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+// boost timer.hpp header file ---------------------------------------------//
+
+// Copyright Beman Dawes 1994-99. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// 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