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

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C compatibility
<cstdbool> (C++11/17/20*)  
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<ctgmath> (C++11/17/20*)

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

This header is part of the numeric library.

Includes

(C++11)(deprecated in C++17)(removed in C++20)
Simply includes the header <complex>
(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.