bearophile wrote:
In my dlibs there's a lazyOr() that takes any number of arguments and returns
the first one that's true (where true is defined by a standard function
boolean() that returns false for 0, null, objects/structs that have a length
and where such length is zero).
A reduced (and untested) version that works with two arguments only, that is (I
think) the Elvis operator:
Tx lazyOr(Tx, Ty)(Tx x, lazy Ty y) {
static assert(CastableTypes!(Tuple!(Tx, Ty)), "lazyOr: all items must be
castable to the same type.");
if (boolean(x))
return x;
return y();
}
I guess this would work better:
CommonType!(Tx, Ty) lazyOr(Tx, Ty)(Tx x, lazy Ty y) { ... }
Andrei
