying, or other use of this message or its attachments is strictly prohibited.

1 0

filesystem path{}.string() interface brittle when developing cross platform
by Werner Erasmus 05 Jul '16

05 Jul '16

Firstly, I would like to than the author/s of filesystem for their great work and their time. I've recently written some code on Linux where I had to adapt a filesystem::path object to string. I noticed that the return value was of type [const std::string&], and used the same return value in my getter that exposed the underlying string. Moving over to windows, I had strange crashes (undefined behaviour) as result of the type under windows being converted to [std::string]. The reason for the "undefined behaviour" took me a while to figure out. While understanding why the author returned by value (Windows API underlying type not a std::string...), I think that for a specific type, the contract concerning return value "semantics" should no be broken. There is a significant difference between returning by const reference as opposed to returning by value. If the contract cannot be held, the decision should be made to (in the interest of consistency/clarity) to return the same type for all OS's/platforms if the code is to be considered platform independent. This might mean to compromise by returning by value, or to, in the case of Windows (where the underlying string has a different type), cache the string, or at the very least document a *BOLD* note that caution must be taken. I can comprehend that if conversion is required, return by value is the only option. I expect type consistency per type, as this to me is part of the contract of a function. I don't consider this a bug, but would appreciate some response. Kind Regards

3 2

[coroutine2] - exceptions from constructor fail
by Tamas.Ruszkai＠leica-geosystems.com 01 Jul '16

01 Jul '16

2 1

Re: [Boost-users] Multiprecison: converting a complex class to a number<> backend (John Maddock)
by Daniel Brake 30 Jun '16

30 Jun '16

Hi Boost, particularly John Maddock and Christopher Kormanyos *first my response to John:* > From: John Maddock <jz.maddock(a)googlemail.com> > Date: Wed, 29 Jun 2016 19:28:19 +0100 Subject: Re: [Boost-users] Multiprecison: converting a complex class to a > number<> backend I suggest you take a look at rational_adaptor which does more or less > exactly this but for rational types - if you basically just gut the > function implementations from that file, search and replace the class > names, and then fill in the blanks you should be 95% there. > this is exactly the kind of advice i was looking for, thanks very much!!! i think i can get started almost right away. > This is actually something that's been on our TODO list for far too long, > ideally this should be part of the library - fancy helping out - or at > least being a testing guinea pig? > absolutely, i would love to help with this. the major challenge I see for getting everything fully functional in my active codebase using the new backend is Eigen. I continue to push the boundaries of Eigen with respect to expression templated numeric types, ha. i absolutely love that library! by the time I am done with my code, it will be expressions and templates the whole way down. i am guessing that personal emails or the dev list are the best place to continue discussion of helping work on this part of the library? > I quickly mocked up an example (attached) of how I think this should look > if we were to add it to the library, basically: > thanks for the mock-up! > As noted in the attached example, we really need another number category > for complex types, and while mixed arithmetic with (real) scalars will just > work, if you wanted an imaginary type as well, that would involve a whole > lot more work, as class number does not currently support return a type > different from either argument type in the binary operators (for real + > imaginary for example). > mixed real-complex is enough for me for now, adding imag-real specializations won't affect much of my codebase, so not currently a high priority for me. sometime over the rainbow, it might become important, but not right now. > And finally... there is this: > https://code.google.com/archive/p/cpp-imaginary-numbers/ which takes a > different view of things (but loses multiprecision's expression templates). > I really need the expression templates, but this is a good resource. thanks for the link. > PS, one final note: ideally this would be handled by std::complex, but > sadly that class can not be instantiated on any type other than > float/double/long double with invoking undefined behaviour. > agreed. the STL's most disappointing template to me: the std::complex. i was disheartened to feed in higher precision types, and get only double precision out of atan. then i found out about the invocation of UB resulting from what i had done... thanks for the response, John. you are always most helpful, and I really appreciate your time. ---------- *second, my response to Christopher and John* On 29/06/2016 22:17, Christopher Kormanyos wrote: > >> >> In my opinion, trying to adapt a complex number class to the backend >> requirements of number might not be the best way to go. >> >> I would recommend writing an extended complex template class >> that is intended to be instantiated for both user-defined types as well as >> float, double and long double. >> > should be a relatively easy conversion, to add template parameters to my class, and replace the hard-code of real_ and imag_ type. this is definitely a desirable modification, though not a pressing need in my context. It would be nice to be able to use any type. John, I think we should talk about the final needs of a complex_backend for inclusion in the multiprecision library. Thanks for the response Christopher. Thanks for reading and responding! Daniel

2 1

Re: [Boost-users] boost::serialize 1.61 ticket #12141 not quite fixed for VS2015? (Robert Ramey)
by Colin Humphries 30 Jun '16

30 Jun '16

Hello Robert, Thank you for your quick reply. Today I down-loaded and rebuilt boost 1.61.0, for both .zip and .7z versions from boost.org but I still see that final expanded line. Regards Colin Humphries On 6/26/16 3:33 PM, Colin Humphries wrote: > After converting to boost 1.61 and Visual Studio 15 we now see a > problem closely related to one reported in ticket #12141. Our XML > archives now end with the following 2 lines: > > </boost_serialization> > </boost_serialization> > > Could someone suggest a quick fix please? I think the problem must be > in archive/impl/xml_woarchive_impl.ipp but I cannot grasp how > the archive destructor emits the last line. When this was reported we took emergency action to make sure it was addressed before the final release. Are you sure you have the actual 1.61 final release? Robert Ramey >

1 0

boost unit test framework exports std::basic_ostringstream
by Sascha Kremers 30 Jun '16

30 Jun '16

The boost unit test framework exports std::basic_ostringstream to the dll. This causes linker errors on visual studio 2012 (LNK 2005), if the tested code contains std::basic_ostringstream. You can confirm the symbol std::basic_ostringstream is in boost_unit_test_framework-vc110-mt-1_61.dll by using dependency walker. I have the same problem with my self-built dlls as well as the ones downloaded from https://sourceforge.net/projects/boost/files/boost-binaries/. Is this a problem with boost or did I configure the build wrong? Thank you. I posted the issue on Stack Overflow a week ago [1]. Please excuse, if this still counts as cross posting. Regards Sascha [1] http://stackoverflow.com/questions/37922117/stdbasic-ostringstream-exported…

2 2

Re: [Boost-users] Multiprecison: converting a complex class to a number<> backend
by John Maddock 30 Jun '16

30 Jun '16

On 29/06/2016 22:17, Christopher Kormanyos wrote: > > In my opinion, trying to adapt a complex number class to the backend > requirements of number might not be the best way to go. > > I would recommend writing an extended complex template class > that is intended to be instantiated for both user-defined types as well as > float, double and long double. > > The real and imag parts are template parameter types. They could be > of type mpfr_float because the template parameter type is > determined at compile-time when the class is instantiated. > > In the winter, I wrote an extended complex class and tested it extensively > with multiprecision and fixed point. There was also another candidate > implementation of extended complex a few years ago from another > developer, but it never got to review. > > I have not yet made my extended complex code available. > > I am not subscribed to the user's list. If the post gets to the > developer's > list, there is a good chance I will see it. I'm curious as to what you see as the stumbling block to providing a complex number backend to class number<> ? The main advantages are that the expression-template code and all operator overloads are "just there" already, what do you see as the drawbacks? Best, John.

1 0

Multiprecison: converting a complex class to a number<> backend
by Daniel Brake 29 Jun '16

29 Jun '16

Hi Boost, I have implemented my own complex class wrapping around Boost.Multiprecision number<>, particularly mpfr_float. Now, I'd like to take the class I've written, and extend/convert it into a backend suitable for use in number<>. While I've read the documentation describing the requirements for a backend <http://www.boost.org/doc/libs/1_61_0/libs/multiprecision/doc/html/boost_mul…>, and think I understand what I need to do, I have found 0 examples in the wild. My current setup has a pair of files mpfr_complex.hpp, mpfr_complex.cpp describing something like (just what you'd expect, really) --------- class complex{ mpfr_float real_, imag_; public: // the *= family of operators, getters, setters, // some factory functions, etc }; //the free operators defined down here, along with pow, exp, etc. -------------- I think what I'd like to write is a new complex_backend.hpp file which implements the required functions for the complex wrapper around mpfr_float. In this file, I believe I implement the family of functions such as eval_multiply(b, a) in terms of the operators for my complex class. Is this right? In a related vein, with et_on for mpfr_float, I've started adding templated overloads for the complex operators and math function accepting expressions of reals, and I think this is going to get out of hand, so using number<> would conceivably save me a ton of time writing my own functions. It will also save me a ton of errors for hand-writing the expression templates for complexes, which appear to be ready to go from Boost.Multiprecision once I get a backend implemented. Again, my goal is expression templates for complexes with real and imaginary fields consisting of mpfr_floats, leveraging the number<> template, with et_on, and my own backend. Do you have any advice? Any references to any other custom backends? Daniel Brake University of Notre Dame Applied and Computational Mathematics and Statistics

2 1

Boost interprocess mutex with shared memory
by Ashok Palaniswamy 28 Jun '16

28 Jun '16

Hi all, I want to implement boost interprocess mutex with shared memory. This mutex will protect the SMBUS access between multiple processes. In the entire source code, this mutex will be used across different the files. Please let me know if you have any sample programs available. Thanks, P.Ashok L&T Technology Services Ltd www.LntTechservices.com<http://www.lnttechservices.com/> This Email may contain confidential or privileged information for the intended recipient (s). If you are not the intended recipient, please do not use or disseminate the information, notify the sender and delete it from your system.

2 1

boost::serialize 1.61 ticket #12141 not quite fixed for Visual Studio 15?
by Colin Humphries 27 Jun '16

27 Jun '16

After converting to boost 1.61 and Visual Studio 15 we now see a problem closely related to one reported in ticket #12141. Our XML archives now end with the following 2 lines: </boost_serialization> </boost_serialization> Could someone suggest a quick fix please? I think the problem must be in archive/impl/xml_woarchive_impl.ipp but I can't seem to grasp how the archive destructor emits the last line. Regards, Colin Humphries

2 1

Backend of multi_index container
by Anaswara Nair 27 Jun '16

27 Jun '16

Hi, I was going through the documentation of boost::multi_index container. I would like to know what is in its back end. Something like B-Tree,B+tree,etc.? Actually I want to create a database(in the sense it contains millions of records), but need not be reusable at a later period of time. i.e, I am looking only for run-time persistent data. Once data is inserted to this, it will not be modified. And there will be a unique id for each record. I would also like to know whether multi_index is the best suited one for the implementation of my so called database.. Thankyou

6 16

Re: [Boost-users] Backend of multi_index container
by anaswara 26 Jun '16

26 Jun '16

I have 7 fields in each record,two strings and five 64 bit integers. Of these,one of the integers is unique. I need to store all such records into the DB. In multi-index, I have a structure and this structure is being indexed by that integer value. If I have to similarly create a structure and store it as the value in LMDB, then what is its difference from multimap? I can do the same in multimap also. Then how does LMDB become a database. Sent from Samsung Mobile -------- Original message -------- From: degski <degski(a)gmail.com> Date: 24/06/2016 7:43 PM (GMT+05:30) To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Backend of multi_index container On 24 June 2016 at 15:51, Anaswara Nair <anaswara.nn(a)gmail.com> wrote: I have gone through LMDB. However AFAIK LMDB stores the data as a key-value pair. Yes, it's a key-value store. Though duplicate keys are allowed, I couldn't find any relation between these entries. I couldn't understand its use as a database as well. It's like std::(multi)map, maybe the wikipedia entry helps. Can you provide some help so that I can go deeper into this. In your original question, you refer to having one unique ID and some related data per record. Maybe you could expand a bit on what you would like to achieve. degski

1 0

[Boost.PropertyTree] Application hangs (Boost 1.61)
by Andrew C 25 Jun '16

25 Jun '16

Hi! It seems to be a bug that this application hangs inside "erase" method: #include <boost/property_tree/ptree.hpp> int main() { boost::property_tree::ptree pt; pt.erase(pt.begin()); // enters infinite loop... } Compiled with Cygwin/GCC-5.4.0. Is it really a bug or my misuse? Thanks!

2 2

CPack, CMake and Boost's shared libraries
by r＠primef.actor 25 Jun '16

25 Jun '16

What is the canonical cross-platform way to package boost shared libraries with CPack (and/or CMake)? On Windows, DLLs can be copied to the executable's folder and it will "just work". On OS X, one can use install_name_tool to set up a so-called rpath pointing to a relative location where the libraries reside, relative to the executable. On Ubuntu, one can similarly use ldd for setting up the correct pointers to where the libraries will reside relative to the executable. The question is then: is there some documentation on how to ship boost libraries along with your executable, in a cross-platform and canonical way, with CPack? Here's a question on stack overflow [1] that addresses the same problem, however the proposed solution of using set(CMAKE_EXE_LINKER_FLAGS "-Wl,-rpath='$ORIGIN'") in CMake does not seem cross-platform to me (MSVC won't recognize the command). Regards, Raoul [1]: http://stackoverflow.com/questions/26142948/packaging-c-program-using-boost…

1 0

[Interprocess] Sharing FFMPEG Datatypes
by Loren Garavaglia 25 Jun '16

25 Jun '16

Hi All, I'm trying to figure out if it's possible using Boost to share FFMPEG data between 2 processes. What I'm trying to do is have one process read from a video stream and place the received packets in a buffer. The other process then reads from the buffer, decodes the packet, and does some analysis on the image. Unfortunately, due to some constraints I cannot take a multi-threaded approach to this problem. My data that I would like to share is as follows: struct FFMPEGData { AVFormatContext *pFormatCtx; AVCodecContext *pCodecCtx; AVCodec *pCodec; AVFrame *pFrame, dst; AVPacket *packet; AVPacket* pack = new AVPacket[packetNum]; struct SwsContext *convert_ctx; }; With "pack" being my buffer with a set size. I tried following the boost example here <http://www.boost.org/doc/libs/1_57_0/doc/html/interprocess/allocators_conta…> but it seems to be for a simpler form of complex data. All of the FFMPEG datatypes are structs themselves, so I wasn't sure what to do. My question is, is it even possible to share these kinds of datatypes between processes using Boost Interprocess and if so do I need to create allocators and containers for all of the data fields within these FFMPEG datatypes? Thanks, Loren

2 1

Boost + Android NDK r11 + Clang
by Robert Dailey 23 Jun '16

23 Jun '16

How can I cross-compile static boost libraries for Clang in Android NDK r11 (arm) along with LLVM C++ (static)? Thanks in advance for detailed instructions

1 0

[iostreams] use of gzip_compressor with strings
by Boncek, John 23 Jun '16

23 Jun '16

I need to do some in-memory manipulation of strings, including compression to gzip format. I am new to the use of Boost and to the use of gzip. I found the following snippet on the Internet, compressing a std::string and producing a new std::string as output. This implies that gzip_compressor never produces a null byte in its output but the gzip_compressor documentation doesn't say that and my search of the underlying library zlib documentation doesn't say anything like that either. So is this a correct use? std::string compress(const std::string& data) { namespace bio = boost::iostreams; std::stringstream compressed; std::stringstream origin(data); bio::filtering_streambuf<bio::input> out; out.push(bio::gzip_compressor(bio::gzip_params(bio::gzip::best_compression))); out.push(origin); bio::copy(out, compressed); return compressed.str(); } Thanks, John Boncek

2 2

[Context] Console output problem under Cygwin
by Andrew C 23 Jun '16

23 Jun '16

Hi! Boost.Context examples (libs\context\example\v2) behave strangely under Cygwin/GCC-5.4.0. The problem is that all of the example applications output nothing to console. For example, jump_void.exe just ends at first "std::cout" command in execution context without any crash. This is the command line arguments I use to build both Boost.Context library and examples: b2.exe variant=debug link=static cxxflags="-std=c++14 -Wall -pedantic -D_GNU_SOURCE" Does anyone else ever met such a problem? Could it be a compiler bug or Boost.Context defect? Note: Under MinGW/GCC-4.9.3 all works OK. Thanks!

1 0

[polygon] get_trapezoids not reporting holes?
by David Thompson 22 Jun '16

22 Jun '16

Hi all, I am having trouble with boost::polygon: when get_trapezoids is called on a polygon_set_data containing a polygon_with_holes_data, it returns trapezoids covering the outer loop but that cover the hole (i.e., the hole is being ignored). A small example is below to demonstrate. I've tried with boost 1.60, 1.55, and 1.50. Am I doing something wrong? Thanks, David #include "boost/polygon/polygon.hpp" #include <vector> namespace poly = boost::polygon; typedef long long Coord; typedef poly::point_data<Coord> Point; Coord outerPts[] = { -37205784000000LL, -22528321200000LL, -20252740200000LL, -40391736000000LL, 19228717200000LL, -39708900000000LL, 37774737000000LL, 32882157000000LL, -37205784000000LL, -22528321200000LL, }; Coord innerPts[] = { -8808676800000LL, -4351000500000LL, 29799924000000LL, 21288613500000LL, 8185023000000LL, -10611816600000LL, -8808676800000LL, -4351000500000LL, }; template<typename T> void liftPt(double x[2], const T& pt, double sf) { x[0] = sf * pt.x(); x[1] = sf * pt.y(); } template<typename T> void print_polyarray(const std::string& msg, T& parr, double scale, double iscale) { std::cout << msg << " has " << parr.size() << " polygons\n"; std::vector<poly::polygon_data<Coord> >::const_iterator pit; int pp = 0; for (pit = parr.begin(); pit != parr.end(); ++pit, ++pp) { poly::polygon_data<Coord>::iterator_type pcit; std::cout << " Polygon " << pp << " has " << pit->size() << " points\n"; double p0[2]; for (pcit = poly::begin_points(*pit); pcit != poly::end_points(*pit); ++pcit) { liftPt(p0, *pcit, iscale); std::cout << " " << p0[0] << " " << p0[1] << "\n"; } std::cout << "--\n"; } } int main() { const double scale = 2.31e13; const double iscale = 1./2.31e13; poly::polygon_with_holes_data<Coord> pface; std::vector<poly::polygon_data<Coord> > holes; poly::polygon_data<Coord> loop; std::vector<Point> polypts1; for (unsigned ii = 0; ii < sizeof(outerPts)/sizeof(outerPts[0])/2; ++ii) { polypts1.push_back(Point(outerPts[2*ii], outerPts[2*ii + 1])); } pface.set(polypts1.begin(), polypts1.end()); std::vector<Point> polypts2; for (unsigned ii = 0; ii < sizeof(innerPts)/sizeof(innerPts[0])/2; ++ii) { polypts2.push_back(Point(innerPts[2*ii], innerPts[2*ii + 1])); } loop.set(polypts2.rbegin(), polypts2.rend()); holes.push_back(loop); pface.set_holes(holes.begin(), holes.end()); Point holecenter( 9725423400000LL, 2108598800000LL); Point nonholepnt(37774730000000LL, 32882150000000LL); // ^^ Compare to 37774737000000LL, 32882157000000LL, which is a vertex in outerPts. std::cout << "Polygon has " << pface.size() << " vertices and " << pface.size_holes() << " holes\n"; std::cout << "Winding is " << (poly::winding(pface) == poly::CLOCKWISE ? "cw" : "ccw") << "\n"; std::cout << "Contains hole center? " << (poly::contains(pface, holecenter) ? "Y" : "N") << "\n"; std::cout << "Contains point it should? " << (poly::contains(pface, nonholepnt) ? "Y" : "N") << "\n"; // The above demonstrates that pface appears to be a valid polygon with a hole. // However, now when we ask for trapezoids, no hole is provided: // Add pface to polys so we can get trapezoids: poly::polygon_set_data<Coord> polys; std::vector<poly::polygon_data<Coord> > parr; polys.insert(pface); polys.get(parr); // This prints that parr (and thus polys) contains 0 polygons, which seems wrong: print_polyarray("Original polygon set", parr, scale, iscale); polys.get_trapezoids(parr); // This prints 2 polygons that form only the outer boundary, which seems wrong: print_polyarray("Tessellation ", parr, scale, iscale); return 0; }

1 0

[boost] Checking interest in stacktrace library
by Antony Polukhin 22 Jun '16

22 Jun '16

Hi, I've got some prototype for getting stack traces: https://github.com/apolukhin/stacktrace It's design is based on the idea that class for stacktrace must be fully noexcept, without dynamic allocations in constructors and as simple as possible. Is there interest in it? What functionality would you like to have in it? -- Best regards, Antony Polukhin

7 12

Coroutine jump_fcontext crash (Boost 1.61)
by Jason Mancini 22 Jun '16

22 Jun '16

Hello, Starting with Boost 1.61, if -DBOOST_USE_VALGRIND=1 is set, then the Coroutine sample from boost docs crashes on first stack switch. Is this a known issue? (We're using GCC 6.1 on 64-bit Linux.) Not posting a code sample, it's literally the exact one from the Coroutine web page. Compile with the define, then run. We have Valgrind 3.10.1 installed. [Curiously, the Context code sample runs fine.] I am suspecting a missing snippet on the Coroutine side that affects stack_context structure size. Thanks! Jason # gdb ./a.out ... SIGSEGV, Segmentation fault. (gdb) bt #0 0x00002aaaaaab3ec0 in jump_fcontext () from .../lib/libboost_context.so.1.61.0 (gdb)

3 8

Re: [Boost-users] Suggestion for boost::dll:import_alias<>() or boost::dll::import<>()
by Leo Carreon 19 Jun '16

19 Jun '16

Sorry, I figured out how to use the search capability. I was misinformed because the documentation did not include the possible values for boost::dll::load_mode which I discovered by needing to have a look in the source code. From: Leo Carreon Sent: Sunday, June 19, 2016 1:40 PM To: Boost Users Mailing List Subject: Suggestion for boost::dll:import_alias<>() or boost::dll::import<>() Hi, I have been experimenting with the Boost.DLL library and I have discovered that the “lib” argument of either boost::dll::import_alias<>() or boost::dll::import<>() functions require the full path to the shared library to load. If I’m not mistaken, this functions use either the POSIX dlopen() function or the Windows LoadLibrary() function. These platform specific functions are capable of searching a list of paths if a non-qualified shared library name is given. My suggestion is to use this search capability for non-qualified shared library names. Kind regards, Leo Carreon

1 0

Suggestion for boost::dll:import_alias<>() or boost::dll::import<>()
by Leo Carreon 19 Jun '16

19 Jun '16

Hi, I have been experimenting with the Boost.DLL library and I have discovered that the “lib” argument of either boost::dll::import_alias<>() or boost::dll::import<>() functions require the full path to the shared library to load. If I’m not mistaken, this functions use either the POSIX dlopen() function or the Windows LoadLibrary() function. These platform specific functions are capable of searching a list of paths if a non-qualified shared library name is given. My suggestion is to use this search capability for non-qualified shared library names. Kind regards, Leo Carreon

1 0

is parallel-bgl active?
by Salvador Aguiñaga 17 Jun '16

17 Jun '16

Installing on a local 2 core system on a cluster ends in errors Installing on small system I want to use for temporary development, I get the following error. > > >parallel-bgl-0.7.0/boost/property_map/property_map.hpp:16:37: fatal > error: boost/pending/cstddef.hpp: No such file or directory > compilation terminated > > I've configured the system: > >"sudo apt-get install build-essential" > > And successfully installed the openmpi: "openmpi-1.10.2.tar.bz2" > > But when I get to: > /parallel-bgl-0.7.0/build/cmake .. > > I can't find a good solution online to this cstddef.hpp error. > > Any suggestions? > > > My system: uname -a > > Linux atomix 4.2.0-16-generic #19-Ubuntu SMP Thu Oct 8 14:46:51 UTC 2015 > i686 i686 i686 GNU/Linux >

1 0

Re: [Boost-users] boost bind, issue moving from 1.57 to 1.60
by Jason Mancini 17 Jun '16

17 Jun '16

We worked around this failure by changing: Func = boost::bind(Func, _1) && boost::bind(&Boom::Oops, _1); to Func = boost::bind(AND, Func, &Boom::Oops, _1); // custom AND function Not sure why it used to work, or why it still works with raw pointers, but not shared_ptr. The actual change happens from 1.59 (working) to 1.60 (changed behavior). Jason

4 11

Undefined Reference to 'boost::system::generic_category()'
by Blair Climenhaga 16 Jun '16

16 Jun '16

Hello everyone, I have been attempting to install OpenFOAM however the boost library has been giving me trouble, most recently reading out these error during OpenFOAM installation. undefined reference to `boost::system::generic_category()' undefined reference to `boost::system::system_category()' undefined reference to `boost::detail::set_tss_data(void const*, boost::shared_ptr<boost::detail::tss_cleanup_function>, void*, bool)' undefined reference to `boost::detail::get_tss_data(void const*)' If anyone has ever encountered this problem before, or has a hypothesis on how to solve I would be eager to hear your advice. I should mention that this error has persisted across multiple attempts at boost installs (1.48.0,1.52, and 1.61.0) as well as an update of my system from Ubuntu 12.04 to 14.04. Thank you everyone for your time in reading this and for any advice you may give. All the best, Blair Climenhaga

4 6

[xint] Ptoblems with compiling
by Андрей Серебро 16 Jun '16

16 Jun '16

1 0

[Log] Get the streams in a text_ostream_backend derived class
by Florian Lindner 16 Jun '16

16 Jun '16

Hello, I have class StreamBackend : public boost::log::sinks::text_ostream_backend and manually instantiate the backend and add a stream boost::shared_ptr<StreamBackend> backend = boost::make_shared<StreamBackend>(); backend->add_stream(boost::shared_ptr<std::ostream>(new std::ofstream(some file name))); using sink_t = boost::log::sinks::synchronous_sink<StreamBackend>; boost::shared_ptr<sink_t> sink(new sink_t(backend)); sink->set_formatter(config.second.format); sink->set_filter(config.second.filter); boost::log::core::get()->add_sink(sink); All I want is to overwrite the consume function in the derived class. Since I want to retain the original functionality as far as possible, I would like to work on the streams added add_streams. Problem is that the m_pImpl->m_Streams vector in the implementation is private and there is no method to get the added streams. What is the best way to go here? Thanks, Florian

1 0

boost bind, issue moving from 1.57 to 1.60
by Jason Mancini 16 Jun '16

16 Jun '16

Hello, The following minimized program works under 1.57 but no longer under 1.60, as the second bind results in calling of a member function with nullptr at run-time. Is the code mal-formed? Is it a boost bind bug? It still works fine with raw pointers, but no longer works correctly with boost::shared_ptr. Same result with gcc 4.8.1 and gcc 6.1.0 on Linux. Thanks, Jason ------------------- #include <stdio.h> #include <boost/shared_ptr.hpp> #include <boost/make_shared.hpp> #include <boost/bind.hpp> #include <boost/function.hpp> struct Boom { bool Oops() const { printf("Boom::Oops @ %p\n", this); return true; } }; int main() { boost::shared_ptr<const Boom> obj = boost::make_shared<Boom>(); using tMatcher = boost::function<bool(boost::shared_ptr<const Boom>)>; tMatcher Func = boost::bind(&Boom::Oops, _1); Func = boost::bind(Func, _1) && boost::bind(&Boom::Oops, _1); Func(obj); } ------------------- Expected output: Boom::Oops @ 0x11f6d79 Boom::Oops @ 0x11f6d79 Actual output: Boom::Oops @ 0x11f6d79 Boom::Oops @ (nil) -------------------

1 0

Handling process termination
by Shaginesh P.K.(NeSTIT) 12 Jun '16

12 Jun '16

Hi All, I am using boost library for logger. Seems pretty good. Am using boost with asynchronous sink. Hence require a close down of sink explicitly. But this is not possible when process crashes. Do boost have any mechanism for the same (Like handling the signals of OS and like stack dumps)? What does boost prefer for unexpected termination of process where the logs will go out uncollected? Could you please help me out of this? Thanks and Regards Shaginesh PK ________________________________ Confidentiality Statement / Disclaimer : This message and any attachments is intended for the sole use of the intended recipient. It may contain confidential information. Any unauthorized use, dissemination or modification is strictly prohibited. If you are not the intended recipient, please notify the sender immediately then delete it from all your systems, and do not copy, use or print. Internet communications are not secure and it is the responsibility of the recipient to make sure that it is virus/malicious code exempt. The company/sender cannot be responsible for any unauthorized alterations or modifications made to the contents. If you require any form of confirmation of the contents, please contact the company/sender. The company/sender is not liable for any errors or omissions in the content of this message. ________________________________

2 2

Re: [Boost-users] Another query on Boost DLL Library
by Leo Carreon 11 Jun '16

11 Jun '16

Please ignore this question, I found out the answer with a bit more understanding of the example. From: Leo Carreon Sent: Thursday, June 09, 2016 2:07 PM To: Boost Users Mailing List Subject: Another query on Boost DLL Library Hi, When using the factory method when creating a plugin, is it possible to pass an argument to the factory method? If yes, how? Kinds regards, Leo

1 0

Trouble Updating Boost to run OpenFOAM
by Blair Climenhaga 10 Jun '16

10 Jun '16

Hello Everyone, I have recently begun using OpenFOAM which requires boost for some of its functions, however upon installing OpenFOAM it appears that some of the needed Boost contents are not in my usr/include/boost such as the directories container, move, intrusive, core and many others. I have attempted to update boost in multiple ways so that these directories are added to the boost directory however I have had no success. The two types of attempts I have made are listed below. 1. Using sudo apt-get install libboost-all-dev, however this seems to just update the lib and provide me with the needed directories 2. Download the .zip of the newest boost version and follow the steps listed on the boost website. I have been downloading and installing the files to a directory in the home rather than usr and it seems that the product is not on the Path of the computer, as it is does not appear when I use the echo or whereis commands. If anyone has any advice for how to solve this issue or any recommendations I would greatly appreciate the assistance. Thank you for your time and for your help in advance. All the best, Blair Climenhaga

4 12

[boost] [thread] thread handling question
by Markus Pieper 09 Jun '16

09 Jun '16

Hi, this may be a very dumb question… My boost version is 1.56.0. In my program I use a database logging technique. To avoid blocking the main thread, I coded this: int main() { while(bDoCalculations == true) { // calculate some stuff m_Logger->doLogging(); } } void CLoggingData::doLogging() { std::vector<float>* Result; // fill Result boost::thread (&CLoggingData::doStoreData, this, Result); } void CLoggingData::doStoreData(std::vector<float>* dataVector) { // pass pointer to database writer instance delete dataVector; } I do not use join() in the doLogging method because I don’t want the main thread to block if the database is busy and will not respond immediately. But then, after a long run I get a boost::thread_resource_error exception. You may say: Of course, you never join your thread and after a few thousands new threads you blow your stack. Well, but what can I do to get my desired behavior? In the documentation I found this which I think of might help: You can use a thread_joiner to ensure that the thread has been joined at the thread destructor. int main() { boost::thread t(my_func); boost::thread_joiner g(t); // do someting else } // here the thread_joiner destructor will join the thread before it is destroyed. But where is the thread_joiner class implemented? Or do I have to add something inside my doStoreData method to end the thread properly? Thanks in advance, Markus Gesendet mit AquaMail für Android http://www.aqua-mail.com

4 6

Another query on Boost DLL Library
by Leo Carreon 09 Jun '16

09 Jun '16

Hi, When using the factory method when creating a plugin, is it possible to pass an argument to the factory method? If yes, how? Kinds regards, Leo

1 0

Re: [Boost-users] Query on Boost DLL Library
by Leo Carreon 09 Jun '16

09 Jun '16

After a bit more reading of the documentation, my understanding is std::shared_ptr can be used but not std::experimental::filesystem because boost::filesystem is an argument to boost::dll::import_alias. In light of this, can I request a revision to the Boost DLL Library. Can boost::filesystem be replaced with either std::experimental::filesystem or std::filesystem. whichever is available on the version of the compiler being used? The reason for this is so that there is only one version of the filesystem library to be used in your application. From: Leo Carreon Sent: Thursday, June 09, 2016 11:06 AM To: Boost Users Mailing List Subject: Query on Boost DLL Library Hi, In Boost DLL Library factory method example it uses boost::shared_ptr and boost::filesystem, can these be replaced by std::shared_ptr and std::experimental::filesystem? Kind regards, Leo

1 0

Query on Boost DLL Library
by Leo Carreon 09 Jun '16

09 Jun '16

Hi, In Boost DLL Library factory method example it uses boost::shared_ptr and boost::filesystem, can these be replaced by std::shared_ptr and std::experimental::filesystem? Kind regards, Leo

1 0

Re: [Boost-users] [boost] RFC : About forking a C++11 standard library and adapt it to C++98 compilers
by Vicente J. Botet Escriba 07 Jun '16

07 Jun '16

Le 06/06/2016 à 11:16, Joseph Van Riper a écrit : > On Thu, Jun 2, 2016 at 6:09 PM Vicente J. Botet Escriba < > vicente.botet(a)wanadoo.fr> wrote: > >> Hi, >> >> Some of us have to work yet with C++98 compiler at work (due to well >> know reasons) and this for a long time. This is a reality. >> >> I was wondering about forking a public domain C++11/14/17 standard >> library and adapt it to C++98 compilers. This library could be seen as >> another TR1, an extension of the C++03 standard library. >> >> Does this make any sens? Would this project be of interest for the >> Boost/C++ community? >> > Yes. At least for what we do where I work. > > The cyber-security field works with very old machines, either for forensics > (people forget they have some old machine until it gets hacked and some old > process that always "just worked" stops working), teaching (teaching old, > outmoded techniques helps to illustrate cyber security problems without > giving people tools for modern exploitation), or competitions. > > I kind of hate having to work with clunky, antediluvian C++ compilers that > magnify the level of woe required to deal with old machinery. Especially > while the rest of the C++ world moves on to the spiffy-shiny features found > in the later compilers. Having at least a library that helps us use some > of those nifty features can help us use our skills on more modern projects > when we move on to another job, while easing the efforts required to do our > work. A library wouldn't change your compiler ;-), but it could change the way you program :). > > Anyway, if you find that this will be useful to you at your work we will >> need your participation. Would you be interested in working on it? > > Hmmm... am I even knowledgeable enough? > > While I may find myself learning quite a lot about C++ by studying the > boost code people write, I am also humbled by what I see there. I fear I > am only beginning to dip into some of the intermediate meta-programming > techniques that seem to confer tremendous power to this language. > > as a Boost community project? >> outside Boost, as an independent project? >> > Hmmm... > > The boost 'brand' confers a certain gravitas. If you wish to maintain this > gravitas in the new library, I'd say keep the boost brand, but require the > same rigor. We have a License issue, so it couldn't be a Boost library :( Vicente P.S. Please, contact me privately if you are interested.

1 0

[BGL] breadth_first_search with distance record and predecessors?
by The Maschine 06 Jun '16

06 Jun '16

Hi all, Im trying to cover the dijkstra_shortest_paths call I usually do with a BFS. Id like to get back the predecessors so I can rebuild the paths and the distance to each vertex. The dijkstra_shortest_paths work for me fine! I tried a couple of BFS calls but I always get errors. What am I missing? std::vector<Vertex> predecessors(boost::num_vertices(m_ugraph)); // To store parents std::vector<Weight> distances(boost::num_vertices(m_ugraph), std::numeric_limits<double>::max() ); // To store distances IndexMap indexMap = boost::get(boost::vertex_index, m_ugraph); PredecessorMap predecessorMap(&predecessors[0], indexMap); DistanceMap distanceMap(&distances[0], indexMap); boost::dijkstra_shortest_paths(m_ugraph, s_vertex, boost::predecessor_map(predecessorMap).distance_map(distanceMap).weight_map(boost::get(&EdgeProperties::m_weight, m_ugraph)) ); //breadth_first_search(m_ugraph, s_vertex, visitor( make_bfs_visitor( record_predecessors( &predecessors, on_tree_edge() ) ) ).vertex_index_map( identity_property_map() ).record_distances(&distances.begin(),boost::on_tree_edge()) ); //boost::breadth_first_search(m_ugraph, s_vertex, boost::visitor(boost::make_bfs_visitor(std::make_pair(boost::record_distances(&distances.begin(),boost::on_tree_edge()),boost::record_predecessors(&predecessors.begin(),boost::on_tree_edge{}))))); Thanks a lot!

1 0

Boost.Fiber mini-review May 23 - June 1: review report
by Nat Goodspeed 06 Jun '16

06 Jun '16

The Boost.Fiber mini-review is now closed. Results: Bjorn Reese: YES Niall Douglas (private): YES Agustín K-ballo Bergé: YES Niall Douglas reminds me that in a previous mini-review he already voted to accept the Fiber library. Unless he stated that he had changed his mind, it would be reasonable to carry forward that "yes" vote. However, he did reaffirm his previous stance. In that spirit, let me remind the community of another couple previous positive votes: Eugene Yakubovich Antony Polukhin Significantly, there were no remaining NO votes. I therefore conclude that the Boost community ACCEPTS the Fiber library into the Boost family of libraries. On behalf of the Boost community, I would like to congratulate Oliver Kowalke not only for his engineering work, but for considerable patience in working to improve the library and its documentation. Thank you, Oliver!

3 3

Boost fusion problem
by Jess Morecroft 05 Jun '16

05 Jun '16

Hi guys, We're trying out the latest version of Boost (1.61, migrating from 1.55) and have some code calling the fusion library that now doesn't compile and it's not obvious (to me at least) why. I've created a simple program (below) to demonstrate the issue. As per the compile/run section below, this compiles and runs with Boost 1.55, not with 1.61. If anyone has any idea or pointers to what is wrong here I'd really appreciate it. Sorry if this isn't the right forum for this kind of issue too - if so please let me know how best to seek help on this. Regards Jess ******************** main.cpp #include <boost/fusion/algorithm/iteration/for_each.hpp> #include <boost/fusion/view/zip_view.hpp> #include <boost/fusion/tuple.hpp> #include <iostream> #include <string> struct Helper { template<typename Arg> void operator()(const Arg& arg) const { std::cout << boost::fusion::get<0>(arg) << std::endl; std::cout << boost::fusion::get<1>(arg) << std::endl; } }; int main() { const int myint(123); const double mydub(456.0); const std::string mystr("blah"); const bool mybool(false); typedef boost::fusion::tuple<const int&, const double&> Tuple1; typedef boost::fusion::tuple<const std::string&, const bool&> Tuple2; typedef boost::fusion::tuple<const Tuple1&, const Tuple2&> Tuple3; Helper helper; boost::fusion::for_each( boost::fusion::zip_view<Tuple3>( Tuple3(Tuple1(myint, mydub), Tuple2(mystr, mybool))), helper); return 0; } ******************** compile/run tests jess@flathead:~$ g++ --version g++ (Ubuntu 5.3.1-14ubuntu2) 5.3.1 20160413 Copyright (C) 2015 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. (boost 1.55) jess@flathead:~$ g++ -std=c++14 main.cpp jess@flathead:~$ ./a.out 123 blah 456 0 (boost 1.61) jess@flathead:~$ g++ -std=c++14 main.cpp In file included from /usr/local/include/boost/fusion/container/vector/vector10.hpp:25:0, from /usr/local/include/boost/fusion/view/transform_view/transform_view.hpp:22, from /usr/local/include/boost/fusion/algorithm/transformation/transform.hpp:11, from /usr/local/include/boost/fusion/view/zip_view/detail/begin_impl.hpp:14, from /usr/local/include/boost/fusion/view/zip_view/zip_view.hpp:16, from /usr/local/include/boost/fusion/view/zip_view.hpp:12, from main.cpp:2: /usr/local/include/boost/fusion/container/vector/vector.hpp: In instantiation of ‘constexpr boost::fusion::vector_detail::vector_data<std::integer_sequence<long unsigned int, _Idx ...>, T ...>::vector_data(boost::fusion::vector_detail::each_elem, U&& ...) [with U = {const boost::fusion::tuple<const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&>&}; long unsigned int ...I = {0ul, 1ul}; T = {const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&}]’: /usr/local/include/boost/fusion/container/vector/vector.hpp:305:97: required from ‘boost::fusion::vector<T>::vector(U&& ...) [with U = {const boost::fusion::tuple<const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&>&}; T = {const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&}]’ /usr/local/include/boost/fusion/view/zip_view/zip_view.hpp:128:30: required from ‘constexpr boost::fusion::zip_view<Sequences>::zip_view(const Sequences&) [with Sequences = boost::fusion::tuple<const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&>]’ main.cpp:32:64: required from here /usr/local/include/boost/fusion/container/vector/vector.hpp:230:52: error: mismatched argument pack lengths while expanding ‘boost::fusion::vector_detail::store<I, T>’ : store<I, T>(std::forward<U>(var))... ^ /usr/local/include/boost/fusion/container/vector/vector.hpp: In instantiation of ‘constexpr boost::fusion::vector_detail::store<<anonymous>, T>::store() [with long unsigned int <anonymous> = 0ul; T = const boost::fusion::tuple<const int&, const double&>&]’: /usr/local/include/boost/fusion/container/vector/vector.hpp:230:52: required from ‘constexpr boost::fusion::vector_detail::vector_data<std::integer_sequence<long unsigned int, _Idx ...>, T ...>::vector_data(boost::fusion::vector_detail::each_elem, U&& ...) [with U = {const boost::fusion::tuple<const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&>&}; long unsigned int ...I = {0ul, 1ul}; T = {const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&}]’ /usr/local/include/boost/fusion/container/vector/vector.hpp:305:97: required from ‘boost::fusion::vector<T>::vector(U&& ...) [with U = {const boost::fusion::tuple<const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&>&}; T = {const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&}]’ /usr/local/include/boost/fusion/view/zip_view/zip_view.hpp:128:30: required from ‘constexpr boost::fusion::zip_view<Sequences>::zip_view(const Sequences&) [with Sequences = boost::fusion::tuple<const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&>]’ main.cpp:32:64: required from here /usr/local/include/boost/fusion/container/vector/vector.hpp:137:24: error: value-initialization of reference type ‘const boost::fusion::tuple<const int&, const double&>&’ : elem() // value-initialized explicitly ^ /usr/local/include/boost/fusion/container/vector/vector.hpp: In instantiation of ‘constexpr boost::fusion::vector_detail::store<<anonymous>, T>::store() [with long unsigned int <anonymous> = 1ul; T = const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&]’: /usr/local/include/boost/fusion/container/vector/vector.hpp:230:52: required from ‘constexpr boost::fusion::vector_detail::vector_data<std::integer_sequence<long unsigned int, _Idx ...>, T ...>::vector_data(boost::fusion::vector_detail::each_elem, U&& ...) [with U = {const boost::fusion::tuple<const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&>&}; long unsigned int ...I = {0ul, 1ul}; T = {const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&}]’ /usr/local/include/boost/fusion/container/vector/vector.hpp:305:97: required from ‘boost::fusion::vector<T>::vector(U&& ...) [with U = {const boost::fusion::tuple<const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&>&}; T = {const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&}]’ /usr/local/include/boost/fusion/view/zip_view/zip_view.hpp:128:30: required from ‘constexpr boost::fusion::zip_view<Sequences>::zip_view(const Sequences&) [with Sequences = boost::fusion::tuple<const boost::fusion::tuple<const int&, const double&>&, const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&>]’ main.cpp:32:64: required from here /usr/local/include/boost/fusion/container/vector/vector.hpp:137:24: error: value-initialization of reference type ‘const boost::fusion::tuple<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const bool&>&’

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Re: [Boost-users] [boost] RFC : About forking a C++11 standard library and adapt it to C++98 compilers
by Vicente J. Botet Escriba 03 Jun '16

03 Jun '16

Le 03/06/2016 à 01:35, Edward Diener a écrit : > On 6/2/2016 6:09 PM, Vicente J. Botet Escriba wrote: >> Hi, >> >> Some of us have to work yet with C++98 compiler at work (due to well >> know reasons) and this for a long time. This is a reality. >> >> I was wondering about forking a public domain C++11/14/17 standard >> library and adapt it to C++98 compilers. This library could be seen as >> another TR1, an extension of the C++03 standard library. >> >> Does this make any sens? Would this project be of interest for the >> Boost/C++ community? > > Most C++11 libraries have a Boost equivalent. In that case you could > either use the Boost library equivalent with your C++98 compiler or > use CXXD so that when you upgraded to a C++11 compiler you would not > have to change your code. CXXD would not ensure an almost compliant standard library. CXXD could be used to choose between this new library (scope C++11, implementation C++98) and the C++11 standard one. > So I assume you are talking about a C++11 library that does not have a > Boost equivalent. In which case what C++11/14/17 standard library are > you interested in forking ? No I was talking about the whole C++11 standard library. Vicente

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RFC : About forking a C++11 standard library and adapt it to C++98 compilers
by Vicente J. Botet Escriba 03 Jun '16

03 Jun '16

Hi, Some of us have to work yet with C++98 compiler at work (due to well know reasons) and this for a long time. This is a reality. I was wondering about forking a public domain C++11/14/17 standard library and adapt it to C++98 compilers. This library could be seen as another TR1, an extension of the C++03 standard library. Does this make any sens? Would this project be of interest for the Boost/C++ community? I have not a clear idea of the cost of doing this work, how it should be done, what would be the limitations, ... but I'm sure that this would be quite useful on the projects that are forced to use C++98 and an excellent bridge to those that will move from C++98 to C++11 compilers. There are some Boost libraries that could be used to reduce the limitations, as Boost.Config/Predef, Boost.Move, ...and others that could be used as inspiration on how to implement them using C++98. Anyway, if you find that this will be useful to you at your work we will need your participation. Would you be interested in working on it? as a Boost community project? outside Boost, as an independent project? Comments and suggestion welcome. Best, Vicente P.S. The same can be done for C++14 standard libraries and the future standard C++17 libraries P.S.S. The same can be done for C++14 libraries and the future C++17 libraries but this time adapting to C++11 compilers (this will be much easier but the concerned community will be quite different ).

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[build] error: target { link%link.do-link-recursively-chrono/stopwatches-headers. } has no type
by Nat Goodspeed 02 Jun '16

02 Jun '16

Steven, what do these errors mean, and how can I fix them? https://travis-ci.org/BorisSchaeling/boost-process/builds/134823441 This travis script is trying to embed the candidate Boost.Process library in a boost_1_61_0 tarball tree and build libs/process/test. But I must admit I've been stumped by similar errors several times before. /home/travis/build/BorisSchaeling/boost-process/boost_1_61_0/tools/build/src/build/generators.jam:1102: in ensure-type from module generators error: target { link%link.do-link-recursively-chrono/stopwatches-headers. { libs/chrono/stopwatches/include/boost. } } has no type /home/travis/build/BorisSchaeling/boost-process/boost_1_61_0/tools/build/src/build/generators.jam:1359: in generators.construct from module generators /home/travis/build/BorisSchaeling/boost-process/boost_1_61_0/tools/build/src/build/targets.jam:1553: in construct from module object(typed-target)@1725 /home/travis/build/BorisSchaeling/boost-process/boost_1_61_0/tools/build/src/build/targets.jam:1353: in class(a)basic-target.generate from module object(typed-target)@1725 /home/travis/build/BorisSchaeling/boost-process/boost_1_61_0/tools/build/src/build/targets.jam:774: in generate-really from module object(main-target)@1862 /home/travis/build/BorisSchaeling/boost-process/boost_1_61_0/tools/build/src/build/targets.jam:746: in class(a)main-target.generate from module object(main-target)@1862 /home/travis/build/BorisSchaeling/boost-process/boost_1_61_0/tools/build/src/build/targets.jam:272: in class(a)project-target.generate from module object(project-target)@1721 /home/travis/build/BorisSchaeling/boost-process/boost_1_61_0/tools/build/src/build-system.jam:714: in load from module build-system /home/travis/build/BorisSchaeling/boost-process/boost_1_61_0/tools/build/src/kernel/modules.jam:295: in import from module modules /home/travis/build/BorisSchaeling/boost-process/boost_1_61_0/tools/build/src/kernel/bootstrap.jam:139: in boost-build from module /home/travis/build/BorisSchaeling/boost-process/boost_1_61_0/boost-build.jam:17: in module scope from module

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Linker error when using time_from_string
by nick.snels＠telenet.be 02 Jun '16

02 Jun '16

The following code gives an error for the time_from_string function (from_time_t works just fine): using namespace boost::posix_time; ptime epoch = from_time_t(0); ptime other = time_from_string("2011-08-09 17:27:00.000000"); The error is: main.obj:-1: error: LNK2019: unresolved external symbol "public: static class boost::shared_ptr<class std::map<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,unsigned short,struct std::less<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::allocator<struct std::pair<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const ,unsigned short> > > > __cdecl boost::gregorian::greg_month::get_month_map_ptr(void)" (?get_month_map_ptr@greg_month@gregorian@boost@@SA?AV?$shared_ptr@V?$map@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@GU?$less@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@2@V?$allocator@U?$pair@$$CBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@G@std@@@2@@std@@@3@XZ) referenced in function "unsigned short __cdecl boost::date_time::month_str_to_ushort<class boost::gregorian::greg_month>(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (??$month_str_to_ushort@Vgreg_month@gregorian@boost@@@date_time@boost@@YAGAEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) I’m using Qt Creator, along with Visual Studio 2015. I have the installed the windows binary of boost 1.61.1 .

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installing on a local 2 core system
by Salvador Aguiñaga 30 May '16

30 May '16

> Installing on small system I want to use for temporary development, I get the following error. > > >parallel-bgl-0.7.0/boost/property_map/property_map.hpp:16:37: fatal error: boost/pending/cstddef.hpp: No such file or directory > compilation terminated > > I've configured the system: > >"sudo apt-get install build-essential" > > And successfully installed the openmpi: "openmpi-1.10.2.tar.bz2" > > But when I get to: > /parallel-bgl-0.7.0/build/cmake .. > > I can't find a good solution online to this cstddef.hpp error. > > Any suggestions? > > > My system: uname -a > > Linux atomix 4.2.0-16-generic #19-Ubuntu SMP Thu Oct 8 14:46:51 UTC 2015 i686 i686 i686 GNU/Linux

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[proto] non-proto objects as terminals
by Igor R 30 May '16

30 May '16

I would like to use instances of a non-proto class as proto terminals for all purposes. To enable this functionality, I use is_terminal metafunction that I pass to BOOST_PROTO_DEFINE_OPERATORS(). This actually defines the operators, so the following expression makes an expression tree, as expected: non_proto_obj * proto_obj; However, I cannot do this: non_proto_obj = proto_obj; Or this: non_proto_obj[proto_obj]; While the opposite does compile: proto_obj = non_proto_obj; proto_obj[non_proto_obj]; How to solve this issue? Thanks! P.S.: here is an sscce: /////////////////// #include <iostream> #include <boost/proto/proto.hpp> #include <boost/mpl/int.hpp> namespace mpl = boost::mpl; namespace proto = boost::proto; using proto::_; template<typename Expr> struct my_expression; struct my_domain : proto::domain<proto::generator<my_expression> > {}; template<int I> struct placeholder {}; template<typename Expr> struct my_expression : proto::extends<Expr, my_expression<Expr>, my_domain> { explicit my_expression(Expr const &expr = Expr()) : my_expression::proto_extends(expr) {} BOOST_PROTO_EXTENDS_USING_ASSIGN(my_expression<Expr>) }; const my_expression<proto::terminal<placeholder<1>>::type> _1; namespace app { struct non_proto_type {}; template <typename T> struct is_terminal : mpl::false_ {}; template<> struct is_terminal<non_proto_type> : mpl::true_ {}; BOOST_PROTO_DEFINE_OPERATORS(is_terminal, my_domain) non_proto_type non_proto; } int main() { _1 = app::non_proto; // ok, builds temporary proto expression //app::non_proto = _1; // does not compile! no operator= _1[app::non_proto]; // ok //app::non_proto[_1]; // does not compile! no operator[] (+app::non_proto)[_1]; // ok! applying unary + to make a proto expression first, then operator[] is available }

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Boost.Fiber mini-review May 23 - June 1
by Nat Goodspeed 30 May '16

30 May '16

Hi all, The Boost.Fiber candidate library by Oliver Kowalke begins a mini-review today, Monday May 23, which will close Wednesday June 1. It was last reviewed in September 2015; the verdict at that time was "not yet." Oliver has been working steadily to address review comments and to improve the library in other ways, and has brought the library back for mini-review. The updated documentation is here: http://olk.github.io/libs/fiber/doc/html/index.html The code is on the master branch of this repository: https://github.com/olk/boost-fiber/tree/master I believe it is Oliver's intention to respond to review feedback on the develop branch, leaving the master branch stable during the review. I will monitor reviews and discussion on both the boost-users@ list and the boost@ developers' list. Please include at least "fiber" and "review" in the subject line of your mail, e.g. by replying to this message. (Please reply to only ONE list, however.) I will also check the Boost Library Incubator for Fiber reviews: http://rrsd.com/blincubator.com/bi_library/fiber/?gform_post_id=859 though I check that less frequently than email. Please do remember to state in your review whether you think the library should be accepted as a Boost library. Thank you for your interest and your feedback! ----------------------------------------------------- Here follows a synopsis of issues raised during the September 2015 review: Cross-thread fiber migration: Evidently the community strongly desires the ability to transfer a suspended fiber from one thread to another. Now supported, with documentation. Cross-thread migration support implies a requirement to document the thread safety requirements of the customization API. Addressed. Standard required timing specifications: meet (30.2.4 Timing specifications [thread.req.timing]). Addressed. Adapt one or more existing test suites for thread facilities to validate the correctness of the Fiber library's synchronization constructs. The requester clarified in private mail that I misstated his suggestion: he wanted Oliver to review one or more such test suites to discover the kinds of issues that can arise with thread synchronization constructs. He has professed himself satisfied with the current state of the Fiber library's synchronization constructs. std::chrono support: ensure that wait_until() can accept any supported time_point specialization. Addressed. C++11 compatibility. Addressed. Document that this_fiber::yield() (et al.) are valid from main(), or in general from a thread function, as well as from explicitly-launched fibers. Addressed. Make shared_state lock requirements explicit: for example, make mark_ready_and_notify_() accept a std::unique_lock<>& (or &&) to force its caller to provide one. Addressed. Avoid holding mutex during condition_variable::notify_*() calls. Addressed. packaged_task must not decay-copy its task arguments. Addressed. Align fibers::async() signature, result description and invoke_helper implementation with std::async(). Avoid returning std::move(...). Addressed. Wait list implementation: try an intrusive linked list of fiber_context objects. Addressed. Avoid sleeping thread when no fibers are ready -- block on external event. Better handling of waiting tasks (decentralized wait queues?). Addressed. Optimization to resume awakened fiber on the thread that awakens it. Hooks provided. Template redundancy: eliminate duplication between specializations for T, T& and void. The future, shared_future, shared_state, promise and task_object templates were specifically cited. Addressed. Leverage predicate-based condition::wait() overload internally. Addressed. Nested schedulers: make schedulers be schedulable entities themselves. Not implemented. Improve robustness of `promise' handling in Asynchronous Callbacks documentation. Avoid overconfident remarks about it. Addressed. Fix Note overstating the requirements on condition_variable::wait(). Addressed.

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[test] how to test std::pair with BOOST_TEST
by Tan, Tom (Shanghai) 29 May '16

29 May '16

The following snippet does not compile with VS2015 and boost 1.61. What should the correct way to do it? Thanks. // compile with cl.exe /EHSc #define BOOST_TEST_MODULE pair #include <boost/test/included/unit_test.hpp> std::pair<uint32_t, uint32_t> v() { return std::make_pair(0, 0); } BOOST_AUTO_TEST_CASE(range) { BOOST_TEST(std::make_pair(0, 0) == v()); } Here's the error message: C:\3rd\boost_1_61_0\boost/test/tools/assertion.hpp(163): error C2678: binary '==': no operator found which takes a left-hand operand of type 'std::pair<int,int>' (or there is no acceptable conversion) C:\3rd\boost_1_61_0\boost/function/function_base.hpp(740): note: could be 'bool boost::operator ==(boost::detail::function::useless_clear_type *,const boost::function_base &)' C:\3rd\boost_1_61_0\boost/function/function_base.hpp(728): note: or 'bool boost::operator ==(const boost::function_base &,boost::detail::function::useless_clear_type *)' C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\exception(329): note: or 'bool std::operator ==(const std::exception_ptr &,const std::exception_ptr &) throw()' [found using argument-dependent lookup] C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\exception(334): note: or 'bool std::operator ==(std::nullptr_t,const std::exception_ptr &) throw()' [found using argument-dependent lookup] C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\exception(339): note: or 'bool std::operator ==(const std::exception_ptr &,std::nullptr_t) throw()' [found using argument-dependent lookup] C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\system_error(365): note: or 'bool std::operator ==(const std::error_code &,const std::error_code &) noexcept' [found using argument-dependent lookup] C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\system_error(373): note: or 'bool std::operator ==(const std::error_code &,const std::error_condition &) noexcept' [found using argument-dependent lookup] C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\system_error(381): note: or 'bool std::operator ==(const std::error_condition &,const std::error_code &) noexcept' [found using argument-dependent lookup] C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\system_error(389): note: or 'bool std::operator ==(const std::error_condition &,const std::error_condition &) noexcept' [found using argument-dependent lookup] C:\3rd\boost_1_61_0\boost/function/function_base.hpp(799): note: or 'bool boost::operator ==<T>(Functor,const boost::function_base &)' with [ T=std::pair<int,int>, Functor=std::pair<int,int> ] C:\3rd\boost_1_61_0\boost/function/function_base.hpp(790): note: or 'bool boost::operator ==<T>(const boost::function_base &,Functor)' with [ T=std::pair<uint32_t,uint32_t>, Functor=std::pair<uint32_t,uint32_t> ] C:\3rd\boost_1_61_0\boost/test/tools/assertion.hpp(163): note: while trying to match the argument list '(std::pair<int,int>, std::pair<uint32_t,uint32_t>)' C:\3rd\boost_1_61_0\boost/test/tools/assertion.hpp(326): note: see reference to class template instantiation 'boost::test_tools::assertion::op::EQ<ValType,T,void>' being compiled with [ ValType=std::pair<int,int>, T=std::pair<uint32_t,uint32_t> ] s.cpp(14): note: see reference to class template instantiation 'boost::test_tools::assertion::binary_expr<ExprType,std::pair<uint32_t,uint32_t>,boost::test_tools::assertion::op::EQ<ValType,T,void>>' being compiled with [ ExprType=boost::test_tools::assertion::value_expr<std::pair<int,int>>, ValType=std::pair<int,int>, T=std::pair<uint32_t,uint32_t> ] C:\3rd\boost_1_61_0\boost/test/tools/assertion.hpp(377): warning C4624: 'boost::test_tools::assertion::binary_expr<ExprType,std::pair<uint32_t,uint32_t>,boost::test_tools::assertion::op::EQ<ValType,T,void>>': destructor was implicitly defined as deleted with [ ExprType=boost::test_tools::assertion::value_expr<std::pair<int,int>>, ValType=std::pair<int,int>, T=std::pair<uint32_t,uint32_t> ]

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Call for Papers for Meeting C++ 2016 ends on Friday night!
by Jens Weller 25 May '16

25 May '16

Hello Boost Community! a short reminder, that the deadline is coming up for submitting your talk to this years Meeting C++ conference! Meeting C++ 2016 Page: http://meetingcpp.com/index.php/mcpp2016.html Talk submission page: https://meetingcpp.com/mcpp/submittalk/ thanks, Jens Weller

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File-mapped shared memory access through Boost interprocess is slow on some HPC file-systems due to mmap
by Scott Ritchie 24 May '16

24 May '16

Hi all, I'm wondering if there is some way to use the Boost interprocess library without the use of mmap for file I/O? I have developed an R-language package that uses another third party package (bigmemory) to access objects in shared memory when parallelising R across multiple cores. This third party package uses the Boost interprocess library to make these file-backed shared memory objects available to R. This worked perfectly, until I tested my package on a multi-node cluster. After some digging I found that the code calling these shared memory objects was extremely slow, and had hugely variable runtimes. Accessing these shared memory objects became exponentially slower as I parallelised over more and more cores. After talking to the authors of the bigmemory library and the administrators of the cluster, we have determined the route cause to be the use of mmap() on that particular filesystem (GPFS). On this filesystem, mmap() performs concurrency checking on every read and write since the filesystem is shared across multiple physical nodes. Marking the shared memory segments as read_only did not solve the issue. The advice of the cluster administrators is to not use mmap() for file I/O. I'm hoping there is a simple fix, such as a compilation flag I can provide to boost to use some alternative file I/O function/library? If not I will need to rewrite my code so that it is multi-threaded instead of multi-process without the use of Boost. Kind regards, --- Scott Ritchie, Ph.D. Student | Integrative Systems Biology | Pathology | http://www.inouyelab.org The University of Melbourne ---

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[Parallel Boost Graph Library] General Questions and Redistribution Questions
by Jun Kudo 24 May '16

24 May '16

Hi everyone, I've been playing around with the Parallel Boost Graph Library in hopes of using it for a distributed mesh with redistribution capabilities. Unfortunately, I've been having a lot of issues and I was hoping to get some clarification from the community on some points. I am trying to construct a distributed graph that represents a mesh. The idealized plan is to use this library to create a mesh class that allows for the easy introduction of new vertices and edges as well as repartitioning/data migration capabilities. For this effort, I created a simple struct called Cell that is attached as an interior vertex property and identified the cell id value as the key for indexing. I've attached a short program to really quickly demonstrate what I've been trying to prototype. At this point, I have some questions regarding some things about the library that I can't seem to figure out. 1. How do you control the initial distribution of the names? That is, how do you control which processes own what vertex names when you dynamically add named vertices? 2. How do you create a VertexProcessorMap to use with the redistribution function? The test adjlist_redist_test.cpp looks like it creates a property_map of the vertex_rank but I'm not sure how to do something similar when I have named graph. 3. Is there any way and any point to accomplish what I'm trying to do without using named graphs? I started down this route because the referenced test did not use named graphs. I quickly ran into a situation where I did not know how to grab a vertex descriptor for an off-process vertex without using the vertex(vertices_size_type n, const adjacency_list& g) function or without knowing a priori where that vertex lived. Similar to the named graph situation, I want to be able to dynamically add numbered vertices (which according to the documentation invalidates the use of vertex()) on different processes and then define edges between them based on these numbers. Does the fact that I'm trying to use a global numbering system as a name convention make this question silly? Sorry about the wall of text and I hope my questions are not too nonsensical! Thanks in advance for all the help. Sincerely, Jun

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Rebooting Boost: Call for Lightning Talks @ CppCon
by Niall Douglas 23 May '16

23 May '16

At C++ Now a number of informal meetings showed there to be frustrations with the current ecosystem around the Boost C++ Libraries (to paraphrase a founder of Boost, "Boost is supposed to serve *the entire C++ community; it isn't Boost's goal to serve Boost's community*". Recent and recurrent boost-dev discussions have raised the lack of cmake based tooling; lack of ABI management and the consequent ODR violation when mixing Boost versions in the same process; the anti-social behaviour of Boost towards library end users, new ideas, new blood and the wider C++ community; and the chronic lack of maintenance of up to half the Boost libraries. One question which needs to be answered is whether a clean reboot of Boost from the first principles of proving high quality C++ libraries well suited for use with the latest C++ standard is viable. This new collection of C++ libraries would be started completely from scratch (even if some existing libraries were ported into the new organisation), so ANYTHING is possible. All we need is a critical mass of library developers willing to collaborate on developing a shared infrastructure mutually beneficial to all participants, whether library developer or library end user. To that end of discovering if this critical mass is there, five minute lightning talk topics are requested for CppCon this September on this topic: "What design pattern, practice or idiom should a standards aspiring collection of C++ 14/17 libraries share?" Please keep each talk topic focused on a single design pattern, practice or idiom (see suggested talk format below). Each speaker may submit up to THREE talk topics (not all may be accepted if there are a lack of slots, so please rank them in order of preference). Please send your talk topics to me privately by email, only if sufficient numbers present to fill a session will your name and your talk topic be shared with the CppCon Programme Committee. We'll try to arrange a short panel session at the end so attendees can ask questions of the speakers. After the lightning talk we'll arrange a restaurant so all the speakers and any interested attendees can dine together, followed by a night in a Bellevue bar. If after the dust has settled it is felt there is a critical mass sufficient to reboot a brand shiny new edition of Boost, we'll start development! I should *stress* that it is up to the CppCon Programme Committee whether these lightning talks are approved or not. I'll just copy and paste your proposed talk to the CppCon PC as-is. If insufficient lightning talk topics are received by me to fill a 60 minute session, I'll withdraw this talk proposal from CppCon. Suggested talk format ================ Five minutes is not much time, so here is a suggested lightning talk outline: 1. A current widely practiced library design pattern (show example). 2. The problems it generates for library users or maintainers. 3. Your proposed alternative design pattern (show example). 4. The problems the alternative design pattern fixes. 5. Any mockup, prototype or even live demo (!) of the alternative design pattern in action. Suggested talk themes might be documentation, packaging, distribution, testing, tooling, quality assessment, barriers to entry, governance, strategy, important gaps in the standard libraries, automation and deprecation/removal policies. Here is an example of such a lightning talk: 1. Current design pattern: Library v1.00: namespace boost { namespace lib { void foo(size_t, char); } } User code: boost::lib::foo(100, 'n'); 2. Problem: Library v1.01: namespace boost { namespace lib { void foo(char, size_t); } } User code: boost::lib::foo(100, 'n'); // oh oh! 3. Alternative: Library v1.00: namespace boost { namespace lib { inline namespace v100 { void foo(size_t, char); } } } #define BOOST_LIB_NAMESPACE_V100 boost::lib::v100 Library v1.01: namespace boost { namespace lib { inline namespace v101 { void foo(char, size_t); } } } #define BOOST_LIB_NAMESPACE_V101 boost::lib::v101 User code: // Mount v100 of Boost.Lib into "lib" namespace lib=BOOST_LIB_NAMESPACE_V100; lib::foo(100, 'n'); // ABI stable! No ODR violation possible! 4. Problems fixed: a) Mixing incompatible versions of individual Boost libraries in the same process (or even translation unit) is now safe. b) Libraries can now depend on other libraries without worrying about breaking code which depends on them which uses a different version of the same dependency. This greatly helps reduce change ripple effects. c) Forward compatibility or alternative implementation shims are now very easy to implement e.g. library users can externally configure either Boost.Filesystem or std::experimental::filesystem for your library to use, your code simply refers to _some_ Filesystem TS implementation e.g. namespace filesystem = FILESYSTEM_TS_IMPLEMENTATION; filesystem::path mypath; -- ned Productions Limited Consulting http://www.nedproductions.biz/ http://ie.linkedin.com/in/nialldouglas/

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How to write one property page .props to select the right x86 or x64 Boost libraries folder automatically using Visual Studio
by Paul A. Bristow 22 May '16

22 May '16

I have downloaded the shiny new release boost_1_61_0_b1 and am trying to set up so that I can test a lot of Boost-ish console applications using both 32 and 64-bit. This is easier with bjam, but I'd like to use the Visual studio IDE too. I'd like a single property page that can be placed in the same folder as my .sln file and added to each and every project. (or better, made the default for all projects). I have a I:\boost_1_61_0_b1; as the include directory, and that is common to all configurations and platforms. But the libraries files are in two separate folders because the name does not yet include the platform :-( Linking to lib file: libboost_chrono-vc140-mt-gd-1_61.lib lib32-msvc-14.0 and lib64-msvc-14.0 Googling gives some suggestions to select the right folder for libraries, but I wonder if anyone has found a slick solution? (I'll edit the property xml if necessary - it would seem that the IDE GUI tool isn't up to the job?) Paul --- Paul A. Bristow Prizet Farmhouse Kendal UK LA8 8AB +44 (0) 1539 561830

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Windows 10 and VC14, fixing C2117 error when using Asio.
by Andrew Maclean 21 May '16

21 May '16

If you find that when using Asio in Windows 10 with the Windows 10 SDK and Visual Studio 2015 you get lots of C2177 errors in winnt.h and sdkdkver.h then this should fix it: Essentially, just add: #define WINVER 0x0A00 #define _WIN32_WINNT 0x0A00 before any header that includes SDKDDKVer.h either directly or indirectly. If using CMake, then in the CMakeLists.txt file just add these lines: if(WIN32) add_definitions(-DWINVER=0x0A00) add_definitions(-D_WIN32_WINNT=0x0A00) endif() The fix is documented at https://msdn.microsoft.com/en-us/library/6sehtctf.aspx I hope this helps others. Regards Andrew -- ___________________________________________ Andrew J. P. Maclean ___________________________________________

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