| // timer, job_timer, and progress_display sample program -------------------// |
| |
| // Copyright Beman Dawes 1998. 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 |
| // 12 Jan 01 Cut time to 1.0 secs to speed regression tests (Beman Dawes) |
| // 25 Sep 99 added elapsed_min() and elapsed_max() reporting |
| // 16 Jul 99 Second beta |
| // 6 Jul 99 Initial boost version |
| |
| #include <boost/progress.hpp> |
| #include <iostream> |
| #include <climits> |
| |
| using boost::timer; |
| using boost::progress_timer; |
| using boost::progress_display; |
| using std::cout; |
| using std::endl; |
| |
| int main() { |
| |
| timer t0; // used only for elapsed_max() and elapsed_min() |
| |
| cout << "timer::elapsed_min() reports " << t0.elapsed_min() << " seconds\n"; |
| cout << "timer::elapsed_max() reports " << t0.elapsed_max() |
| << " seconds, which is " << t0.elapsed_max()/3600.0 << " hours\n"; |
| |
| cout << "\nverify progress_display(0) doesn't divide by zero" << endl; |
| progress_display zero( 0 ); // verify 0 doesn't divide by zero |
| ++zero; |
| |
| long loops; |
| timer loop_timer; |
| const double time = 1.0; |
| |
| cout << "\ndetermine " << time << " second iteration count" << endl; |
| for ( loops = 0; loops < LONG_MAX |
| && loop_timer.elapsed() < time; ++loops ) {} |
| cout << loops << " iterations"<< endl; |
| |
| long i; |
| bool time_waster; // defeat [some] optimizers by storing result here |
| |
| progress_timer pt; |
| timer t1; |
| timer t4; |
| timer t5; |
| |
| cout << "\nburn about " << time << " seconds" << endl; |
| progress_display pd( loops ); |
| for ( i = loops; i--; ) |
| { time_waster = loop_timer.elapsed() < time; ++pd; } |
| |
| timer t2( t1 ); |
| timer t3; |
| t4 = t3; |
| t5.restart(); |
| |
| cout << "\nburn about " << time << " seconds again" << endl; |
| pd.restart( loops ); |
| for ( i = loops; i--; ) |
| { time_waster = loop_timer.elapsed() < time; ++pd; } |
| |
| if ( time_waster ) cout << ' '; // using time_waster quiets compiler warnings |
| progress_display pd2( 50, cout, "\nLead string 1 ", "Lead string 2 ", "Lead string 3 " ); |
| for ( ; pd2.count() < 50; ++pd2 ) {} |
| |
| cout << "\nt1 elapsed: " << t1.elapsed() << '\n'; |
| cout << "t2 elapsed: " << t2.elapsed() << '\n'; |
| cout << "t3 elapsed: " << t3.elapsed() << '\n'; |
| cout << "t4 elapsed: " << t4.elapsed() << '\n'; |
| cout << "t5 elapsed: " << t5.elapsed() << '\n'; |
| cout << "t1 and t2 should report the same times (very approximately " |
| << 2*time << " seconds).\n"; |
| cout << "t3, t4 and t5 should report about the same times,\n"; |
| cout << "and these should be about half the t1 and t2 times.\n"; |
| cout << "The following elapsed time should be slightly greater than t1." |
| << endl; |
| return 0; |
| } // main |
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