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[range] master broken in latest MSVC
by Vinnie Falco 26 Apr '18

26 Apr '18

I'm using the latest release of Visual Studio and I get these errors from the master superproject: 8>c:\users\vinnie\src\boost\boost\range\concepts.hpp(257): error C3646: 'n': unknown override specifier 8>c:\users\vinnie\src\boost\boost\range\concepts.hpp(264): note: see reference to class template instantiation 'boost::range_detail::RandomAccessIteratorConcept<Iterator>' being compiled 8>c:\users\vinnie\src\boost\boost\range\concepts.hpp(257): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int This issue exactly describes the problem: <https://github.com/boostorg/range/issues/68> Thanks

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[lexical_cast] calling virtual function in constructor of `boost::detail::basic_pointerbuf`
by Andrzej Krzemienski 25 Apr '18

25 Apr '18

Hi everyone, Following the recommendation, I am posting a note about the filed issue in lexical_cast: https://svn.boost.org/trac10/ticket/13540#ticket clang-tidy reports (while checking the code that uses boost::lexical_cast) a virtual function is called in the default constructor of class template boost::detail::basic_pointerbuf. (Function setbuf() is declared virtual in base class.) This might be an indication of a bug. If not, I would recommend using a different construct that avoids confusion, for instance declaring the function override final in newer versions of C++, or providing another function with different name but with the same semantics as the overriding setbuf(). Here's the link to the offending call: https://github.com/boostorg/lexical_cast/blob/develop/include/boost/detail/… Regards, &rzej;

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Fornux C++ Superset
by Phil Bouchard 24 Apr '18

24 Apr '18

Greetings, Because there was a conflict of interests in the past then I feel obliged to give an update regarding the status of the "Fornux C++ Superset" (formerly "Fornux C Leak Detector"). This way corporations will not claim ownership of the idea. - Fornux C++ Superset harnesses the power of Clang. - It now supports, as you have guessed, C++98 syntax. - It's deterministic so it will not slow down your application randomly like with Java. - You can see attached examples memory leaks in C & C++ with cyclic references which are correctly handled and the memory usage never increases. Like I mentioned previously, I am working hard on a free version I will be able to share in a month or two. Regards, Phil Bouchard www.fornux.com

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[interprocess] Enhancment for Boost.Interprocess on Windows
by Aliaksandr Zaitsau 23 Apr '18

23 Apr '18

Hello, My colleague at work suggests an enchancement for Boost.Interprocess for detecting unique boot on Windows. Currently in Boost.Interprocess we have 3 implementations: 1. Using COM. It is marked as incorrect in case of hibernation. 2. Current default implementation using system events log is incorrect since lots of computers will not have expected event in system event log. 3. There is some new for me implementation using reading Windows registry. It is disabled by default. Question 1 What Windows versions are expected to be supported by current library version? What about Windows XP? Earlier Windows? Question 2 What is the status of third implementation via registry? Question 3 It seems strange for him third implementation needs 2 registry values for creating unique id. First of them looks enough for this purpose. And another one may be not present on some Windows. Who may he speak to get technical details why this implementation looks like this? He has an idea how to implement unique boot id better than first and second implementations. He tried to email Ion Gaztanaga directly, but without any responce. Is it good idea to create PR on GitHub before getting any details from Ion? Best regards, Alexander Zaitsev

2 1

UUID broken with Boost 1.67 and VS2015?
by rleigh＠codelibre.net 23 Apr '18

23 Apr '18

In a source file including: #include <boost/uuid/uuid.hpp> #include <boost/uuid/uuid_io.hpp> #include <boost/uuid/uuid_generators.hpp> and then calling boost::uuids::to_string(boost::uuids::random_generator()()) I'm getting: [15/26] Linking CXX executable test\ome-files\ometiffwriter.exe FAILED: test/ome-files/ometiffwriter.exe cmd.exe /C "cd . && "C:\Program Files\CMake\bin\cmake.exe" -E vs_link_exe --intdir=test\ome-files\CMakeFiles\ometiffwriter.dir --manifests -- C:\PROGRA~2\MICROS~1.0\VC\bin\amd64\link.exe /nologo test\ome-files\CMakeFiles\ometiffwriter.dir\ometiffwriter.cpp.obj test\ome-files\CMakeFiles\ometiffwriter.dir\tiffsamples.cpp.obj /out:test\ome-files\ometiffwriter.exe /implib:test\ome-files\ometiffwriter.lib /pdb:test\ome-files\ometiffwriter.pdb /version:0.0 /machine:x64 /debug /INCREMENTAL /subsystem:console lib\ome\files\ome-filesd.lib lib\ome\test\ome-testd.lib C:\build\b\stage\lib\ome-xmld.lib C:\build\b\stage\lib\boost_random-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\tiffd.lib C:\build\b\stage\lib\ome-commond.lib C:\build\b\stage\lib\boost_iostreams-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_log-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_filesystem-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_regex-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_log_setup-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_thread-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_date_time-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_chrono-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_system-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_atomic-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\Xalan-C_1D.lib C:\build\b\stage\lib\xerces-c_3D.lib C:\build\b\tools\lib\gtest.lib kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib && cd ." LINK Pass 1: command "C:\PROGRA~2\MICROS~1.0\VC\bin\amd64\link.exe /nologo test\ome-files\CMakeFiles\ometiffwriter.dir\ometiffwriter.cpp.obj test\ome-files\CMakeFiles\ometiffwriter.dir\tiffsamples.cpp.obj /out:test\ome-files\ometiffwriter.exe /implib:test\ome-files\ometiffwriter.lib /pdb:test\ome-files\ometiffwriter.pdb /version:0.0 /machine:x64 /debug /INCREMENTAL /subsystem:console lib\ome\files\ome-filesd.lib lib\ome\test\ome-testd.lib C:\build\b\stage\lib\ome-xmld.lib C:\build\b\stage\lib\boost_random-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\tiffd.lib C:\build\b\stage\lib\ome-commond.lib C:\build\b\stage\lib\boost_iostreams-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_log-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_filesystem-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_regex-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_log_setup-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_thread-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_date_time-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_chrono-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_system-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\boost_atomic-vc140-mt-gd-x64-1_67.lib C:\build\b\stage\lib\Xalan-C_1D.lib C:\build\b\stage\lib\xerces-c_3D.lib C:\build\b\tools\lib\gtest.lib kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib /MANIFEST /MANIFESTFILE:test\ome-files\CMakeFiles\ometiffwriter.dir/intermediate.manifest test\ome-files\CMakeFiles\ometiffwriter.dir/manifest.res" failed (exit code 1120) with the following output: Creating library test\ome-files\ometiffwriter.lib and object test\ome-files\ometiffwriter.exp ome-filesd.lib(OMETIFFWriter.cpp.obj) : error LNK2019: unresolved external symbol BCryptCloseAlgorithmProvider referenced in function "public: __cdecl boost::uuids::detail::random_provider_base::~random_provider_base(void)" (??1random_provider_base@detail@uuids@boost@@QEAA@XZ) ome-filesd.lib(OMETIFFWriter.cpp.obj) : error LNK2019: unresolved external symbol BCryptGenRandom referenced in function "public: void __cdecl boost::uuids::detail::random_provider_base::get_random_bytes(void *,unsigned __int64)" (?get_random_bytes@random_provider_base@detail@uuids@boost@@QEAAXPEAX_K@Z) ome-filesd.lib(OMETIFFWriter.cpp.obj) : error LNK2019: unresolved external symbol BCryptOpenAlgorithmProvider referenced in function "public: __cdecl boost::uuids::detail::random_provider_base::random_provider_base(void)" (??0random_provider_base@detail@uuids@boost@@QEAA@XZ) test\ome-files\ometiffwriter.exe : fatal error LNK1120: 3 unresolved externals Looking at boost/winapi/bcrypt.hpp from the 1.67.0 source tar.bz2, I see these symbols prototyped, but not defined anywhere. Is this header broken, missing the implementation? Thanks, Roger

4 4

Seeking help to build GitHub forks on AppVeyor and Travis
by Cromwell Enage 22 Apr '18

22 Apr '18

Hi, all! 1. Is this the right mailing list to seek help for building forks of Boost library modules on GitHub? If not, which mailing list should I bring the next questions to? 2. On my Boost.Parameter fork, one of the AppVeyor jobs gets cut off after 1 hour. How do I split the job into several jobs, one for each compiler or smaller set of compilers? 3. The Boost.MultiArray project on GitHub doesn't have AppVeyor or Travis configuration files, so I created a couple for my fork based on the ones that exist in Boost.Parameter. The AppVeyor jobs error out because they don't recognize the compile-fail rule when running the Jamfile script. Any clues as to what I'm missing? 4. On my Boost.MultiArray fork, one of the Travis jobs builds fine, but the other fails because <boost/array.hpp> is not found. Has anyone else run into this issue? If so, what was your workaround? My GitHub account is GitHub.com/CromwellEnage, in case anyone wants to peruse. Thanks in advance! Cromwell D. Enage

2 2

[graph][graph_parallel][disjoint_sets] Of dependencies and "pending" libraries.
by Rene Rivera 21 Apr '18

21 Apr '18

In the process of creating Conan packages I ran into the rather strange "disjoint_sets" library. It's a library that has been "pending" for 18 years, AFAICT. I don't know what a pending status means for this. But for creating modular packages it means it's a giant PITA to deal with the the interdependencies of "disjoint_sets", "graph", and "graph_parallel". What I want to know is: 1. What is this hidden "disjoint_sets" library/module that only has two headers? 2. Why isn't "disjoint_sets" in the "graph" library tree, especially given that it's not an official library (AFAICT)? 3. Why is "graph_parallel" not in the "graph" library also? -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net

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[release] Boost 1.67.0 Release Candidate 2
by Daniel James 20 Apr '18

20 Apr '18

The second release candidates for the 1.67.0 release are now available at: <https://dl.bintray.com/boostorg/release/1.67.0/source/> The SHA256 checksums are as follows: 1cd94f03a71334a67d36f5161b57f5931e0cd6ecf726d7aca8bd82a3be720b74 boost_1_67_0_rc2.7z 2684c972994ee57fc5632e03bf044746f6eb45d4920c343937a465fd67a5adba boost_1_67_0_rc2.tar.bz2 8aa4e330c870ef50a896634c931adf468b21f8a69b77007e45c444151229f665 boost_1_67_0_rc2.tar.gz 7e37372d8cedd0fd6b7529e9dd67c2cb1c60e6c607aed721f5894d704945a7ec boost_1_67_0_rc2.zip As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy.

11 12

Bug or change behavior in Fusion at_c in boost 1.66 and 1.67
by Pietro Incardona 18 Apr '18

18 Apr '18

Dear boost developers I used to use boost vector container with arrays like in the code below #include <boost/fusion/sequence/intrinsic/at.hpp> #include <boost/fusion/include/at.hpp> #include <boost/fusion/container/vector.hpp> int main() { boost::fusion::vector<int[3], int, int> v; boost::fusion::at_c<1>(v) = 2; boost::fusion::at_c<0>(v)[0] = 1; //// <----- Broken on newer boost version } Compiled with g++ --std=c++11 -I/home/i-bird/BOOST_166/include -o out main.cpp Unfortunately while this code was working under BOOST 1.63, on Boost 1.66 and Boost 1.67 it does not compile and it produce this error below. It seem that include/boost/fusion/container/vector/detail/value_at_impl.hpp went under some "modernization" process that broke the code above Regards Pietro /////////////////////////// Error ///////////////////////////////////////////// In file included from /home/i-bird/BOOST_166/include/boost/fusion/container/vector/detail/at_impl.hpp:12:0, from /home/i-bird/BOOST_166/include/boost/fusion/container/vector/vector.hpp:29, from /home/i-bird/BOOST_166/include/boost/fusion/container/vector.hpp:12, from main.cpp:3: /home/i-bird/BOOST_166/include/boost/fusion/container/vector/detail/value_at_impl.hpp: In instantiation of ‘struct boost::fusion::extension::value_at_impl<boost::fusion::vector_tag>::apply<boost::fusion::vector<int [3], int, int>, mpl_::int_<0> >’: /home/i-bird/BOOST_166/include/boost/fusion/container/vector/detail/at_impl.hpp:45:95: required from ‘struct boost::fusion::extension::at_impl<boost::fusion::vector_tag>::apply<const boost::fusion::vector<int [3], int, int>, mpl_::int_<0> >’ /home/i-bird/BOOST_166/include/boost/fusion/sequence/intrinsic/at.hpp:66:16: required from ‘struct boost::fusion::detail::at_impl<const boost::fusion::vector<int [3], int, int>, mpl_::int_<0>, boost::fusion::vector_tag>’ /home/i-bird/BOOST_166/include/boost/fusion/sequence/intrinsic/at.hpp:81:16: required from ‘struct boost::fusion::result_of::at<const boost::fusion::vector<int [3], int, int>, mpl_::int_<0> >’ /home/i-bird/BOOST_166/include/boost/fusion/sequence/intrinsic/at.hpp:86:16: required from ‘struct boost::fusion::result_of::at_c<const boost::fusion::vector<int [3], int, int>, 0>’ /home/i-bird/BOOST_166/include/boost/fusion/sequence/intrinsic/at.hpp:127:5: required by substitution of ‘template<int N, class Sequence> constexpr typename boost::fusion::result_of::at_c<const Sequence, N>::type boost::fusion::at_c(const Sequence&) [with int N = 0; Sequence = boost::fusion::vector<int [3], int, int>]’ main.cpp:9:26: required from here /home/i-bird/BOOST_166/include/boost/fusion/container/vector/detail/value_at_impl.hpp:53:68: error: no matching function for call to ‘value_at_impl<mpl_::int_<0>::value>(boost::fusion::vector<int [3], int, int>*)’ decltype(vector_detail::value_at_impl<N::value>(boost::declval<Sequence*>())) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/i-bird/BOOST_166/include/boost/fusion/container/vector/detail/value_at_impl.hpp:38:11: note: candidate: template<long unsigned int N, class U> U boost::fusion::vector_detail::value_at_impl(const volatile boost::fusion::vector_detail::store<N, U>*) U value_at_impl(store<N, U> const volatile*); ^~~~~~~~~~~~~ /home/i-bird/BOOST_166/include/boost/fusion/container/vector/detail/value_at_impl.hpp:38:11: note: template argument deduction/substitution failed: /home/i-bird/BOOST_166/include/boost/fusion/container/vector/detail/value_at_impl.hpp:53:68: note: template argument ‘1’ does not match ‘0’ decltype(vector_detail::value_at_impl<N::value>(boost::declval<Sequence*>())) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/i-bird/BOOST_166/include/boost/fusion/container/vector/detail/value_at_impl.hpp:53:68: note: template argument ‘2’ does not match ‘0’ /home/i-bird/BOOST_166/include/boost/fusion/container/vector/detail/value_at_impl.hpp: In substitution of ‘template<long unsigned int N, class U> U boost::fusion::vector_detail::value_at_impl(const volatile boost::fusion::vector_detail::store<N, U>*) [with long unsigned int N = 0; U = int [3]]’: /home/i-bird/BOOST_166/include/boost/fusion/container/vector/detail/value_at_impl.hpp:53:68: required from ‘struct boost::fusion::extension::value_at_impl<boost::fusion::vector_tag>::apply<boost::fusion::vector<int [3], int, int>, mpl_::int_<0> >’ /home/i-bird/BOOST_166/include/boost/fusion/container/vector/detail/at_impl.hpp:45:95: required from ‘struct boost::fusion::extension::at_impl<boost::fusion::vector_tag>::apply<const boost::fusion::vector<int [3], int, int>, mpl_::int_<0> >’ /home/i-bird/BOOST_166/include/boost/fusion/sequence/intrinsic/at.hpp:66:16: required from ‘struct boost::fusion::detail::at_impl<const boost::fusion::vector<int [3], int, int>, mpl_::int_<0>, boost::fusion::vector_tag>’ /home/i-bird/BOOST_166/include/boost/fusion/sequence/intrinsic/at.hpp:81:16: required from ‘struct boost::fusion::result_of::at<const boost::fusion::vector<int [3], int, int>, mpl_::int_<0> >’ /home/i-bird/BOOST_166/include/boost/fusion/sequence/intrinsic/at.hpp:86:16: required from ‘struct boost::fusion::result_of::at_c<const boost::fusion::vector<int [3], int, int>, 0>’ /home/i-bird/BOOST_166/include/boost/fusion/sequence/intrinsic/at.hpp:127:5: required by substitution of ‘template<int N, class Sequence> constexpr typename boost::fusion::result_of::at_c<const Sequence, N>::type boost::fusion::at_c(const Sequence&) [with int N = 0; Sequence = boost::fusion::vector<int [3], int, int>]’ main.cpp:9:26: required from here /home/i-bird/BOOST_166/include/boost/fusion/container/vector/detail/value_at_impl.hpp:38:11: error: function returning an array U value_at_impl(store<N, U> const volatile*); ^~~~~~~~~~~~~ main.cpp: In function ‘int main()’: main.cpp:9:26: error: no matching function for call to ‘at_c<0>(boost::fusion::vector<int [3], int, int>&)’ boost::fusion::at_c<0>(v)[0] = 1; ^ In file included from main.cpp:1:0: /home/i-bird/BOOST_166/include/boost/fusion/sequence/intrinsic/at.hpp:119:5: note: candidate: template<int N, class Sequence> constexpr typename boost::lazy_disable_if<boost::is_const<Sequence>, boost::fusion::result_of::at_c<Sequence, N> >::type boost::fusion::at_c(Sequence&) at_c(Sequence& seq) ^~~~ /home/i-bird/BOOST_166/include/boost/fusion/sequence/intrinsic/at.hpp:119:5: note: template argument deduction/substitution failed: /home/i-bird/BOOST_166/include/boost/fusion/sequence/intrinsic/at.hpp:127:5: note: candidate: template<int N, class Sequence> constexpr typename boost::fusion::result_of::at_c<const Sequence, N>::type boost::fusion::at_c(const Sequence&) at_c(Sequence const& seq) ^~~~ /home/i-bird/BOOST_166/include/boost/fusion/sequence/intrinsic/at.hpp:127:5: note: substitution of deduced template arguments resulted in errors seen above [i-bird@localhost boost_bug_test]$ [i-bird@localhost boost_bug_test]$ [i-bird@localhost boost_bug_test]$ [i-bird@localhost boost_bug_test]$ g++ --std=c++11 -I/home/i-bird/BOOST_167/include -o out main.cpp In file included from /home/i-bird/BOOST_167/include/boost/fusion/container/vector/detail/at_impl.hpp:12:0, from /home/i-bird/BOOST_167/include/boost/fusion/container/vector/vector.hpp:29, from /home/i-bird/BOOST_167/include/boost/fusion/container/vector.hpp:12, from main.cpp:3: /home/i-bird/BOOST_167/include/boost/fusion/container/vector/detail/value_at_impl.hpp: In instantiation of ‘struct boost::fusion::extension::value_at_impl<boost::fusion::vector_tag>::apply<boost::fusion::vector<int [3], int, int>, mpl_::int_<0> >’: /home/i-bird/BOOST_167/include/boost/fusion/container/vector/detail/at_impl.hpp:45:95: required from ‘struct boost::fusion::extension::at_impl<boost::fusion::vector_tag>::apply<const boost::fusion::vector<int [3], int, int>, mpl_::int_<0> >’ /home/i-bird/BOOST_167/include/boost/fusion/sequence/intrinsic/at.hpp:66:16: required from ‘struct boost::fusion::detail::at_impl<const boost::fusion::vector<int [3], int, int>, mpl_::int_<0>, boost::fusion::vector_tag>’ /home/i-bird/BOOST_167/include/boost/fusion/sequence/intrinsic/at.hpp:81:16: required from ‘struct boost::fusion::result_of::at<const boost::fusion::vector<int [3], int, int>, mpl_::int_<0> >’ /home/i-bird/BOOST_167/include/boost/fusion/sequence/intrinsic/at.hpp:86:16: required from ‘struct boost::fusion::result_of::at_c<const boost::fusion::vector<int [3], int, int>, 0>’ /home/i-bird/BOOST_167/include/boost/fusion/sequence/intrinsic/at.hpp:127:5: required by substitution of ‘template<int N, class Sequence> constexpr typename boost::fusion::result_of::at_c<const Sequence, N>::type boost::fusion::at_c(const Sequence&) [with int N = 0; Sequence = boost::fusion::vector<int [3], int, int>]’ main.cpp:9:26: required from here /home/i-bird/BOOST_167/include/boost/fusion/container/vector/detail/value_at_impl.hpp:53:68: error: no matching function for call to ‘value_at_impl<mpl_::int_<0>::value>(boost::fusion::vector<int [3], int, int>*)’ decltype(vector_detail::value_at_impl<N::value>(boost::declval<Sequence*>())) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/i-bird/BOOST_167/include/boost/fusion/container/vector/detail/value_at_impl.hpp:38:11: note: candidate: template<long unsigned int N, class U> U boost::fusion::vector_detail::value_at_impl(const volatile boost::fusion::vector_detail::store<N, U>*) U value_at_impl(store<N, U> const volatile*); ^~~~~~~~~~~~~ /home/i-bird/BOOST_167/include/boost/fusion/container/vector/detail/value_at_impl.hpp:38:11: note: template argument deduction/substitution failed: /home/i-bird/BOOST_167/include/boost/fusion/container/vector/detail/value_at_impl.hpp:53:68: note: template argument ‘1’ does not match ‘0’ decltype(vector_detail::value_at_impl<N::value>(boost::declval<Sequence*>())) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/i-bird/BOOST_167/include/boost/fusion/container/vector/detail/value_at_impl.hpp:53:68: note: template argument ‘2’ does not match ‘0’ /home/i-bird/BOOST_167/include/boost/fusion/container/vector/detail/value_at_impl.hpp: In substitution of ‘template<long unsigned int N, class U> U boost::fusion::vector_detail::value_at_impl(const volatile boost::fusion::vector_detail::store<N, U>*) [with long unsigned int N = 0; U = int [3]]’: /home/i-bird/BOOST_167/include/boost/fusion/container/vector/detail/value_at_impl.hpp:53:68: required from ‘struct boost::fusion::extension::value_at_impl<boost::fusion::vector_tag>::apply<boost::fusion::vector<int [3], int, int>, mpl_::int_<0> >’ /home/i-bird/BOOST_167/include/boost/fusion/container/vector/detail/at_impl.hpp:45:95: required from ‘struct boost::fusion::extension::at_impl<boost::fusion::vector_tag>::apply<const boost::fusion::vector<int [3], int, int>, mpl_::int_<0> >’ /home/i-bird/BOOST_167/include/boost/fusion/sequence/intrinsic/at.hpp:66:16: required from ‘struct boost::fusion::detail::at_impl<const boost::fusion::vector<int [3], int, int>, mpl_::int_<0>, boost::fusion::vector_tag>’ /home/i-bird/BOOST_167/include/boost/fusion/sequence/intrinsic/at.hpp:81:16: required from ‘struct boost::fusion::result_of::at<const boost::fusion::vector<int [3], int, int>, mpl_::int_<0> >’ /home/i-bird/BOOST_167/include/boost/fusion/sequence/intrinsic/at.hpp:86:16: required from ‘struct boost::fusion::result_of::at_c<const boost::fusion::vector<int [3], int, int>, 0>’ /home/i-bird/BOOST_167/include/boost/fusion/sequence/intrinsic/at.hpp:127:5: required by substitution of ‘template<int N, class Sequence> constexpr typename boost::fusion::result_of::at_c<const Sequence, N>::type boost::fusion::at_c(const Sequence&) [with int N = 0; Sequence = boost::fusion::vector<int [3], int, int>]’ main.cpp:9:26: required from here /home/i-bird/BOOST_167/include/boost/fusion/container/vector/detail/value_at_impl.hpp:38:11: error: function returning an array U value_at_impl(store<N, U> const volatile*); ^~~~~~~~~~~~~ main.cpp: In function ‘int main()’: main.cpp:9:26: error: no matching function for call to ‘at_c<0>(boost::fusion::vector<int [3], int, int>&)’ boost::fusion::at_c<0>(v)[0] = 1; ^ In file included from main.cpp:1:0: /home/i-bird/BOOST_167/include/boost/fusion/sequence/intrinsic/at.hpp:119:5: note: candidate: template<int N, class Sequence> constexpr typename boost::lazy_disable_if<boost::is_const<Sequence>, boost::fusion::result_of::at_c<Sequence, N> >::type boost::fusion::at_c(Sequence&) at_c(Sequence& seq) ^~~~ /home/i-bird/BOOST_167/include/boost/fusion/sequence/intrinsic/at.hpp:119:5: note: template argument deduction/substitution failed: /home/i-bird/BOOST_167/include/boost/fusion/sequence/intrinsic/at.hpp:127:5: note: candidate: template<int N, class Sequence> constexpr typename boost::fusion::result_of::at_c<const Sequence, N>::type boost::fusion::at_c(const Sequence&) at_c(Sequence const& seq) ^~~~ /home/i-bird/BOOST_167/include/boost/fusion/sequence/intrinsic/at.hpp:127:5: note: substitution of deduced template arguments resulted in errors seen above

3 3

Proposal of a new container
by Vanand Gasparyan 16 Apr '18

16 Apr '18

Hi everyone, First, a short introduction of me. My name is Vanand, I'm from Armenia, 23 yo, C++ software Engineer. I'm new in the community and I've come with a proposal. I've implemented a prefix tree and tried to make it as STL compatible as possible. After a short investigation I found out that boost libraries don't provide one and here I am with a proposal. Here is the link to the repository: https://github.com/vgasparyan1995/prefix_tree It's a header only implementation, all source files are in "include" directory. I also have unit and performance tests. If the proposal (of having prefix tree container in boost) is accepted, I will ask for mentorship and support to make it "boost friendly" , create a proper documentation, meet the coding style and other guidelines. In the end I want to mention that I am new to this, so if I'm already doing something wrong or this is not the proper way to propose something, please kindly let me know and help to do it right. Looking forward to hearing from anyone :) Best Regards, Vanand

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