vrshoot
annotate libs/assimp/boost/timer.hpp @ 0:b2f14e535253
initial commit
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 01 Feb 2014 19:58:19 +0200 |
| parents | |
| children |
| rev | line source |
|---|---|
| nuclear@0 | 1 // boost timer.hpp header file ---------------------------------------------// |
| nuclear@0 | 2 |
| nuclear@0 | 3 // Copyright Beman Dawes 1994-99. Distributed under the Boost |
| nuclear@0 | 4 // Software License, Version 1.0. (See accompanying file |
| nuclear@0 | 5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| nuclear@0 | 6 |
| nuclear@0 | 7 // See http://www.boost.org/libs/timer for documentation. |
| nuclear@0 | 8 |
| nuclear@0 | 9 // Revision History |
| nuclear@0 | 10 // 01 Apr 01 Modified to use new <boost/limits.hpp> header. (JMaddock) |
| nuclear@0 | 11 // 12 Jan 01 Change to inline implementation to allow use without library |
| nuclear@0 | 12 // builds. See docs for more rationale. (Beman Dawes) |
| nuclear@0 | 13 // 25 Sep 99 elapsed_max() and elapsed_min() added (John Maddock) |
| nuclear@0 | 14 // 16 Jul 99 Second beta |
| nuclear@0 | 15 // 6 Jul 99 Initial boost version |
| nuclear@0 | 16 |
| nuclear@0 | 17 #ifndef BOOST_TIMER_HPP |
| nuclear@0 | 18 #define BOOST_TIMER_HPP |
| nuclear@0 | 19 |
| nuclear@0 | 20 //#include <boost/config.hpp> |
| nuclear@0 | 21 #include <ctime> |
| nuclear@0 | 22 //#include <boost/limits.hpp> |
| nuclear@0 | 23 |
| nuclear@0 | 24 # ifdef BOOST_NO_STDC_NAMESPACE |
| nuclear@0 | 25 namespace std { using ::clock_t; using ::clock; } |
| nuclear@0 | 26 # endif |
| nuclear@0 | 27 |
| nuclear@0 | 28 |
| nuclear@0 | 29 namespace boost { |
| nuclear@0 | 30 |
| nuclear@0 | 31 // timer -------------------------------------------------------------------// |
| nuclear@0 | 32 |
| nuclear@0 | 33 // A timer object measures elapsed time. |
| nuclear@0 | 34 |
| nuclear@0 | 35 // It is recommended that implementations measure wall clock rather than CPU |
| nuclear@0 | 36 // time since the intended use is performance measurement on systems where |
| nuclear@0 | 37 // total elapsed time is more important than just process or CPU time. |
| nuclear@0 | 38 |
| nuclear@0 | 39 // Warnings: The maximum measurable elapsed time may well be only 596.5+ hours |
| nuclear@0 | 40 // due to implementation limitations. The accuracy of timings depends on the |
| nuclear@0 | 41 // accuracy of timing information provided by the underlying platform, and |
| nuclear@0 | 42 // this varies a great deal from platform to platform. |
| nuclear@0 | 43 |
| nuclear@0 | 44 class timer |
| nuclear@0 | 45 { |
| nuclear@0 | 46 public: |
| nuclear@0 | 47 timer() { _start_time = std::clock(); } // postcondition: elapsed()==0 |
| nuclear@0 | 48 // timer( const timer& src ); // post: elapsed()==src.elapsed() |
| nuclear@0 | 49 // ~timer(){} |
| nuclear@0 | 50 // timer& operator=( const timer& src ); // post: elapsed()==src.elapsed() |
| nuclear@0 | 51 void restart() { _start_time = std::clock(); } // post: elapsed()==0 |
| nuclear@0 | 52 double elapsed() const // return elapsed time in seconds |
| nuclear@0 | 53 { return double(std::clock() - _start_time) / CLOCKS_PER_SEC; } |
| nuclear@0 | 54 |
| nuclear@0 | 55 double elapsed_max() const // return estimated maximum value for elapsed() |
| nuclear@0 | 56 // Portability warning: elapsed_max() may return too high a value on systems |
| nuclear@0 | 57 // where std::clock_t overflows or resets at surprising values. |
| nuclear@0 | 58 { |
| nuclear@0 | 59 return (double((std::numeric_limits<std::clock_t>::max)()) |
| nuclear@0 | 60 - double(_start_time)) / double(CLOCKS_PER_SEC); |
| nuclear@0 | 61 } |
| nuclear@0 | 62 |
| nuclear@0 | 63 double elapsed_min() const // return minimum value for elapsed() |
| nuclear@0 | 64 { return double(1)/double(CLOCKS_PER_SEC); } |
| nuclear@0 | 65 |
| nuclear@0 | 66 private: |
| nuclear@0 | 67 std::clock_t _start_time; |
| nuclear@0 | 68 }; // timer |
| nuclear@0 | 69 |
| nuclear@0 | 70 } // namespace boost |
| nuclear@0 | 71 |
| nuclear@0 | 72 #endif // BOOST_TIMER_HPP |