Timer.h

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//
// Copyright (c) 2009, Markus Rickert
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * 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 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 HOLDER 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 PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
 
#ifndef _RL_UTIL_TIMER_H_
#define _RL_UTIL_TIMER_H_
 
#include <ctime>
 
#ifdef WIN32
#include <windows.h>
#else // WIN32
#include <unistd.h>
#include <sys/time.h>
#endif // WIN32
 
#include <rl/math/Unit.h>
 
namespace rl
{
    namespace util
    {
        class Timer
        {
        public:
            explicit Timer() :
                begin(),
                end()
            {
#ifdef WIN32
                QueryPerformanceFrequency(&(*this).frequency);
#endif // WIN32
            }
            
            virtual ~Timer()
            {
            }
            
            double elapsed() const
            {
#ifdef WIN32
                return static_cast< double >((*this).end.QuadPart - (*this).begin.QuadPart) / static_cast< double >((*this).frequency.QuadPart); 
#else // WIN32
                return static_cast< double >((*this).end.tv_sec - (*this).begin.tv_sec) + static_cast< double >((*this).end.tv_usec - (*this).begin.tv_usec) / 1000000.0;
#endif // WIN32
            }
            
            static double now()
            {
#ifdef WIN32
                LARGE_INTEGER now;
                QueryPerformanceCounter(&now);
                LARGE_INTEGER frequency;
                QueryPerformanceFrequency(&frequency);
                return static_cast< double >(now.QuadPart) / static_cast< double >(frequency.QuadPart); 
#else // WIN32
                timeval now;
                gettimeofday(&now, NULL);
                return static_cast< double >(now.tv_sec) + static_cast< double >(now.tv_usec) / 1000000.0;
#endif // WIN32
            }
            
            static void sleep(const double& seconds)
            {
#ifdef WIN32
                Sleep(static_cast< unsigned int >(seconds * ::rl::math::UNIT2MILLI));
#else // WIN32
                usleep(static_cast< ::std::size_t >(seconds * ::rl::math::UNIT2MICRO));
#endif // WIN32
            }
            
            void start()
            {
#ifdef WIN32
                QueryPerformanceCounter(&(*this).begin);
#else // WIN32
                gettimeofday(&(*this).begin, NULL);
#endif // WIN32
            }
            
            void stop()
            {
#ifdef WIN32
                QueryPerformanceCounter(&(*this).end);
#else // WIN32
                gettimeofday(&(*this).end, NULL);
#endif // WIN32
            }
            
        protected:
            
        private:
#ifdef WIN32
            LARGE_INTEGER begin;
            
            LARGE_INTEGER end;
            
            LARGE_INTEGER frequency;
#else // WIN32
            timeval begin;
            
            timeval end;
#endif // WIN32
        };
    }
}
 
#endif // _RL_UTIL_TIMER_H_