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Histogram test failure on master branch
by Peter Dimov 28 Nov '25

28 Nov '25

I'm seeing a new failure on the master branch: 883/2538 Test #977: run-boost_histogram-histogram_ostream_ascii_test ......................................***Failed 0.00 sec /home/runner/work/boost/boost/libs/histogram/test/histogram_ostream_ascii_test.cpp(67): test 'str(h).c_str() == expected' ('BEGIN histogram(integer(0, 3, options=underflow | overflow))END' == 'BEGIN histogram(integer(0, 3, options=underflow | overflow)) +------------+ -1 0 | | 0 -1 |=== | 1 3 | ======== | 2 2 | ====== | 3 0 | | +------------+ END') failed in function 'void run_tests() [with Tag = boost::histogram::dynamic_tag]' 1 error detected. Histogram's master hasn't changed for 5 months, so this is probably caused by something else. The CI run is https://github.com/boostorg/boost/actions/runs/19686425029/job/56392904495 and it's being done in response to an Iterator change on master, although the change itself is non-functional.

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[release] Master branch is now open for bug fixes
by Marshall Clow 25 Nov '25

25 Nov '25

Hi, The master branch is now open for bug fixes, test and documentation changes, but please follow the policy described in: https://github.com/boostorg/wiki/wiki/Releases%3A-Beta-Merge-Policy The next deadline: On December 3rd, master closes for all changes. As always, the calendar is at https://www.boost.org/calendar — The release managers

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boost.org/patches no longer exists
by thaines.astro＠gmail.com 21 Nov '25

21 Nov '25

The release notes have links to relevant post-release patches linked under https://www.boost.org/patches, but that URI no longer exists. For example, https://www.boost.org/releases/1.73.0/ refers to https://www.boost.org/patches/1_73_0/0001-outcome-assert.patch Thanks. - Tim P.S. Apolgies if this is a duplicate. My previous email seems to have never made it to the list.

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Re: [release] Master branch is now open for bug fixes
by Mungo Gill 21 Nov '25

21 Nov '25

I don't know if this impacts the release but when I build my own library I am seeing build errors at the moment on C++11 clang. In file included from libs/buffers/test/unit/asio.cpp:17: ./boost/asio/buffer.hpp:332:7: error: use of the 'deprecated' attribute is a C++14 extension [-Werror,-Wc++14-extensions] class BOOST_ASIO_DEPRECATED_MSG( ^ ./boost/asio/detail/config.hpp:1373:46: note: expanded from macro 'BOOST_ASIO_DEPRECATED_MSG' # define BOOST_ASIO_DEPRECATED_MSG(msg) [[deprecated(msg)]] ^ 1 error generated. (see also https://github.com/chriskohlhoff/asio/issues/1683 )

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Advanced Java Full Stack Developer Course in Ameerpet | IntelliQ IT
by bajiintelliqit＠gmail.com 20 Nov '25

20 Nov '25

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State of the art regarding bitmasks
by Ruben Perez 19 Nov '25

19 Nov '25

Hi all, I've recently found myself frustrated due to the amount of boilerplate that bitmask types require. Say, for example, asio::cancellation_type_t: https://www.boost.org/doc/libs/latest/boost/asio/cancellation_type.hpp When using enum class to avoid pouring identifiers into the parent namespace, you need to re-implement all the bitwise operators. This is not a lot of work, but is empty boilerplate, and implies adding tests and docs. Reflection may aid with this. I've written a small proof of concept: https://access_refl.compiler-explorer.com/z/jdaxf9q54 Pasting here the basics, just in case: namespace bitmasks { struct bitmask_t {}; inline constexpr bitmask_t bitmask {}; // Checks that t has our annotation consteval bool has_bitmask_annotation(std::meta::info t) { ... } template <class E> concept BitmaskType = std::is_scoped_enum_v<E> && has_bitmask_annotation(^^E); } // Intentionally in the global namespace template <bitmasks::BitmaskType E> E operator|(E e1, E e2) { using U = std::underlying_type_t<E>; return static_cast<E>(static_cast<U>(e1) | static_cast<U>(e2)); } The idea is that you use the [[=bitmask]] annotation on your enum, and you get all the operators for free. I could also add optional pretty-printing. Questions: * Do you think this is a problem worth solving, or am I being too picky? * Do we already have something similar in Boost? I've found a BOOST_BITMASK macro (https://www.boost.org/doc/libs/latest/boost/detail/bitmask.hpp) but it doesn't seem to be public. * Do you think the approach shown above is sound? In particular, operators are in the global namespace so that they work with any enum in any namespace correctly annotated. * Do you think such a small component could be useful in Boost at some point? Thanks, Ruben.

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Boost Libraries are Obsolete
by Vinnie Falco 18 Nov '25

18 Nov '25

I believe some Boost libraries become obsolete by newer versions of C++. For example, boost::filesystem, Boost.CharConv, and Boost.Variant could be considered obsolete in versions C++17 and later as these facilities are in the standard. It can be tricky to figure out what is obsolete. Is boost::shared_ptr obsolete in C++11? Probably not since it has features not found in the standard. Anyway, I'm not trying to figure this out for all the libraries. For boost.org it might be nice to let users specify the "minimum version of C++" which they use. And they can opt in to filtering the Libraries based on this minimum version. Someone who is using C++23 can choose not to see libraries like Boost.Align, Boost.Assign, or Boost.Atomic. We will need to add metadata to each library's repository to know the maximum version. What do you all think about this? -- Regards, Vinnie Follow me on GitHub: https://github.com/vinniefalco

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lists.boost.org - email is showing up for some registered users instead of name
by Andrej 17 Nov '25

17 Nov '25

Hi! Noticed posting on `Boost-users` that emails are showing up for some users, though they have a name in their profiles. Which is undesirable, since those pages are publicly available. E.g. see: https://lists.boost.org/archives/list/boost-users@lists.boost.org/thread/JB… https://lists.boost.org/archives/list/boost-users@lists.boost.org/thread/LD…

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boost.org/patches no longer exists
by Tim Haines 15 Nov '25

15 Nov '25

The release notes have links to relevant post-release patches linked under https://www.boost.org/patches, but that URI no longer exists. For example, https://www.boost.org/releases/1.73.0/ refers to https://www.boost.org/patches/1_73_0/0001-outcome-assert.patch Thanks. - Tim

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The Master branch is now CLOSED for the beta release
by Marshall Clow 15 Nov '25

15 Nov '25

Please do not commit or merge to the master branch The Beta RC1s will be available later today. — The release managers.

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