On Thursday, 9 June 2016 at 21:32:33 UTC, Alex Parrill wrote:
On Thursday, 9 June 2016 at 21:02:26 UTC, maik klein wrote:
Has this been done before?
Well, yes, the entire point of delegates is to be able to
capture variables (as opposed to function pointers, which
cannot).
auto createADelegate(int captured) {
return (int a) => captured + a;
}
void main() {
auto dg1 = createADelegate(5);
auto dg2 = createADelegate(32);
assert(dg1(5) == 10);
assert(dg1(10) == 15);
assert(dg2(8) == 40);
assert(dg2(32) == 64);
}
https://dpaste.dzfl.pl/90ebc29651f6
(Unfortunately template delegates, like the ones used with map,
don't keep their captured variables alive after the captured
variables go out of scope, but it doesn't sound like you need
those)
I meant, "has this been implement as a library before". I am well
aware that delegates exist in the language but as far as I know
you can not do manual allocation with delegates (to avoid the GC).
