Any ideas on how to be able to do something like this?
struct S(alias _fun) {
alias Fun = _fun;
}
void algorithm(alias f, T)(T s) {
static if (&f == &T.Fun) {
// trivial return
} else {
// must perform work, then return
}
}
Can you use function addresses in some way? I've seen that some
of them are resolved to __lambda0 and other times to a function
type, i.e.
Error: incompatible types for (& f) is (& __lambda1): void
function(A!(function () => 3) t) and int function() pure nothrow
@nogc @safe
That comes from doing doing this:
alias g = () => 3;
algorithm!g(S!g());
I've thought of something along the lines of a function alias
wrapper. But I'm not sure how to make that work either. Something
like:
struct Fun(alias _fun, string _id) {
alias Fun = _fun;
enum ID = _id;
}
Then maybe something like:
alias g = () => 3;
Fun!(g, "myid") gfun;
algorithm!gfun(S!gfun());
Then inside algorithm the check becomes:
static if (&f.ID == &T.Fun.ID)
But then I'd like to generate the ID at instantiation point. So
is using __LINE__, __FILE__ and applying some hash function a
good idea here?
Any other ideas?
Cheers,
- Ali
PS: If you're curious of a semi working sample, to see what I'm
actually trying to do, I've put up this gist that does not
compile right now:
https://gist.github.com/aliak00/fcdd4fa7512035405bb7015cf6d8016f
