两个类
class A
{
public:
...
int Getx(){return X;}
friend class B;
private:
...
};
class B
{
public:
...
private:
A a;
}; 当创建一个B类的对象时,A类也会创建一个对象吗?但怎么用该对象调用类A中的函数.如创建了B类对象b,怎么通过A的对象a来调用Getx()

class A
{
public:
...
int Getx(){return X;}
friend class B;
private:
...
};
class B
{
public:
int get(A a){return a.Getx();}
//or int get(){return a.Getx();}
private:
A a;//在用友员时不用定义
};