stddef.h - standard type definitions
The <stddef.h> header defines the following:
- Null pointer constant.
- offsetof(type, member-designator)
Integral constant expression of type size_t, the value of which is the offset in bytes to the structure member (member-designator), from the beginning of its structure (type).
The <stddef.h> header defines through typedef:
Signed integral type of the result of subtracting two pointers.
Integral type whose range of values can represent distinct wide-character codes for all members of the largest character set specified among the locales supported by the compilation environment: the null character has the code value 0 and each member of the Portable Character Set has a code value equal to its value when used as the lone character in an integer character constant.
Unsigned integral type of the result of the sizeof operator.