The given snippet is a C++ code that defines a class template called "Harry." This class template has three template parameters: T1, T2, and T3, each of which has a default data type if not specified. T1 defaults to int, T2 defaults to float, and T3 defaults to char.

The class template contains three data members: a, b, and c of types T1, T2, and T3, respectively. The class also has a constructor that initializes these data members with the values passed as arguments.

Additionally, the class has a member function called "display" that prints the values of a, b, and c.

Here's a breakdown of the class template:

template <class T1=int, class T2=float, class T3=char>
class Harry{
    public:
        T1 a;
        T2 b;
        T3 c;
        Harry(T1 x, T2 y, T3 z) {
            a = x;
            b = y;
            c = z;
        }
        void display(){
            cout<<"The value of a is "<<a<<endl;
            cout<<"The value of b is "<<b<<endl;
            cout<<"The value of c is "<<c<<endl;
        }
};

This class template can be used to create objects with different data types for its members through template arguments. For example, Harry<int, float, char> will create an object where a is an integer, b is a float, and c is a character.