July 2025 - Boost - lists.boost.org

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 open for bug fixes
by Marshall Clow 28 Jul '25

28 Jul '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 August 6th, master closes for all changes. As always, the calendar is at https://www.boost.org/calendar — The release managers

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Boost 1.89.0.beta1 Asio potential bug
by Ruben Perez 27 Jul '25

27 Jul '25

I'd like to call attention on this problem I had with Asio, which I think is a legitimate bug: https://github.com/chriskohlhoff/asio/issues/1650 It's currently making Boost.MySQL CIs fail. It'd be good if it could be fixed for the release. Thanks, Ruben.

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[release] Boost 1.89.0 Beta 1 Release Candidate 1 is available
by Marshall Clow 23 Jul '25

23 Jul '25

Available at: https://archives.boost.io/beta/1.89.0.beta1/source/ The SHA256 checksums are as follows: bf45af4a58f39c2ec374ef6e70b26859b786ba2ed087bc869d92a2b4de14e0d2 boost_1_89_0_b1_rc1.zip f255b4a31558b3fb81be1dc7e8b367fb9997dbe5e71da98a730c681377abffa9 boost_1_89_0_b1_rc1.7z 984ee193ddf192795ba635d4c73b2b43e1e596995d7ce5519a3a72fab9bc0b40 boost_1_89_0_b1_rc1.tar.gz 9ece9af2b243f90b76f679b278b512b6589c7843e4dd54cffcb719bbc0801998 boost_1_89_0_b1_rc1.tar.bz2 As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. -- The Release Managers

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Asio: can a asyn_write handler came after a asyn_read handler?
by Dennis Luehring 22 Jul '25

22 Jul '25

Asio 1.88 im currently trying to understand a TCP server/client implementation at a new customer project the statemachine of the user code bases on the fact that a handler of an async_write needs to always comes before the handler of an async_read i don't think that is guaranteed, is it? this is the redcuded scenario: an async_read wait for a single reply from the connected sever a single async_write is done that make the server reply a single paket in the waiting aysnc_read is it possible that the async_write handler comes after the async_read handler? i had a look at the Asio implementation for Windows and it seems that the write handler will be come before - but im not that deep in the implementation

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Adding optional<T&> find like method to associative containers in boost.
by Ivan Matek 18 Jul '25

18 Jul '25

Hi everybody, I presume somebody thought of this before but for some reason it never happened, but just in case it was never discussed I wonder if people here believe adding an nicer version of find(with different name obviously) to associative containers in boost would be beneficial? Since boost::optional allows references this would work. I presume naming is what most people will have strong feeling about. I personally prefer ofind/oat since I love short names, Barry suggested different names in his blog <https://brevzin.github.io/c++/2023/05/23/map-api/>, e.g. try_at. boost::optional did not get all the updates C++23 std::optional got, e.g. transform that make this usage compose nicely, but those could be added to boost::optional.

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[release] Boost 1.89.0 beta 1 released
by Marshall Clow 17 Jul '25

17 Jul '25

Boost release 1.88.0 beta 1 is now available at: https://archives.boost.io/beta/1.89.0.beta1/source/ The SHA256 checksums are: 9ece9af2b243f90b76f679b278b512b6589c7843e4dd54cffcb719bbc0801998 boost_1_89_0_b1.tar.bz2 bf45af4a58f39c2ec374ef6e70b26859b786ba2ed087bc869d92a2b4de14e0d2 boost_1_89_0_b1.zip f255b4a31558b3fb81be1dc7e8b367fb9997dbe5e71da98a730c681377abffa9 boost_1_89_0_b1.7z 984ee193ddf192795ba635d4c73b2b43e1e596995d7ce5519a3a72fab9bc0b40 boost_1_89_0_b1_rc1.tar.gz Release notes (still need updates): https://original.boost.org/users/history/version_1_89_0.html Please try the beta and report any problems you encounter. Thanks to everyone who contributed to the release. -- Boost Release Team

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Asio and post-quantum cryptography
by Jonathan Wakely 17 Jul '25

17 Jul '25

Hi, I am trying to find out if Asio is usable with new post-quantum cryptographic algorithms in OpenSSL, e.g. when using TLS 1.3 connections and pure ML-DSA TLS certificates. The main question is whether Asio is affected by the much larger size of the new certificate types. My understanding is that Asio doesn't care about those sizes, it has no hardcoded buffers for keys and certs, and just uses buffers provided by users of the library. So if a user wants to support larger certs, they need to provide larger buffers, and Asio will pass those buffers through to OpenSSL. But I don't know if any new member functions might be needed for the ssl context object. Has anybody tried using Asio with post-quantum support in openssl? Or is it something that will take new development effort in Asio? Thanks, Jonathan (apologies if you get this mail twice, I think my first attempt didn't get through because I sent from a different address that isn't subscribed)

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[1.89] Authors: please provide your release notes
by Joaquin M López Muñoz 11 Jul '25

11 Jul '25

Procedure is as usual, submit a PR against https://github.com/boostorg/website/blob/master/feed/history/boost_1_89_0.q… Thank you! Joaquín M López Muñoz

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[Release] Master branch is now closed for the beta release
by Marshall Clow 10 Jul '25

10 Jul '25

Master is closed for all changes. See the release schedule at: https://www.boost.org/calendar -- Release managers

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New website and release notes
by Ruben Perez 08 Jul '25

08 Jul '25

Hi all, Now that we have the new website, has the procedure to submit release notes changed? This page: https://www.boost.org/doc/contributor-guide/release-notes.html lists the old procedure of using quickbook files, but if I remember correctly this was one of the things that were meant to change with the new website. Thanks, Ruben.

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[release] Master branch closing for Beta release TOMORROW
by Marshall Clow 08 Jul '25

08 Jul '25

After tomorrow: Release branch closed for all changes. Next milestone:July 16 - 1.89.0 beta 1 Calendar is here: https://www.boost.org/calendar — The release managers

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Reserved identifiers used for include guards
by Gennaro Prota 08 Jul '25

08 Jul '25

Hi, I found that many include guard macros in Boost contain "__HPP" (note the double underscore). It would be nice to reduce those underscores to one, because identifiers containing two consecutive underscores "are reserved to the implementation for any use" (C++ standard, [lex.name]). -- Gennaro Prota <https://prota.dev>

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[release] Master branch now closed for major changes
by Marshall Clow 03 Jul '25

03 Jul '25

Release closed for major code changes. Still open for serious problem fixes and docs changes without release manager review. Next deadline: 9-July - Master branch will close for the 1.89.0 beta release. Calendar: https://www.boost.org/calendar/ — The release managers

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Template repository for header only library for Boost
by cppleo＠ya.ru 03 Jul '25

03 Jul '25

Hello, everyone. Does anybody know how to create repository for Boost header only library, which successfully builds using b2 and CMake with quickbook documentation and tests? Thanks! -- wbr, Leonid

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[release] Deadline for MAJOR changes for boost 1.89.0 is tomorrow.
by Marshall Clow 02 Jul '25

02 Jul '25

The calendar is at: https://www.boost.org/calendar/ — Marshall

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