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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: NULL
Date: Thu, 10 Jan 2013 00:42:01 +0100
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* Rich Felker <dalias@aerifal.cx> [2013-01-09 10:36:30 -0500]:
> question: short of C11 _Generic, is it even possible for a program to
> detect whether NULL has integer or pointer type?

if it's ok to detect at compile time then it's easy:

int a = -NULL;
int b = NULL+NULL;
int c = NULL+.0f;
int d[NULL+1];
int e = 0?NULL:1;

these are compile time errors if NULL has pointer type
but ok when NULL is integer