Casting pointers

[Stephen Clamage]

harkcom at potato.pa.Yokogawa.CO.JP (Alton Harkcom) writes:

>In article <23590 at shamash.cdc.com>
>   bls at svl.cdc.com (brian scearce) writes:

> =}It shouldn't compile at all.  The mighty CDC C Version 2 prints,
> =}"Operation can only be performed on lvalues", an excellent diagnostic
>                                       ^^^^^^^
>   Shouldn't that be rvalue?

No.  If the statement is something like:
	(char*)p += i;
the complaint is not about the cast, but about the left side of the
+= operator, which must be an lvalue.  A cast does not result in an
lvalue.  Actually the left side must be a *modifiable* lvalue, and the
error message would be better if it said that.
-- 

Steve Clamage, TauMetric Corp, steve at taumet.com