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.
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