How to get the type of a derived class in a method of its base class?

[Max Samukha via Digitalmars-d-learn]

class A {
    this(T = this)() {
        static assert(is(T == B));
    }
}
class B {
}

auto b = new B;

Here, T becomes A, which may be reasonable but is completely 
useless. Is there a way to obtain the type of the class (or class 
instance reference) the method is called on?