friend ostream &operator << (ostream &output, point<Type> &p);哪里错了

#include <cstdio>
#include <iostream>
#include <cstring>
#include <algorithm>

using namespace std;

#ifndef POINT_H
#define POINT_H

template < class Type>
class point
{
public:
//point() {}
point(Type a, Type b) : x(a), y(b) {};
point(point &a)
{
x = a.x;
y = a.y;
}
~point() {};
Type getx() { return x; }
Type gety() { return y; }
point<Type> operator + (point<Type> &a);
point<Type> operator - (point<Type> &a);
Type operator * (point<Type> &a);
Type cross(point<Type> &a);
int operator == (point<Type> &a);
friend ostream &operator << (ostream &output, point<Type> &p);
private:
Type x, y;
};

#endif

template <class Type> int point<Type>::operator == (point<Type> &a)
{
return (x =

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