Re: Resolving template parameters

I am looking for a way to achieve the following. I've tried a couple
of things, but they all ended up being too complicated:

I have a templated class A. I want another class B to be able to call
a method defined in A's base class which at runtime determines the
template parameters (I know ahead what is allowed) and calls a
templated member function B with A's template parameters.

I'm imagining something like this - I know that it can't work like
this, but I would like to achieve a similarly simple syntax:

class Base
{
public:
 virtual void call(...) = 0;
}

template <class T1,class T2>
class A : public Base
{
 public:
   void call(...)
   {
     if (typeid(T1) == ...)
       ...
     else if (...)
       ...
     else if (...)
       ...