Two paramether class template

Question

#include <iostream>
using namespace std;

template <class T>
class Pair {
private:
T first, second;
public:
Pair (T a, T b):
first(a), second(b) { }
T bigger();
};

template <class T>
T Pair<T>::bigger() {
return (first>second ? first : second);
}

int main()
{
Pair <double> obj(23.43, 5.68);
cout << obj.bigger();

return 0;
}

how can i make this code with two template. one int and the other double

Answer 1

@Yusuf, since you declared only 1 template parameter you cannot instantiate the template with 2 arguments like this:

Pair <double, int> obj(23.43, 5);
cout << obj.bigger();

But you can make use of C++'s implicit casting rules - an int would implicitly cast to a double, so the following will work:

Pair <double> obj(23.43, 5);
//5 is an int
cout << obj.bigger();

Answer 2

You just create a different instance of your template with an int parameter:

int main()
{
Pair <double> obj(23.43, 5.68);
cout << obj.bigger();

Pair <int> iobj(22, 8);
cout << iobj.bigger();

return 0;

}

Answer 3

i mean that. one of two parameter will be double. and the other parameter will be integer at the same time

Obj (double,int)