Multi-Precision Arithmetic by C++ with no
use of assembler
SN library Copyright (C) 1999-2018 K.Tsuru
Reference of class functions part 11
13. Timer class's member functions
The prototype declarations are given
in "timer.h".
It provides a method to measure the processing time. This class uses ANSI C/C++ functions only.
Precision is about 1/CLOCKS_PER_SEC sec or 1.0 sec over 1000.0 seconds. Parallel measurements within ten
timers are available.
Constructors
form
#include "timer.h"
Timer::Timer(int start = 0);
comment If the value "start" is zero (default) it stands by,
else starts the measurement.
member functions
An object "timer" used below is declared as
#include "timer.h"
Timer timer;
Start
function "timer.Start();" resets the timer and starts the
measurement.
form
#include "timer.h"
double Timer::Start();
LapTime
function "timer.LapTime()" returns lap time by a double value
in seconds.
form
#include "timer.h"
double Timer::LapTime();
Stop
function "timer.Stop()" stops the timer and returns a passed time
since start by a double value in seconds.
form
#include "timer.h"
double Timer::Stop();
Notice
On TurboLinux 4.0 the "LapTime()" function is reset i.e. returns a negative
value after about 2,100 seconds since start using "clock()" function. Perhaps an overflow
occurs. Then it uses "time()" function after 1000 seconds which provides an enough significant figures.