June 2016 - Boost-users - lists.preview.boost.org

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)

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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

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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

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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 >

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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

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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

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

16 Jun '16

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[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

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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) -------------------

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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. ________________________________

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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

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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

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[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

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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

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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

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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

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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 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.

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[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!

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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!

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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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