_clock_win32hpcount.h

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/* === S T A R T =========================================================== */

#ifndef __ETL__CLOCK_WIN32HPCOUNT_H
#define __ETL__CLOCK_WIN32HPCOUNT_H

/* === H E A D E R S ======================================================= */

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

/* === M A C R O S ========================================================= */

#if defined(__GNUG__) && defined(__int64)
#undef __int64
#define __int64 long long int
#endif

/* === T Y P E D E F S ===================================================== */

/* === C L A S S E S & S T R U C T S ======================================= */

_ETL_BEGIN_NAMESPACE

class clock_desc_win32hpcount
{
public:
    typedef double value_type;

    static bool realtime()
    { return true; }

    static bool proctime()
    { return false; }

    static value_type
    one_second()
    { return 1.0f; }

    static value_type precision()
    {
        __int64 freq;
        QueryPerformanceFrequency((LARGE_INTEGER*)&freq);
        return one_second()/(value_type)freq;
    }

    static const char *description()
    { return "Win32 QueryPerformanceCounter()"; };

protected:
    typedef __int64 timestamp;

    static void
    get_current_time(timestamp &x)
    { QueryPerformanceCounter((LARGE_INTEGER*)&x);}

    static timestamp
    get_current_time()
    { timestamp ret; QueryPerformanceCounter((LARGE_INTEGER*)&ret); return ret; }

    static value_type
    timestamp_to_seconds(const timestamp &x)
    { return precision()*x; }

    static timestamp
    seconds_to_timestamp(const value_type &x)
    { return (timestamp)(x/precision()); }
};

_ETL_END_NAMESPACE

/* === E N D =============================================================== */

#endif