Example of specialized template class in C++

template_class_spec.cpp

#include <iostream>
using namespace std;

template <class T>
class Two_values {
    T a;
    T b;
    public:
        Two_values (T first_arg, T second_arg) {
            a = first_arg;
            b = second_arg;
        }
        void custom_add () {
           cout << "General result = " << (a + b) << endl;
        }
};

template <>                   // Note: no 'T' here
class Two_values <char> {     // <char> specifier instead
    char a;
    char b;
    public:
        Two_values (char first_arg, char second_arg) {
            a = first_arg;
            b = second_arg;
        }
        void custom_add () {
            cout << "Char result = " << a << b << endl;
        }
};

int main () {
    Two_values <int>  Two_int_values (1, 2);
    Two_values <char> Two_char_values ('a', 'b');

    Two_int_values.custom_add();
    Two_char_values.custom_add();

    return 0;
}