stddef(5)                                                         stddef(5)

NAME
     stddef - standard type definitions

SYNOPSIS
     #include <stddef.h>

DESCRIPTION
     The <stddef.h> header defines the following:

     NULL            Null pointer constant.

     offsetof(type, member-designator)
                     Integral constant expression of type sizet, 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:

     ptrdifft       Signed integral type of the result of subtracting two
                     pointers.

     wchart         Integral type whose range of values can represent dis-
                     tinct wide character codes for all members of the
                     largest character set specified among the locales sup-
                     ported by the compilation environment: the null char-
                     acter 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.

     sizet          Unsigned integral type of the result of the sizeof
                     operator.

SEE ALSO
     types(5), wchar(5).



















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