Timer.h

/**
 * Copyright (c) Stanford University, The Regents of the University of California, and others.
 *
 * All Rights Reserved.
 *
 * See Copyright-SimVascular.txt for additional details.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject
 * to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 */
 
#ifndef TIMER_H 
#define TIMER_H 
 
#include <chrono>
#include <iostream>
#include <string>
 
/// @brief Keep track of time
class Timer 
{
  public:
 
    double get_elapsed_time()
    {
      return get_time() - current_time;
    }
 
    double get_time()
    {
      auto now = std::chrono::system_clock::now();
      auto now_ms = std::chrono::time_point_cast<std::chrono::milliseconds>(now);
 
      auto value = now_ms.time_since_epoch();
      auto duration = value.count() / 1000.0;
      return static_cast<double>(duration);
    }
 
    void set_time()
    {
      current_time = get_time();
    }
 
    double current_time;
};
 
#endif