April 2025 - Boost - lists.boost.org

boost::python and Python 3.12
by Tom Kacvinsky 13 Apr '25

13 Apr '25

While working on a project to upgrade an embedded Python interpreter (to Python 3.12), which uses boost::python, I noticed the structs from the Python C API now have more members and those extra struct members were not populated in the boost::python code. In particular I was bit by the enum module crashing our application startup. I noticed this with boost 1.78, but I found the same problematic code in the release that was current as of two months ago (1.87.0, I think). I got things to compile and run, but my approach was to just make the code Python 3.12 compliant. I can prepare a patch that has the appropriate macro guards for populating the structs as they relate to different Python versions. I'll read the boost developers guide and follow the necessary steps to submit a fix. Regards, Tom

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[release] Boost 1.88.0
by Marshall Clow 13 Apr '25

13 Apr '25

Release 1.88.0 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 two new libraries: * Hash2: An extensible hashing framework, from Peter Dimov and Christian Mazakas. * MQTT5: MQTT5 client library built on top of Boost.Asio, from Ivica Siladić, Bruno Iljazović, and Korina Šimičević. as well as numerous enhancements and bug fixes for existing libraries. For details, including download links, see <http://www.boost.org/users/news/version_1.88.0> You can also download directly from: <https://archives.boost.io/release/1.88.0/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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Git Debug Branch
by Robert Ramey 11 Apr '25

11 Apr '25

Sometime ago someone made the case that we should drop the Debug branch in the git storage for the libraries. I found the case pretty convincing and endorsed the change. However, it seems that the idea was not well received and the idea was not adopted. I hope my endorsement wasn't responsable for it's being dismissed. Now it seems that the idea HAS been adopted. I've found in both the libraries I maintain, some "maintainers" check into the master branch directly from a feature branch used for debugging. This was kind of problematic as the debug and master branch were no longer easily understood by doing a diff. Worse, other "maintainers" check into the debug branch in the traditional way leaving the merge to master as a separate operation in the traditional manner. My custom has been to merger to master just before the next release. I only dip into maintenance occasionally, so I don't remember all the details and I have to spend a lot of time looking at who did what. So, I'm announcing that I am unilaterally declaring soon I will be leaving the debug branch aside and not use it in the future. Those who have the authority to directly make changes in these libraries (as opposed do making a merge request) should know that any pushes to the debug branch will be lost. Robert Ramey

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is it possible to run the tests on a different platform without the build-environment?
by Dennis Luehring 11 Apr '25

11 Apr '25

im building boost on a Win11 and run my boost-libs using application on an different/customized Win10 platform normally im running at least once the tests of the used libs when building boost cd boost-root\libs\asio\test b2 test the tests getting build and runned - nice and perfect but is there a way to run the builded tests on my other platform without installed development tools? its a very small reduced pseudo embedded Win 10 system

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question re boost instalation
by Robert Ramey 11 Apr '25

11 Apr '25

I'm following the "getting started" part of the boost documentation. When I get to here - I get some message I don't understand. Anyone have any ideas? Robert Ramey $b2 install --prefix=bin/osx /Users/robertramey/WorkingProjects/modular-boost/tools/build/src/build/property.jam:363: in validate1 from module property error: Invalid property '<valgrind>on': unknown feature 'valgrind'. /Users/robertramey/WorkingProjects/modular-boost/tools/build/src/build/property.jam:372: in property.validate from module property /Users/robertramey/WorkingProjects/modular-boost/tools/build/src/tools/features/variant-feature.jam:102: in variant from module variant-feature libs/beast/Jamfile:44: in modules.load from module Jamfile</Users/robertramey/WorkingProjects/modular-boost/libs/beast> /Users/robertramey/WorkingProjects/modular-boost/tools/build/src/build/project.jam:544: in load-jamfile from module project /Users/robertramey/WorkingProjects/modular-boost/tools/build/src/build/project.jam:68: in project.load from module project Jamroot:450: in modules.load from module Jamfile</Users/robertramey/WorkingProjects/modular-boost> /Users/robertramey/WorkingProjects/modular-boost/tools/build/src/build/project.jam:544: in load-jamfile from module project /Users/robertramey/WorkingProjects/modular-boost/tools/build/src/build/project.jam:68: in load from module project /Users/robertramey/WorkingProjects/modular-boost/tools/build/src/build/project.jam:201: in project.find from module project /Users/robertramey/WorkingProjects/modular-boost/tools/build/src/build-system.jam:618: in module scope from module build-system $

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is is possible to downsize the boost installation folder
by Dennis Luehring 10 Apr '25

10 Apr '25

im building boost 1.87 and i only need thread+asio building: cd /home/test wget https://archives.boost.io/release/1.87.0/source/boost_1_87_0.tar.bz2 tar -xf boost_1_87_0.tar.bz2 cd boost_1_87_0 ./bootstrap.sh --prefix=/home/test/boost_1_87_0_installed ./b2 variant=release --with-thread install the resulting install folder /home/test/boost_1_87_0_installed lib folder is ~500 KB include is ~142 MB is it possible to only have the needed library includes in the include folder?

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[release] Boost 1.88.0 Release Candidate 1 is available
by Marshall Clow 10 Apr '25

10 Apr '25

The first release candidates for the 1.88.0 release are now available at: <https://archives.boost.io/release/1.88.0/source/> The SHA256 checksums are as follows: 8ee21476f1aca1978339f0f4a218b9b8a6746eec83070f32630f97b09c7e91b7 boost_1_88_0_rc1.zip e84a33716a31c1c8cb00783a411630d41c008e9364002dc0fe55aea4f54f4726 boost_1_88_0_rc1.7z 46d9d2c06637b219270877c9e16155cbd015b6dc84349af064c088e9b5b12f7b boost_1_88_0_rc1.tar.bz2 3621533e820dcab1e8012afd583c0c73cf0f77694952b81352bf38c1488f9cb4 boost_1_88_0_rc1.tar.gz 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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[OpenMethod] review
by Дмитрий Архипов 10 Apr '25

10 Apr '25

I'm trying to get a Boost review scheduled for the proposed Boost.OpenMethod. I sent an email directly to review wizards but haven't gotten a response. Can anyone help me get in touch with the wizards?

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[bloom] Candidate Boost Bloom library: request for endorsements
by Joaquin M López Muñoz 09 Apr '25

09 Apr '25

Hi, I've been working during the last few months in a library I would like to propose for Boost: Repo: https://github.com/joaquintides/bloom Docs: https://master.bloom.cpp.al/ (Candidate) Boost.Bloom provides the class template boost::bloom::filter that can be configured to implement a classical Bloom filter as well as variations discussed in the literature such as block filters, multiblock filters, and more. #include <boost/bloom/filter.hpp> #include <cassert> #include <string> int main() { // Bloom filter of strings with 5 bits set per insertion using filter = boost::bloom::filter<std::string, 5>; // create filter with a capacity of 1'000'000 **bits** filter f(1'000'000); // insert elements (they can't be erased, Bloom filters are insert-only) f.insert("hello"); f.insert("Boost"); //... // elements inserted are always correctly checked as such assert(f.may_contain("hello") == true); // elements not inserted may incorrectly be identified as such with a // false positive rate (FPR) which is a function of the array capacity, // the number of bits set per element and generally how the boost::bloom::filter // was specified if(f.may_contain("bye")) { // likely false //... } } If you deem the library interesting and think it stands a chance of being accepted into Boost, allow me to request your endorsement. Best, Joaquin M Lopez Munoz

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Call traits
by Robert Jones 07 Apr '25

07 Apr '25

Hi All Has the meat of Boost Call Traits ever made it into the stdlib? It seems like an obvious candidate, but I can't see it. Stdlin <type_traits> seems to be a very different offering, but maybe I'm missing something? Kind Regards Rob.

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