| cstddef (stddef.h) | header |
C Standard definitions
cstddef defines the following types:
| 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.