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/* ----------------------------------------------------------------------- *
 * This file is part of GEL, http://www.imm.dtu.dk/GEL
 * Copyright (C) the authors and DTU Informatics
 * For license and list of authors, see ../../doc/intro.pdf
 * ----------------------------------------------------------------------- */

/**
 * @file Timer.h
 * @brief Wall clock timing.
 */

#ifndef __UTIL_OSTIMER_H__
#define __UTIL_OSTIMER_H__

// Created by bdl 5. april 2002
// The purpose of this file is to make a timer function that is as 
// precise as posible on any given platform
#if (_MSC_VER >= 1200)
#pragma warning (disable: 4244)
#endif
#ifdef WIN32
#include <windows.h>
static LARGE_INTEGER    largeInteger;
#else
#include <sys/time.h>
#endif

namespace Util{
        class Timer {
#ifdef WIN32
                double freq;
                double start_count;
#else
                timeval start_time;
#endif
        public:
                void start() {
#ifdef WIN32
                        QueryPerformanceFrequency(&largeInteger);
                        freq = largeInteger.QuadPart;
                        QueryPerformanceCounter(&largeInteger);
                        start_count = largeInteger.QuadPart;
#else
                        gettimeofday(&start_time,0);
#endif
                }

                float get_secs() {
#ifdef WIN32
                        QueryPerformanceCounter(&largeInteger);
                        double now_count = largeInteger.QuadPart;
                        return (float)((now_count-start_count)/freq);
#else
                        timeval now;
                        gettimeofday(&now,0);
                        return (now.tv_sec-start_time.tv_sec) + 
                                (now.tv_usec-start_time.tv_usec)/1.0e6;
#endif
                }
        };
}

#endif