Unpack Variadic Args?

[Jeff via Digitalmars-d-learn]

Hello,

Was wondering if there was a simple, efficient way to unpack a 
variadic template argument. It needs to be efficient at runtime, 
and hopefully not use too much excessive CTFE.

C++ has the "..." operator, is there something equivalent in D?

    template<class ...Args>
    void g(Args... args) {
        f(foo(args)...); // f(foo(args[0]), foo(args[1])); // etc
    }

What would be a good way to write that in D, with it being as 
efficient (no copies or building structs etc) and not use too 
much CTFE. Needing to use `.map` or similar at CTFE would be an 
example of too much CTFE.

    void g(Args...)(auto ref Args args) {
         // ?
    }