[Octave-bug-tracker] [bug #61812] Math constants (e.g. M_PI) are not part of C/C++ standard

[John W. Eaton]

Follow-up Comment #28, bug #61812 (project octave):

Instead of using C constants and a gnulib module (which is mostly about C, not
C++ anyway) could we check for the existence of <numbers> and provide
definitions for what we need if it is missing?  Then I think we should be able
to use


std::numbers::pi


and so on where we need them.  Our replacement for <numbers> might not be 100%
compatible with what C++20 provides but I don't see that we need that.  All we
really need is a way to access these constants in a reasonably efficient way
and using the future C++ names seems better to me than using macros like M_PI.

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