如何在C++中定义特定于类的<<运算符

Question

鉴于如下课程:

class Person
{
private:
    char *name;

public:
    Person()
    {
        name = new char[20];
    }
    ~Person()
    {
        delete [] name;
    }
}

我想打印以从这个实例打印名称,使用如下语句:

cout << myPerson << endl;

如何<<为此类定义输出运算符？

Answer 1

在课堂上添加:

friend std::ostream& operator<< (std::ostream& out, const Person& P);

然后定义运算符<<这样的东西:

std::ostream& operator<< (std::ostream& out, const Person& P) {
    out << P.name;
    return out;
}