Timer.h

/*
 * Distributed under the OSI-approved Apache License, Version 2.0.  See
 * accompanying file Copyright.txt for details.
 *
 * Timer.h
 *
 *  Created on: Apr 4, 2017
 *      Author: wfg
 */

#ifndef ADIOS2_CORE_TIMER_H_
#define ADIOS2_CORE_TIMER_H_

/// \cond EXCLUDE_FROM_DOXYGEN
#include <chrono>
#include <string>
/// \endcond

#include "adios2/ADIOSConfig.h"
#include "adios2/core/Support.h"

namespace adios
{
namespace profiling
{

class Timer
{

public:
    const std::string m_Process;
    unsigned long long int m_ProcessTime = 0;

    /**
     * Timer object constructor using std::chrono class
     * @param process name of process to be measured
     * @param resolution time resolution (mus, ms, s, etc.) from Resolutions in
     * core/Support.h
     * @param debugMode true: additional checks and exceptions, false: no checks
     */
    Timer(const std::string process, const Support::Resolutions resolution,
          const bool debugMode = false);

    ~Timer() = default;

    ///< set time to start counting for a process
    void SetInitialTime();

    ///< sets time to measure, it will add to overall process time
    void SetTime();

    std::string GetUnits() const;

private:
    const Support::Resolutions m_Resolution;
    const bool m_DebugMode = false;
    std::chrono::time_point<std::chrono::high_resolution_clock> m_InitialTime;
    std::chrono::time_point<std::chrono::high_resolution_clock> m_ElapsedTime;
    bool m_InitialTimeSet = false;
    long long int GetCurrentTime(); ///< called by SetTime
};

} // end namespace profiling
} // end namespace adios

#endif /* ADIOS2_CORE_TIMER_H_ */