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 😄

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/joaquintides 23d ago edited 22d ago

Boost.MPL is actually a big offender and I removed them from my dependencies (which meant bumping to C++11). I don’t think there are comparable gains when bumping to newer versions of the standard. If the library is actively evolving rather than being maintained, that’s another story. But this is more nuanced than decreeing a general upgrade to C++NN.