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// boost timer.hpp header file ---------------------------------------------//
// (C) Copyright Beman Dawes 1994-99. Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// See http://www.boost.org/libs/timer for documentation.
// Revision History
// 01 Apr 01 Modified to use new <boost/limits.hpp> header. (JMaddock)
// 12 Jan 01 Change to inline implementation to allow use without library
// builds. See docs for more rationale. (Beman Dawes)
// 25 Sep 99 elapsed_max() and elapsed_min() added (John Maddock)
// 16 Jul 99 Second beta
// 6 Jul 99 Initial boost version
#ifndef BOOST_TIMER_HPP
#define BOOST_TIMER_HPP
#include <boost/config.hpp>
#include <ctime>
#include <boost/limits.hpp>
# ifdef BOOST_NO_STDC_NAMESPACE
namespace std { using ::clock_t; using ::clock; }
# endif
namespace boost {
// timer -------------------------------------------------------------------//
// A timer object measures elapsed time.
// It is recommended that implementations measure wall clock rather than CPU
// time since the intended use is performance measurement on systems where
// total elapsed time is more important than just process or CPU time.
// Warnings: The maximum measurable elapsed time may well be only 596.5+ hours
// due to implementation limitations. The accuracy of timings depends on the
// accuracy of timing information provided by the underlying platform, and
// this varies a great deal from platform to platform.
class timer
{
public:
timer() { _start_time = std::clock(); } // postcondition: elapsed()==0
// timer( const timer& src ); // post: elapsed()==src.elapsed()
// ~timer(){}
// timer& operator=( const timer& src ); // post: elapsed()==src.elapsed()
void restart() { _start_time = std::clock(); } // post: elapsed()==0
double elapsed() const // return elapsed time in seconds
{ return double(std::clock() - _start_time) / CLOCKS_PER_SEC; }
double elapsed_max() const // return estimated maximum value for elapsed()
// Portability warning: elapsed_max() may return too high a value on systems
// where std::clock_t overflows or resets at surprising values.
{
return (double(std::numeric_limits<std::clock_t>::max())
- double(_start_time)) / double(CLOCKS_PER_SEC);
}
double elapsed_min() const // return minimum value for elapsed()
{ return double(1)/double(CLOCKS_PER_SEC); }
private:
std::clock_t _start_time;
}; // timer
} // namespace boost
#endif // BOOST_TIMER_HPP
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Mr. Shah is a reclusive C++/C# developer lurking somewhere in the depths of the city of London. He learnt physics at Kings' College London and obtained a Master in Science there. Having earned an MCAD, he teeters on the brink of transitioning from C++ to C#, unsure of which language to jump to. Fortunately, he also knows how to use .NET interop to merge code between the two languages (which means he won't have to make the choice anytime soon).
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He maintains a website / blog / FAQ / junk at shexec32.serveftp.net, where he places the best answers he's written to the questions you've asked. If you can find him, maybe you can hire Mr. Shah to help you with anything C++[/CLI]/C#/.NET related
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