| // min_time_point.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/typeof/boost/chrono/chrono.hpp> |
| #include <boost/type_traits.hpp> |
| |
| #include <iostream> |
| |
| using namespace boost::chrono; |
| |
| template <class Rep, class Period> |
| void print_duration(std::ostream& os, duration<Rep, Period> d) |
| { |
| os << d.count() << " * " << Period::num << '/' << Period::den << " seconds\n"; |
| } |
| |
| namespace my_ns { |
| // Example min utility: returns the earliest time_point |
| // Being able to *easily* write this function is a major feature! |
| template <class Clock, class Duration1, class Duration2> |
| inline |
| typename boost::common_type<time_point<Clock, Duration1>, |
| time_point<Clock, Duration2> >::type |
| min BOOST_PREVENT_MACRO_SUBSTITUTION (time_point<Clock, Duration1> t1, time_point<Clock, Duration2> t2) |
| { |
| return t2 < t1 ? t2 : t1; |
| } |
| } |
| void test_min() |
| { |
| #if 1 |
| typedef time_point<system_clock, |
| boost::common_type<system_clock::duration, seconds>::type> T1; |
| typedef time_point<system_clock, |
| boost::common_type<system_clock::duration, nanoseconds>::type> T2; |
| typedef boost::common_type<T1, T2>::type T3; |
| /*auto*/ T1 t1 = system_clock::now() + seconds(3); |
| /*auto*/ T2 t2 = system_clock::now() + nanoseconds(3); |
| /*auto*/ T3 t3 = (my_ns::min)(t1, t2); |
| #else |
| BOOST_AUTO(t1, system_clock::now() + seconds(3)); |
| BOOST_AUTO(t2, system_clock::now() + nanoseconds(3)); |
| BOOST_AUTO(t3, (min)(t1, t2)); |
| #endif |
| print_duration(std::cout, t1 - t3); |
| print_duration(std::cout, t2 - t3); |
| } |
| |
| int main() |
| { |
| test_min(); |
| return 0; |
| } |
| |