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- <?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>
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