On Fri, Jul 24, 2009 at 8:27 PM, asd<[email protected]> wrote:
> I've got D2 code:
>
>> template ObjcMethodSelectorCheck(string sel, A...) {
>> const n = countMethodArguments(sel);
>
> and:
>
> pure static uint countMethodArguments(string name) {
> if (name.length == 0) return 0;
> if (name[0] == ':') return 1+countMethodArguments(name[1..$]);
> return countMethodArguments(name[1..$]);
> }
>
> Original version of this method was pure too, but used count++. Fine, maybe
> compiler wasn't smart enough to understand that, but now I've rewritten it in
> purely functional style, and it's still not "constant" enough!
>
> objc/method.d(54): Error: cannot evaluate
> countMethodArguments(ToSetterSelector) at compile time
> objc/method.d(57): Error: expression 1u !=
> countMethodArguments(ToSetterSelector) is not constant or does not evaluate
> to a bool
I think something else is going on. I can't reproduce any problems:
pure static uint countMethodArguments(string name)
{
if(name.length == 0)
return 0;
if(name[0] == ':')
return 1 + countMethodArguments(name[1 .. $]);
return countMethodArguments(name[1 .. $]);
}
template Temp(string sel)
{
const Temp = countMethodArguments(sel);
}
void main()
{
writeln(Temp!("foo:bar:")); // prints 2
}
Can you post more of your code?
