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timer.cpp
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	#include "timer.h"
	/* -----------------------------------------------------------------------------
	* Initialization of time
	* -------------------------------------------------------------------------- */
	Timer::Timer()
	{
	flag = 0;
	start();
	return;
	}

	/* -----------------------------------------------------------------------------
	* public function, start the timer
	* -------------------------------------------------------------------------- */
	void Timer::start()
	{
	t1 = clock();
	flag \|= 1;

	return;
	}

	/* -----------------------------------------------------------------------------
	* public function, stop the timer
	* -------------------------------------------------------------------------- */
	void Timer::stop()
	{
	if ( flag&1 ) {
	t2 = clock();
	flag \|= 2;
	}
	return;
	}

	/* -----------------------------------------------------------------------------
	* public function, print the total time used after timer stops
	* -------------------------------------------------------------------------- */
	void Timer::print()
	{
	if ( (flag&3) != 3) return;

	cpu_time_used = ((double) (t2 - t1)) / CLOCKS_PER_SEC;
	printf("Total CPU time used: %g seconds.\n", cpu_time_used);

	return;
	}

	/* -----------------------------------------------------------------------------
	* public function, return the total time used up to now, in seconds
	* -------------------------------------------------------------------------- */
	double Timer::elapse()
	{
	if ( (flag&3) != 3) return 0.;
	else return ((double) (t2 - t1)) / CLOCKS_PER_SEC;
	}