August 2025 - Boost - lists.boost.org

Boost 1.90.0 Release Notes
by Sam Darwin 21 Aug '25

21 Aug '25

Boost 1.90.0 should be able to use the new process for Release Notes. This is already enabled in the code. - Create a release notes file boost_1_90_0.adoc at https://github.com/boostorg/website-v2-docs/tree/develop/release-notes/boos… . PRs go to the 'develop' branch. - Admins merge to the master branch of website-v2-docs once a week. - Github Actions automatically uploads that to s3. /release-notes/master/boost_1_90_0.adoc - website-v2 versions/releases.py will discover the adoc. If that file exists it takes precedence over the previous methods. Let's be sure a file is there during the beta release.

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[Release] The master branch is now open
by Marshall Clow 15 Aug '25

15 Aug '25

Thank to everyone for their patience. The next release cycle will begin in late October — The release managers

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[release] Boost 1.89.0
by Marshall Clow 15 Aug '25

15 Aug '25

Release 1.89.0 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. The release contains one new library: * Bloom: Bloom filters, from Joaquín M López Muñoz. as well as numerous enhancements and bug fixes for existing libraries. For details, including download links, see <http://www.boost.org/users/news/version_1.89.0> You can also download directly from: <https://archives.boost.io/release/1.89.0/source/> 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. -- The Boost Release Team Marshall Clow, Glen Fernandes, Ion Ion Gaztañaga

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Updated Release Links
by Robert Beeston 14 Aug '25

14 Aug '25

Good day, There were some issues with the release links, the corrected ones are below: For details, including download links, see https://www.boost.org/releases/1.89.0/ You can also download directly from: https://archives.boost.io/release/1.89.0/source To install this release on your system, see http://www.boost.org/doc/user-guide/getting-started.html *Rob Beeston* Creative Director C++ Alliance cppalliance.org

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Release Report for v1.89
by Robert Beeston 14 Aug '25

14 Aug '25

Here is the link for the 1.89 Release Report: https://downloads.cppalliance.org/reports/boost_1_89_0_release_report.pdf Please let us know if you have suggestions for future reports! *Rob Beeston* Creative Director C++ Alliance cppalliance.org

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Why no "w != NULL" assertion before boost/intrusive/rbtree_algorithms.hpp:511 like before the line 476?
by achinkoff＠gmail.com 12 Aug '25

12 Aug '25

Boost version: latest release file: boost/intrusive/rbtree_algorithms.hpp function: rebalance_after_erasure_restore_invariants in this if-branch ``` if(x == x_parent_left){ //x is left child ``` there is "w != NULL" assertion before variable 'w' access: ``` BOOST_INTRUSIVE_INVARIANT_ASSERT(w); if(NodeTraits::get_color(w) == NodeTraits::red()){ ``` but in else-branch there is no same assertion before variable 'w' access: ``` if(NodeTraits::get_color(w) == NodeTraits::red()){ ``` Why? Are there no assertion in else-branch intentionally due to the rbtree structure itself? Thanks.

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A proposal for a modern build-system
by Hassan Sajjad 08 Aug '25

08 Aug '25

Hi. I compiled 25 Boost libraries with C++20 header-units, including examples and Tests of a few. This resulted in a 1.44x speed-up if we exclude the scanning. Scanning was as slow as the header-unit build. I have a solution for that. I am sending this paper (Making some final edits) https://htmlpreview.github.io/?https://github.com/HassanSajjad-302/iso-pape… , which allows for a build-system to use a scanning-less approach to build header-units.This method requires only minimal modifications to the compiler and enables memory-mapped file sharing, which significantly reduces filesystem overhead and further boosts speed. My proposal for a scanning-less approach will allow HMake to have another amazing feature, monolithic Big header-units. BigHu will allow you to map all the headers from a directory to a single header-unit. This header-unit includes all these header-files and consumes them as header-files. Now, whenever the compiler requests a header-unit from this directory, the build-system instead sends this consolidated BigHu. This will not only improve the clean build speed, because of fewer process launches. But also massively boosts the rebuild speed as few header-units need to be read instead of lots of files. No source-code editing will be needed to use this feature. And you will have the option to either build a library as BigHu (if you don't mean to edit it) or as small header-units (if you are working on it). HMake will soon support compile_commands.json, which I guess can work fine with header-units. Thus you can benefit from both, faster compilation and working intelliscence. The API shown in hmake.cpp is a work in progress. HMake build-system benefits are numerous, even if we leave out the header-units support. This makes it a perfect replacement for B2. I believe we can complete the switch in the next 2 months. And if some compiler supports my paper, we get >3x faster compilation as well. Best, Hassan Sajjad

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[release] Master branch is now closed for the release
by Marshall Clow 07 Aug '25

07 Aug '25

Master is closed for all changes. See the release schedule at http://www.boost.org/calendar — The release managers

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C++26 Reflection in Boost
by Vinnie Falco 06 Aug '25

06 Aug '25

Which Boost libraries would benefit from implementing C++26 reflection? For my libraries that includes: Boost.JSON what other libraries?

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[release] The Master branch will be closing for the 1.89.0 release on Wednesday, 6-August
by Marshall Clow 06 Aug '25

06 Aug '25

Calendar is here: https://www.boost.org/calendar Current status of the master branch: Master is open for bug fixes and documentation updates. Other changes by permission of a release manager. — The release managers

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