_clock_system.h

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

#ifndef __ETL__CLOCK_SYSTEM_H
#define __ETL__CLOCK_SYSTEM_H

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

#ifndef _WIN32
# include <time.h>
# define __sys_clock    ::clock
# define __sys_time ::time
#else
# ifdef __GNUG__
#  include <time.h>
#  define __sys_clock   ::clock
#  define __sys_time    ::time
# else
typedef int clock_t;
typedef int time_t;
extern clock_t _clock();
extern time_t _time(time_t *);
#  define CLOCKS_PER_SEC 1000
#  define __sys_clock   _clock
#  define __sys_time    _time
# endif
#endif

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

/* === 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_sys_clock
{
public:
    typedef float value_type;

    inline static bool realtime()
    { return false; }

    inline static bool proctime()
    { return true; }

    inline static value_type
    one_second()
    { return 1.0f; }

    inline static value_type precision()
    { return one_second()/(value_type)CLOCKS_PER_SEC; }

    inline static const char *description()
    { return "ANSI C clock()"; };

protected:
    typedef clock_t timestamp;

    static void
    get_current_time(timestamp &time)
    { time=__sys_clock(); }

    static timestamp
    get_current_time()
    { return __sys_clock(); }

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

    static timestamp
    seconds_to_timestamp(const value_type &x)
    { return (timestamp)(x*(value_type)CLOCKS_PER_SEC+0.5); }

};

class clock_desc_sys_time
{
public:
    typedef float value_type;

    inline static bool realtime()
    { return true; }

    inline static bool proctime()
    { return false; }

    inline static value_type
    one_second()
    { return 1.0f; }

    inline static value_type precision()
    { return one_second(); }

    inline static const char *description()
    { return "ANSI C time()"; };

protected:
    typedef time_t timestamp;

    static void
    get_current_time(timestamp &time)
    { __sys_time(&time); }

    static timestamp
    get_current_time()
    { return __sys_time(NULL); }

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

    static timestamp
    seconds_to_timestamp(const value_type &x)
    { return (timestamp)(x+(value_type)0.5f); }
};

_ETL_END_NAMESPACE

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

#endif