1// timer, job_timer, and progress_display sample program -------------------//
2
3// Copyright Beman Dawes 1998. Distributed under the Boost
4// Software License, Version 1.0. (See accompanying file
5// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6
7// See http://www.boost.org/libs/timer for documentation.
8
9// Revision History
10// 12 Jan 01 Cut time to 1.0 secs to speed regression tests (Beman Dawes)
11// 25 Sep 99 added elapsed_min() and elapsed_max() reporting
12// 16 Jul 99 Second beta
13// 6 Jul 99 Initial boost version
14
15#define BOOST_TIMER_ENABLE_DEPRECATED
16
17#include <boost/progress.hpp>
18#include <iostream>
19#include <climits>
20
21using boost::timer;
22using boost::progress_timer;
23using boost::progress_display;
24using std::cout;
25using std::endl;
26
27int main() {
28
29 timer t0; // used only for elapsed_max() and elapsed_min()
30
31 cout << "timer::elapsed_min() reports " << t0.elapsed_min() << " seconds\n";
32 cout << "timer::elapsed_max() reports " << t0.elapsed_max()
33 << " seconds, which is " << t0.elapsed_max()/3600.0 << " hours\n";
34
35 cout << "\nverify progress_display(0) doesn't divide by zero" << endl;
36 progress_display zero( 0 ); // verify 0 doesn't divide by zero
37 ++zero;
38
39 long loops;
40 timer loop_timer;
41 const double time = 1.0;
42
43 cout << "\ndetermine " << time << " second iteration count" << endl;
44 for ( loops = 0; loops < LONG_MAX
45 && loop_timer.elapsed() < time; ++loops ) {}
46 cout << loops << " iterations"<< endl;
47
48 long i;
49 bool time_waster; // defeat [some] optimizers by storing result here
50
51 progress_timer pt;
52 timer t1;
53 timer t4;
54 timer t5;
55
56 cout << "\nburn about " << time << " seconds" << endl;
57 progress_display pd( loops );
58 for ( i = loops; i--; )
59 { time_waster = loop_timer.elapsed() < time; ++pd; }
60
61 timer t2( t1 );
62 timer t3;
63 t4 = t3;
64 t5.restart();
65
66 cout << "\nburn about " << time << " seconds again" << endl;
67 pd.restart( expected_count_: loops );
68 for ( i = loops; i--; )
69 { time_waster = loop_timer.elapsed() < time; ++pd; }
70
71 if ( time_waster ) cout << ' '; // using time_waster quiets compiler warnings
72 progress_display pd2( 50, cout, "\nLead string 1 ", "Lead string 2 ", "Lead string 3 " );
73 for ( ; pd2.count() < 50; ++pd2 ) {}
74
75 cout << "\nt1 elapsed: " << t1.elapsed() << '\n';
76 cout << "t2 elapsed: " << t2.elapsed() << '\n';
77 cout << "t3 elapsed: " << t3.elapsed() << '\n';
78 cout << "t4 elapsed: " << t4.elapsed() << '\n';
79 cout << "t5 elapsed: " << t5.elapsed() << '\n';
80 cout << "t1 and t2 should report the same times (very approximately "
81 << 2*time << " seconds).\n";
82 cout << "t3, t4 and t5 should report about the same times,\n";
83 cout << "and these should be about half the t1 and t2 times.\n";
84 cout << "The following elapsed time should be slightly greater than t1."
85 << endl;
86 return 0;
87 } // main
88
89
90
91
92

source code of boost/libs/timer/test/original_timer_test.cpp