template用法

#include <iostream>

template <typename T, typename H>
class A {
    public:
        A() {}
        ~A() {}

    public:
        void setA(T a) {
            _a = a; 
        }
        T getA() {
            return _a;
        }

        void setB(H b) {
            _b = b;
        }

        H getB() {
            return _b;
        }

    private:
        T _a;
        H _b;
};

class B {
    public:
        B() {}
        ~B() {}

    public:
        template <typename T>
        void setA(T a) {
            _a = (int)a; 
        }

        template <typename T>
        T getA() {
            return _a;
        }

        template <typename H>
        void setB(H b) {
            _b = (double)b;
        }

        template <typename H>
        H getB() {
            return _b;
        }

    private:
        int _a;
        double _b;
};


int main() {
    A<int, double> a;
    a.setA(10);
    a.setB(1.23);

    std::cout << "a:" << a.template a.getA() << ",b:" << a.getB() << std::endl;

    B b;
    b.setA<int>(20);
    b.setB<double>(2.34);
    std::cout << "b:" << b.getA<int>() << ",b:" << b.getB<double>() << std::endl;

    return 0;
}