How to distinguish a delegate from a function?

[Moritz Warning]

On Sun, 13 Jul 2008 03:38:36 +0200, Oliver Dathe wrote:

> This works here:
> 
> template isCallableStatically(T)
> {
> 	static if (is(T==function) || is(typeof(*T)==function))
> 		const bool isCallableStatically = true;
> 	else static if (is(T==delegate))
> 		const bool isCallableStatically = false;
> 	else static assert (false);
> }
> 
> template isCallableStatically(alias T) {
> 	const isCallableStatically = isCallableStatically!(typeof(&T));
> }
> 
> void fn() {}
> 
> void main()
> {
> 	void dg() {}
> 
> 	static assert (isCallableStatically!(fn)); static assert
> 	(!isCallableStatically!(dg)); static assert
> 	(isCallableStatically!(typeof(&fn))); static assert
> 	(!isCallableStatically!(typeof(&dg)));
> }

Doesn't work for A.bar and A.foo (where foo is static and therefore don't 
need an object)