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From: sue@hpclsue.HP.COM (Sue Meloy)
Newsgroups: comp.lang.c
Subject: Re: ! operator in constant expressions
Message-ID: <660003@hpclsue.HP.COM>
Date: 13 Jan 88 01:13:48 GMT
References: <3813@hoptoad.uucp>
Organization: HP ITG/ISO Computer Language Lab
Lines: 21



According to the latest ANSI draft:

A constant expression used in a static initializer must evaluate to one of the
following:

    an arithmetic constant expression
        only arithmetic operands; casts can only be from arithmetic type to
        arithmetic type.
    an address constant
	created via & or by use of an array or function name
    an address constant plus or minus an integral constant expression

Thus, the following examples are not legal ANSI C:

int pno = ! &bar;
int pyes = !(char *)0; 

	Sue Meloy
	sue@hpda.HP.COM