Path: utzoo!utgpu!cunews!micor!latour!revcan!darren
From: darren@revcan.UUCP (Darren Morbey)
Newsgroups: comp.lang.c
Subject: Re: When do you use "if ( a = b )"? (was Re: Funny mistake)
Message-ID: <150@revcan.UUCP>
Date: 25 Mar 91 14:58:10 GMT
References: <1991Mar18.195351.11985@unlv.edu> <357@ptcburp.ptcbu.oz.au> <3130@inews.intel.com>
Organization: Revenue Canada, Taxation; Office Communications Division
Lines: 23

In article <3130@inews.intel.com>,
           bhoughto@hopi.intel.com (Blair P. Houghton) writes:
>In article <1991Mar19.192416.13756@unlv.edu>
             grover@lowell.cs.unlv.edu (Kevin Grover) writes:
>>michi@ptcburp.ptcbu.oz.au (Michael Henning) writes:
>>>grover@sonny-boy.cs.unlv.edu (Kevin Grover) writes:
>>>>	#define EQU ==
>>>>	if ( a EQU b)
>>>NO, NO, NO ! Please don't do this.
>#define should _never_ be used to replace existing tokens.
Just as a suggestion, what about:
     #define EQU(l,r) ((l)==(r)) /*...*/ if( EQU(a,b) )
I realize this is rather messy, because it
"contribute[s] nothing to the readability of the code." (Mr. Henning)
It does make the equality different from the assignment without violating
"#define should _never_ be used to replace existing tokens." (Mr. Houghton)

Pardon me for asking, but please define "obfuscation."

P.S.  I would find it useful to #define NOT(a) !(a),
      #define COMPL(a) ~(a), and #define XOR(a,b) ((a)^(b)).
      I have trouble remembering the use of the tilde and
      circumflex.  Again, only a suggestion.