147 lines
4.4 KiB
Plaintext
147 lines
4.4 KiB
Plaintext
#ifndef DATE_TIME_DATE_DURATION__
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#define DATE_TIME_DATE_DURATION__
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/* Copyright (c) 2002,2003 CrystalClear Software, Inc.
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* Use, modification and distribution is subject to the
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* Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
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* Author: Jeff Garland, Bart Garst
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* $Date$
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*/
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#include <boost/operators.hpp>
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#include <boost/date_time/special_defs.hpp>
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namespace boost {
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namespace date_time {
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//! Duration type with date level resolution
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template<class duration_rep_traits>
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class date_duration : private
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boost::less_than_comparable1< date_duration< duration_rep_traits >
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, boost::equality_comparable1< date_duration< duration_rep_traits >
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, boost::addable1< date_duration< duration_rep_traits >
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, boost::subtractable1< date_duration< duration_rep_traits >
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, boost::dividable2< date_duration< duration_rep_traits >, int
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> > > > >
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{
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public:
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typedef typename duration_rep_traits::int_type duration_rep_type;
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typedef typename duration_rep_traits::impl_type duration_rep;
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//! Construct from a day count
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explicit date_duration(duration_rep day_count) : days_(day_count) {}
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/*! construct from special_values - only works when
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* instantiated with duration_traits_adapted */
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date_duration(special_values sv) :
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days_(duration_rep::from_special(sv))
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{}
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// copy constructor required for addable<> & subtractable<>
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//! Construct from another date_duration (Copy Constructor)
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date_duration(const date_duration<duration_rep_traits>& other) :
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days_(other.days_)
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{}
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//! returns days_ as it's instantiated type - used for streaming
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duration_rep get_rep()const
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{
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return days_;
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}
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bool is_special()const
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{
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return days_.is_special();
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}
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//! returns days as value, not object.
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duration_rep_type days() const
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{
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return duration_rep_traits::as_number(days_);
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}
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//! Returns the smallest duration -- used by to calculate 'end'
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static date_duration unit()
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{
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return date_duration<duration_rep_traits>(1);
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}
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//! Equality
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bool operator==(const date_duration& rhs) const
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{
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return days_ == rhs.days_;
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}
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//! Less
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bool operator<(const date_duration& rhs) const
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{
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return days_ < rhs.days_;
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}
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/* For shortcut operators (+=, -=, etc) simply using
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* "days_ += days_" may not work. If instantiated with
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* an int_adapter, shortcut operators are not present,
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* so this will not compile */
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//! Subtract another duration -- result is signed
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date_duration& operator-=(const date_duration& rhs)
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{
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//days_ -= rhs.days_;
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days_ = days_ - rhs.days_;
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return *this;
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}
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//! Add a duration -- result is signed
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date_duration& operator+=(const date_duration& rhs)
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{
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days_ = days_ + rhs.days_;
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return *this;
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}
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//! unary- Allows for dd = -date_duration(2); -> dd == -2
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date_duration operator-() const
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{
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return date_duration<duration_rep_traits>(get_rep() * (-1));
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}
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//! Division operations on a duration with an integer.
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date_duration& operator/=(int divisor)
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{
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days_ = days_ / divisor;
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return *this;
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}
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//! return sign information
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bool is_negative() const
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{
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return days_ < 0;
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}
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private:
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duration_rep days_;
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};
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/*! Struct for instantiating date_duration with <b>NO</b> special values
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* functionality. Allows for transparent implementation of either
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* date_duration<long> or date_duration<int_adapter<long> > */
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struct duration_traits_long
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{
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typedef long int_type;
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typedef long impl_type;
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static int_type as_number(impl_type i) { return i; }
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};
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/*! Struct for instantiating date_duration <b>WITH</b> special values
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* functionality. Allows for transparent implementation of either
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* date_duration<long> or date_duration<int_adapter<long> > */
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struct duration_traits_adapted
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{
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typedef long int_type;
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typedef boost::date_time::int_adapter<long> impl_type;
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static int_type as_number(impl_type i) { return i.as_number(); }
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};
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} } //namspace date_time
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#endif
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