对象指针与this指针

#include<iostream>
using namespace std;

class Time
{
        public :
                Time(int,int,int);
                void get_time();
        private:
                int hour;
                int minute;
                int sec;:
};

Time::Time(int h,int m ,int s)
{
        hour = h;
        minute = m;
        sec = s;
}

void Time::get_time()
{
        cout<<hour<<":"<<minute<<":"<<sec>>endl;
}

int main()
{
        Time t1(10,13,56);
        int *p1 = &t1.hour;
        cout<<*p1<<endl;
        t1.get_time();

        Time *p2 = &t1;
        p2->get_time();

        void(Time::*p3)();
        p3 = &Time::get_time;
        (t1.*p3)();
}
~      

int Box∷volume( )
{　　
　　return (height*width*length);
}
C++把它处理为
int Box volume(Box *this)
{
　　return(this->height * this->width * this->length);
}