90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
// timer, job_timer, and progress_display sample program -------------------//
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// Copyright Beman Dawes 1998. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/timer for documentation.
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// Revision History
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// 12 Jan 01 Cut time to 1.0 secs to speed regression tests (Beman Dawes)
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// 25 Sep 99 added elapsed_min() and elapsed_max() reporting
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// 16 Jul 99 Second beta
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// 6 Jul 99 Initial boost version
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#include <boost/progress.hpp>
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#include <iostream>
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#include <climits>
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using boost::timer;
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using boost::progress_timer;
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using boost::progress_display;
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using std::cout;
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using std::endl;
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int main() {
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timer t0; // used only for elapsed_max() and elapsed_min()
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cout << "timer::elapsed_min() reports " << t0.elapsed_min() << " seconds\n";
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cout << "timer::elapsed_max() reports " << t0.elapsed_max()
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<< " seconds, which is " << t0.elapsed_max()/3600.0 << " hours\n";
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cout << "\nverify progress_display(0) doesn't divide by zero" << endl;
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progress_display zero( 0 ); // verify 0 doesn't divide by zero
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++zero;
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long loops;
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timer loop_timer;
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const double time = 1.0;
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cout << "\ndetermine " << time << " second iteration count" << endl;
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for ( loops = 0; loops < LONG_MAX
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&& loop_timer.elapsed() < time; ++loops ) {}
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cout << loops << " iterations"<< endl;
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long i;
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bool time_waster; // defeat [some] optimizers by storing result here
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progress_timer pt;
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timer t1;
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timer t4;
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timer t5;
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cout << "\nburn about " << time << " seconds" << endl;
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progress_display pd( loops );
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for ( i = loops; i--; )
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{ time_waster = loop_timer.elapsed() < time; ++pd; }
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timer t2( t1 );
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timer t3;
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t4 = t3;
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t5.restart();
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cout << "\nburn about " << time << " seconds again" << endl;
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pd.restart( loops );
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for ( i = loops; i--; )
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{ time_waster = loop_timer.elapsed() < time; ++pd; }
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if ( time_waster ) cout << ' '; // using time_waster quiets compiler warnings
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progress_display pd2( 50, cout, "\nLead string 1 ", "Lead string 2 ", "Lead string 3 " );
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for ( ; pd2.count() < 50; ++pd2 ) {}
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cout << "\nt1 elapsed: " << t1.elapsed() << '\n';
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cout << "t2 elapsed: " << t2.elapsed() << '\n';
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cout << "t3 elapsed: " << t3.elapsed() << '\n';
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cout << "t4 elapsed: " << t4.elapsed() << '\n';
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cout << "t5 elapsed: " << t5.elapsed() << '\n';
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cout << "t1 and t2 should report the same times (very approximately "
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<< 2*time << " seconds).\n";
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cout << "t3, t4 and t5 should report about the same times,\n";
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cout << "and these should be about half the t1 and t2 times.\n";
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cout << "The following elapsed time should be slightly greater than t1."
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<< endl;
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return 0;
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} // main
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