Annex C (informative) Compatibility [diff]

C.6 C standard library [diff.library]

C.6.2 Modifications to definitions [diff.mods.to.definitions]

C.6.2.7 Macro NULL [diff.null]

The macro NULL, defined in any of <clocale> ([clocale.syn]), <cstddef> ([cstddef.syn]), <cstdio> ([cstdio.syn]), <cstdlib> ([cstdlib.syn]), <cstring> ([cstring.syn]), <ctime> ([ctime.syn]), or <cwchar> ([cwchar.syn]), is an implementation-defined C++ null pointer constant in this International Standard ([support.types]).