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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

#define BOOST_TIMER_ENABLE_DEPRECATED

#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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