c++学习札记 友元成员

// 使用友元成员函数访问另一个类

#include <iostream.h>
#include <string.h>
class girl;            //向前引用
class boy{
char *name;
int age;
public:
boy(char *N,int A)
{    name=new char[strlen(N)+1];
strcpy(name,N);
age=A;
}
void disp(girl &);    //声明disp()为类boy的成员函数
~boy(){delete name;}
};

class girl{
char *name;
int age;
public:
girl(char *N,int A)
{    name=new char[strlen(N)+1];
strcpy(name,N);
age=A;
}
friend void boy::disp(girl &);    //声明类boy的成员函数disp()为类girl的友元函数

~girl(){delete name;}
};

void boy::disp(girl &x)
{
cout<<"boy\'s name is:"<<name<<",age:"<<age<<endl; //访问本类对象成员

cout<<"girl\'s name is:"<<x.name<<",age:"<<x.age<<endl; //访问友元类对象成员

}
void main()
{    boy b("chen hao",25);
girl g("zhang wei",18);
b.disp(g);
}

friend void boy::disp(girl &); //声明类boy的成员函数disp()为类girl的友元函数