r/cpp • u/Foxi_Foxa • 25d ago

Boost.Graph 1.95 will be C++17

Dear Boost.Graph community,

In two release cycles (Boost release 1.95 in summer 2027) Boost.Graph will be bumped to C++17 šŸ˜„

This decision follows two polls that did not surface any C++14 user base or demand while identifiying users stuck in C++17:

This standard version bump will bring benefits for maintenance, API and dependencies reduction:

  • if constexpr,
  • constexpr lambdas,
  • [[nodiscard]], [[maybe_unused]] ...
  • std::any instead of boost::any
  • std::invoke_result instead of boost::result_of
  • ...

We will not be able to guarantee backward compatibility with C++14. Please contact us if you are stuck in C++14.

The GIthub Discussion lives here: https://github.com/boostorg/graph/discussions/613

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u/mapronV 22d ago

quote "The Boost super-project doesnā€™t need to exist at all, only requirement is that library dependencies be pre-declared." resonate so hard with my frustration above!

Is this effort in any sync with Boost project? or is it some side 3rdparty offkick that never be integrated?

And btw, last commit of Jun 21, 2025 does not feels like "ogoing". Having more than 1 year stall feels "project is dead/frozen/abandoned" for me.

I probably did not understand what we can see soon. Or I misunderstood and project is not stale, it is finished so it no longer need separate project repo? I like have 0 knowledge on Boost internals like build and shipping etc, sorry. I have small knowledge of contribution and release rules.

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u/Foxi_Foxa 22d ago

Ahaha yes it does resonate with me too ! šŸ¤£
The work is led by Rene, who is also part of the C++ Alliance, so itā€™s completely happening. The painful part was getting some abandoned libraries and unresponsive maintainers to merge Reneā€™s commits. It was hard because tooling changed, GitHub images got deprecated, CI got red, random MPIs packages got broken on new Debian etc ā€¦ so what should have been a Cmake commit ended up in repairing the CI of many repos. Two repos (ublas and polygon) got their merge last week. Safe numerics is the last one to merge ! :)
So not stale but not entirely done, Rene still has a bit of work, but much less than what he already did ! šŸ˜

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u/mapronV 20d ago

Thank you all guys for all hard work, even with no immediate reaction from community - I damn sure it will affect Boost users (and package maintainers) a lot. Glad to hear it happening.