#include <iostream>
#include <string>

template <typename S, typename T> class A{               // Template class
  //  ...
};

template<> class A <int, std::string> {                  // Complete specialization to S = int, T = string
  //  
};

template<typename S, typename T> class A <S*, T*> {      // Partial Specialization to pointers
  //
};

template<typename T> class A <T, T> {                    // Partial specialization: T and S are the same types
  //
};



int main(){
  A<double,bool> a1;                                     // Use of A<S,T>
  A<int,std::string> a2;                                 // Use of A<int,string>
  A<double*,std::string*> a3;                            // Use of A<T*,S*>
  A<double,double> a4;                                   // Use of A<T,T>
}