c++代码实现模板类的友元重载
#include <iostream>
using namespace std;
template <
class T>
class Test;
template <
class T>
ostream&
operator<<(ostream& out,
const Test<T> &obj);
template <
class T>
class Test
{
private:
int num;
public:
Test(
int n =
0){
num = n;
}
Test(
const Test<T> ©)
{
num = copy.num;
}
friend ostream&
operator<< <T> (ostream& out,
const Test<T> &obj);
};
template <
class T>
ostream &
operator<< (ostream &out,
const Test<T> &obj)
{
out << obj.num;
return out;
}
int main()
{
Test<
int> t(
2);
cout << t;
return 0;
}
