qi::SystemClock Class Reference

The SystemClock class represents the system-wide real time wall clock. It may not be monotonic: on most systems, the system time can be adjusted at any moment. More...

#include <clock.hpp>

Public Types
typedef int64_t	rep
	The representation type of the duration and time_point. More...
typedef boost::nano	period
	The tick period of the clock in nanoseconds. More...
typedef boost::chrono::duration< rep, period >	duration
	The duration type of the clock. More...
typedef boost::chrono::time_point < SystemClock >	time_point

Static Public Member Functions
static time_point	now ()
	Returns a time_point representing the current value of the clock. More...
static std::time_t	to_time_t (const time_point &t) throw ()
	Converts a system clock time point to std::time_t. More...
static time_point	from_time_t (const std::time_t &t) throw ()
	Converts std::time_t to a system clock time point. More...

Public Attributes
QI_API_DEPRECATED typedef time_point	WallClockTimePoint
bool	is_steady = false

Detailed Description

The SystemClock class represents the system-wide real time wall clock. It may not be monotonic: on most systems, the system time can be adjusted at any moment.

Definition at line 158 of file clock.hpp.

Member Typedef Documentation

typedef boost::chrono::duration<rep, period> qi::SystemClock::duration

The duration type of the clock.

Definition at line 163 of file clock.hpp.

typedef boost::nano qi::SystemClock::period

The tick period of the clock in nanoseconds.

Definition at line 162 of file clock.hpp.

typedef int64_t qi::SystemClock::rep

The representation type of the duration and time_point.

Definition at line 161 of file clock.hpp.

typedef boost::chrono::time_point<SystemClock> qi::SystemClock::time_point

The time_point type of the clock. Different clocks are permitted to share a time_point definition if it is valid to compare their time_points by comparing their respective durations.

Definition at line 169 of file clock.hpp.

Member Function Documentation

static time_point qi::SystemClock::from_time_t ( const std::time_t &  t ) throw ( )

static

Converts std::time_t to a system clock time point.

Parameters

t	std::time to convert.

Returns

A time point representing t.

static time_point qi::SystemClock::now ( )

static

Returns a time_point representing the current value of the clock.

static std::time_t qi::SystemClock::to_time_t ( const time_point &  t ) throw ( )

static

Converts a system clock time point to std::time_t.

Parameters

t	Time point to convert.

Returns

A std::time_t representing t.

Member Data Documentation

bool qi::SystemClock::is_steady = false

true if t1 <= t2 is always true, else false.

Note

A SystemClock is never steady.

Definition at line 173 of file clock.hpp.

QI_API_DEPRECATED typedef time_point qi::SystemClock::WallClockTimePoint

Definition at line 178 of file clock.hpp.

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

• /home/opennao/work/master/sdk/libqi/qi/clock.hpp