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#ifndef TIMER_H
#define TIMER_H
#include <ctime>
#include <iostream>
#include <iomanip>
#include "Util.h"
class Timer
{
friend std::ostream& operator<<(std::ostream& os, Timer& t);
private:
bool running;
time_t start_time;
double elapsed_time();
public:
// 'running' is initially false. A timer needs to be explicitly started
// using 'start' or 'restart'
Timer() : running(false), start_time(0) { }
void start(const char* msg = 0);
// void restart(const char* msg = 0);
// void stop(const char* msg = 0);
void check(const char* msg = 0);
}; // class timer
//===========================================================================
// Return the total time that the timer has been in the "running"
// state since it was first "started" or last "restarted". For
// "short" time periods (less than an hour), the actual cpu time
// used is reported instead of the elapsed time.
inline double Timer::elapsed_time()
{
time_t now;
time(&now);
return difftime(now, start_time);
} // timer::elapsed_time
//===========================================================================
// Start a timer. If it is already running, let it continue running.
// Print an optional message.
inline void Timer::start(const char* msg)
{
// Print an optional message, something like "Starting timer t";
if (msg) TRACE_ERR(msg << std::endl);
// Return immediately if the timer is already running
if (running) return;
// Change timer status to running
running = true;
// Set the start time;
time(&start_time);
} // timer::start
//===========================================================================
// Turn the timer off and start it again from 0. Print an optional message.
/*
inline void Timer::restart(const char* msg)
{
// Print an optional message, something like "Restarting timer t";
if (msg) TRACE_ERR(msg << std::endl);
// Set the timer status to running
running = true;
// Set the accumulated time to 0 and the start time to now
acc_time = 0;
start_clock = clock();
start_time = time(0);
} // timer::restart
*/
//===========================================================================
// Stop the timer and print an optional message.
/*
inline void Timer::stop(const char* msg)
{
// Print an optional message, something like "Stopping timer t";
check(msg);
// Recalculate and store the total accumulated time up until now
if (running) acc_time += elapsed_time();
running = false;
} // timer::stop
*/
//===========================================================================
// Print out an optional message followed by the current timer timing.
inline void Timer::check(const char* msg)
{
// Print an optional message, something like "Checking timer t";
if (msg) TRACE_ERR(msg << " : ");
TRACE_ERR("[" << std::setiosflags(std::ios::fixed) << std::setprecision(2)
<< (running ? elapsed_time() : 0) << "] seconds\n");
} // timer::check
//===========================================================================
// Allow timers to be printed to ostreams using the syntax 'os << t'
// for an ostream 'os' and a timer 't'. For example, "cout << t" will
// print out the total amount of time 't' has been "running".
inline std::ostream& operator<<(std::ostream& os, Timer& t)
{
#ifdef TRACE_ENABLE
os << std::setprecision(2) << std::setiosflags(std::ios::fixed)
<< (t.running ? t.elapsed_time() : 0);
#endif
return os;
}
//===========================================================================
#endif // TIMER_H
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