#include <iostream>
using namespace std;
 
template<class T1, class T2>
class AClass  { public: void test(){cout<<"AT1T2"<<endl;}};
 
template<class T>
class AClass<T, T> { public: void test(){cout<<"ATT"<<endl;}}; // specialized class.
 
AClass<int,float> aClassIntFloat; // works just fine
 
AClass<int, int> aClassIntInt; // works just fine
 
template<class T2>
class AClass<double, T2>  { public: void test(){cout<<"ADT2"<<endl;}};
 
AClass<double, int> aClassDoubleInt; 
 
//AClass<int> specializedIntClass; //"error: wrong number of template arguments (1, should be 2)"
 
 
int main() {
	aClassIntFloat.test(); 
	aClassIntInt.test();
	aClassDoubleInt.test(); 
	return 0;
}

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