Timer.h

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#ifndef TIMER_H
#define TIMER_H
 
template <class T>
class Timer
{
public:
    inline constexpr Timer()
    : m_isRunning(false)
    , m_started(0) {};
 
    void start();
    void stop(){m_isRunning = false;}
    bool running()const {return m_isRunning;}
    bool expired(T msPeriod); // returns true only once after expiration, then stops running
    T elapsed(); // returns the time in milliseconds since the timer was started or 0 otherwise
    bool expired_cont(T msPeriod); // return true when continuosly when expired / not running
protected:
    T started()const {return m_started;}
private:
    bool m_isRunning;
    T m_started;
};
 
#if __cplusplus>=201103L
using LongTimer = Timer<unsigned long>;
#else
typedef Timer<unsigned long> LongTimer;
#endif
#if __cplusplus>=201103L
using ShortTimer = Timer<unsigned short>;
#else
typedef Timer<unsigned short> ShortTimer;
#endif
 
#endif /* TIMER_H */