Getting the size of a type tuple

[David Zhang via Digitalmars-d-learn]

Given the function F, where: F(Args...)(Args args) { ... }
How can I statically determine the size of the argument list in 
bytes?

Preferably, I would like a one-liner. However, std.algorithm 
doesn't seem to support tuples, or `Args.each!(T => 
T.sizeof).sum` would work.

For the moment, I've settled on using a helper function:

size_t size(Args...)()
{
    size_t size;
    foreach(Arg; Args)
        size += Arg.sizeof;
    return size;
}

But it's a bit clunky. Is there a more idiomatic way to do this?

Thanks