[C++知识库]47 C++ 重载左移运算符

作用：可以输出自定义数据类型?

#include"cf_15.h"


class PersonN
{
	friend ostream& operator <<(ostream& out, PersonN& p);
public:
	PersonN() {}
	PersonN(int a, int b);
	~PersonN() {}
	int A;

private:
	int B;
};


PersonN::PersonN(int a, int b)
{
	this->A = a;
	this->B = b;
}

//全局函数实现左移重载
//ostream对象只能有一个
ostream& operator <<(ostream& out, PersonN& p)
{
	out << p.A << "," << p.B ;
	return out;
}

void cf_15_test_01()
{
	PersonN p1(1, 2);
	cout << p1 << ",,," << endl;
}