ndn::time::system_clock Class Reference

System clock. More...

#include <ndn-cxx/util/time.hpp>

Public Types
using	duration = boost::chrono::system_clock::duration
typedef duration	Duration
using	period = duration::period
using	rep = duration::rep
using	time_point = boost::chrono::time_point< system_clock >
typedef time_point	TimePoint

Static Public Member Functions
static time_point	from_time_t (std::time_t t) noexcept
static time_point	now () noexcept
static std::time_t	to_time_t (const time_point &t) noexcept

Static Public Attributes
static constexpr bool	is_steady = boost::chrono::system_clock::is_steady

Detailed Description

System clock.

System clock 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. It is the only clock that has the ability to be displayed and converted to/from UNIX timestamp.

To get the current time:

system_clock::TimePoint now = system_clock::now();

To convert a TimePoint to/from UNIX timestamp:

system_clock::TimePoint time = ...; uint64_t timestampInMilliseconds = toUnixTimestamp(time).count(); system_clock::TimePoint time2 = fromUnixTimestamp(milliseconds(timestampInMilliseconds));

Definition at line 186 of file time.hpp.

Member Typedef Documentation

duration

using ndn::time::system_clock::duration = boost::chrono::system_clock::duration

Definition at line 189 of file time.hpp.

Duration

typedef duration ndn::time::system_clock::Duration

Definition at line 196 of file time.hpp.

period

using ndn::time::system_clock::period = duration::period

Definition at line 191 of file time.hpp.

rep

using ndn::time::system_clock::rep = duration::rep

Definition at line 190 of file time.hpp.

time_point

using ndn::time::system_clock::time_point = boost::chrono::time_point<system_clock>

Definition at line 192 of file time.hpp.

TimePoint

typedef time_point ndn::time::system_clock::TimePoint

Definition at line 195 of file time.hpp.

Member Function Documentation

from_time_t()

system_clock::time_point ndn::time::system_clock::from_time_t ( std::time_t  t )

staticnoexcept

Definition at line 64 of file time.cpp.

now()

system_clock::time_point ndn::time::system_clock::now ( )

staticnoexcept

Definition at line 46 of file time.cpp.

to_time_t()

std::time_t ndn::time::system_clock::to_time_t ( const time_point &  t )

staticnoexcept

Definition at line 58 of file time.cpp.

Member Data Documentation

is_steady

constexpr bool ndn::time::system_clock::is_steady = boost::chrono::system_clock::is_steady

static

Definition at line 193 of file time.hpp.