普通函数作为类模板的友元

//泛型编程(类模板)
//普通函数作为类模板的友元
#include<iostream>
using namespace std;
//类模板
template<class T1,class T2>
class A
{
	friend void Print(A<int,int>& a);
	T1 a;
	T2 b;
public:
	A() {}
	A(T1 a, T2 b);
};
template<class T1,class T2>
A<T1, T2>::A(T1 a , T2 b)
{
	this->a = a;
	this->b = b;
}
//函数:
 void Print(A<int,int>& ob)
{
	cout << ob.a << ' ' << ob.b << endl;
}
int main()
{
	A<int, int>x(10, 20);
	Print(x);
	return 0;
}