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

[Rik]

Follow-up Comment #29, bug #61812 (project octave):

@jwe: No problem adopting a more C++ way of doing things.  It seems to me that
any fix is starting to grow to a mildly large patch at this point.

First there needs to be configure.ac tests for the constants we are using. 
Some compilers will not be C++20 compatible so std::numbers won't exist.  That
means we should provide our own replacements.  Maybe the best solution is an
octave::numbers class which maps on to std::numbers when it exists or a
replacement value if it does not?

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