March 2013 - Boost-users - lists.preview.boost.org

Boost.Interprocess accessing an unordered_map in shared memory.
by lazylabs＠gmail.com 12 Mar '13

12 Mar '13

Hi, I am trying to create a unordered_map in shared memory using Boost Interprocess library. Here, is the code, which I'm trying to use (taking examples from Boost Interprocess documentation): #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <functional> #include <boost/functional/hash.hpp> #include <boost/unordered_map.hpp> #include <iostream> #include <string> #include <boost/interprocess/containers/string.hpp> namespace bipc = boost::interprocess; typedef bipc::allocator<char, bipc::managed_shared_memory::segment_manager> CharAllocator; typedef bipc::basic_string<char, std::char_traits<char>, CharAllocator> ShmemString; struct Person { int age; ShmemString name; double salary; Person(int i, double sal, const char* s, const char_allocator& a) : age(i), name(s, a), salary(sal) { } void print() {} } typedef ShmemString KeyType; typedef Person MappedType; typedef std::pair< KeyType, MappedType > MapPersonType; typedef bipc::allocator< MapPersonType, bipc::managed_shared_memory::segment_manager > ShMemAllocator; typedef boost::unordered_map< KeyType, MappedType, boost::hash<KeyType>, std::equal_to<KeyType>, ShMemAllocator > PersonMap; In the main reader program, I create a map in the shared memory and I insert an object in this map: int main() { bipc::managed_shared_memory segment(bipc::create_only, "MySharedMemory", 65536); PersonMap *persons = segment.construct<PersonMap>("MyHashMap") ( 3, boost::hash<ShmemString>(), std::equal_to<ShmemString>() , segment.get_allocator<MapPersonType>()); char_allocator alloc(segment.get_allocator<char>()); Person p1(20, 10000, "ABC", alloc); persons->insert(MapPersonType(ShmemString("Person1", alloc), p1)); } However, when I am trying to access the map in the reader program, I need to use a syntax like persons->at(ShmemString("H", segment.get_allocator<char>())).print(); However, I would prefer to do this with a std::string, which results in compilation errors: persons->at(std::string("H")).print(); Is it possible to write the above statement, i.e. accessing the map allocated in shared memory with std::string? Thanks.

3 4

Using SSL
by ustulation 11 Mar '13

11 Mar '13

Hello. this will be the first time i'll be writing an SSL and am using boost::asio::ssl. I've gone through the articles over the net and somewhat understand how ssl works. I've created 3 files at server end as of now: privateKey.pem, unsignedCertificate.csr and signedCertificate.pem. I used the server's privateKey.pem to sign the certificate (hence the generated 3rd file). Hence Server itself is a Certification Authority in this case (CA). Now what i understand from theory is: <1> During handshake client will request server's certificate. <2> on reception the client must verify if the ceritficate is signed by the mentioned trusted Certification Authority (CA) in the certificate. Since CA will have used a private key to sign the certificate client will need CA's public key stored somewhere on its machine. Use that public key file to verify that mentioned CA did indeed sign it. <3> if it is, then verify the certificate as a whole. In my case, the server had used it's own private key to self-sign the certificate. questions: <1> if CA was one of the trusted third parties the O.S would have stored it's public key in default locations. In that case i guess all i needed was ssl::context::set_default_verify_paths() and boost would have used all files there to match against the CA and use its public key. In this case however i need Server's public key file. Am i right? How do i get that (server's public key)? Do i use one of the 3 files above at the client end too? Is it load_verify_file("..") that i need to call pointing to server's public key? <2> context::set_verify_callback : does this get called during handshake? The handler must return bool. Suppose i return false, who will check it and what will it do? What i am guessing is: handshake -> blocks and runs a pre-verification test -> calls the supplied handler -> if handler returns true, handshake is successful otherwise either the handshake throws or fills the error code with non-zero value depending on what flavour of handshake(...) was called. Is this correct? <3> if i use ssl::rfc2818_verification("hostname") as verify_callback handler, what do i pass in place of hostname if there is no hostname (ie., i only know the server ip address). <4> do i have to use chain of files in this case? Because the server would just send one certificate file - the one that is signed right? -- View this message in context: http://boost.2283326.n4.nabble.com/Using-SSL-tp4644012.html Sent from the Boost - Users mailing list archive at Nabble.com.

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[graph][parallel] Problem distributed property map synchronization
by bminano 11 Mar '13

11 Mar '13

Hello, I need help. I have a distributed graph with a distributed property map for an edge value. The problem is that the synchronize procedure does not synchronize my ghost edges values. I have a loop that reads from the property, synchronizes, modifies its value and synchronizes it. What I see is that the value is not being synchronized for the ghost edges. for (int t = 0; t < 2; t++) { myfile<<rank<<":Time "<<t<<endl; BGL_FORALL_VERTICES(v, g, Graph) { for (boost::tie(ei_i,edge_end_i) = in_edges(v, g); ei_i != edge_end_i; ++ei_i) { remote_key_e k(rank, *ei_i); myfile<<"value "<<d_index[source(*ei_i, g)]<<" -> "<<d_index[target(*ei_i, g)]<<" valor "<<get(d_ecash, k)<<endl; } } synchronize(d_ecash); BGL_FORALL_VERTICES(v, g, Graph) { for (boost::tie(ei,edge_end) = out_edges(v, g); ei != edge_end; ++ei) { remote_key_e k(rank, *ei); put(d_ecash, k, t + 1); } } synchronize(d_ecash); } Could anyone tell me what I am doing wrong? I attach the full code if someone want to look at them. <nabble_a href="sync.cpp">sync.cpp -- View this message in context: http://boost.2283326.n4.nabble.com/graph-parallel-Problem-distributed-prope… Sent from the Boost - Users mailing list archive at Nabble.com.

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[Graph][parallel] Scale-free graph generator without self-loops
by bminano 11 Mar '13

11 Mar '13

Hello, Does anyone knows if there is possible to generate a scale-free graph that does not generate self-loops (edges with the same vertex for source and target)? I am using the unique_rmat_iterator, but it generates some self-loops. I could remove them, but for the graph remains inconsistent because of a bug. I will apreciate your help. -- View this message in context: http://boost.2283326.n4.nabble.com/Graph-parallel-Scale-free-graph-generato… Sent from the Boost - Users mailing list archive at Nabble.com.

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can't get first example in boost tutorial to work
by 7stud 11 Mar '13

11 Mar '13

I'm trying to install boost on mac osx 10.4.7. I followed the tutorial "Getting Started on Unix Variants" found here: http://www.boost.org/doc/libs/1_35_0/ more/getting_started/unix-variants.html Following the instructions in the tutorial, I installed boost in /usr/local as instructed, so my directory structure is: /usr/local/boost_1_34_1/boost But when I run the first example in the tutorial: #include <boost/lambda/lambda.hpp> #include <iostream> #include <iterator> #include <algorithm> int main() { using namespace boost::lambda; typedef std::istream_iterator<int> in; std::for_each(in(std::cin), in(), std::cout << (_1 * 3) << " " ); } I get the error(among others): error: boost/lambda/lambda.hpp: No such file or directory If I change the include path to: #include </user/local/boost_1_34_1/boost/lambda/lambda.hpp> I get the error(among others): error: boost/lambda/core.hpp: No such file or directory But core.hpp is in the lambda directory: /usr/local/boost_1_34_1/boost/lambda$ ls algorithm.hpp control_structures.hpp lambda.hpp bind.hpp core.hpp loops.hpp casts.hpp detail numeric.hpp closures.hpp exceptions.hpp switch.hpp construct.hpp if.hpp I'm using the Xcode 2.4 IDE to run my C++ programs. I also tried to execute the program from the command line with the original include path: #include <boost/lambda/lambda.hpp> but I get the same error: ~/2testing/dir1$ g++ prog1.cpp prog1.cpp:1:35: error: boost/lambda/lambda.hpp: No such file or directory prog1.cpp: In function 'int main()': prog1.cpp:8: error: 'boost' has not been declared prog1.cpp:8: error: expected namespace-name before ';' token prog1.cpp:8: error: '<type error>' is not a namespace prog1.cpp:11: error: '_1' was not declared in this scope I get the same errors again with the full include path: #include </user/local/boost_1_34_1/boost/lambda/lambda.hpp> $ g++ prog1.cpp In file included from prog1.cpp:1: /usr/local/boost_1_34_1/boost/lambda/lambda.hpp:14:33: error: boost/lambda/core.hpp: No such file or directory /usr/local/boost_1_34_1/boost/lambda/lambda.hpp:21:52: error: boost/lambda/detail/operator_actions.hpp: No such file or directory /usr/local/boost_1_34_1/boost/lambda/lambda.hpp:22:61: error: boost/lambda/detail/operator_lambda_func_base.hpp: No such file or directory /usr/local/boost_1_34_1/boost/lambda/lambda.hpp:23:63: error: boost/lambda/detail/operator_return_type_traits.hpp: No such file or directory /usr/local/boost_1_34_1/boost/lambda/lambda.hpp:26:45: error: boost/lambda/detail/operators.hpp: No such file or directory /usr/local/boost_1_34_1/boost/lambda/lambda.hpp:30:46: error: boost/lambda/detail/member_ptr.hpp: No such file or directory prog1.cpp: In function 'int main()': prog1.cpp:8: error: 'boost' has not been declared prog1.cpp:8: error: expected namespace-name before ';' token prog1.cpp:8: error: '<type error>' is not a namespace prog1.cpp:11: error: '_1' was not declared in this scope What path should I be using? Or, should I set an environment variable somewhere?

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adjacency matrix subgraph enumeration
by headupinclouds 09 Mar '13

09 Mar '13

What is the best way in boost to enumerate all connected subgraphs of an adjacency matrix? I know in advance that all nodes of the graph are connected and that it is cyclic. For the following graph: (0 <-> 1) (1 <-> 2) (2 <-> 3) (3 <-> 0) I want to enumerate the node list of all unique connected subgraphs: (0, 1) (0, 1, 2) (0, 1, 2, 3) (1, 2) (1, 2, 3) (2, 3) (0, 3) (0, 3, 2) -- View this message in context: http://boost.2283326.n4.nabble.com/adjacency-matrix-subgraph-enumeration-tp… Sent from the Boost - Users mailing list archive at Nabble.com.

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is_foo_type naming rule
by Niitsuma Hirotaka 09 Mar '13

09 Mar '13

There are two type is_foo_type functor For example is_double can be --------- template<typename T> struct is_double_template : boost::is_same<T,double> {}; --------- or --------- struct is_double_runtime { template<typename T> bool operator()(T x){return false;} bool operator()(double x){return true;} }; --------- Are there any standard naming rule distinguish these functor? is_foo_runtime is_foo_compiletime ? The compile-time functor can convert to runtime factor using : --------- template<typename IsTemplateMplLambda> struct is_templated_type_to_runtime { typedef struct is_templated_type_runtime { template<typename T> bool operator()(T) { return boost::mpl::apply<IsTemplateMplLambda,T>::type::value; } } type; }; --------- usage --------- typedef boost::mpl::lambda<is_double_template<boost::mpl::_1 > >::type is_double_mpl_lambda; double x=1.1; int i=2; is_templated_type_to_runtime<is_double_mpl_lambda>::type is_double_runtime_object; std::cout << is_double_runtime_object(x) << std::endl; std::cout << is_double_runtime_object(i) << std::endl; ---------

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newbie needs help with a linker problem
by Phil Huffman 09 Mar '13

09 Mar '13

Hello, I just installed Boost and GMP on my Mac, using all defaults. I want to use GMP via Boost, but there is a problem with the linker. I'm sure that clang is getting a bit lost looking for GMP's object modules. Any help will be gratefully accepted. Thanks. When I compile the below program: #include <boost/multiprecision/gmp.hpp> using namespace boost::multiprecision; int main() { mpz_int v = 1; for (unsigned i = 1; i <= 1000; ++i) { v *= i; } std::cout << "1000! = " << v << std::endl; // prints 1000! return 0; } using this command: c++ -I /usr/local/boost_1_53_0 mpz1.cpp -o mpz1 -v I get this: Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn) Target: x86_64-apple-darwin12.2.0 Thread model: posix "/usr/bin/clang" -cc1 -triple x86_64-apple-macosx10.8.0 -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name mpz1.cpp -pic-level 1 -mdisable-fp-elim -relaxed-aliasing -masm-verbose -munwind-tables -target-cpu core2 -target-linker-version 134.9 -v -resource-dir /usr/bin/../lib/clang/4.1 -I /usr/local/boost_1_53_0 -fmodule-cache-path /var/folders/hj/zc5pjqjd6gxgq2sw77xghkyh0000gn/T/clang-module-cache -fdeprecated-macro -fdebug-compilation-dir /Users/56phil/Dev/boostTest -ferror-limit 19 -fmessage-length 272 -stack-protector 1 -mstackrealign -fblocks -fobjc-runtime-has-arc -fobjc-runtime-has-weak -fobjc-dispatch-method=mixed -fobjc-default-synthesize-properties -fcxx-exceptions -fexceptions -fdiagnostics-show-option -fcolor-diagnostics -o /var/folders/hj/zc5pjqjd6gxgq2sw77xghkyh0000gn/T/mpz1-KE6NKq.o -x c++ mpz1.cpp clang -cc1 version 4.1 based upon LLVM 3.1svn default target x86_64-apple-darwin12.2.0 ignoring nonexistent directory "/usr/include/c++/4.2.1/i686-apple-darwin10/x86_64" ignoring nonexistent directory "/usr/include/c++/4.0.0" ignoring nonexistent directory "/usr/include/c++/4.0.0/i686-apple-darwin8/" ignoring nonexistent directory "/usr/include/c++/4.0.0/backward" #include "..." search starts here: #include <...> search starts here: /usr/local/boost_1_53_0 /usr/include/c++/4.2.1 /usr/include/c++/4.2.1/backward /usr/local/include /usr/bin/../lib/clang/4.1/include /usr/include /System/Library/Frameworks (framework directory) /Library/Frameworks (framework directory) End of search list. "/usr/bin/ld" -demangle -dynamic -arch x86_64 -macosx_version_min 10.8.0 -o mpz1 /var/folders/hj/zc5pjqjd6gxgq2sw77xghkyh0000gn/T/mpz1-KE6NKq.o -lstdc++ -lSystem /usr/bin/../lib/clang/4.1/lib/darwin/libclang_rt.osx.a Undefined symbols for architecture x86_64: "___gmp_get_memory_functions", referenced from: boost::multiprecision::backends::gmp_int::str(long, std::_Ios_Fmtflags) const in mpz1-KE6NKq.o "___gmpz_clear", referenced from: boost::multiprecision::backends::gmp_int::~gmp_int() in mpz1-KE6NKq.o "___gmpz_get_str", referenced from: boost::multiprecision::backends::gmp_int::str(long, std::_Ios_Fmtflags) const in mpz1-KE6NKq.o "___gmpz_init", referenced from: boost::multiprecision::backends::gmp_int::operator=(long) in mpz1-KE6NKq.o boost::multiprecision::backends::gmp_int::gmp_int() in mpz1-KE6NKq.o "___gmpz_mul_ui", referenced from: boost::multiprecision::backends::eval_multiply(boost::multiprecision::backends::gmp_int&, unsigned long) in mpz1-KE6NKq.o "___gmpz_set_si", referenced from: boost::multiprecision::backends::gmp_int::operator=(long) in mpz1-KE6NKq.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)

2 1

building with iostreams and a non-standard zlib location
by James Amundson 09 Mar '13

09 Mar '13

Hi, I'm trying to do a bjam build of boost packages including iostreams. I have zlib installed under /unusual/location ./bjam include=/unusual/location/include install fails because it cannot find -lz. Obviously, I need to specify that libz is in /unusual/location/lib, but I don't see how to do that. I realize this seems obvious. Which part of the documentation am I missing? Thanks, Jim Amundson

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VS2012 C4503 warning (decorated name length exceeded, name was truncated) with boost 1.52
by legalize+jeeves＠mail.xmission.com 08 Mar '13

08 Mar '13

[Please do not mail me a copy of your followup] I'm using boost 1.52. If you see this thread on stack overflow: <http://stackoverflow.com/questions/9669071/warning-c4503-when-using-pragma-…> You'll see a comment down at the bottom where someone has increased the warning level for their project and they are getting tons of these C4503 warnings when using boost includes. I have verified on my project that if I don't change the warning level and don't specifically disable this warning project-wide, then including using boost in my project does not generate the warning. However, if I increase the warning level beyond the default, to 3 in my case whereas the poster on stack overflow had used 4, then I get the warning. I, like the commenter on stack overflow, would like to know if there's a boost-friendly way to tell boost to disable the warning for boost headers where the boost authors have decided it's innocuous, while still retaining the high warning setting for my own code. Any suggestions? Thanks in advance. -- "The Direct3D Graphics Pipeline" free book <http://tinyurl.com/d3d-pipeline> The Computer Graphics Museum <http://computergraphicsmuseum.org> The Terminals Wiki <http://terminals.classiccmp.org> Legalize Adulthood! (my blog) <http://legalizeadulthood.wordpress.com>

2 2

Scale-free networks generation
by davidrey123 08 Mar '13

08 Mar '13

Hello, I would to use Boost librairies to generate scale-free networks and I am not sure what is the best approach. I am currently using the PLOD generator, but the graphs generated are generally multigraphs, that is, graphs with multiple edges between two nodes. Although I would like to generate graphs with bidirectionnal edges between nodes, I also would like to bound the maximum number of possible edges between a pair of nodes to 2. In other words, if edges (i,j) and (j,i) are generated between nodes i and j, I do not want any additional edge between those nodes to be generated. Hence, I would like to know; 1-Is it possible to generate such graphs using the PLOD generator? If it is, do I need to remove "multi-edges" after the graph is generated or is there a smarter way to do so? 2-If using the PLOD generator is not the best option, is there any other random graph generator in Boost that can be adapted to design scale-free networks? In particular, is there a graph generator implementing the Barabasi-Albert model (I have looked up the forum for an answer to that question and it seems that the answer is "no", but things may have changed since)/ 3-I read somewhere that Compressed Sparse Row (CSR) graphs could be used to represent scale-free networks, is there a way to use the corresponding Boost class to do so? Thank you, -David -- View this message in context: http://boost.2283326.n4.nabble.com/Scale-free-networks-generation-tp4643888… Sent from the Boost - Users mailing list archive at Nabble.com.

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[type traits / MPL] check whether a class has a certain member function
by Stefan Strasser 08 Mar '13

08 Mar '13

Hi, I'm looking for a boost functionality to determine whether a given type has a member function of a given name (or name + signature). this seems to be possible using SFINAE, but all I can find is BOOST_MPL_HAS_XXX_TRAIT_DEF which only works for nested types, not functions. I could of course implement it myself using SFINAE but BOOST_MPL_HAS_XXX_TRAIT_DEF has a lot of compiler bug workarounds it seems, so I guess this will cause problems. Is there such a functionality in boost? I want to use it to determine the defaults of a traits class, similar to C++11 pointer_traits::difference_type. But the determining factor for the default is a function in my case, not a type. Thanks

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Using BOOST_*_EQUAL on bit-fields?
by Chris Cleeland 07 Mar '13

07 Mar '13

I'm using the Boost Unit Test Framework and have a struct with bitfields declared in it. When I compile a unit test with code like this StructWithBitfields mystruct; StructWithBitfields otherstruct; BOOST_CHECK_EQUAL(mystruct.bitfield, otherstruct.bitfield); I get a compiler errors error: non-const reference cannot bind to bit-field 'bitfield' referring to both arguments to the macro. Is there a preferred way for comparing bitfield values via unit test macros? -- Chris Cleeland

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Boost.Function compile error
by gast128 07 Mar '13

07 Mar '13

Dear all, i got a compilation error with vstudio 2010 and Boost.Function: 1) pass functor in constructor 2) pass functor as assignment 3) use Boost.Ref 4) temporary function void foo() { std::identity<int> bla; boost::function<int (int)> fc(bla); boost::function<int (int)> fc2 = bla; boost::function<int (int)> fc(boost::ref(bla)); boost::function<int (int)>(bla); //<-- } first 3 are ok, but the last one vstudio sees this as redefintion of bla of type 'boost::function<int (int)>. What (and why) do I wrong or should use an explicit cast in the last case?

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Re: [Boost-users] asio: async ops in multithreading environment
by Marat Abrarov 06 Mar '13

06 Mar '13

> 1) One thread issues scatter-gather boost::asio::async_write() for > boost::array<boost::asio::const_buffer, 2> on socket A. > 2) Another thread closes socket A after that. > 3) Meantime (simultaneously with 2), first buffer write is completed and > one of the threads running io_service::run() starts to execute second part > of async_write from 1). > > The problem is: second write which is issued internally by boost cannot be > protected by the same mutex which is used for protected access to the > socket in my code. At first, RTFM: 1. http://www.boost.org/doc/libs/1_53_0/doc/html/boost_asio/reference/Handler.h tml ~~~~~~~~~~~~~~ asio_handler_invoke(f, &h); ~~~~~~~~~~~~~~ 2. http://www.boost.org/doc/libs/1_53_0/doc/html/boost_asio/overview/core/stran ds.html ~~~~~~~~~~~~~~ In the case of composed asynchronous operations, such as async_read() or async_read_until(), if a completion handler goes through a strand, then all intermediate handlers should also go through the same strand. This is needed to ensure thread safe access for any objects that are shared between the caller and the composed operation (in the case of async_read() it's the socket, which the caller can close() to cancel the operation). This is done by having hook functions for all intermediate handlers which forward the calls to the customisable hook associated with the final handler: ~~~~~~~~~~~~~~ Than google some more: 3. https://github.com/boostcon/2011_presentations/raw/master/mon/thinking_async hronously.pdf See template <class Handler> struct mutex_wrapper at page 95. 4. http://asio-samples.blogspot.ru/2011/06/design-journeys-with-asio.html Sorry, it's in Russian. Regards, Marat Abrarov.

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icu libraries renamed in icu-50-*
by koala01 06 Mar '13

06 Mar '13

Hello, I just have compiled a personnal build of mingw-w64 (gcc 4.8) and different extern libraries, as icu-50.1.2 (the last release of that library) on windows vista When trying to compile boost (1-53-0), it appears that icu is not found, due to following name changes in icu: * icudata library is now named icudt * icui18n library is now named icuin (i dont know if those change are recent or not :S) We can, of course, provide a copy of those libraries with the correct / needed names, but shouldn't it better to make a conditionnal choice on the icu version to know if we have to use one or other name, to ensure that icu would be correctly detected ? I expect that such test should simply take place in a jamfile or in another, am i wrong?

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1.53, Bjam fails when adding arguments [Beginner]
by wespaugh 06 Mar '13

06 Mar '13

I'm trying to build 1.53 for use with an android platform, using some configuration code provided kindly provided by one of the community. (Android shouldn't be relevant to the problem, but it seemed noteworthy). My user-config.jam is: import os ; if [ os.name ] = CYGWIN || [ os.name ] = NT { androidPlatform = windows ; } androidNDKRoot = /cygdrive/c/Android/android-ndk-r8d ; using gcc:android:$(androidNDKRoot)/toolchains/arm-linux-androideabi/prebuilt/$(androidPlatform)/bin/arm-linux-androideabi-g++ <compileflags>--sysroot=$(androidNDKRoot)/platforms/android-8/arch-arm/ <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/gnu-libstdc++/4.7/include <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/gnu-libstdc++/4.7/libs/armeabi/include <archiver>$(androidNDKRoot)/toolchains/arm-linux-androideabi-4.7/prebuilt/$(androidPlatform)/bin/arm-linux-androideabi/ar <ranlib>$(androidNDKRoot)/toolchains/arm-linux-androideabi-4.7/prebuilt/$(androidPlatform)/bin/arm-linux-androideabi-ranlib ; And I am trying to build with the following command: b2 release --with-serialization --with-thread --with-date_time --with-system --with-filesystem --layout=system threading=multi link=static runtime-link=static toolset=gcc-android target-os=linux threadapi=pthread stage When I try to run, however, I get .../user-config.jam:109: in modules.load *** argument error * rule using ( toolset-module : * ) * called with: ( gcc:android:/cygdrive/c/Android/android-ndk-r8d/toolchains/arm-linux-androideabi/prebuilt/windows/bin/arm-linux-androideabi <compileflags>--sysroot=/cygdrive/c...{Rest of my compiler flags go here} * extra argument <compileflags>--sysroot=/cygdrive/c/Android/android-ndk-r8d/...{Rest of my compiler flags go here} /{...}/build/project.jam:886: see definition of rule 'using' being called /{...}/build-system.jam:257: in load-config /{...}/build-system.jam:399: in load-configuration-files /{...}/build-system.jam:555: in load /{...}/kernel/modules.jam:284: in import /{...}/kernel/bootstrap.jam:142: in boost-build /{...}/boost-build.jam:8: in module scope >From what I can tell, it doesn't like something about how my compile flags are passed in. I found some documentation on boost.org suggesting that the proper way to define them is like this: compileflags="--sysroot=/cygdrive/c/Android/{...}/ -I$(androidNDKRoot)/toolchains/{...} etc" But that gave me the same error. There's a strong chance that this is in TFM somewhere I just need to R. If so, I apologize, because I cannot find the manual. I would greatly appreciate any assistance in finding where to learn what I need to know about these config files. I would even more greatly appreciate some assistance with this specific problem. -- View this message in context: http://boost.2283326.n4.nabble.com/1-53-Bjam-fails-when-adding-arguments-Be… Sent from the Boost - Users mailing list archive at Nabble.com.

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boost::filesystem create directory fail
by albert 06 Mar '13

06 Mar '13

I use the code below to create directories, but it fails. What is the correct way to do it? Thanks in advance. try { string logdirname("./notexistdir/logdir/"); boost::filesystem::path logdir(logdirname.c_str()); boost::filesystem::file_status s = boost::filesystem::status(logdir); if( !boost::filesystem::is_directory(s) ) { cout<< "not a directory, mkdir" <<endl; if(boost::filesystem::create_directory(logdir)) { cout<<"directory create ok" <<endl; } else { cout<<"directory create fail" <<endl; } } else { cout<<"is a directory" <<endl; } } catch(exception& ex) { cout<< "exception caught[" << ex.what() <<"]" <<endl; }

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asio: async ops in multithreading environment
by Max Dmitrichenko 06 Mar '13

06 Mar '13

Hi! I have strange crashes of my application that uses async ops in multiple threads. Before I describe my vision of the problem I point the following: 1) I'm aware that shared access to the same socket from multiple threads is unsafe. 2) All operations which my code issues on the same socket are made under mutex. As far as I understand, the following happens: 1) One thread issues scatter-gather boost::asio::async_write() for boost::array<boost::asio::const_buffer, 2> on socket A. 2) Another thread closes socket A after that. 3) Meantime (simultaneously with 2), first buffer write is completed and one of the threads running io_service::run() starts to execute second part of async_write from 1). In this place application segfaults: #0 0x00007fa3a3a2c4eb in boost::asio::detail::epoll_reactor::start_op (this=0x19c3410, op_type=1, descriptor=27, descriptor_data=@0x7f9dfc013260, op=0x7f9dfc2d2130, allow_speculative=true) at boost-1_51/boost/asio/detail/impl/epoll_reactor.ipp:219 #1 0x00007fa3a3a2bf63 in boost::asio::detail::reactive_socket_service_base::start_op (this=0x19c4338, impl=..., op_type=1, op=0x7f9dfc2d2130, is_non_blocking=true, noop=false) at boost-1_51/boost/asio/detail/impl/reactive_socket_service_base.ipp:211 #2 0x00007fa3a3af4ec5 in boost::asio::detail::reactive_socket_service_base::async_send (this=0x19c4338, impl=..., buffers=..., flags=0, handler=...) at boost-1_51/boost/asio/detail/reactive_socket_service_base.hpp:212 #3 0x00007fa3a3af90bf in boost::asio::stream_socket_service<boost::asio::ip::tcp>::async_send (this=0x19c4310, impl=..., buffers=..., flags=0, handler=...) at boost-1_51/boost/asio/stream_socket_service.hpp:298 #4 0x00007fa3a3b05992 in boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> >::async_write_some (this=0x7f9dfc013250, buffers=..., handler=...) at boost-1_51/boost/asio/basic_stream_socket.hpp:676 because descriptor_data equals null-pointer here. The problem is: second write which is issued internally by boost cannot be protected by the same mutex which is used for protected access to the socket in my code. So, the question is: how can I safely close the socket? -- Max

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Problem with the parallel graph
by Yeni Lora 06 Mar '13

06 Mar '13

I am student of Computer Science in Universidad de Oriente from Cuba, and I have a problem with the parallel graph, when I am adding edge betwen two procesors and one of them change any property of my edge, the other processor not update the property . for example my code is : #include "mpi.h" #include <boost/config.hpp> #include <boost/graph/use_mpi.hpp> #include <boost/graph/distributed/mpi_process_group.hpp> #include <boost/graph/distributed/adjacency_list.hpp> #include <boost/property_map/parallel/distributed_property_map.hpp> #include <boost/serialization/list.hpp> #include <list> using namespace std; //===============================Vertex================================ struct Vertex{ int id; // Serialization support is required! template<typename Archiver> void serialize(Archiver& ar, const unsigned int ) { ar & id ; } Vertex(int id = 0): id(id){} }; //===============================Edge================================ struct Edge{ int type; Edge( int type = 0): type(type){ } // Serialization support is required! template<typename Archiver> void serialize(Archiver& ar,const unsigned int ) { ar & type; } }; using namespace boost; using boost::graph::distributed::mpi_process_group; typedef adjacency_list < listS, distributedS<mpi_process_group, listS>, undirectedS, Vertex, Edge > Graph; typedef typename Graph::edge_descriptor edge_descriptor; typedef typename Graph::vertex_descriptor vertex_descriptor; int main (int argc, char ** argv){ boost::mpi::environment env(argc,argv); mpi::communicator world; Graph g; vertex_descriptor vi,vj; property_map<Graph, int Edge::*>::type type1 = get(&Edge::type, g); if (g.processor()==0) vi = add_vertex(Vertex(1),g); if (g.processor()==1) vj = add_vertex(Vertex(2),g); broadcast(world, vj, 1); broadcast(world, vi, 0); if (g.processor()==0){ pair<edge_descriptor,bool> p = add_edge(vi, vj, Edge(1), g); std::cout<<"Process "<<g.processor()<<std::endl; std::cout<<"Process owner of edge "<<owner(p.first)<<std::endl; std::cout<<"Property type of edge :"<<get(type1,p.first)<<std::endl; } synchronize(g); if (g.processor()==1){ pair<edge_descriptor,bool> p = edge(vi, vj, g); if(p.second){ std::cout<<"\nProcess "<<g.processor()<<std::endl; std::cout<<"Process owner of edge "<<owner(p.first)<<std::endl; put(type1,p.first,3); std::cout<<"Change property type of edge :"<<get(type1,p.first)<<std::endl; } } synchronize(g); if (g.processor()==0){ pair<edge_descriptor,bool> p = edge(vi, vj, g); std::cout<<"\nProcess "<<g.processor()<<std::endl; std::cout<<"Property type of edge :"<<get(type1,p.first)<<std::endl; } return 0; } The output: Process 0 Process owner of edge 0 Property type of edge :1 Process 1 Process owner of edge 1 Change property type of edge :3 Process 0 Property type of edge :1 What can I do for resolve the problem?

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boost.MSM: No member function 'process_any_event' declared
by RaRi 05 Mar '13

05 Mar '13

Hi Christophe, In case a class is derived from the msm::back::state_machine class and used with the favor_compile_time policy I get the following error: *No member function 'process_any_event' declared* Please consider the following code snippets to get more details: *// MasterStateMachine.hpp* struct Master_: mgp_state_machine_def<Master_> { // ... } *class MasterStateMachine : public msm::back::state_machine<Master_, msm::back::favor_compile_time>{ public: MasterStateMachine () { // some stufff }; } *// MasterStateMachine.cpp* #include "MasterStateMachine.hpp" BOOST_MSM_BACK_GENERATE_PROCESS_EVENT(MasterStateMachine) Why does the compiler complains although the class MasterStateMachine inherits the "process_any_event" method from the *msm::back::state_machine<Master_, msm::back::favor_compile_time>* back-end? The point of matter is the *BOOST_MSM_BACK_GENERATE_PROCESS_EVENT(MasterStateMachine)* macro. In case it is uncomment, everythin works fine, but unfortunately without the support of the favor_compile_time policy. Background: I need to derive the class *MasterStateMachine * from the the mentioned back-end as singleton semantic has to be added to the *MasterStateMachine * class. *Not using* the favor_compile_policy is not a option! I have already tried to overload the *process_any_event* method in the derived "MasterStateMachine" class to comply with the compilers needs: class MasterStateMachine : public msm::back::state_machine<Master_, msm::back::favor_compile_time>{ private: static MasterStateMachine *m_Instance; // Constructor to avoid instantiation from the outside MasterStateMachine() {}; // Constructor to avoid copy-constructing MasterStateMachine(const MasterStateMachine&) {} // Constructor to avoid assignation MasterStateMachine& operator = (const MasterStateMachine&) { return *this; } ~MasterStateMachine() {}; public: static MasterStateMachine* getInstance(); static void release(); msm::back::HandledEnum process_any_event(const boost::any & evt) { return this->process_any_event(evt); } };* Unfortunately the error remains! Does anybody ;) have a clue? Thanks in advanced! Regards, Rafael -- View this message in context: http://boost.2283326.n4.nabble.com/boost-MSM-No-member-function-process-any… Sent from the Boost - Users mailing list archive at Nabble.com.

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[thread] Using lambda with unique_future
by Christian Henning 05 Mar '13

05 Mar '13

Hi all, I'm toying around with futures and I'm stumbling with the Visual Studio 2010 compiler. The following doesn't compile: #include <iostream> #include <boost/thread/future.hpp> int main() { boost::unique_future<int> the_answer = boost::async( [] () ->int { return 42; } ); std::cout << the_answer.get() << std::endl; return 0; } the error is: 1>c:\gil_contributions\sdl_test\async_test.cpp(9): error C2440: 'initializing' : cannot convert from 'boost::unique_future<R>' to 'boost::unique_future<R>' 1> with 1> [ 1> R=void 1> ] 1> and 1> [ 1> R=int 1> ] 1> No constructor could take the source type, or constructor overload resolution was ambiguous clang works just fine: http://liveworkspace.org/code/1gOYwa$2 Is this a compiler error or am I doing something wrong? Thanks, Christian

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Flyweights: compute a hash from them
by Akim Demaille 05 Mar '13

05 Mar '13

Hi all, My parser is building string_t = flyweight<std::string> for identifiers, and it works very well. Now, I would like to make an unordered_map <string_t, foo_t>, but I have to define a hash function for string_t. I can do it but since the whole point of flyweight is to make unique instances, it would be a pity to hash the value. So I hash the address of the result of get(). Is this ok? So far everything is fine, but I might have missed something. In particular, I don't understand why their is no standard hash function defined for flyweights. Thanks in advance!

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Re: [Boost-users] [parallel graph] error building parallel BGL
by The Maschine 05 Mar '13

05 Mar '13

*Hi,* * * *Yes it compiled in xcode, no problems.* * * *Process 0 on power-zmkl.local* *pi is approximately 3.1416009869231254, Error is 0.0000083333333323* *wall clock time = 0.000034* * * *When I try to use the same setup with the:* * * // Example usage of breadth_first_search algorithm For the lib/parallel_graph/exmaples I again have this error: /usr/local/include/boost/graph/distributed/mpi_process_group.hpp:419:28: No viable conversion from 'shared_ptr<boost::graph::distributed::mpi_process_group::impl>' to 'bool' On a linux (mint) that I have, everything compiled without problems. Any workaround for the Mac? Thanks, Tasos

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Re: [Boost-users] build error boost 1.53.0
by Dev Guy 05 Mar '13

05 Mar '13

After reading another post for build errors, I got the hint from it to install python-dev and everything now builds without errors. To install the missing python headers on Ubuntu, just type: sudo apt-get install python-dev On Mon, Mar 4, 2013 at 9:12 PM, Dev Guy <devguy.ca(a)gmail.com> wrote: > I attached my build.log, however here are the type of build errors I am > getting: > > gcc.compile.c++ > bin.v2/libs/program_options/build/gcc-4.7/release/threading-multi/winmain.o > gcc.compile.c++ > bin.v2/libs/program_options/build/gcc-4.7/release/threading-multi/split.o > gcc.link.dll > bin.v2/libs/program_options/build/gcc-4.7/release/threading-multi/libboost_program_options.so.1.53.0 > common.copy stage/lib/libboost_program_options.so.1.53.0 > ln-UNIX stage/lib/libboost_program_options.so > common.mkdir bin.v2/libs/python > common.mkdir bin.v2/libs/python/build > common.mkdir bin.v2/libs/python/build/gcc-4.7 > common.mkdir bin.v2/libs/python/build/gcc-4.7/release > common.mkdir bin.v2/libs/python/build/gcc-4.7/release/threading-multi > gcc.compile.c++ > bin.v2/libs/python/build/gcc-4.7/release/threading-multi/numeric.o > In file included from ./boost/python/detail/prefix.hpp:13:0, > from ./boost/python/numeric.hpp:8, > from libs/python/src/numeric.cpp:6: > ./boost/python/detail/wrap_python.hpp:75:24: fatal error: patchlevel.h: No > such file or directory > compilation terminated. > > Not sure how to fix? A quick search shows the missing file is located at: > > /home/yadav/dev/cpp/boost_1_53_0/tools/build/v2/engine/patchlevel.h > > I am building from /home/yadav/dev/cpp/boost_1_53_0 > > > > On Sat, Feb 23, 2013 at 12:17 AM, Dev Guy <devguy.ca(a)gmail.com> wrote: > >> Hello I got the following build errors on my linux box building version >> 1.53.0 >> >> gcc.compile.c++ >> bin.v2/libs/wave/build/gcc-4.7/release/link-static/threading-multi/cpplexer/re2clex/aq.o >> gcc.compile.c++ >> bin.v2/libs/wave/build/gcc-4.7/release/link-static/threading-multi/cpplexer/re2clex/cpp_re.o >> gcc.archive >> bin.v2/libs/wave/build/gcc-4.7/release/link-static/threading-multi/libboost_wave.a >> common.copy /home/yadav/dev/cpp/boost_1.53.0/lib/libboost_wave.a >> ...failed updating 56 targets... >> ...skipped 6 targets... >> ...updated 10989 targets... >> >> >> Linux version is: >> uname -a >> Linux karma 3.5.0-23-generic #35-Ubuntu SMP Thu Jan 24 13:15:40 UTC 2013 >> x86_64 x86_64 x86_64 GNU/Linux >> >> GCC Version >> gcc -v >> Using built-in specs. >> COLLECT_GCC=gcc >> COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper >> Target: x86_64-linux-gnu >> Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro >> 4.7.2-2ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs >> --enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr >> --program-suffix=-4.7 --enable-shared --enable-linker-build-id >> --with-system-zlib --libexecdir=/usr/lib --without-included-gettext >> --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7 >> --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu >> --enable-libstdcxx-debug --enable-libstdcxx-time=yes >> --enable-gnu-unique-object --enable-plugin --enable-objc-gc >> --disable-werror --with-arch-32=i686 --with-tune=generic >> --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu >> --target=x86_64-linux-gnu >> Thread model: posix >> gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1) >> >> Thanks! >> > > > > -- > Kind Regards, > Rajinder Yadav > > SafetyNet Test Driven Development > http://safetynet.devmentor.org > -- Kind Regards, Rajinder Yadav SafetyNet Test Driven Development http://safetynet.devmentor.org

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