One interface calls several different functions

Server side provides me with an SDK, there are more than 30 different function names different parameters of different parameters of the interface, I need to choose a different interface according to the message type, but also need to separate this option as a module to provide a unified interface upper call.

Module A module b

-----IType-------------->

<---Returns a unified interface FP-----

Fp->dooperator ();

Because the project is VS2005,
So.
Can't use function
Not even with
Template <typename T, TypeName ... Args>
void foo (const T &t, const args&...rest);

Think of two scenarios:
1, using a variable parameter pointer implementation:

2, based on the parameters to do a base class implementation:

One interface calls several different functions