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// 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::elapased_min() reports " << t0.elapsed_min() << " seconds\n";
cout << "timer::elapased_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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