The
Clock
requirements describe a bundle consisting of a
std::chrono::duration
, a
std::chrono::time_point
, and a function
now
(
)
to get the current
time_point
. The origin of the clock's
time_point
is referred to as the clock's epoch.
Requirements
C1
and
C2
denote clock types.
t1
and
t2
are values returned by
C1
::
now
(
)
where the call returning
t1
happens before the call returning
t2
and both of these calls occur before
C1
::
time_point
::
max
(
)
.
|
Expression
|
Return type
|
Operational semantics
|
|
C1
::
rep
|
An arithmetic type or a class emulating an arithmetic type
|
The representation type of
C1
::
duration
.
|
|
C1
::
period
|
A specialization of
std::ratio
|
The tick period of the clock in seconds.
|
|
C1
::
duration
|
std::
chrono
::
duration
<
C1
::
rep
, C1
::
period
>
|
The duration type of the clock.
|
|
C1
::
time_point
|
std::
chrono
::
time_point
<
C1
>
or
std::
chrono
::
time_point
<
C2, C1
::
duration
>
|
The
std::chrono::time_point
type of the clock. C1 and C2 shall refer to the same epoch.
|
|
C1
::
is_steady
|
const
bool
|
true
if
t1
<=
t2
is always
true
and the clock advances at a steady rate relative to real time (so the difference between two distinct reported times is approximately the elapsed real time between the clock updates), otherwise
false
|
|
C1
::
now
(
)
|
C1
::
time_point
|
Returns a
time_point
object representing the current point in time.
|
See also
|
|
determines if a type is a
Clock
(class template)
(variable template)
|