stopwatch.h

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// License: Apache 2.0. See LICENSE file in root directory.
// Copyright(c) 2020 Intel Corporation. All Rights Reserved.

#pragma once

#include "common.h"

namespace utilities
{
    namespace time
    {
        // Timer that counts forward in time (vs backwards in the 'timer' class)
        // It supply a basic stopwatch API, reset, get elapsed time..
        class stopwatch
        {
        public:

            stopwatch()
            {
                _start = clock::now();
            }

            // Reset the stopwatch time
            void reset(clock::time_point start_time = clock::now()) const
            {
                _start = start_time;
            }

            // Get elapsed in milliseconds since timer creation
            double get_elapsed_ms() const
            {
                return std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(get_elapsed()).count();
            }

            // Get elapsed since timer creation
            clock::duration get_elapsed() const
            {
                return clock::now() - _start;
            }

            // Get stopwatch start time
            clock::time_point get_start() const
            {
                return _start;
            }

        protected:
            mutable clock::time_point _start;
        };
    }
}