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3.4 KiB
3.4 KiB
| title |
|---|
| Clocks |
Macros
Default macro definitions.
Define these in etl_profile.h to set your own duration types for the clocks.
| Macro | Definition |
|---|---|
ETL_CHRONO_SYSTEM_CLOCK_DURATION |
etl::chrono::nanoseconds |
ETL_CHRONO_SYSTEM_CLOCK_IS_STEADY |
true |
ETL_CHRONO_HIGH_RESOLUTION_CLOCK_DURATION |
etl::chrono::nanoseconds |
ETL_CHRONO_HIGH_RESOLUTION_CLOCK_IS_STEADY |
true |
ETL_CHRONO_STEADY_CLOCK_DURATION |
etl::chrono::nanoseconds |
Platform clock access
Declarations of the functions that must be defined to interface the clocks with the underlying platform.
extern "C" ETL_CHRONO_SYSTEM_CLOCK_DURATION::rep etl_get_system_clock();
extern "C" ETL_CHRONO_HIGH_RESOLUTION_CLOCK_DURATION::rep etl_get_high_resolution_clock();
extern "C" ETL_CHRONO_STEADY_CLOCK_DURATION::rep etl_get_steady_clock();
These functions must return the current count of the underlying clock. The value is in terms of the clock duration defined for that clock.
Example
If the system_clock duration is set to etl::chrono::nanoseconds, then a return value of 1000 represents 1000ns.
system_clock
class system_clock
Member types
using duration = ETL_CHRONO_SYSTEM_CLOCK_DURATION
using rep = duration::rep
using period = duration::period
using time_point = time_point<system_clock, duration>
Member functions
static time_point now() ETL_NOEXCEPT
static time_t to_time_t(const time_point& t) ETL_NOEXCEPT
static time_point from_time_t(time_t t) ETL_NOEXCEPT
high_resolution_clock
class high_resolution_clock
Member types
using duration = ETL_CHRONO_HIGH_RESOLUTION_CLOCK_DURATION
using rep = duration::rep
using period = duration::period
using time_point = time_point<high_resolution_clock, duration>
Member functions
static time_point now() ETL_NOEXCEPT
steady_clock
class steady_clock
Member types
using duration = ETL_CHRONO_STEADY_CLOCK_DURATION
using rep = duration::rep
using period = duration::period
using time_point = time_point<steady_clock, duration>
Member functions
static time_point now() ETL_NOEXCEPT
system_time
template <typename Duration>
using sys_time = etl::chrono::time_point<etl::chrono::system_clock, Duration>
using sys_seconds = sys_time<etl::chrono::seconds>
using sys_days = sys_time<etl::chrono::days>
local_time
struct local_t
template <typename TDuration>
using local_time = etl::chrono::time_point<etl::chrono::local_t, TDuration>
using local_seconds = local_time<etl::chrono::seconds>
using local_days = local_time<etl::chrono::days>
clock_cast
Cast a time point from one clock to another.
This implementation assumes all clock epochs are the same.
template <typename TToClock,
typename TFromClock,
typename TFromDuration>
ETL_CONSTEXPR14 etl::chrono::time_point<TToClock,
typename TToClock::duration>
clock_cast(const etl::chrono::time_point<TFromClock, TFromDuration>& from_time_point) ETL_NOEXCEPT