elapsed.h

/*
 * logfunction 
 *
 * Copyright (c) 2020 Rain
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 *
 *   1.  Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *
 *   2.  Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License ("GPL") version 2 or any later version,
 * in which case the provisions of the GPL are applicable instead of
 * the above. If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the BSD license, indicate your decision
 * by deleting the provisions above and replace them with the notice
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 */
#ifndef _LOG_FUNCTION_ELAPSED_H_
#define _LOG_FUNCTION_ELAPSED_H_
#include <string>
#include <time.h>
#include <chrono>
#include "log.h"
class Elapsed {
public:
	Elapsed(const std::string& desc, bool bRunning = true) :
        m_desc(desc),
        m_duration(std::chrono::nanoseconds::zero()){
        if (bRunning) start_running();
	}
	~Elapsed() {
        total_running();
        double msec = m_duration.count() / 1000000.0;
		    LOG_I("used time<%s>: %.3f(ms)", m_desc.c_str(), msec);
	}
    void Start() {
        start_running();
    }
    void Stop() {
        total_running();
        stop_running();
    }
private:
    void stop_running() {
        m_bRunning = false;
    }
    void start_running(){
        m_bRunning = true;
        m_start = std::chrono::system_clock::now();
    }
    void total_running(){
        if (m_bRunning) {
            std::chrono::system_clock::time_point end = std::chrono::system_clock::now();
            m_duration += std::chrono::duration_cast<std::chrono::nanoseconds>(end - m_start);
            m_start = end;
        }
    }
    std::chrono::nanoseconds m_duration;
	std::chrono::system_clock::time_point m_start;
	std::string m_desc;
    bool m_bRunning;
};

#endif