timer.h

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#pragma once

#include <chrono>
#include <map>
#include <string>

namespace terminus
{

class Timer
{
public:
    using TimerID = unsigned int;
    using TimerMSec = signed int;

protected:
    static TimerMSec toMSec(std::chrono::steady_clock::duration duration);
    static std::chrono::steady_clock::duration fromMSec(TimerMSec duration);

public:
    Timer();

    void pause();
    void pause(bool flag);
    bool isPaused();

    TimerID allocateTimer();
    TimerID allocateTimer(std::string name);

    void releaseTimer(TimerID id);
    void releaseTimer(std::string name);

    bool isAllocated(TimerID id);
    bool isAllocated(std::string name);

    TimerMSec get();
    TimerMSec get(TimerID id);
    TimerMSec get(std::string name);

    void adjust(TimerMSec newNow);
    void adjust(TimerID id, TimerMSec newNow);
    void adjust(std::string name, TimerMSec newNow);

protected:
    TimerID freeTimerID();

    std::chrono::steady_clock::time_point localNow();
    void startPause();
    void endPause();

protected:

    std::chrono::steady_clock m_clock;
    std::chrono::steady_clock::time_point m_pauseNow;
    bool m_isPaused;

    std::chrono::steady_clock::time_point m_baseTimeStamp;

    std::map<TimerID, std::chrono::steady_clock::time_point> m_timeStamps;
    std::map<std::string, TimerID> m_namedTimers;
};

}//namespace terminus