c++模板使用

#include<iostream>
using namespace std;
template<typename T>
struct Point
{
T x,y;
Point(T x=0,T y=0):x(x),y(y){
};
};
template<typename T>
Point<T> operator +(const Point<T> &A,const Point<T> &B)
{
return Point<T>(A.x+B.x,A.y+B.y);
}
template<typename T>
ostream& operator <<(ostream &out,const Point<T> &p)
{
out<<"("<<p.x<<","<<p.y<<")";
}
int main()
{
Point<int> a(1,2),b(3,4);
Point<double> c(1.1,2.2),d(3.3,4.4);
cout<<a+b<<" "<<c+d<<"\n";
return 0;
}