97 lines
2.8 KiB
XML
97 lines
2.8 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
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"../../../tools/boostbook/dtd/boostbook.dtd">
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<!-- Copyright (c) 2001-2004 CrystalClear Software, Inc.
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Subject to the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
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-->
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<section id="date_time.examples.date_period_calc">
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<title>Date Period Calculations</title>
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<para>
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Calculates if a date is in an 'irregular' collection of periods using period calculation functions.
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</para>
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<programlisting>
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<![CDATA[
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/*
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This example demonstrates a simple use of periods for the calculation
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of date information.
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The example calculates if a given date is a weekend or holiday
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given an exclusion set. That is, each weekend or holiday is
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entered into the set as a time interval. Then if a given date
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is contained within any of the intervals it is considered to
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be within the exclusion set and hence is a offtime.
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Output:
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Number Excluded Periods: 5
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20020202/20020203
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20020209/20020210
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20020212/20020212
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20020216/20020217
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In Exclusion Period: 20020216 --> 20020216/20020217
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20020223/20020224
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*/
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#include "boost/date_time/gregorian/gregorian.hpp"
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#include <set>
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#include <algorithm>
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#include <iostream>
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typedef std::set<boost::gregorian::date_period> date_period_set;
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//Simple population of the exclusion set
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date_period_set
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generateExclusion()
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{
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using namespace boost::gregorian;
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date_period periods_array[] =
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{ date_period(date(2002,Feb,2), date(2002,Feb,4)),//weekend of 2nd-3rd
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date_period(date(2002,Feb,9), date(2002,Feb,11)),
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date_period(date(2002,Feb,16), date(2002,Feb,18)),
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date_period(date(2002,Feb,23), date(2002,Feb,25)),
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date_period(date(2002,Feb,12), date(2002,Feb,13))//a random holiday 2-12
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};
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const int num_periods = sizeof(periods_array)/sizeof(date_period);
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date_period_set ps;
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//insert the periods in the set
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std::insert_iterator<date_period_set> itr(ps, ps.begin());
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std::copy(periods_array, periods_array+num_periods, itr );
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return ps;
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}
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int main()
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{
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using namespace boost::gregorian;
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date_period_set ps = generateExclusion();
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std::cout << "Number Excluded Periods: " << ps.size() << std::endl;
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date d(2002,Feb,16);
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date_period_set::const_iterator i = ps.begin();
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//print the periods, check for containment
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for (;i != ps.end(); i++) {
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std::cout << to_iso_string(*i) << std::endl;
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//if date is in exclusion period then print it
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if (i->contains(d)) {
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std::cout << "In Exclusion Period: "
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<< to_iso_string(d) << " --> " << to_iso_string(*i)
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<< std::endl;
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}
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}
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return 0;
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}
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]]>
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</programlisting>
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</section>
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