mirror of https://github.com/CGAL/cgal
119 lines
3.2 KiB
C++
119 lines
3.2 KiB
C++
// ======================================================================
|
|
//
|
|
// Copyright (c) 1997 The CGAL Consortium
|
|
//
|
|
// This software and related documentation is part of an INTERNAL release
|
|
// of the Computational Geometry Algorithms Library (CGAL). It is not
|
|
// intended for general use.
|
|
//
|
|
// ----------------------------------------------------------------------
|
|
//
|
|
// release :
|
|
// release_date :
|
|
//
|
|
// file : include/CGAL/Real_timer.h
|
|
// package : Timer (1.9)
|
|
// maintainer : Matthias Baesken <baesken@informatik.uni-trier.de>
|
|
// revision : 1.9
|
|
// revision_date : 4 April 2001
|
|
// author(s) : Lutz Kettner <kettner@inf.ethz.ch>
|
|
// Matthias Baesken <baesken@informatik.uni-halle.de>
|
|
// coordinator : INRIA, Sophia Antipolis
|
|
//
|
|
// A timer class to measure real-time.
|
|
// ======================================================================
|
|
|
|
#ifndef CGAL_REAL_TIMER_H
|
|
#define CGAL_REAL_TIMER_H 1
|
|
|
|
#include <CGAL/basic.h>
|
|
// For the numerical limits
|
|
#include <float.h>
|
|
|
|
CGAL_BEGIN_NAMESPACE
|
|
|
|
// SECTION: A Timer Measuring Real-Time
|
|
// ========================================================================
|
|
//
|
|
// DEFINITION
|
|
//
|
|
// A timer `t' of type Real_timer is an object with a state. It is either
|
|
// running or it is stopped. The state is controlled with `t.start()'
|
|
// and `t.stop()'. The timer counts the time elapsed since its creation
|
|
// or last reset. It counts only the time where it is in the running
|
|
// state. The time information is given in seconds.
|
|
|
|
class Real_timer {
|
|
private:
|
|
double elapsed;
|
|
double started;
|
|
int interv;
|
|
bool running;
|
|
|
|
static bool m_failed;
|
|
|
|
double get_real_time() const; // in seconds
|
|
double compute_precision() const; // in seconds
|
|
public:
|
|
Real_timer() : elapsed(0.0), started(0.0), interv(0), running(false) {}
|
|
|
|
void start();
|
|
void stop ();
|
|
void reset();
|
|
bool is_running() const { return running; }
|
|
|
|
double time() const;
|
|
int intervals() const { return interv; }
|
|
double precision() const;
|
|
// Returns timer precison. Computes it dynamically at first call.
|
|
// Returns -1.0 if timer system call fails, which, for a proper coded
|
|
// test towards precision leads to an immediate stop of an otherwise
|
|
// infinite loop (fixed tolerance * total time >= precision).
|
|
double max() const { return DBL_MAX; }
|
|
};
|
|
|
|
|
|
// -----------------------------------------------------------------------
|
|
|
|
// Member functions for Real_timer
|
|
// ===========================
|
|
|
|
inline void Real_timer::start() {
|
|
CGAL_precondition( ! running);
|
|
started = get_real_time();
|
|
running = true;
|
|
++ interv;
|
|
}
|
|
|
|
inline void Real_timer::stop() {
|
|
CGAL_precondition( running);
|
|
double t = get_real_time();
|
|
elapsed += (t - started);
|
|
started = 0.0;
|
|
running = false;
|
|
}
|
|
|
|
inline void Real_timer::reset() {
|
|
interv = 0;
|
|
elapsed = 0.0;
|
|
if (running) {
|
|
started = get_real_time();
|
|
++ interv;
|
|
} else {
|
|
started = 0.0;
|
|
}
|
|
}
|
|
|
|
inline double Real_timer::time() const {
|
|
if (running) {
|
|
double t = get_real_time();
|
|
return elapsed + (t - started);
|
|
}
|
|
return elapsed;
|
|
}
|
|
|
|
CGAL_END_NAMESPACE
|
|
|
|
#endif // CGAL_REAL_TIMER_H //
|
|
// EOF //
|