December 2020 - Boost - lists.boost.org

Boost website changes and .'cxxstd'
by Edward Diener 24 Dec '20

24 Dec '20

Even though I have worked a little with PHP in the past I do not have the talent to make the change to the website which would incorporate the addition of the meta information json field 'cxxstd' to the Boost documentation web page for each library. The idea is that if 'cxxstd' is set to a value the documentation for that library would also show: C++ standard minimum level: C++nn where nn would be 11, 14, 17, or 20 depending on the value of 'cxxstd'. Alternatively if there is no 'cxxstd' entry for a library or if the value of 'cxxstd' is '03', we could either specify 'nn' as '03' or leave off the line stating the 'C++ standard minimum level completely. On the face of it this should be doable in the website code but evidently Daniel James is the only one who really understands how this works in the code and he is no longer active in Boost. So if someone else who understands the website code and PHP could do this it would be appreciated, since I think it will be valuable telling end-users whether a Boost library is usable at the C++ compiler level they are using.

3 3

(no subject)
by Harsh 21 Dec '20

21 Dec '20

Respected Sir/Madam Myself Harsh Agarwal a highly interested candidate to work on with ublas as a open source contributor but at starting need some guidance-: 1-:How can i start on with it. 2-: As if i want to participate in Gsoc 2021 till when will i get competency test. 3-: can i know about the basic project idea that will be for gsoc 2021 thanking you Harsh Agarwal 21/12/2020

2 1

regarding boost gsoc competency test 2021
by Mohd Huzaifa 20 Dec '20

20 Dec '20

hii sir/madam I want to ask about the boost competency test for gsoc 2021. When it will be available. And can I get the list of past competency tests.

2 1

Tagging the minimum C++ standard level for Boost libs
by Edward Diener 19 Dec '20

19 Dec '20

I had previously proposed that we tag the minimum C++ standard level for Boost libs by adding information to the json meta information in libraries.json for each library. I would like to revisit that proposal, which involved more elaborate suggestions, with this simpler overall proposal: for each Boost C++ library whose minimum C++ standard level is C++11 or above we add a json field called 'cxxstd' whose value corresponds to one of the same values as currently exists in Boost.Build for the 'cxxstd' feature, ie. 11,14,17,20, to the libraries.json file for that library. This json value can then be used in Boost documentation of each library to specify the minimum C++ standard level needed by an end-user in order to use that library. Obviously we can also add "cxxstd": "03" for the many Boost libraries which can still be used at the C++98/C++03 compilation level also, even though I would argue that not having a "cxxstd" json field should mean C++98/C++03 by default. I would be willing to create the necessary PRs for each library, as I have a pretty good internal list of this information. The gist of this proposal is to make it much easier for end-users wishing to use a Boost library to immediately know whether the library they wish to use is usable at the C++ standard compilation level they are using for compilation, without having to spend time searching for such information, which is often not readily available, in the documentation of the library they are considering. I can go ahead and start doing this now, but of course I am willing to listen to what others think about this. But let's not let another round of inertia stop doing at all what should be a simple means of telling end-user's whether a Boost library is at least minimally usable by them in their C++ projects.

5 13

Re: [boost] [release] Boost 1.75.0 Release Candidate 1
by Glen Fernandes 17 Dec '20

17 Dec '20

On 2020-12-13 03:34:00 Glen Fernandes wrote: > > On Sat, Dec 12, 2020 at 8:16 PM Edward Diener wrote: >> The final issue was that the index.html for the release showed 1.74 >> rather than 1.75. This seems to be generated from some sort of template >> where '{{version}}' is supposed to be plugged in by the correct version, >> but evidently did not work properly. Maybe someone who knows how this is >> supposed to work, but evidently did not, can look at it. > > Sounds like generate.php?page=index.html&version=<version> was invoked > with the wrong <version> . I'll take a look and see what I can find. Fixed: https://github.com/boostorg/release-tools/commit/b08dbc34451e9f5b09ec44cab5… Glen

1 0

Boost Pub/Sub message service model Implementation
by Rakshita Parihar 15 Dec '20

15 Dec '20

Hello, Currently, I am working on an IoT project where I need to send data from client to server. To transfer data, I need to setup a Pub/Sub message service model. Presently, I am using MQTT Paho C libraries to transmit data to server over TCP IP protocol but I want to switch to boost C++ library for the publish/subscribe model. I am a newbie to this library and have some queries: *1) Is there any boost C++ library for pub/sub model? If yes, please give me the details or link for the tutorial.* *2) If no library is present, please tell me how to implement a message pub/sub <https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern> service to communicate using boost C++ library?* Please, help me to solve these issues. Thanks & Regards, Rakshita Parihar

5 5

[release] Boost 1.75.0 Release Candidate 1
by Marshall Clow 13 Dec '20

13 Dec '20

[release] Boost 1.75.0 Release Candidate 1 The first release candidates for the 1.75.0 release are now available at: <https://dl.bintray.com/boostorg/release/1.75.0/source/> The SHA256 checksums are as follows: caf36d7c13b3d8ce62282a64a695113945a13b0f1796a45160726d04295f95ed boost_1_75_0_rc1.zip aeb26f80e80945e82ee93e5939baebdca47b9dee80a07d3144be1e1a6a66dd6a boost_1_75_0_rc1.tar.gz 953db31e016db7bb207f11432bef7df100516eeb746843fa0486a222e3fd49cb boost_1_75_0_rc1.tar.bz2 3a8b314871646e7404886736273c053278ba71b11347f72d4751411d65d6d1a5 boost_1_75_0_rc1.7z 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. -- The Release managers

6 11

bootstrap was broken since 1.74
by Neo Anderson 12 Dec '20

12 Dec '20

Hi List, I am a casual user of boost library. I usually build boost for use to build CodeBlocks IDE on Windows platform. But since version 1.74, I found that bootstrap.bat was broken. So I skipped 1.74 and stuck to the old version 1.73. Today I am happy to see that 1.75 was out and I thought this problem would have been fixed since it’s a small problem. But I am wrong. I think line 15 lacks command line parameter: call .\build.bat %1. After adding that %1, I successfully built b2 with bootstrap.cmd gcc. But when I run .\b2, I get very confusing error messages (which are the same ones in 1.74): C:\Build\src\boost_1_75_0>.\b2 Performing configuration checks - default address-model : 32-bit - default architecture : x86 Building the Boost C++ Libraries. - compiler supports SSE2 : yes - compiler supports SSE4.1 : yes - has synchronization.lib : yes - C++11 mutex : yes - has BCrypt API : yes - has stat::st_mtim : no - has stat::st_mtimensec : no - has stat::st_mtimespec : no - has stat::st_birthtim : no - has stat::st_birthtimensec : no - has stat::st_birthtimespec : no - has statx : no - has statx syscall : no - cxx11_auto_declarations : yes - cxx11_constexpr : yes - cxx11_defaulted_functions : yes - cxx11_final : yes - cxx11_hdr_mutex : yes - cxx11_hdr_tuple : yes - cxx11_lambdas : yes - cxx11_noexcept : yes - cxx11_nullptr : yes - cxx11_rvalue_references : yes - cxx11_template_aliases : yes - cxx11_thread_local : no - cxx11_variadic_templates : yes - has_icu builds : no warning: Graph library does not contain MPI-based parallel components. note: to enable them, add "using mpi ;" to your user-config.jam. note: to suppress this message, pass "--without-graph_parallel" to bjam. - zlib : yes - bzip2 : no - lzma : no - zstd : yes - lzma : no - has_lzma_cputhreads builds : no - cxx11_alignas : yes - cxx11_decltype : yes - iconv (libc) : no - iconv (separate) : yes - icu : no - icu (lib64) : no - native atomic int32 supported : yes - has message compiler : no - native syslog supported : no - pthread supports robust mutexes : no - compiler supports SSSE3 : yes - compiler supports AVX2 : yes - gcc visibility : yes - long double support : yes warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. - cxx11_static_assert : yes - std::fstream is moveable and swappable : yes - Has Large File Support : yes warning: No python installation configured and autoconfiguration note: failed. See http://www.boost.org/libs/python/doc/building.html note: for configuration instructions or pass --without-python to note: suppress this message and silently skip all Boost.Python targets - libbacktrace builds : no - addr2line builds : no - WinDbg builds : yes - WinDbgCached builds : no - BOOST_COMP_GNUC >= 4.3.0 : yes - zlib : yes (cached) - bzip2 : no (cached) - lzma : no (cached) - zstd : yes (cached) - compiler supports SSE2 : no - compiler supports SSE4.1 : no - has synchronization.lib : no - C++11 mutex : no - has BCrypt API : no - is Windows CE : no - has stat::st_mtim : no - has stat::st_mtimensec : no - has stat::st_mtimespec : no - has stat::st_birthtim : no - has stat::st_birthtimensec : no - has stat::st_birthtimespec : no - has statx : no - has statx syscall : no - cxx11_auto_declarations : no - cxx11_constexpr : no - cxx11_defaulted_functions : no - cxx11_final : no - cxx11_hdr_mutex : no - cxx11_hdr_tuple : no - cxx11_lambdas : no - cxx11_noexcept : no - cxx11_nullptr : no - cxx11_rvalue_references : no - cxx11_template_aliases : no - cxx11_thread_local : no - cxx11_variadic_templates : no - native atomic int32 supported : no - has message compiler : no - native syslog supported : no - pthread supports robust mutexes : no - has_icu builds : no - compiler supports SSSE3 : no - compiler supports AVX2 : no C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:609: in start-building from module targe ts error: Recursion in main target references error: the following target are being built currently: error: ./forward ./stage ./stage-proper libs/filesystem/build/stage libs/filesystem/build/stage-depe ndencies libs/log/build/stage libs/log/build/stage-dependencies libs/filesystem/build/stage C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:776: in class(a)main-target.generate from module object(main-target)@7282 C:/Build/src/boost_1_75_0/tools/boost_install\boost-install.jam:1176: in generate-dependencies from module boost-install C:/Build/src/boost_1_75_0/tools/build/src/kernel\modules.jam:107: in modules.call-in from module boo st-install C:/Build/src/boost_1_75_0/tools/build/src/util\indirect.jam:105: in indirect.call from module indire ct C:/Build/src/boost_1_75_0/tools/build/src/tools\generate.jam:59: in construct from module object(gen erated-target-class)@2809 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:1364: in class(a)basic-target.generate fro m module object(generated-target-class)@2809 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:812: in generate-really from module obje ct(main-target)@11221 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:784: in class(a)main-target.generate from module object(main-target)@11221 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:934: in targets.generate-from-reference from module targets C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:1277: in generate-dependencies from modu le object(alias-target-class)@2810 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:1334: in class(a)basic-target.generate fro m module object(alias-target-class)@2810 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:812: in generate-really from module obje ct(main-target)@11222 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:784: in class(a)main-target.generate from module object(main-target)@11222 C:/Build/src/boost_1_75_0/tools/boost_install\boost-install.jam:1176: in generate-dependencies from module boost-install C:/Build/src/boost_1_75_0/tools/build/src/kernel\modules.jam:107: in modules.call-in from module boo st-install C:/Build/src/boost_1_75_0/tools/build/src/util\indirect.jam:105: in indirect.call from module indire ct C:/Build/src/boost_1_75_0/tools/build/src/tools\generate.jam:59: in construct from module object(gen erated-target-class)@1817 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:1364: in class(a)basic-target.generate fro m module object(generated-target-class)@1817 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:812: in generate-really from module obje ct(main-target)@7281 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:784: in class(a)main-target.generate from module object(main-target)@7281 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:934: in targets.generate-from-reference from module targets C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:1277: in generate-dependencies from modu le object(alias-target-class)@1818 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:1334: in class(a)basic-target.generate fro m module object(alias-target-class)@1818 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:812: in generate-really from module obje ct(main-target)@7282 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:784: in class(a)main-target.generate from module object(main-target)@7282 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:934: in targets.generate-from-reference from module targets C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:1277: in generate-dependencies from modu le object(alias-target-class)@184 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:1334: in class(a)basic-target.generate fro m module object(alias-target-class)@184 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:812: in generate-really from module obje ct(main-target)@5196 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:784: in class(a)main-target.generate from module object(main-target)@5196 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:934: in targets.generate-from-reference from module targets C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:1277: in generate-dependencies from modu le object(top-level-target)@190 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:1334: in alias-target-class.generate fro m module object(top-level-target)@190 C:/Build/src/boost_1_75_0\boostcpp.jam:403: in build-multiple from module object(top-level-target)@1 90 C:/Build/src/boost_1_75_0\boostcpp.jam:393: in class(a)top-level-target.generate from module object(to p-level-target)@190 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:812: in generate-really from module obje ct(main-target)@5198 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:784: in class(a)main-target.generate from module object(main-target)@5198 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:934: in targets.generate-from-reference from module targets C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:1277: in generate-dependencies from modu le object(top-level-target)@191 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:1334: in alias-target-class.generate fro m module object(top-level-target)@191 C:/Build/src/boost_1_75_0\boostcpp.jam:403: in build-multiple from module object(top-level-target)@1 91 C:/Build/src/boost_1_75_0\boostcpp.jam:393: in class(a)top-level-target.generate from module object(to p-level-target)@191 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:812: in generate-really from module obje ct(main-target)@5199 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:784: in class(a)main-target.generate from module object(main-target)@5199 C:/Build/src/boost_1_75_0/tools/build/src/build\targets.jam:273: in class(a)project-target.generate fr om module object(project-target)@134 C:/Build/src/boost_1_75_0/tools/build/src\build-system.jam:797: in load from module build-system C:/Build/src/boost_1_75_0/tools/build/src/kernel\modules.jam:295: in import from module modules C:/Build/src/boost_1_75_0/tools/build/src/kernel/bootstrap.jam:139: in boost-build from module C:/Build/src/boost_1_75_0/boost-build.jam:17: in module scope from module

1 0

[release] Boost 1.75.0
by Marshall Clow 11 Dec '20

11 Dec '20

Release 1.54.0 of the Boost C++ Libraries is now available. These open-source libraries work well with the C++ Standard Library, and are usable across a broad spectrum of applications. The Boost license encourages both commercial and non-commercial use. This release contains 1 new library and numerous enhancements and bug fixes for existing libraries. For details, including download links, see <http://www.boost.org/users/news/version_1.75.0> You can also download directly from: <https://dl.bintray.com/boostorg/release/1.75.0/> To install this release on your system, see <http://www.boost.org/doc/libs/release/more/getting_started/index.html> Thanks to everyone who participated in this release. Thanks, -- The Boost Release Team Marshall Clow, Glen Fernandes, Michael Caisse

2 1

[release] 1.76.0 open for merging
by Marshall Clow 11 Dec '20

11 Dec '20

The master branch is open for merging all stable changes from develop, including bug fixes and major upgrades to existing libraries. Breaking changes should be coordinated via the mailing list with the developers of the other libraries affected. New libraries may be added, but require permission of a release manager. In other words, merging does not require permission from a release manager, except for new libraries. Boost Calendar with the release schedule: http://www.boost.org/development/index.html <http://www.boost.org/development/index.html> Release schedule explanation: https://github.com/boostorg/wiki/wiki/Releases%3A-Schedule <https://github.com/boostorg/wiki/wiki/Releases%3A-Schedule> Release practices for developers: http://svn.boost.org/trac/boost/wiki/ImprovingPractices <http://svn.boost.org/trac/boost/wiki/ImprovingPractices> -- The Boost Release Team

2 1