[C++] operator 함수

 
 
#include<iostream>
using namespace std;
 
 
class A
{
int a;
public:
A(int a = 100000){ this->a = a; }
void setA(int a){ this->a =a ;}
int getA()const{ return a; }
 
 
friend ostream& operator<<(ostream &cout,const A &aa);
};
ostream& operator<<(ostream &cout,const A &aa)
{
cout<<aa.a;
 
 
return cout;
}
void main()
{
A aa;
A bb(90);
cout<<aa.getA()<<endl;
cout<<aa<<bb; // opertor<<(cout,aa);
}