Re: Drawing a point in a pixbuf.

["Richard Warren" <richard warren curtisswright com>]

Jose Hevia wrote to Magnus Myrefors:
> >          ->  *p++ = 0xff;
>
> Please don't do that, different compilers will interpret this differently.
> I understand this means:
>
> +increment *p (the content of the variable p points to)
> +store 0xff in *p
>
> OR
>
> +increment p
> +store 0xff in *p

None of the above is correct.

"*p++ = 0xff;" means:
       store 0xff in the location pointed to by p,
       THEN increment p.

This is standard C precedence of operator stuff.  The '++' binds more 
tightly to 'p' than the unary '*' does, so it applies to the pointer itself, 
not the value stored in that location.  However, because '++' is a suffix 
the value of 'p++' is p, not p+1, so the 0xff value is stored at p, not p+1.

All C compilers should interpret that line of code in the same manner.

But you're right with the general principle that if you find it confusing, 
you should rewrite it in a clearer manner.

Richard.