May 2023 - Boost - lists.preview.boost.org

Library proposal - indexed_array
by Julien Blanc 12 Oct '23

12 Oct '23

Hi, I've written and released a (rather small) library which allows defining arrays with arbitrary index mechanisms (hence the name, indexed_array). This especially allows indexing with scoped enums, use non zero-starting indexes, or use sparse indexes. This is not a view, but an array in the sense that it owns the data, and provides the same guarantees and functionalities as std::array, such as triviality propagation, being able to reside in read-only program sections, etc. It also supports multidimensional indexing, and provides an indexed_span template class to access lower dimension content (which can be used outside indexed_array). Finally, it provides an opt-in safer way to initialize the array content, which is especially useful when using complex and/or changing indexing schemes (like based on externally generated files). The library is available here: https://github.com/Julien-Blanc-tgcm/indexed_array And the doc is here: https://julien-blanc-tgcm.github.io/indexed_array/ It requires C++17 and mp11, and has first-class support for describe-d enums. If there is some interest, i'd like to propose it for inclusion in boost. So i'm looking for people who would endorse it. Thanks and best regards, Julien

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Windows Develop Regression Tests Failing - Boost Build?
by Tom Kent 04 Jun '23

04 Jun '23

When trying to run the regression tests for the develop branch from windows, I'm getting the following error: C:/teeks99-09/run/boost_bb/src/build\project.jam:284: in find-jamfile from module project error: Unable to load Jamfile. error: Could not find a Jamfile in directory '../../C:/teeks99-09/run/boost_root'. error: Attempted to find it with pattern '[Bb]uild.jam [Jj]amfile.v2 [Jj]amfile [Jj]amfile. [Jj]amfile.jam'. error: Please consult the documentation at 'https://www.bfgroup.xyz/b2/'. C:/teeks99-09/run/boost_bb/src/build\project.jam:347: in load-jamfile from module project C:/teeks99-09/run/boost_bb/src/build\project.jam:64: in load from module project C:/teeks99-09/run/boost_bb/src/build\project.jam:105: in load-used-projects from module project C:/teeks99-09/run/boost_bb/src/build\project.jam:75: in load from module project C:/teeks99-09/run/boost_bb/src/build\project.jam:134: in load-parent from module project C:/teeks99-09/run/boost_bb/src/build\project.jam:538: in initialize from module project C:/teeks99-09/run/boost_bb/src/build\project.jam:373: in load-jamfile from module project C:/teeks99-09/run/boost_bb/src/build\project.jam:64: in load from module project C:/teeks99-09/run/boost_bb/src/build\project.jam:167: in project.find from module project C:/teeks99-09/run/boost_bb/src\build-system.jam:618: in load from module build-system C:/teeks99-09/run/boost_bb/src/kernel\modules.jam:294: in import from module modules C:/teeks99-09/run/boost_bb/src/kernel/bootstrap.jam:135: in module scope from module It looks like the last good run I had was on march 11, which corresponds to the same day as this commit to that project.jam: https://github.com/boostorg/build/commit/fda357a8f55a08535afff0a11eec50fca1… That file doesn't mean much to me, is it possible it is causing the issue? Thanks, Tom

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Moving sp_thread_pause, sp_thread_sleep to Core
by Christian Mazakas 02 Jun '23

02 Jun '23

Unordered's concurrent flat map contains a hand-rolled spinlock (graciously provided by Peter Dimov) but it contains a dependency on SmartPtr for the following two headers: #include <boost/smart_ptr/detail/sp_thread_pause.hpp> #include <boost/smart_ptr/detail/sp_thread_sleep.hpp> I advocate that we move these to Core. They're small, self-contained and are useful in broader contexts. Anyone have thoughts or objections? - Christian

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git hub discussions.
by Robert Ramey 31 May '23

31 May '23

As an experiment, I've added to github discussions for the safe_numerics library. The idea is to provide a place for feedback from users of the library. I'd be curious to hear other persons thoughts on this. https://github.com/boostorg/safe_numerics/discussions/133 Robert Ramey

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Re: [boost] Boost.Compat
by Peter Dimov 31 May '23

31 May '23

Ruben Perez wrote: > > So my suggestion is to create a separate library/repo, Boost.Compat > > (boostorg/compat, namespace boost::compat) for them. > > > > Thoughts? (Be sure to read the discussion in the PR as well.) > > > > I'm in favor of this. I agree with not allowing extensions, too. > > I think a light review should take place before inclusion. The suggested repository is now ready for light review at https://github.com/boostorg/compat, complete with its first component, an implementation of std::latch by Christian Mazakas. Everyone's light reviews are welcome.

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Sam review scheduled
by Ruben Perez 20 May '23

20 May '23

Hi all, I'm happy to announce that the Sam library, featuring asio-based synchronization primitives, is being proposed for Boost inclusion. Repo: https://github.com/klemens-morgenstern/sam Docs: https://klemens.dev/sam/ The library is being proposed by Klemens Morgenstern. The review will take place between May the 29th (Monday) and June the 8th (Thursday). I will be managing the review. Boost.Sam offers async asio-based synchronization primitives, similar to standard mutex, condition_variable, semaphore and barrier. It's geared towards library writers that require fine-grain control over their synchronization operations. You can contact both me and the author by mail or on the cpplang Slack. Kind regards, Ruben.

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Re: [boost] boost 1.82.0
by John Maddock 16 May '23

16 May '23

On 16/05/2023 02:39, Prabhakar Bhatt via Boost wrote: > Hi All, > > Recently we upgraded to Boost 1.82.0. > > We compiled the boost as : > > ./bootstrap.sh > --with-libraries=filesystem,system,program_options,iostreams,log,regex,stacktrace,thread > --without-icu > > When we tried to use the regex library and build Avro product we are > getting following error: > > Boost/boost_1_82_0/include/boost/regex/v4/cpp_regex_traits.hpp:1117: > undefined reference to > `boost::scoped_static_mutex_lock::scoped_static_mutex_lock(boost::static_mutex&, > bool)' > > Please can you help us in addressing the issue. Regex is now header only, *unless* you are building with a C++03 compiler (which is now deprecated), and will require linking to the external libboost_regex. John.

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Re: [boost] Determine socket is ipv4 or ipv6
by Gavin Lambert 16 May '23

16 May '23

On 16/05/2023 15:26, Tarun Batra wrote: > I have a code something like this: > > TcpConnection::pointer my_conn = GetConn(req); > > tcp::socket& my_socket = my_conn->getSocket(); > > tcp::resolver my_resolver(my_socket.get_executor()); > > > Is it possible to check if the my_socket is ipv4 socket or ipv6 socket? That depends exactly what you mean by that, but you're likely looking for something like: my_socket.remote_endpoint().address().is_v6() Doxygen doesn't do a very good job at navigating the type templates involved here; using your IDE's code completion is more successful.

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Reference section of Boost.Any leads to Boost.PFR
by Antony Polukhin 15 May '23

15 May '23

Hi, Just noted that clicking on "->" arrow at the developer preview of Boost.Any https://www.boost.org/doc/libs/develop/doc/html/any/ValueType.html leads to Boost.PFR reference section. No idea how is that possible. I'd appreciate help

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boost 1.82.0
by Prabhakar Bhatt 15 May '23

15 May '23

Hi All, Recently we upgraded to Boost 1.82.0. We compiled the boost as : ./bootstrap.sh --with-libraries=filesystem,system,program_options,iostreams,log,regex,stacktrace,thread --without-icu When we tried to use the regex library and build Avro product we are getting following error: Boost/boost_1_82_0/include/boost/regex/v4/cpp_regex_traits.hpp:1117: undefined reference to `boost::scoped_static_mutex_lock::scoped_static_mutex_lock(boost::static_mutex&, bool)' Please can you help us in addressing the issue. Thanks and Regards, Prabhakar

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