|ptrdiff_t||Result of pointer subtraction (type)|
|size_t||Unsigned integral type (type)|
The following macro with functional form:
|offsetof||Return member offset (macro)|
And the following macro with a constant value:
|NULL||Null pointer (macro)|
In the C language, this header also includes the declaration of the wchar_t type (wide character type), which in C++ is a fundamental type and therefore does not require the inclusion of any header.