Timer class with queued callbacks

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ses boost::function, but feel free to edit TimedCallback, and use function pointers or whatever... Example usage:// the callbackvoid foo(void) { cout << "bar" << endl; }// delay::Timer::getInstance()->delay(&foo, 1000);// somewhere, in your main-loop if using renderOneFrame(), or a framelistener's frameStarted()......::Timer::getInstance()->processQueue(); Timer.h#ifndef TIMER_H#define TIMER_H#include #include #include #include #include typedef std::pair< unsigned long, boost::function > TimedCallback;class PrioritizeCallbacks{public:bool operator() ( const TimedCallback& lhs, const TimedCallback& rhs ) const{return rhs.first < lhs.first;}};typedef std::priority_queue< TimedCallback, std::vector, PrioritizeCallbacks > TimedCallbackQueue;class Timer{public:static Timer* getInstance();static void Release();/** * /return Milliseconds since timer started */unsigned long getTime() { return mTimer->getMilliseconds(); }/** * /return Microseconds since timer started */unsigned long getMicroTime() { return mTimer->getMicroseconds(); }/** * /brief Delayed execution of a callback * /param cb */inline void delay(TimedCallback cb) { mQueue.push(cb); }/** * /brief Delayed execution of a callback * /param func the callback to execute * /param time to delay execution of callback */void delay(boost::function func, unsigned long time);/** * /brief Process the callback queue, executes pending functions * /note Have to call this manually, at shortest possible intervals, * If using Ogre::Root::startRendering() for example, this would be on every * onFrameStarted(). */void processQueue();/** * /brief Clears the queue */void clearQueue();private:Timer();virtual ~Timer();protected:Ogre::Timer* mTimer;TimedCallbackQueue mQueue;static Timer* ms_instance;};#endif // TIMER_H Timer.cpp#include "Timer.h"Timer* Timer::ms_instance = 0;Timer::Timer(){mTimer = new Ogre::Timer();}Timer::~Timer(){delete mTimer;}Timer* Timer::getInstance(){if(ms_instance == 0){ms_instance = new Timer();}return ms_instance;}void Timer::Release(){if(ms_instance){delete ms_instance;}ms_instance = 0;}void Timer::delay(boost::function func, unsigned long time){TimedCallback cb(getTime() + time, func);delay(cb);}void Timer::processQueue(){while(!mQueue.empty()){const TimedCallback &cb = mQueue.top();long delta = cb.first - getTime();if(delta>0) return;cb.second();mQueue.pop();}}void Timer::clearQueue(){mQueue = TimedCallbackQueue();}转自 http://www.ogre3d.org/tikiwiki/Timer+class+with+queued+callbacks&structure=Cookbook