Stopwatch.hpp

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/*
 * ------------------------------------------------------------------------------------------------------------
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (c) 2018-2020 Lawrence Livermore National Security LLC
 * Copyright (c) 2018-2020 The Board of Trustees of the Leland Stanford Junior University
 * Copyright (c) 2018-2020 TotalEnergies
 * Copyright (c) 2019-     GEOSX Contributors
 * All rights reserved
 *
 * See top level LICENSE, COPYRIGHT, CONTRIBUTORS, NOTICE, and ACKNOWLEDGEMENTS files for details.
 * ------------------------------------------------------------------------------------------------------------
 */
 
#ifndef GEOS_COMMON_STOPWATCH_HPP
#define GEOS_COMMON_STOPWATCH_HPP
 
#include <chrono>
 
namespace geos
{
 
class Stopwatch
{
public:
 
  Stopwatch()
  {
    zero();
  }
 
  Stopwatch( real64 & resultVar )
    : m_result( &resultVar )
  {
    zero();
  }
 
  ~Stopwatch()
  {
    if( m_result )
    {
      *m_result = elapsedTime();
    }
  }
 
  void zero()
  {
    m_start = std::chrono::steady_clock::now();
  }
 
  real64 elapsedTime()
  {
    std::chrono::steady_clock::time_point const end = std::chrono::steady_clock::now();
    std::chrono::duration< real64 > const diff = end - m_start;
    return diff.count();
  }
 
private:
 
  std::chrono::steady_clock::time_point m_start;
 
  real64 * m_result{};
};
 
} // end geosx
 
#endif