getting all children classes in program

[Ondra via Digitalmars-d-learn]

Hi,

how can I get list of all children classes of class in program? I 
was trying to use ModuleInfo from D Coockbook but this does not 
work for template classes?

ex.:
class A{}
class B:A{} // ok in ModuleInfo
class C(T): B {} // missing in ModuleInfo

I am trying to assign every class its unique ID that is same for 
all instances.

Code:
int result[string];

        int counter = 0;
        foreach(mod; ModuleInfo)
        {
                foreach(cla; mod.localClasses)
                {
                        auto base = cla.base;
                        while (base)
                        {
                                if (base is T.classinfo)
                                {
                                        result[cla.name] = counter;
                                        
                                        counter++;
                                }

                                base = base.base;
                        }
                }
        }