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On Mar 3, 1999, Gabriel Dos Reis <Gabriel.Dos-Reis@dptmaths.ens-cachan.fr> wrote:
> NULL is *not* a pointer. NULL is _convertible_ to pointer type. More
> explicitly, the C++ Standard says:
> 4.10/1
> ---
> A null pointer constant is na integral expression (5.19) rvalue of
> integer type that evaluates to zero.
> ---
> So NULL is of integer type. Exactly wich one is implementation-defined.
Actually, it needs not be an integer type; the definition
enum __NULL_type { __null = 0 };
#define NULL __null
is a valid one, because integral expressions may involve enumerators.
--
Alexandre Oliva http://www.dcc.unicamp.br/~oliva aoliva@{acm.org,computer.org}
oliva@{dcc.unicamp.br,gnu.org,egcs.cygnus.com,samba.org}
Instituto de Computação, Universidade Estadual de Campinas, SP, Brasil