lf::base::Timer Class Reference

Timer class to measure time. More...

#include <lf/base/timer.h>

Classes
struct	cpu_times
	Packages the elapsed wall clock time, user process CPU time, and system process CPU time. More...

Public Member Functions
	Timer (bool start=true) noexcept
	Construct a new timer and optionally start it immediately.
bool	IsStopped () const noexcept
	Is the timer currently stopped?
cpu_times	Elapsed () const noexcept
	Elapsed time since timer start, doesn't stop the timer.
std::string	Format (std::string_view format=kDefaultFormat) const
	Return the number of elapsed seconds of the wall clock time, user time and system time as a formatted string.
void	Start () noexcept
	(Re)starts the timer, i.e. the timer starts counting from 0 when this method is called.
void	Stop () noexcept
	stop the timer, stop counting the elapsed time.
void	Resume () noexcept
	Resume the timer, i.e. start counting from where we stopped the last time.

Static Public Attributes
static std::string	kDefaultFormat
	Default format string that is used by Format()

Private Attributes
cpu_times	times_
bool	is_stopped_

Detailed Description

Timer class to measure time.

Note

This class is very similar to the boost::cpu_timer class.

See also

AutoTimer

boost::cpu_timer

Definition at line 64 of file timer.h.

Constructor & Destructor Documentation

Timer()

lf::base::Timer::Timer ( bool start = true )

inlineexplicitnoexcept

Construct a new timer and optionally start it immediately.

Parameters

start

If set to true, the timer will start immediately. Otherwise it will stay in status stopped.

Definition at line 101 of file timer.h.

References is_stopped_, Start(), and times_.

Member Function Documentation

Elapsed()

Timer::cpu_times lf::base::Timer::Elapsed ( ) const

noexcept

Elapsed time since timer start, doesn't stop the timer.

Definition at line 86 of file timer.cc.

References IsStopped(), lf::base::Timer::cpu_times::system, times_, lf::base::Timer::cpu_times::user, and lf::base::Timer::cpu_times::wall.

Referenced by lf::base::AutoTimer::Elapsed().

Format()

std::string lf::base::Timer::Format

(

std::string_view

format = kDefaultFormat

)

const

Return the number of elapsed seconds of the wall clock time, user time and system time as a formatted string.

Parameters

format

The fmt format string that is used to format the output. See below for possible fmt arguments.

Returns

The formatted string

format named arguments:

The following named arguments can appear in the format parameter:

name	replacement value
w	Elapsed().wall
u	Elapsed().user
s	Elapsed().system
t	Elapsed().user + Elapsed().system
p	(Elapsed().user + Elapsed().system)/Elapsed().wall*100.

Definition at line 100 of file timer.cc.

References lf::base::Timer::cpu_times::system, times_, lf::base::Timer::cpu_times::user, and lf::base::Timer::cpu_times::wall.

Referenced by lf::base::AutoTimer::Format(), and lf::base::AutoTimer::Report().

IsStopped()

bool lf::base::Timer::IsStopped ( ) const

inlinenoexcept

Is the timer currently stopped?

Definition at line 115 of file timer.h.

References is_stopped_.

Referenced by Elapsed(), Resume(), Stop(), and lf::base::AutoTimer::~AutoTimer().

Resume()

void lf::base::Timer::Resume ( )

noexcept

Resume the timer, i.e. start counting from where we stopped the last time.

Definition at line 132 of file timer.cc.

References IsStopped(), Start(), lf::base::Timer::cpu_times::system, times_, lf::base::Timer::cpu_times::user, and lf::base::Timer::cpu_times::wall.

Start()

void lf::base::Timer::Start ( )

noexcept

(Re)starts the timer, i.e. the timer starts counting from 0 when this method is called.

Definition at line 114 of file timer.cc.

References is_stopped_, and times_.

Referenced by Resume(), and Timer().

Stop()

void lf::base::Timer::Stop ( )

noexcept

stop the timer, stop counting the elapsed time.

Definition at line 119 of file timer.cc.

References is_stopped_, IsStopped(), lf::base::Timer::cpu_times::system, times_, lf::base::Timer::cpu_times::user, and lf::base::Timer::cpu_times::wall.

Referenced by lf::base::AutoTimer::~AutoTimer().

Member Data Documentation

is_stopped_

bool lf::base::Timer::is_stopped_

private

Definition at line 169 of file timer.h.

Referenced by IsStopped(), Start(), Stop(), and Timer().

kDefaultFormat

std::string lf::base::Timer::kDefaultFormat

inlinestatic

Initial value:

=
      "{w:.6}s wall, {u:.6}s user + {s:.6}s system = {t:.6}s CPU ({p:.3}%)"

Default format string that is used by Format()

Definition at line 164 of file timer.h.

times_

cpu_times lf::base::Timer::times_

private

Definition at line 168 of file timer.h.

Referenced by Elapsed(), Format(), Resume(), Start(), Stop(), and Timer().

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

• /__w/lehrfempp/lehrfempp/lib/lf/base/timer.h
• /__w/lehrfempp/lehrfempp/lib/lf/base/timer.cc