1 | // manipulate_clock_object.cpp ----------------------------------------------------------// |
---|---|
2 | |
3 | // Copyright 2008 Howard Hinnant |
4 | // Copyright 2008 Beman Dawes |
5 | // Copyright 2009 Vicente J. Botet Escriba |
6 | |
7 | // Distributed under the Boost Software License, Version 1.0. |
8 | // See http://www.boost.org/LICENSE_1_0.txt |
9 | |
10 | /* |
11 | This code was extracted by Vicente J. Botet Escriba from Beman Dawes time2_demo.cpp which |
12 | was derived by Beman Dawes from Howard Hinnant's time2_demo prototype. |
13 | Many thanks to Howard for making his code available under the Boost license. |
14 | The original code was modified to conform to Boost conventions and to section |
15 | 20.9 Time utilities [time] of the C++ committee's working paper N2798. |
16 | See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2798.pdf. |
17 | |
18 | time2_demo contained this comment: |
19 | |
20 | Much thanks to Andrei Alexandrescu, |
21 | Walter Brown, |
22 | Peter Dimov, |
23 | Jeff Garland, |
24 | Terry Golubiewski, |
25 | Daniel Krugler, |
26 | Anthony Williams. |
27 | */ |
28 | |
29 | #include <boost/chrono/chrono.hpp> |
30 | #include <boost/type_traits.hpp> |
31 | |
32 | #include <iostream> |
33 | |
34 | using namespace boost::chrono; |
35 | |
36 | #if defined _MSC_VER |
37 | #pragma warning(push) |
38 | #pragma warning(disable:4100) |
39 | #endif |
40 | void manipulate_clock_object(system_clock clock) |
41 | #if defined _MSC_VER |
42 | #pragma warning(pop) |
43 | #endif |
44 | { |
45 | system_clock::duration delay = milliseconds(5); |
46 | system_clock::time_point start = clock.now(); |
47 | |
48 | while ((clock.now() - start) <= delay) {} |
49 | |
50 | system_clock::time_point stop = clock.now(); |
51 | system_clock::duration elapsed = stop - start; |
52 | std::cout << "paused "<< nanoseconds(elapsed).count() << " nanoseconds\n"; |
53 | } |
54 | |
55 | |
56 | int main() |
57 | { |
58 | manipulate_clock_object(clock: system_clock()); |
59 | return 0; |
60 | } |
61 | |
62 |