December 2019 - Boost - lists.boost.org

Re: [boost] Assuming maintainership of boostorg/io
by Bjorn Reese 14 Dec '19

14 Dec '19

On 2019-12-14 17:31, Glen Fernandes via Boost wrote: > I'd like to take on maintainership of IO, as suggested by Peter. +1

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Attn: Maintainer of boost/bind.hpp
by Niall Douglas 13 Dec '19

13 Dec '19

In boost/bind.hpp there is injection of a boost namespace contents into the global namespace: ```c++ #include <boost/bind/bind.hpp> #ifndef BOOST_BIND_NO_PLACEHOLDERS #if defined(BOOST_CLANG) # pragma clang diagnostic push # if __has_warning("-Wheader-hygiene") # pragma clang diagnostic ignored "-Wheader-hygiene" # endif #endif using namespace boost::placeholders; #if defined(BOOST_CLANG) # pragma clang diagnostic pop #endif #endif // #ifndef BOOST_BIND_NO_PLACEHOLDERS ``` The fact that Boost actually disables the relevant compiler warning makes this particularly insidious. No modern C++ library should ever do "using namespace" into the global namespace in its public headers. Please fix this in the next release of Boost. Niall

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Attn: Maintainers of Iterator, Python, ASIO, Detail, Core, Graph, QVM, Exception
by Niall Douglas 13 Dec '19

13 Dec '19

Dear maintainers of Iterator, Python, ASIO, Detail, Core, Graph, QVM, Exception, Please find attached a list of macros in your libraries without BOOST_ prefixing, as is required by Boost library guidelines. If you could fix these promptly, it would be appreciated. Niall

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Re: [boost] [release] Boost 1.72.0 has been released
by Glen Fernandes 12 Dec '19

12 Dec '19

Andrey wrote: > In release notes, New Libraries says TODO. Also on the main page it showed a blank list of updated libraries. Both should be fixed now: https://github.com/boostorg/website/commit/3f37b654d7126c0ad312e50d227c03d2… https://github.com/boostorg/website/commit/7c897e8c768cf28113ba07488a6b5030… Glen

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[release] 1.73.0 open for merging
by Marshall Clow 11 Dec '19

11 Dec '19

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 Release schedule explanation: https://github.com/boostorg/boost/wiki/Release-Schedule Release practices for developers: http://svn.boost.org/trac/boost/wiki/ImprovingPractices -- The Boost Release Team

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[release] Boost 1.72.0 has been released
by Marshall Clow 11 Dec '19

11 Dec '19

Release 1.72.0 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 new libraries and numerous enhancements and bug fixes for existing libraries. For details, including download links, see < http://www.boost.org/users/news/version_1.72.0> You can also download directly from: < https://dl.bintray.com/boostorg/release/1.72.0/> 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, Michael Caisse

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[release] Boost 1.72.0 Release Candidate 2
by Marshall Clow 10 Dec '19

10 Dec '19

The second release candidates for the 1.72.0 release are now available at: <https://dl.bintray.com/boostorg/release/1.72.0/source/> The SHA256 checksums are as follows: 247a91dd7e4d9dd3c4b954b532fbc167ba62dc15ab834e5ad893d7c3f9eb5f0f ./boost_1_72_0_rc2.7z 59c9b274bc451cf91a9ba1dd2c7fdcaf5d60b1b3aa83f2c9fa143417cc660722 ./boost_1_72_0_rc2.tar.bz2 c66e88d5786f2ca4dbebb14e06b566fb642a1a6947ad8cc9091f9f445134143f ./boost_1_72_0_rc2.tar.gz 8c20440aaba21dd963c0f7149517445f50c62ce4eb689df2b5544cc89e6e621e ./boost_1_72_0_rc2.zip Changes since RC1: * A change to Boost.Proto that would cause compilation failures on the latest MS compiler. 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 Boost Release Managers

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Interest in a C++20 Unit Testing Framework?
by Krzysztof Jusiak 10 Dec '19

10 Dec '19

Hi, I was wondering whether there is any interest in exploring a C++20 single header/single module, macro-free Unit Testing Framework with no dependencies? Github: https://github.com/boost-experimental/ut Additional links: - Try it online: https://godbolt.org/z/uVDxkW - Benchmarks: https://github.com/boost-experimental/ut#benchmarks - How it works?: https://github.com/boost-experimental/ut#how-it-works Thanks, Kris

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Re: [boost] [STLInterfaces] only three operations?
by Zach Laine 09 Dec '19

09 Dec '19

On Mon, Dec 9, 2019 at 12:55 PM Andrzej Krzemienski <akrzemi1(a)gmail.com> wrote: > > > pon., 9 gru 2019 o 17:32 Zach Laine <whatwasthataddress(a)gmail.com> > napisał(a): > >> >> >> >>> Same with the iterator in the flight map: >>> >>> >>>> https://github.com/tzlaine/flat_map/blob/master/implementation/flat_map#L266 >>>> >>> >>> According to C++17 requirements this shouldn't have been a >>> random_access_iterator. >>> >>> Also, std::ranges::sort() will not work with it. But this is not >>> directly related to `iterator_interface` >>> >> >> I don't know why you think that. ranges::sort() is designed to work with >> std::random_access_iterator, which is designed explicitly to support proxy >> iterators. Casey and Eric have assured me that this "just works". Do you >> know of a reason why it does not? If so, you've spotted a defect, and we >> should file an LWG issue immediately. >> > > Not sure if it is a defect. An iterator that returns a proxy as > ::reference can be a valid random_access_iterator. However, > std::ranges::sort(), apart from a random_access_iterator requirement, has > one more requirement: sortable<>: (http://eel.is/c++draft/sort) which > boils down to indirectly_writable ( > http://eel.is/c++draft/iterator.concept.writable) This last concepts > puts severe restrictions on proxy types. For instance you should be able to > assign to them when they are const-qualified. So a type like std::tuple<> > of references will not work. But you will be able to design a sufficiently > bizarre proxy type that will work with std::ranges::sort(), So in a way it > will work with *some* reference proxies. > Ok, I just realized this somehow drifted off-list. Re-adding the list... This is the definition of indirectly_writable: template<class Out, class T> concept indirectly_writable = requires(Out&& o, T&& t) { *o = std::forward<T>(t); // not required to be equality-preserving *std::forward<Out>(o) = std::forward<T>(t); // not required to be equality-preserving const_cast<const iter_reference_t<Out>&&>(*o) = std::forward<T>(t); // not required to be equality-preserving const_cast<const iter_reference_t<Out>&&>(*std::forward<Out>(o)) = std::forward<T>(t); // not required to be equality-preserving }; All you need to make this work is a reference type for which all those are well-formed. If you pick std::tuple, it all just works. If you pick std::pair, only the first two expressions in the requires expression work. You can easily define UDTs for which this concept works too, of course. Zach

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Interest in an audio filtering / algorithm Library?
by Vinnie Falco 09 Dec '19

09 Dec '19

Is there any interest in having a new libraries for Boost that is focused on the audio domain (but with portions applicable generically)? I'm thinking about a library that does stuff like: * finite impulse response filtering * infinite impulse response filtering * time stretching, resampling * audio synthesis * audio algorithms * mixing * plenty of ready-to-run filters: - low pass, high pass, band pass - echo, reverb, flanger, phaser and the like This is a pure math library, no actual audio. To get an idea of the algorithms and use-cases check out my DSPFiltersDemo program (press Download Now): <https://github.com/vinniefalco/DSPFiltersDemo> Please note, my library is not what is being proposed, this would be a new library from a domain expert (not me). Thanks

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