Timers.h

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#pragma once

#include <memory>
#include <list>
#include "Types.h"

class Timers;

class TimerEvent
{
private:
    DWORD dwExpiryTime, dwDelay;
    void SetExpiry(DWORD dwDelay);

protected:
    TimerEvent(DWORD dwDelay);

public:
    virtual ~TimerEvent();

    // Get a timer's id
    DWORD GetID() const;

    // used to check if the timer is ready
    bool ready(DWORD dwCurTicks) const;

    // Reset the timer
    void Reset();

    // return true to reset the timer
    virtual bool OnExpiration(Timers& timers) = 0;
};

typedef std::unique_ptr<TimerEvent> timer_ptr;

class Timers
{
private:
    typedef std::list<timer_ptr> timerlist_t;
    timerlist_t timerlist;
    DWORD currentId;

public:
    Timers();
    virtual ~Timers();
    
    // Should be called periodically to process complete timers
    void Process();

    // Adds a new timer
    DWORD AddTimer(timer_ptr e);

    // Removes a timer
    bool RemoveTimer(DWORD id);
    void RemoveAllTimers();
};