#include<iostream> using namespace std; class Date; class Time{ public: Time(int, int, int); void display(const Date&); private: int hour,minute,second; }; class Date{ public: Date(int, int, int); friend void Time::display(const Date&); private: int year,month,day; }; Time::Time(int h,int m,int s):hour(h),minute(m),second(s){} Date::Date(int y,int m,int d):year(y),month(m),day(d){} void Time::display(const Date& date){ cout<<date.year<<"-"<<date.month<<"-"<<date.day<<" " <<hour<<":"<<minute<<":"<<second<<endl; } int main(){ Time t1(11,29,25); Date d1(2020,3,12); t1.display(d1); void (Time::*p1)(const Date&); p1=&Time::display; (t1.*p1)(d1); return 0; }
#include <iostream> using namespace std; class Point { public: Point(int x = 0, int y = 0) : x(x), y(y) { } int getX() const { return x; } int getY() const { return y; } private: int x, y; }; int main() { Point a(4,5); Point *p1 = &a; int (Point::*funcPtr)() const = &Point::getX; cout << (a.*funcPtr)() << endl; cout << (p1->*funcPtr)() << endl; return 0; }
原文链接: https://www.cnblogs.com/lyt888/p/12493088.html
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