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左移运算符重载


左移运算符重载

  • 作用:可以输出自定义类型

代码示例:
#include <iostream>
using namespace std;
//左移运算符重载
class Person
{
friend ostream & operator<<(ostream &cout, Person &p);
public:
Person(int a, int b)
{
m_A = a;
m_B = b;
}
private:

//利用成员函数重载左运算符 p.operator<<(cout) 简化版本p<<cout
//void operator<<(cout)
//{
//
//}
int m_A;
int m_B;
};
//只能利用全局函数重载左移运算符
ostream & operator<<(ostream &cout, Person &p) //本质 operator<<(cout,p) 简化 cout<<p
{
cout << "m_A=" << p.m_A << " m_B=" << p.m_B;
return cout;
}
void test01()
{
Person p(10,10);
//p.m_A = 10;
//p.m_B = 10;
cout << p<<"hello world"<<endl;
}
int main()
{
test01();
return 0;
}

总结:重载左移运算符配合友元可以实现输出自定义数据类型

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左移运算符重载_c++


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