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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.print_holidays">
- <title>Print Holidays</title>
- <para>
- This is an example of using functors to define a holiday schedule
- </para>
- <programlisting>
- <![CDATA[
- /* Generate a set of dates using a collection of date generators
- * Output looks like:
- * Enter Year: 2002
- * 2002-Jan-01 [Tue]
- * 2002-Jan-21 [Mon]
- * 2002-Feb-12 [Tue]
- * 2002-Jul-04 [Thu]
- * 2002-Sep-02 [Mon]
- * 2002-Nov-28 [Thu]
- * 2002-Dec-25 [Wed]
- * Number Holidays: 7
- */
- #include "boost/date_time/gregorian/gregorian.hpp"
- #include <algorithm>
- #include <functional>
- #include <vector>
- #include <iostream>
- #include <set>
- void
- print_date(boost::gregorian::date d)
- {
- using namespace boost::gregorian;
- #if defined(BOOST_DATE_TIME_NO_LOCALE)
- std::cout << to_simple_string(d) << " [" << d.day_of_week() << "]\n";
- #else
- std::cout << d << " [" << d.day_of_week() << "]\n";
- #endif
- }
- int
- main() {
- std::cout << "Enter Year: ";
- int year;
- std::cin >> year;
- using namespace boost::gregorian;
- //define a collection of holidays fixed by month and day
- std::vector<year_based_generator*> holidays;
- holidays.push_back(new partial_date(1,Jan)); //Western New Year
- holidays.push_back(new partial_date(4,Jul)); //US Independence Day
- holidays.push_back(new partial_date(25, Dec));//Christmas day
- //define a shorthand for the nth_day_of_the_week_in_month function object
- typedef nth_day_of_the_week_in_month nth_dow;
-
- //US labor day
- holidays.push_back(new nth_dow(nth_dow::first, Monday, Sep));
- //MLK Day
- holidays.push_back(new nth_dow(nth_dow::third, Monday, Jan));
- //Pres day
- holidays.push_back(new nth_dow(nth_dow::second, Tuesday, Feb));
- //Thanksgiving
- holidays.push_back(new nth_dow(nth_dow::fourth, Thursday, Nov));
- typedef std::set<date> date_set;
- date_set all_holidays;
-
- for(std::vector<year_based_generator*>::iterator it = holidays.begin();
- it != holidays.end(); ++it)
- {
- all_holidays.insert((*it)->get_date(year));
- }
- //print the holidays to the screen
- std::for_each(all_holidays.begin(), all_holidays.end(), print_date);
- std::cout << "Number Holidays: " << all_holidays.size() << std::endl;
- return 0;
- }
- ]]>
- </programlisting>
- </section>
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