| <?xml version="1.0" encoding="utf-8"?> |
| <!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN" |
| "../../../tools/boostbook/dtd/boostbook.dtd"> |
| |
| <!-- Copyright (c) 2001-2004 CrystalClear Software, Inc. |
| Subject to the Boost Software License, Version 1.0. |
| (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) |
| --> |
| |
| <section id="date_time.examples.time_periods"> |
| <title>Time Periods</title> |
| |
| <para> |
| Demonstrate some simple uses of time periods. |
| </para> |
| <programlisting> |
| <![CDATA[ |
| |
| /* Some simple examples of constructing and calculating with times |
| * Returns: |
| * [2002-Feb-01 00:00:00/2002-Feb-01 23:59:59.999999999] |
| * contains 2002-Feb-01 03:00:05 |
| * [2002-Feb-01 00:00:00/2002-Feb-01 23:59:59.999999999] |
| * intersected with |
| * [2002-Feb-01 00:00:00/2002-Feb-01 03:00:04.999999999] |
| * is |
| * [2002-Feb-01 00:00:00/2002-Feb-01 03:00:04.999999999] |
| */ |
| |
| #include "boost/date_time/posix_time/posix_time.hpp" |
| #include <iostream> |
| |
| using namespace boost::posix_time; |
| using namespace boost::gregorian; |
| |
| //Create a simple period class to contain all the times in a day |
| class day_period : public time_period |
| { |
| public: |
| day_period(date d) : time_period(ptime(d),//midnight |
| ptime(d,hours(24))) |
| {} |
| |
| }; |
| |
| int |
| main() |
| { |
| |
| date d(2002,Feb,1); //an arbitrary date |
| //a period that represents a day |
| day_period dp(d); |
| ptime t(d, hours(3)+seconds(5)); //an arbitray time on that day |
| if (dp.contains(t)) { |
| std::cout << to_simple_string(dp) << " contains " |
| << to_simple_string(t) << std::endl; |
| } |
| //a period that represents part of the day |
| time_period part_of_day(ptime(d, hours(0)), t); |
| //intersect the 2 periods and print the results |
| if (part_of_day.intersects(dp)) { |
| time_period result = part_of_day.intersection(dp); |
| std::cout << to_simple_string(dp) << " intersected with\n" |
| << to_simple_string(part_of_day) << " is \n" |
| << to_simple_string(result) << std::endl; |
| } |
| |
| |
| return 0; |
| } |
| |
| ]]> |
| </programlisting> |
| </section> |