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

[John W. Eaton]

Follow-up Comment #21, bug #61812 (project octave):

The only header that uses M_PI is oct-cmplx.h.  It is used in some template
function definitions but maybe there is some way we could change that code so
M_PI would not be needed in the header file?  As far as I can tell, we only
care about std::complex<float> and std::complex<double> so it seems the header
file could just provide the necessary extern template declarations for the
specializations that we need?

Is M_PI the only defined constant we use or are there others that may also
appear in public header files?

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