| <?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.date_period_calc"> |
| <title>Date Period Calculations</title> |
| |
| <para> |
| Calculates if a date is in an 'irregular' collection of periods using period calculation functions. |
| </para> |
| <programlisting> |
| <![CDATA[ |
| /* |
| This example demonstrates a simple use of periods for the calculation |
| of date information. |
| |
| The example calculates if a given date is a weekend or holiday |
| given an exclusion set. That is, each weekend or holiday is |
| entered into the set as a time interval. Then if a given date |
| is contained within any of the intervals it is considered to |
| be within the exclusion set and hence is a offtime. |
| |
| Output: |
| Number Excluded Periods: 5 |
| 20020202/20020203 |
| 20020209/20020210 |
| 20020212/20020212 |
| 20020216/20020217 |
| In Exclusion Period: 20020216 --> 20020216/20020217 |
| 20020223/20020224 |
| |
| */ |
| |
| |
| #include "boost/date_time/gregorian/gregorian.hpp" |
| #include <set> |
| #include <algorithm> |
| #include <iostream> |
| |
| typedef std::set<boost::gregorian::date_period> date_period_set; |
| |
| //Simple population of the exclusion set |
| date_period_set |
| generateExclusion() |
| { |
| using namespace boost::gregorian; |
| date_period periods_array[] = |
| { date_period(date(2002,Feb,2), date(2002,Feb,4)),//weekend of 2nd-3rd |
| date_period(date(2002,Feb,9), date(2002,Feb,11)), |
| date_period(date(2002,Feb,16), date(2002,Feb,18)), |
| date_period(date(2002,Feb,23), date(2002,Feb,25)), |
| date_period(date(2002,Feb,12), date(2002,Feb,13))//a random holiday 2-12 |
| }; |
| const int num_periods = sizeof(periods_array)/sizeof(date_period); |
| |
| date_period_set ps; |
| //insert the periods in the set |
| std::insert_iterator<date_period_set> itr(ps, ps.begin()); |
| std::copy(periods_array, periods_array+num_periods, itr ); |
| return ps; |
| |
| } |
| |
| |
| int main() |
| { |
| using namespace boost::gregorian; |
| |
| date_period_set ps = generateExclusion(); |
| std::cout << "Number Excluded Periods: " << ps.size() << std::endl; |
| |
| date d(2002,Feb,16); |
| date_period_set::const_iterator i = ps.begin(); |
| //print the periods, check for containment |
| for (;i != ps.end(); i++) { |
| std::cout << to_iso_string(*i) << std::endl; |
| //if date is in exclusion period then print it |
| if (i->contains(d)) { |
| std::cout << "In Exclusion Period: " |
| << to_iso_string(d) << " --> " << to_iso_string(*i) |
| << std::endl; |
| } |
| } |
| |
| return 0; |
| |
| } |
| |
| ]]> |
| </programlisting> |
| </section> |