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Senior students eager to write a graduation work
by Antony Polukhin 19 Aug '25

19 Aug '25

Hi, I've got in touch with some professors in IT universities. They have a bunch of senior students that are in search of projects for their graduation work. Seems that Boost Libraries could benefit from that. Mentoring a senior student usually takes less time than implementing something on your own. Do you have any Boost related projects that could be done by students? Is there a list of such projects and mentors anywhere? -- Best regards, Antony Polukhin

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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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