#include <iostream>
using namespace std;
/*模板類 各種函式在類外的實現*/

template <typename T>
class AA
{
public:
    AA(T a, T b);
    void printAA();
    AA operator+(AA &tmp);
    //友元函式過載<<
    friend ostream& operator<< <T>(ostream& out, AA<T>& tmp);
private:
    T a;
    T b;
};

template
 
 <typename T>
AA<T>::AA(T a, T b)
{
    this->a = a;
    this->b = b;
}

template <typename T>
void AA<T>::printAA()
{
    cout << "a:" << a << " b:" << b << endl;
}
//類外實現函式時，加T的地方有 函式返回值，類名:: ，形參變數
template <typename T>
AA<T> AA<T>::operator
 
+(AA<T> &tmp)
{
    AA tt(this->a + tmp.a, this->b + tmp.b);
    return tt;
}

//友元函式過載<<
template <typename T>
ostream& operator<< (ostream& out, AA<T>& tmp)
{
    out << "a=" << tmp.a << " b=" << tmp.b << endl;
    return
 
 out;
}
int main()
{
    AA<int> tmp(5, 6);
    AA<int> tmp1(5, 7);
    AA<int> tmp2 = tmp1 + tmp;
    tmp2.printAA();
    cout << tmp2 << endl;
    return 0;
}