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#include <iostream>
#include <string>

// Primary class template
template<typename T>
class TypeInfo {
public:
    static std::string name()    { return "unknown";  }
    static bool isPointer()      { return false;      }
};

// Full specialisation for int
template<>
class TypeInfo<int> {
public:
    static std::string name()    { return "int";      }
    static bool isPointer()      { return false;      }
};

// Full specialisation for double
template<>
class TypeInfo<double> {
public:
    static std::string name()    { return "double";   }
    static bool isPointer()      { return false;      }
};

// Partial specialisation for any pointer type
template<typename T>
class TypeInfo<T*> {
public:
    static std::string name()    { return TypeInfo<T>::name() + "*"; }
    static bool isPointer()      { return true;       }
};

// Generic Pair class template
template<typename First, typename Second>
class Pair {
public:
    Pair(First f, Second s) : first(f), second(s) {}
    First  first;
    Second second;
    void print() const {
        std::cout << "(" << first << ", " << second << ")
";
    }
};

int main() {
    std::cout << TypeInfo<int>::name()     << "
";  // int
    std::cout << TypeInfo<double>::name()  << "
";  // double
    std::cout << TypeInfo<int*>::name()    << "
";  // int*
    std::cout << TypeInfo<float>::name()   << "
";  // unknown
    std::cout << std::boolalpha
              << TypeInfo<int*>::isPointer() << "
"; // true

Pair<std::string, int> p("age", 30);
    p.print();

return 0;
}