Path: utzoo!mnetor!uunet!husc6!mit-eddie!uw-beaver!ssc-vax!cxsea!blm
From: blm@cxsea.UUCP (Brian Matthews)
Newsgroups: comp.lang.c
Subject: Re: New Features:  ++(expr)
Message-ID: <2354@cxsea.UUCP>
Date: 11 Feb 88 16:15:40 GMT
References: <386@osupyr.UUCP>
Reply-To: blm@cxsea.UUCP (Brian Matthews)
Organization: Computer X Inc.
Lines: 18

Don Comeau (ddc@osupyr.UUCP) writes:
|Since everyone else is suggesting their addtion to C, here is one I
|think would be useful.  Why are ++ and -- still limited to lvalues?  I
|think ++expresion should be an expression which has the value
|expression+1.
|Are there any good reason why this hasn't been done?

Yes.  ++ and -- have the side effect of incrementing or decrementing the
lvalue they're applied to, so they have to be applied to lvalues.  How
does one increment x + y (as in ++(x+y)) or m + 4 (as in ++(m+4))?  If
you want the value of one more than an expression and don't want the
increment side effect, that's easy to do in C also:  expression + 1

-- 
Brian L. Matthews                               "A power tool is not a toy.
...{mnetor,uw-beaver!ssc-vax}!cxsea!blm          Unix is a power tool."
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