| // explore_limits.cpp ----------------------------------------------------------// |
| |
| // Copyright 2008 Howard Hinnant |
| // Copyright 2008 Beman Dawes |
| // Copyright 2009 Vicente J. Botet Escriba |
| |
| // Distributed under the Boost Software License, Version 1.0. |
| // See http://www.boost.org/LICENSE_1_0.txt |
| |
| /* |
| This code was extracted by Vicente J. Botet Escriba from Beman Dawes time2_demo.cpp which |
| was derived by Beman Dawes from Howard Hinnant's time2_demo prototype. |
| Many thanks to Howard for making his code available under the Boost license. |
| The original code was modified to conform to Boost conventions and to section |
| 20.9 Time utilities [time] of the C++ committee's working paper N2798. |
| See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2798.pdf. |
| |
| time2_demo contained this comment: |
| |
| Much thanks to Andrei Alexandrescu, |
| Walter Brown, |
| Peter Dimov, |
| Jeff Garland, |
| Terry Golubiewski, |
| Daniel Krugler, |
| Anthony Williams. |
| */ |
| |
| #include <boost/chrono/chrono.hpp> |
| #include <boost/type_traits.hpp> |
| |
| #include <iostream> |
| |
| using namespace boost::chrono; |
| |
| |
| void explore_limits() |
| { |
| typedef duration<long long, boost::ratio_multiply<boost::ratio<24*3652425,10000>, |
| hours::period>::type> Years; |
| #ifdef BOOST_CHRONO_HAS_CLOCK_STEADY |
| steady_clock::time_point t1( Years(250)); |
| steady_clock::time_point t2(-Years(250)); |
| #else |
| system_clock::time_point t1( Years(250)); |
| system_clock::time_point t2(-Years(250)); |
| #endif |
| // nanosecond resolution is likely to overflow. "up cast" to microseconds. |
| // The "up cast" trades precision for range. |
| microseconds d = time_point_cast<microseconds>(t1) - time_point_cast<microseconds>(t2); |
| std::cout << d.count() << " microseconds\n"; |
| } |
| |
| |
| int main() |
| { |
| explore_limits(); |
| return 0; |
| } |
| |