Annex D (normative) Compatibility features [depr]

D.9 C headers [depr.c.headers]

D.9.5 Header <tgmath.h> synopsis [depr.tgmath.h.syn]

#include <cmath>
#include <complex>
1
#
The header <tgmath.h> behaves as if it simply includes the headers <cmath> ([cmath.syn]) and <complex> ([complex.syn]).
2
#
[Note
:
The overloads provided in C by type-generic macros are already provided in <complex> and <cmath> by “sufficient” additional overloads.
— end note
]
3
#
[Note
:
Names introduced by <cmath> or <complex> in namespace std are not placed into the global namespace scope by <tgmath.h>.
— end note
]