Standard library header <ctgmath> (C++11) (until C++20), <tgmath.h> (C++11)

This header was originally in the C standard library as <tgmath.h>.

This header is part of the numeric library.

Includes
<ccomplex> (C++11) (deprecated in C++17) (removed in C++20)	Simply includes the header <complex>
<cmath> (C++11)	Common mathematics functions

Notes

<ctgmath> is deprecated in C++17 and removed in C++20. Corresponding <tgmath.h> is still available in C++20.