/****************************************************************************     Copyright (c) 1993 1994 1995     By Miron Livny, Madison, Wisconsin     All Rights Reserved.     UNDER NO CIRCUMSTANCES IS THIS PROGRAM TO BE COPIED OR DISTRIBUTED     WITHOUT PERMISSION OF MIRON LIVNY     modified 11/3/95 by Tian Zhang for universal clock ticking ****************************************************************************/#ifndef TIMEUTIL_H#define TIMEUTIL_H/******************************************************************************	                    timeutil.h******************************************************************************/#include <iostream.h>#include <fstream.h>#include <assert.h>#include <unistd.h>#include <time.h>#include <sys/times.h>/*********************************************************************Maintain timers for performance monitoring.  Three versions of "time"are maintained, "system", "user", and "wall clock".  POSIX.1 compliantroutines are used throughout for portability.*********************************************************************/class Timer {friend ostream& operator <<( ostream&, Timer& );friend ofstream& operator <<( ofstream&, Timer& );public:		// Constructors and destructors.  Names are optional, and		// if provided will be used by the default display routine.	Timer();	Timer( const char *nm );	Timer( const Timer& t );	~Timer();		// Stopwatch "buttons"	void Start();	void Stop();	void Clear();		// Binary arithmetic operators.  Note: Operations on		// running timers are prohibited - an assertion violation		// will result.	Timer & operator += ( const Timer& t );	Timer & operator -= ( const Timer& t );	Timer operator + (const Timer & t ) const;	Timer operator - (const Timer & t ) const;		// Display with an optional message.  If set, the name will		// be used in place of a message for the default version.	void Display();	void Display( const char *msg );		// Get individual member values.	double SystemTime();	double UserTime();	double WallClockTime();private:	void simple_display();	char		*name;	int		is_running;	int 		clock_tick;	clock_t		system_started;	clock_t		user_started;	clock_t		wall_clock_started;	clock_t		system_accum;	clock_t		user_accum;	clock_t		wall_clock_accum;};ostream& operator<<(ostream&, Timer& );/*********************************************************************Maintain simple counters for performance monitoring.*********************************************************************/class Counter {friend ostream& operator <<( ostream&, Counter& );public:		// Constructors and destructors.  Names are optional, and		// if provided will be used by the default display routine.	Counter() { val = 0; }	Counter( const char *nm );	Counter( const Counter& c );	~Counter();		// Basic operations on counters.	void Clear() { val = 0; }	void Inc() { val += 1; }		// Binary arithmetic operators.	Counter & operator += ( const Counter& c );	Counter & operator -= ( const Counter& c );	Counter operator + (const Counter & c ) const;	Counter operator - (const Counter & c ) const;		// Display with an optional message.  If set, the name will		// be used in place of a message for the default version.	void Display();	void Display( const char *msg );		// Get current value.	long Ticks() { return val; }private:	long		val;	char		*name;};ostream& operator<<(ostream&, Counter& );/*****************************************************************Maintain a "time stamp", (current date and time).  The time stampis initialized by its constructor, and can be reset at any timeusing the "Set" function.  The insertion operator "<<" isoverloaded so that you can insert a time stamp directlyinto an output stream, i.e.	cout << some_time_stamp << endl;******************************************************************/class TimeStamp {friend ostream& operator <<( ostream&, TimeStamp& );public:	TimeStamp() { val = time(0); }	void Set();	void Display();private:	time_t	val;};ostream& operator<<(ostream&, TimeStamp& );#endif TIMEUTIL_H