On 07/07/13 14:27, Peter Alexander wrote:
> template allSatisfy(alias F, T...)
> {
> static if (T.length == 0)
> {
> enum allSatisfy = true;
> }
> else static if (T.length == 1)
> {
> enum allSatisfy = F!(T[0]);
> }
> else
> {
> enum allSatisfy =
> allSatisfy!(F, T[ 0 .. $/2]) &&
> allSatisfy!(F, T[$/2 .. $ ]);
> }
> }
>
> Still looks like half-assed functional programming to me.
>
> Where's the iteration? Why can't I write this?
>
> template allSatisfy(alias F, T...) {
> foreach(t; T)
> if (!F!(t))
> return false;
> return true;
> }
>
> (Those are rhetorical questions btw, before anyone links me to a D tutorial).
template allSatisfy(alias F, T...) {
enum allSatisfy = {
foreach (E; T)
if (!F!E)
return false;
return true;
}();
}
// And no, it isn't perfect. But not /that/ much is missing.
// It's the more complex cases that would benefit from more meta features.
artur
