/*
 * Copyright 2007-2014 Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Documentation written by:
 *		Niels Sascha Reedijk, niels.reedijk@gmail.com
 *		John Scipione, jscipione@gmail.com
 *
 * Corresponds to:
 *		headers/os/support/StopWatch.h rev 19972
 *		src/kits/support/StopWatch.cpp rev 14204
 */


/*!
	\file StopWatch.h
	\ingroup support
	\ingroup libbe
	\brief Provides the BStopWatch class.
*/


/*!
	\class BStopWatch
	\ingroup support
	\ingroup libbe
	\brief A simple class used to time events like a stop watch.

	The interface of this class is designed to behave like a physical
	stop watch. It is useful for debugging parts of your code acting as a
	quick and dirty profiler.

	To use this class first create a BStopWatch object, this starts the timer
	going. You may call Suspend() and Resume() to start and stop the stop
	watch. Call ElapsedTime() to get the current timer count at any time. You
	may call Lap() to start a new lap (up to 10 laps are supported) or call
	Reset() to reset the timer back to 0 clearing all lap info. When the
	object is destroyed the timing information is streamed to standard out
	unless you set the \a silent parameter to \c true in the constructor.

	\since BeOS R3
*/


/*!
	\fn BStopWatch::BStopWatch(const char* name, bool silent)
	\brief Constructs a BStopWatch object and starts the timer.

	This method creates a new BStopWatch object. As soon as the object is
	created the timer starts ticking away.

	If you are profiling your code with this class pass \c false to the
	\a silent parameter to cause the elapsed time information to be
	streamed to standard output when the object is destroyed.

	\param name The name of the stop watch. You may pass \c NULL to create an
	       anonymous stop watch.
	\param silent Pass \c true to suppress time information from streaming to
	       standard output when the object is destroyed.

	\since BeOS R3
*/


/*!
	\fn BStopWatch::~BStopWatch()
	\brief Destroys the object stopping the timer.

	If \a silent was set to \c false in the constructor then this method
	will print elapsed time information to standard output.

	\since BeOS R3
*/


/*!
	\fn void BStopWatch::Resume()
	\brief Resume the timer from a suspended state.

	\see Suspend()

	\since BeOS R3
*/


/*!
	\fn void BStopWatch::Suspend()
	\brief Suspend the timer.

	\see Resume()

	\since BeOS R3
*/


/*!
	\fn bigtime_t BStopWatch::Lap()
	\brief Starts a new timer lap.

	In the current implementation you are unable to actually retrieve the
	timings of each lap, they are only printed to the standard output when the
	object is destroyed. This makes the Lap() method only usable when doing
	some types of profiling.

	\note The current implementation is limited to 10 laps. The value returned
	      is the time that has passed since the timer was last started (not
	      the time that has passed since the last lap). Any call to Lap()
	      beyond the 10th lap will overwrite the last value. Calling Lap()
	      while the timer is suspended does nothing and returns 0.

	\since BeOS R3
*/


/*!
	\fn bigtime_t BStopWatch::ElapsedTime() const
	\brief Gets the elapsed time the object has counted.

	\return The elapsed time in microseconds.

	\since BeOS R3
*/


/*!
	\fn void BStopWatch::Reset()
	\brief Restarts the timer.

	Resets the stop watch clearing the start time and stored laps and
	restarts the timer.

	\since BeOS R3
*/


/*!
	\fn const char* BStopWatch::Name() const
	\brief Returns the name of the stop watch.

	If name was set to \c NULL in the constructor this method returns a blank
	string.

	\return the name of the stop watch set in the constructor.

	\since BeOS R3
*/
