STDDEF.H(7) Miscellaneous Information Manual STDDEF.H(7)

NAME

stddef.h — standard type definitions

SYNOPSIS

#include <stddef.h>

The <stddef.h> header defines the following:

NULL: 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:

ptrdiff_t: Signed integral type of the result of subtracting two pointers.
wchar_t: 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.
size_t: Unsigned integral type of the result of the sizeof operator.

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