#include <iostream>#include <vector>#include <queue>usingnamespace std;class Timer;typedef Timer* RTimer;class Timer{public:    Timer():_interval(0),_expires_time(0){}    virtual ~Timer(){}    virtualvoid schedule_timer(int sec,int usec = 0)    {    }    virtuallong expires_time()    {        returnthis->_expires_time;    }    virtuallong interval_time()    {        returnthis->_interval;    }public:    long _interval;    long _expires_time;};struct RTimerCmp{    booloperator()(RTimer left,RTimer right)    {        if(left->_expires_time == right->_expires_time)        {            return right->_expires_time > left->_expires_time;        }        else        {            return left->_expires_time > right->_expires_time;        }    }};std::priority_queue<RTimer,std::vector<RTimer>,RTimerCmp > _rtime_queue;int main(){    Timer timer1;    timer1._expires_time = 1;    Timer timer2;    timer2._expires_time = 2;    Timer timer3;    timer3._expires_time = 3;    _rtime_queue.push(&timer1);    _rtime_queue.push(&timer3);    _rtime_queue.push(&timer2);    while(true)    {        if(_rtime_queue.size() <= 0)        {            break;        }        RTimer r = _rtime_queue.top();        cout << "expire " << r->_expires_time << endl;        _rtime_queue.pop();    }    return0;}