Re: Is it possible to check if a type is an instance of a template?

[Simen Kjaeraas]

On Thu, 15 Sep 2011 22:24:50 +0200, Andrej Mitrovic  
<andrej.mitrov...@gmail.com> wrote:

I can do this:
struct Foo(T) { }
template bar(T : Foo!int) { }

I can check if T is a specific instantiation of Foo. But I want to
check whether T is *any* instantiation of Foo. Is this possible to do?

Otherwise I'm currently having to hardcode via:

template bar(T) if (isOneOf!(T, Foo!int, Foo!double)) { }

But having to list all possible instantiations doesn't really scale too  
well.

static if can do this:

template IsAFoo(T) {
    static if (is(T t == Foo!U, U)) {
        enum IsAFoo = true;
    } else {
        enum IsAFoo = false;
    }
}

--
  Simen