be_time_timer.h

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/*
 * This software was developed at the National Institute of Standards and
 * Technology (NIST) by employees of the Federal Government in the course
 * of their official duties. Pursuant to title 17 Section 105 of the
 * United States Code, this software is not subject to copyright protection
 * and is in the public domain. NIST assumes no responsibility whatsoever for
 * its use by other parties, and makes no guarantees, expressed or implied,
 * about its quality, reliability, or any other characteristic.
 */
 
#ifndef __BE_TIME_TIMER_H__
#define __BE_TIME_TIMER_H__
 
#include <chrono>
#include <cstdint>
#include <functional>
 
#include <be_time.h>
 
namespace BiometricEvaluation
{
        namespace Time
        {
                class Timer
                {
                public:
                        using BE_CLOCK_TYPE =
#ifdef __MIC__
                            std::chrono::monotonic_clock;
#else
                            std::chrono::steady_clock;
#endif
 
                        Timer();
 
                        Timer(
                            const std::function<void()> &func);
 
                        void
                        start();
 
                        void
                        stop();
 
                        uint64_t
                        elapsed(bool nano = false)
                            const;
 
                        std::string
                        elapsedStr(
                           bool displayUnits = false,
                           bool nano = false)
                           const;
 
                        Timer&
                        time(
                            const std::function<void()> &func);
 
                private:
                        bool _inProgress;
 
                        BE_CLOCK_TYPE::time_point _start;
                        BE_CLOCK_TYPE::time_point _finish;
                };
        
                std::ostream&
                operator<<(
                    std::ostream &s,
                    const Timer &timer);
        }
}
 
#endif /* __BE_TIME_TIMER_H__ */