Steven Schveighoffer:
> Not sure if this exists in std.traits or not, but that's where I'd look.
std.typetuple.anySatisfy helps here.
-------
spir:
> Is there any static switch?
foreach done on a typetuple is a static foreach.
> Or any other nicer way to write it than:
I suggest to put the types in a typetuple and use a foreach(i, T,
TypeTuple!(t1, t2, ...)), put your values in another typetuple and use the i
index to access and return the values.
import std.stdio, std.typetuple;
int mapper(TX)() {
alias TypeTuple!(int, float, string) Tkeys;
enum values = [100, 5, 2];
//alias TypeTuple!(100, 5, 2) Tvalues; // alternative
foreach (i, T; Tkeys)
if (is(T == TX))
return values[i];
assert(0, "Can't happen");
}
enum r = mapper!float();
static assert(r == 5);
void main() {}
Bye,
bearophile
