Compilation error

[Paul Brook]

On Saturday 08 September 2007, Rob Landley wrote:
> On Saturday 08 September 2007 3:32:08 am kannappan at tesbv.com wrote:
> > i have the following piece of code which gives compilation error (like
> > lvalue requried...)  may be bug with the compiler
> >
> > uchar *s;
> >
> > *((ushort *)s)++ = val;
>
> You told it to increment the value (which counts as writing to it), 

You need to go check C operator precedence rules. Your analysis is completely 
bogus.

This is the old cast-as-lvalue extension. It has never been standard C, and 
was removed in gcc 4.0. See http://gcc.gnu.org/gcc-4.0/changes.html

> > if i change that to
> >   *(ushort *)s = val;
> >   s+=2;
> >
> > it works fine.
>
> Well yes.  Now you're making it clear what order to do things in.
>
> Since when is +=2 equivalent to ++?

When += 2 is applied to a char * and ++ is applied to a short *.

Paul