rtti cast

[Simon Buerger]

hi
I would like to do some RTTI, but not with type-IDs, but in some more 
pretty way. I'll simply post some code to show you what I mean :) . My 
Question is now: Does anyone know, how to do sth alike with the 
current D implementation (maybe with templates, but I dont see a nice 
way) ? Or do you think it could be worth an extension for D 2.0 ?
Krox

Code:

class Base {}
class A : Base
{
	void function_A() { ... }
}
class B : Base {}
{
	void function_B() { ... }
}

void main()
{
	Base x = ...
	
	// checks if x is of type A, and if so, declares y as A alias of x 
with other type
	if (x == A y)	
		y.function_A();
	else if(x == B y)
		y.function_B();
}