Timer.h

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///////////////////////////////////////////////////////////////////////////////
//
// File: Timer.h
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Scientific Computing and Imaging Institute,
// University of Utah (USA) and Department of Aeronautics, Imperial
// College London (UK).
//
// 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.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// Description: Time getting class
//
///////////////////////////////////////////////////////////////////////////////


#ifndef NEKTAR_LIB_UTILITIES_BASIC_UTILS_TIMER_H
#define NEKTAR_LIB_UTILITIES_BASIC_UTILS_TIMER_H

#include <chrono>

#include <LibUtilities/LibUtilitiesDeclspec.h>
#include <LibUtilities/BasicConst/NektarUnivConsts.hpp>

namespace Nektar
{
namespace LibUtilities
{

class Timer
{
    public:
        using Clock       = std::chrono::steady_clock;
        using CounterType = Clock::time_point;
        using Seconds     = std::chrono::duration<NekDouble>;

    public:
        LIB_UTILITIES_EXPORT Timer()  = default;
        LIB_UTILITIES_EXPORT ~Timer() = default;

        Timer(const Timer& rhs)            = delete;
        Timer& operator=(const Timer& rhs) = delete;

        LIB_UTILITIES_EXPORT void Start();
        LIB_UTILITIES_EXPORT void Stop();
        LIB_UTILITIES_EXPORT Seconds Elapsed();

        /// \brief Returns amount of seconds per iteration in
        ///        a test with n iterations.
        LIB_UTILITIES_EXPORT NekDouble TimePerTest(unsigned int n);

    private:
        CounterType m_start;
        CounterType m_end;
};

}
}

#endif //NEKTAR_LIB_UTILITIES_BASIC_UTILS_TIMER_H