November 2025 - Boost - lists.boost.org

[release] Master branch is now open for bug fixes
by Marshall Clow 22 Nov '25

22 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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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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utility::string_view and core::detail::string_view
by Vinnie Falco 17 Nov '25

17 Nov '25

On Thu, Oct 23, 2025 at 4:17 AM Dmitry Arkhipov via Boost < boost(a)lists.boost.org> wrote: > Url's and Charconv's maintainers decided > to not play along with the charade and reference boost::core::string_view > directly with the obvious drawback that that type is not documented > anywhere. > core::detail::string_view was added because this pull request FROM 2018 (seven years ago) was rejected: https://github.com/boostorg/utility/pull/51 We really need to fix this properly. In my opinion the maintainer of utility::string_view made the wrong choice when they rejected the pull request to make the constructors more useful. The consequence is that several Boost authors now use core::detail::string_view because it better satisfies user needs. At a time when people complain that Boost has its own version of std types, it would be best if we could come together and sort this. I would like to see the change which motivated core::detail::string view get applied to utility::string_view. Then we can change core::detail::string_view to be a deprecated alias, and after one release we can remove it. This solves everyone's problem: 1. Users get a type that works 2. Folks are not triggered by having two string views 3. Every library doesn't have to lift string_view into its own namespace 4. Cross-linking in documentation becomes possible With each new version of C++ we are asking more and more of Boost users. We are asking them to opt-in to our ecosystem which includes its own types similar yet sometimes incompatible with the standard types. It is our responsibility to make sure that we respect the user's trust, and deliver types which work for them. boost::utility::string_view breaks that trust at a time when we cannot afford to alienate. The consequence of the decision not to be flexible with the utility::string_view API is that now we have two string views. We have documentation issues. We have discovery issues. There is strife within the community. Yet more and more libraries are choosing core/detail/string_view.hpp instead of utility/string_view.hpp, simply because the core version works better. It is in the project's best interest to show the C++ community writ large that we can adapt and satisfy user needs. Lets do that by resolving the two string views. Thanks

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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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