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/*
*
* Mathematical and Computational Sciences Division
* National Institute of Technology,
* Gaithersburg, MD USA
*
*
* This software was developed at the National Institute of Standards and
* Technology (NIST) by employees of the Federal Government in the course
* of their official duties. Pursuant to title 17 Section 105 of the
* United States Code, this software is not subject to copyright protection
* and is in the public domain. NIST assumes no responsibility whatsoever for
* its use by other parties, and makes no guarantees, expressed or implied,
* about its quality, reliability, or any other characteristic.
*
*/
#ifndef STOPWATCH_H
#define STOPWATCH_H
// for clock() and CLOCKS_PER_SEC
#include <time.h>
namespace TNT
{
inline static double seconds(void)
{
const double secs_per_tick = 1.0 / CLOCKS_PER_SEC;
return ( (double) clock() ) * secs_per_tick;
}
class Stopwatch {
private:
int running_;
double start_time_;
double total_;
public:
inline Stopwatch();
inline void start();
inline double stop();
inline double read();
inline void resume();
inline int running();
};
inline Stopwatch::Stopwatch() : running_(0), start_time_(0.0), total_(0.0) {}
void Stopwatch::start()
{
running_ = 1;
total_ = 0.0;
start_time_ = seconds();
}
double Stopwatch::stop()
{
if (running_)
{
total_ += (seconds() - start_time_);
running_ = 0;
}
return total_;
}
inline void Stopwatch::resume()
{
if (!running_)
{
start_time_ = seconds();
running_ = 1;
}
}
inline double Stopwatch::read()
{
if (running_)
{
stop();
resume();
}
return total_;
}
} /* TNT namespace */
#endif
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