#include <iostream>
using namespace std;

class Time{
private:
 int hh,mm,ss;
public:
 explicit Time(int h=0, int m=0, int s=0): hh(h),mm(m),ss(s) {}

 // 重载 =
 Time& operator = (const Time& t) {
 hh = t.hh;
 mm = t.mm;
 ss = t.ss;
 return *this;
 }

 // 重载 ()
 void operator()(int h,int m,int s) {
 hh = h;
 mm = m;
 ss = s;
 }

 // 重载 []
 int operator[] (int i) { 
 cout << "X::operator[" << i << "]" << endl; 
 return i; 
 };
 int operator[] (const char * cp) { 
 cout << "X::operator[" << cp << "]" << endl; 
 return 0; 
 };

 // 友元重载需要参数
 friend Time operator--(Time &t);
 friend Time operator--(Time &t, int);

 // 重载二元运算符
 Time operator+ (Time t) const {
 return Time(hh + t.hh, mm + t.mm, ss + t.ss);
 }
 Time operator- (Time t) const {
 return Time(hh - t.hh, mm - t.mm, ss - t.ss);
 }


 void ShowTime() const {
 cout << hh << ":" << mm << ":" << ss << endl;
 }
};

Time operator--(Time &t) {
 -- t.ss;
 return t;
}

Time operator--(Time &t, int) {
 t.ss --;
 return t;
}

int main() {
 Time t1(12,10,11);
 t1.ShowTime();

 cout << "reload () method1:\n";
 // 第一种写法
 t1.operator()(23,20,34);	
 t1.ShowTime();

 cout << "reload () method2:\n";
 // 第二种写法
 t1(10,10,10); 	
 t1.ShowTime();
 cout << endl;

 cout << "reload = method:\n";
 Time t2;
 t2 = t1;
 t2.ShowTime();
 cout << endl;

 cout << "reload [] method:\n";
 int a = t2[1]; 
 int b = t2["abcd"];
 cout << "a=" << a << endl;
 cout << "b=" << b << endl << endl;

 cout << "reload --t and t--:\n";
 -- t2;
 t2.ShowTime();
 t2 --;
 t2.ShowTime();
 cout << endl;

 cout << "reload + and -:\n";
 Time t3 = t1 + t2;
 t3.ShowTime();
 Time t4 = t1 - t2;
 t4.ShowTime();
 return 0;
}