stopwatch.h

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#ifndef MF_UTILITY_STOPWATCH_H_
#define MF_UTILITY_STOPWATCH_H_

#include "../common.h"
#include <chrono>

namespace mf {


class stopwatch {
public:
    using clock_type = std::chrono::high_resolution_clock;
    using time_point_type = typename clock_type::time_point;
    using duration_type = typename clock_type::duration;

private:
    duration_type total_duration_ = duration_type::zero();
    time_point_type start_time_;
    bool running_ = false;

public:
    void reset() {
        total_duration_ = duration_type::zero();
        running_ = false;
    }
    
    void start() {
        start_time_ = clock_type::now();
        running_ = true;
    }
    
    void stop() {
        if(! running_) return;
        running_ = false;
        time_point_type end_time = clock_type::now();
        duration_type duration = end_time - start_time_;
        total_duration_ += duration;
        start_time_ = end_time;
    }


    duration_type total_duration() const {
        MF_ASSERT(! running_);
        return total_duration_;
    }
};

}

#endif