May 2019 - Boost - lists.preview.boost.org

[graph] Plans to upgrade algorithms with Boost.Parameter named arguments
by Cromwell Enage 03 May '19

03 May '19

Hello, everyone! With the most significant changes to Boost.Parameter now in both the 'master' and 'develop' branches, one of my next major goals is to prepare a pull request to incorporate Boost.Parameter named arguments into Boost.Graph algorithms that currently use bgl_named_params. My personal fork, <https://github.com/CromwellEnage/graph>, has a working version of such algorithms. However, I'd like your feedback on how to upgrade the corresponding documentation. I have a rough draft for documenting the Boost.Parameter-enabled A* algorithms here for your review: < https://github.com/CromwellEnage/graph/blob/develop/doc/astar_search.html>. Please suggest improvements or state if you are sufficiently satisfied with its current form to be able to use the A* algorithms with Boost.Parameter named arguments. I plan to use the same documentation style for the other affected algorithms. Regards, Cromwell D. Enage

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[disjoint_sets] content moved into boostorg/graph
by James E. King III 02 May '19

02 May '19

The CMT was maintaining a standalone repository for one class, disjoint_sets, of which the only internal boost usage was in graph and graph_parallel (which depends on graph). disjoint_sets has been moved into boostorg/graph on develop. The superproject has a PR to remove it as a submodule, and the boostdep tools has a PR to remove it from an exclusion list. The path to the header has been preserved, so external usage will remain unaffected for those who download boost as a package, as disjoint_sets is header-only. If you experience any issues on develop relating to the header boost/pending/disjoint_sets.hpp, make sure you have the latest boostorg/graph, and you can manually remove libs/disjoint_sets from your sandbox, that should resolve it until the other PR in the superproject comes along. Even after that is merged, I'm not sure how the defunct disjoint_sets will be handled in sandboxes and may still need to be manually removed. There is no useful content in disjoint_sets at this point. I had experienced some complaints from b2 about being unable to link the header because it was coming from the old repository when I staged this change. Thanks, Jim

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[variant] Heads-up!
by Antony Polukhin 02 May '19

02 May '19

Hi, I've merged a very cool optimization by Nikita Kniazev into the master branch. From now on boost::variant does pointer stealing for recursive variants. This significantly improves the performance of the variants move constructors. However if you use a variant variable after the std::move for anything except destruction and assignment then you're getting an UB. Beware! -- Best regards, Antony Polukhin

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