Reference C Library IOstream Library Strings library STL Containers STL Algorithms Miscellaneous C Library cassert (assert.h) cctype (ctype.h) cerrno (errno.h) cfloat (float.h) ciso646 (iso646.h) climits (limits.h) clocale (locale.h) cmath (math.h) csetjmp (setjmp.h) csignal (signal.h) cstdarg (stdarg.h) cstddef (stddef.h) cstdio (stdio.h) cstdlib (stdlib.h) cstring (string.h) ctime (time.h) cstddef (stddef.h) macros: NULL offsetof types: ptrdiff_t size_t

NULL macro <cstddef> Null pointer This macro expands to a null pointer constant. A null pointer is generally used to signify that a pointer does not point to any object. In C++, NULL expands either to 0 or 0L.

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