qpid::sys::AbsTime Class Reference

Class to represent an instant in time. More...

#include <qpid/sys/Time.h>

List of all members.

Public Member Functions
	AbsTime ()
	AbsTime (const AbsTime &time0, const Duration &duration)
bool	operator== (const AbsTime &t) const
Static Public Member Functions
static AbsTime	now ()
static AbsTime	FarFuture ()
static AbsTime	Epoch ()
Friends
bool	operator< (const AbsTime &a, const AbsTime &b)
bool	operator> (const AbsTime &a, const AbsTime &b)
std::ostream &	operator<< (std::ostream &, const AbsTime &)

---

Detailed Description

Class to represent an instant in time.

The time resolution is in nanosecs, and this is held with 64 bits giving a total time span from about 25 million years ago to 25 million years hence. As an aside the internal time can sensibly be negative meaning before the epoch (probably 1/1/1970 although this class doesn't care).

The AbsTime class is a value class and so you don't need to add any accessors to its internal state. If you think you want to replace its value, you need to construct a new AbsTime and assign it, viz:

AbsTime when = now(); ... when = AbsTime(when, 2*TIME_SEC); // Advance timer 2 secs

AbsTime is not intended to be used to represent calendar dates/times but you can construct a Duration since the Unix Epoch, 1970-1-1-00:00, so that you can convert to a date/time if needed:

int64_t nanosec_since_epoch = Duration(EPOCH, now());

There are some sensible operations that are currently missing from AbsTime, but nearly all that's needed can be done with a mixture of AbsTimes and Durations.

For example, convenience operators to add a Duration and AbsTime returning an AbsTime would fit here (although you can already perform the operation with one of the AbsTime constructors). However trying to add 2 AbsTimes doesn't make sense.

Definition at line 81 of file Time.h.

---

Constructor & Destructor Documentation

qpid::sys::AbsTime::AbsTime

(

)

[inline]

Definition at line 89 of file Time.h.

qpid::sys::AbsTime::AbsTime	(	const AbsTime &	time0,
		const Duration &	duration
	)

---

Member Function Documentation

static AbsTime qpid::sys::AbsTime::Epoch

(

)

[static]

static AbsTime qpid::sys::AbsTime::FarFuture

(

)

[static]

static AbsTime qpid::sys::AbsTime::now

(

)

[static]

bool qpid::sys::AbsTime::operator==

(

const AbsTime &

t

)

const [inline]

Definition at line 98 of file Time.h.

---

Friends And Related Function Documentation

bool operator<	(	const AbsTime &	a,
		const AbsTime &	b
	)		[friend]

Definition at line 132 of file Time.h.

std::ostream& operator<<	(	std::ostream &	,
		const AbsTime &
	)		[friend]

bool operator>	(	const AbsTime &	a,
		const AbsTime &	b
	)		[friend]

Definition at line 134 of file Time.h.

---

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

• qpid/sys/Time.h