[3428] | 1 | #ifndef DATE_TIME_DATE_DURATION__ |
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| 2 | #define DATE_TIME_DATE_DURATION__ |
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| 3 | |
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| 4 | /* Copyright (c) 2002,2003 CrystalClear Software, Inc. |
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| 5 | * Use, modification and distribution is subject to the |
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| 6 | * Boost Software License, Version 1.0. (See accompanying |
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| 7 | * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) |
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| 8 | * Author: Jeff Garland, Bart Garst |
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| 9 | * $Date: 2008-11-12 14:37:53 -0500 (Wed, 12 Nov 2008) $ |
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| 10 | */ |
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| 11 | |
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| 12 | |
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| 13 | #include <boost/operators.hpp> |
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| 14 | #include <boost/date_time/special_defs.hpp> |
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| 15 | |
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| 16 | namespace boost { |
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| 17 | namespace date_time { |
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| 18 | |
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| 19 | |
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| 20 | //! Duration type with date level resolution |
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| 21 | template<class duration_rep_traits> |
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| 22 | class date_duration : private |
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| 23 | boost::less_than_comparable1< date_duration< duration_rep_traits > |
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| 24 | , boost::equality_comparable1< date_duration< duration_rep_traits > |
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| 25 | , boost::addable1< date_duration< duration_rep_traits > |
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| 26 | , boost::subtractable1< date_duration< duration_rep_traits > |
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| 27 | , boost::dividable2< date_duration< duration_rep_traits >, int |
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| 28 | > > > > > |
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| 29 | { |
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| 30 | public: |
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| 31 | typedef typename duration_rep_traits::int_type duration_rep_type; |
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| 32 | typedef typename duration_rep_traits::impl_type duration_rep; |
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| 33 | |
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| 34 | //! Construct from a day count |
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| 35 | explicit date_duration(duration_rep day_count) : days_(day_count) {}; |
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| 36 | |
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| 37 | /*! construct from special_values - only works when |
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| 38 | * instantiated with duration_traits_adapted */ |
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| 39 | date_duration(special_values sv) : |
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| 40 | days_(duration_rep::from_special(sv)) |
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| 41 | {} |
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| 42 | |
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| 43 | // copy constructor required for addable<> & subtractable<> |
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| 44 | //! Construct from another date_duration (Copy Constructor) |
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| 45 | date_duration(const date_duration<duration_rep_traits>& other) : |
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| 46 | days_(other.days_) |
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| 47 | {} |
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| 48 | |
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| 49 | //! returns days_ as it's instantiated type - used for streaming |
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| 50 | duration_rep get_rep()const |
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| 51 | { |
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| 52 | return days_; |
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| 53 | } |
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| 54 | bool is_special()const |
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| 55 | { |
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| 56 | return days_.is_special(); |
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| 57 | } |
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| 58 | //! returns days as value, not object. |
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| 59 | duration_rep_type days() const |
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| 60 | { |
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| 61 | return duration_rep_traits::as_number(days_); |
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| 62 | } |
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| 63 | //! Returns the smallest duration -- used by to calculate 'end' |
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| 64 | static date_duration unit() |
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| 65 | { |
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| 66 | return date_duration<duration_rep_traits>(1); |
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| 67 | } |
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| 68 | //! Equality |
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| 69 | bool operator==(const date_duration& rhs) const |
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| 70 | { |
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| 71 | return days_ == rhs.days_; |
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| 72 | } |
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| 73 | //! Less |
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| 74 | bool operator<(const date_duration& rhs) const |
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| 75 | { |
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| 76 | return days_ < rhs.days_; |
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| 77 | } |
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| 78 | |
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| 79 | /* For shortcut operators (+=, -=, etc) simply using |
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| 80 | * "days_ += days_" may not work. If instantiated with |
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| 81 | * an int_adapter, shortcut operators are not present, |
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| 82 | * so this will not compile */ |
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| 83 | |
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| 84 | //! Subtract another duration -- result is signed |
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| 85 | date_duration& operator-=(const date_duration& rhs) |
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| 86 | { |
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| 87 | //days_ -= rhs.days_; |
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| 88 | days_ = days_ - rhs.days_; |
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| 89 | return *this; |
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| 90 | } |
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| 91 | //! Add a duration -- result is signed |
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| 92 | date_duration& operator+=(const date_duration& rhs) |
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| 93 | { |
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| 94 | days_ = days_ + rhs.days_; |
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| 95 | return *this; |
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| 96 | } |
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| 97 | |
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| 98 | //! unary- Allows for dd = -date_duration(2); -> dd == -2 |
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| 99 | date_duration operator-() const |
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| 100 | { |
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| 101 | return date_duration<duration_rep_traits>(get_rep() * (-1)); |
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| 102 | } |
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| 103 | //! Division operations on a duration with an integer. |
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| 104 | date_duration& operator/=(int divisor) |
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| 105 | { |
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| 106 | days_ = days_ / divisor; |
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| 107 | return *this; |
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| 108 | } |
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| 109 | |
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| 110 | //! return sign information |
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| 111 | bool is_negative() const |
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| 112 | { |
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| 113 | return days_ < 0; |
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| 114 | } |
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| 115 | |
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| 116 | private: |
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| 117 | duration_rep days_; |
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| 118 | }; |
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| 119 | |
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| 120 | |
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| 121 | /*! Struct for instantiating date_duration with <b>NO</b> special values |
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| 122 | * functionality. Allows for transparent implementation of either |
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| 123 | * date_duration<long> or date_duration<int_adapter<long> > */ |
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| 124 | struct duration_traits_long |
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| 125 | { |
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| 126 | typedef long int_type; |
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| 127 | typedef long impl_type; |
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| 128 | static int_type as_number(impl_type i) { return i; }; |
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| 129 | }; |
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| 130 | |
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| 131 | /*! Struct for instantiating date_duration <b>WITH</b> special values |
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| 132 | * functionality. Allows for transparent implementation of either |
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| 133 | * date_duration<long> or date_duration<int_adapter<long> > */ |
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| 134 | struct duration_traits_adapted |
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| 135 | { |
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| 136 | typedef long int_type; |
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| 137 | typedef boost::date_time::int_adapter<long> impl_type; |
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| 138 | static int_type as_number(impl_type i) { return i.as_number(); }; |
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| 139 | }; |
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| 140 | |
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| 141 | |
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| 142 | } } //namspace date_time |
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| 143 | |
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| 144 | |
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| 145 | #endif |
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| 146 | |
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