class template

Question

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() {
// some code
}
pls tell me that what is the role of first(a),second(b)?

Answer 1

This is called member initialization. When all you need to do is assign the data read in a constructor specifically to its appropriate member (one having the same type), you can, instead of writing :

MyClass(T x, T y)
{
first = x; second = y;
}

Can do this, thanks to member initialization:

MyClass(T x, T y) : first(x), second(y)
{

}

The syntax is just simple : the name of the member used as a function with the argument as the value to be assigned, and if there are multiple such assignments, seperate each with a comma.

Answer 2

temlate,class,?

Answer 3

answer is mother and cout.

Answer 4

temlate,class