lsst::ap::TimeSpec Class Reference

Wraps the C library timespec struct. More...

#include <Time.h>

Inheritance diagram for lsst::ap::TimeSpec:

Public Member Functions
	TimeSpec ()
	TimeSpec (double const seconds)
TimeSpec &	operator+= (TimeSpec const &ts)
TimeSpec &	operator-= (TimeSpec const &ts)
TimeSpec &	operator= (double const seconds)
TimeSpec &	operator+= (double const seconds)
TimeSpec &	operator-= (double const seconds)
double	seconds () const
TimeSpec &	now ()
TimeSpec &	systemTime ()

Detailed Description

Wraps the C library timespec struct.

Definition at line 48 of file Time.h.

Constructor & Destructor Documentation

lsst::ap::TimeSpec::TimeSpec ( )

inline

Definition at line 52 of file Time.h.

               {
        tv_sec  = 0;
        tv_nsec = 0;
    }

lsst::ap::TimeSpec::TimeSpec

(

double const

seconds

)

Definition at line 62 of file Time.cc.

                                       {
    time_t const sec = DoubleToTime::convert(seconds);
    tv_sec  = sec;
    tv_nsec = static_cast<long>((seconds - static_cast<double>(sec))*1e9);
}

Member Function Documentation

TimeSpec & lsst::ap::TimeSpec::now

(

)

Sets the TimeSpec to the number of seconds and nanoseconds that have elapsed since some arbitrary point in the past.

Definition at line 93 of file Time.cc.

                         {
#if LSST_AP_HAVE_CLOCK_GETTIME
#   if defined(CLOCK_MONOTONIC)
    clock_gettime(CLOCK_MONOTONIC, this);
#   elif defined(CLOCK_HIGHRES)
    clock_gettime(CLOCK_HIGHRES, this);
#   else
    clock_gettime(CLOCK_REALTIME, this); // Use system clock if nothing else is available
#   endif
    return *this;
#else
    return systemTime();
#endif
}

TimeSpec& lsst::ap::TimeSpec::operator+= ( TimeSpec const &  ts )

inline

Definition at line 59 of file Time.h.

                                               {
        tv_sec  += ts.tv_sec;
        tv_nsec += ts.tv_nsec;
        if (tv_nsec >= 1000000000l) {
            tv_nsec -= 1000000000l;
            ++tv_sec;
        }
        return *this;
    }

TimeSpec & lsst::ap::TimeSpec::operator+=

(

double const

seconds

)

Definition at line 77 of file Time.cc.

                                                    {
    time_t const sec = DoubleToTime::convert(seconds);
    tv_sec  += sec;
    tv_nsec += static_cast<long>((seconds - static_cast<double>(sec))*1e9);
    if (tv_nsec >=  1000000000l) {
        tv_nsec -= 1000000000l;
        ++tv_sec;
    }
    return *this;
}

TimeSpec& lsst::ap::TimeSpec::operator-= ( TimeSpec const &  ts )

inline

Definition at line 69 of file Time.h.

                                               {
        tv_sec  -= ts.tv_sec;
        tv_nsec -= ts.tv_nsec;
        if (tv_nsec < 0l) {
            tv_nsec += 1000000000l;
            --tv_sec;
        }
        return *this;
    }

TimeSpec& lsst::ap::TimeSpec::operator-= ( double const  seconds )

inline

Definition at line 83 of file Time.h.

                                                {
        return operator+=(-seconds);
    }

TimeSpec & lsst::ap::TimeSpec::operator=

(

double const

seconds

)

Definition at line 69 of file Time.cc.

                                                   {
    time_t const sec = DoubleToTime::convert(seconds);
    tv_sec  = sec;
    tv_nsec = static_cast<long>((seconds - static_cast<double>(sec))*1e9);
    return *this;
}

double lsst::ap::TimeSpec::seconds ( ) const

inline

Definition at line 87 of file Time.h.

                           {
        return static_cast<double>(tv_sec) + static_cast<double>(tv_nsec)/1e9;
    }

TimeSpec & lsst::ap::TimeSpec::systemTime

(

)

Sets the TimeSpec to the number of seconds and nanoseconds that have elapsed since midnight (0 hour), January 1, 1970.

Definition at line 113 of file Time.cc.

                                {
    ::timeval tv;
    ::gettimeofday(&tv, 0);
    tv_sec  = tv.tv_sec;
    tv_nsec = tv.tv_usec*1000l;
    return *this;
}

---

The documentation for this class was generated from the following files:

• /lsst/home/lsstsw/stack/Linux64/ap/master-g60f1e072bb+1/include/lsst/ap/Time.h
• /lsst/home/lsstsw/stack/Linux64/ap/master-g60f1e072bb+1/src/Time.cc