August 2026 - Boost - lists.boost.org

[boost][int128] Formal Review Result
by Arnaud Becheler 05 Aug '26

05 Aug '26

Dear Boost Community, As Review Manager for Candidate Boost.Int128, I have carefully reviewed and incorporated the community's feedback from July 22–31. I decided to ACCEPT Boost.Int128 into Boost. The library's well-defined scope, clear design, its excellent documentation, its proven track record in the wild (including in Boost.Decimal and in production codebases on multiple platforms, tested on bare metal), the author's responsiveness throughout the review, and the fact that all review issues/PRs have been tracked with the "Boost Review" label, resolved (see: https://github.com/cppalliance/int128/pulls?q=is%3Apr+is%3Aclosed+label%3A%… ), and merged on develop convinced me to accept the library. Every reviewer who cast a formal vote recommended acceptance, and the only conditional verdict rested on bugs that Matt resolved (and one feature request he could not: https://github.com/cppalliance/int128/issues/485 ). As for the details: ACCEPT (7) Rainer Deyke (July 27) (Undisclosed) John Maddock (July 27) (Undisclosed) Christopher Kormanyos (July 27) (collaborator with the author; not C++ Alliance) Pavel Pavlov (July 28) (Undisclosed) Peter Turcan (July 28) (C++ Alliance) Jamie Allsop (August 1) (Undisclosed) Nigel Stewart (August 1) (Undisclosed) ACCEPT CONDITIONALLY (1) Guillaume Dua (July 28–30) (Undisclosed) COMMENTS / NOT A FORMAL REVIEW Andrzej Krzemienski (August 2): on library-vs-builtin type semantics. Various Reddit reviewers (eisenwave/WG21, James20k, MarekKnapek, and others) contributed substantive technical feedback without a formal verdict. Jarod on French Discord: contributed a bug report without a formal verdict. NOTE: I also note that several reviewers and commenters appreciated that the library was available through a single-header aggregated file included by Compiler Explorer, making it extremely easy to experiment with, stress the implementation and review. I sincerely think this should become the norm, not the exception for future (small-ish?) libraries. The cost of aggregating the headers in CI is trivial and the benefit shows up in the numerous latent bugs surfaced by reviewers. CONCLUSION AND THANKS: Congratulations to Matt Borland on an excellent contribution, and my sincere thanks to everyone who took the time to review, test and debate. I must insist that identifying all those bugs early will make life infinitely easier for users and maintainers. Your time and effort are greatly appreciated. Have a wonderful week, Best wishes, Arnaud Becheler, Review Manager for Boost.Int128 ... and hopeful future Review Manager for Boost.256 ? ;)

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[release] Master branch is closed for the 1.92.0 release
by Ion Gaztañaga 05 Aug '26

05 Aug '26

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

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[multi] Multi Mini Review Begins Thursday
by Matt Borland 03 Aug '26

03 Aug '26

Hello, This is an announcement that the mini review of Multi [1] will begin on Thursday (August 6) and run through next Tuesday (August 11). The focus of this review will be the documentation, as that was identified as the weak point in the review earlier this year. This is the last scheduled review, so streak of reviews is nearly over. Thank you all for your participation. Matt Multi Review Manager [1] https://github.com/correaa/boost-multi

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[boost][int128] Formal Review Is Now Closed
by Arnaud Becheler 03 Aug '26

03 Aug '26

Good morning Boost Community, After a small extension over the weekend to allow potential reviewers to chime in, I am happy to declare that the Formal Review of Candidate Boost.Int128 is now closed! I will summarize the exchanges, count the votes and issue a statement in the next few days. I want to thank everyone who took part in the review and discussions, both on this mailing list and on other networks (Slack, Reddit, LinkedIn, Discord...): this was very helpful for both the Review Manager and the author. It is quite formidable to see what an open-source community can put together! Reviews like this are the closest thing C++ has to a sports team, and that was a very clean game :) Have a great week, Best wishes, Arnaud Becheler, Review Manager

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[boost][int128] Formal Review Begins Today (July 22-July 31)
by Arnaud Becheler 02 Aug '26

02 Aug '26

Dear Boost Community, I am very happy to open the Formal Review period for Candidate Boost.Int128 authored by Matt Borland, running from today, July 22nd to July 31st 2026. Int128 is a portable C++14 implementation of signed and unsigned 128-bit integers. It has no dependencies, is header-only, and can be consumed as a module in C++20. You can find the library and its documentation here: - https://github.com/cppalliance/int128/tree/boost_review - https://develop.int128.cpp.al/overview.html I could make examples work in Compiler Explorer: https://godbolt.org/z/5aM6K9b4r Although possibly not faithful to Matt's implementation, this CE link will be handy if you are in a rush but want to play with the library. Candidate Boost.Int128 serves as a practical solution to the partial (resp. absent) support of 128-bit integers by gcc/clang (resp. msvc), and as an alternative to projects with a heavy dependency footprint. For example Boost.Multiprecision offers 128-bit integers but drags 25 Boost modules which may not be acceptable when only a single type is required. We can expect this new lightweight library to interest anyone manipulating integers beyond the 64bit numeric range, for simple problems like when summing many 64-bits integers in an accumulator, computing a*b/c where the intermediate product overflows 64 bits, or in complex fields like cryptography, hashing, random number generation, precision arithmetic... Note: Due to the Boost release cycle, the master branch is frozen on all Boost projects. This had the inconvenient effect of preventing Matt from operating a cross-repo PR to enable GPU support with Boost.Charconv. Due to the lack of a practical solution, the CI on master will remain red until 1.92 ships. We kindly ask reviewers to focus on the boost_review branch. As always, we welcome all reviews, from quick impressions to detailed analysis. Your feedback helps ensure that the library meets Boost's high standards for correctness, performance, documentation, and design. If you’re interested in contributing a review, please post to the Boost mailing list during the review period. In your review please state whether you recommend to REJECT or ACCEPT the library into Boost, and whether you suggest any conditions for acceptance. Other questions you might want to answer in your review are: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problems tackled by the library? Thank you for your time, Have a wonderful week, Arnaud Becheler, Review Manager Boost.Int128

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