1 /*-----------------------------------------------------------------------------+
2 Copyright (c) 2010-2010: Joachim Faulhaber
3 +------------------------------------------------------------------------------+
4    Distributed under the Boost Software License, Version 1.0.
5       (See accompanying file LICENCE.txt or copy at
6            http://www.boost.org/LICENSE_1_0.txt)
7 +-----------------------------------------------------------------------------*/
8 #ifndef BOOST_ICL_LEFT_OPEN_INTERVAL_HPP_JOFA_100930
9 #define BOOST_ICL_LEFT_OPEN_INTERVAL_HPP_JOFA_100930
10 
11 #include <functional>
12 #include <boost/concept/assert.hpp>
13 #include <boost/icl/concept/interval.hpp>
14 #include <boost/icl/type_traits/value_size.hpp>
15 #include <boost/icl/type_traits/type_to_string.hpp>
16 
17 namespace boost{namespace icl
18 {
19 
20 template <class DomainT,
21           ICL_COMPARE Compare = ICL_COMPARE_INSTANCE(ICL_COMPARE_DEFAULT, DomainT)>
22 class left_open_interval
23 {
24 public:
25     typedef left_open_interval<DomainT,Compare> type;
26     typedef DomainT domain_type;
27     typedef ICL_COMPARE_DOMAIN(Compare,DomainT) domain_compare;
28 
29 public:
30     //==========================================================================
31     //= Construct, copy, destruct
32     //==========================================================================
33     /** Default constructor; yields an empty interval <tt>(0,0]</tt>. */
left_open_interval()34     left_open_interval()
35         : _lwb(identity_element<DomainT>::value()), _upb(identity_element<DomainT>::value())
36     {
37         BOOST_CONCEPT_ASSERT((DefaultConstructibleConcept<DomainT>));
38         BOOST_CONCEPT_ASSERT((LessThanComparableConcept<DomainT>));
39     }
40 
41     //NOTE: Compiler generated copy constructor is used
42 
43     /** Constructor for a left-open singleton interval <tt>(val-1,val]</tt> */
left_open_interval(const DomainT & val)44     explicit left_open_interval(const DomainT& val)
45         : _lwb(predecessor<DomainT,domain_compare>::apply(val)), _upb(val)
46     {
47         BOOST_CONCEPT_ASSERT((DefaultConstructibleConcept<DomainT>));
48         BOOST_CONCEPT_ASSERT((LessThanComparableConcept<DomainT>));
49         // Only for discrete types this ctor creates an interval containing
50         // a single element only.
51         BOOST_STATIC_ASSERT((icl::is_discrete<DomainT>::value));
52         BOOST_ASSERT((numeric_minimum<DomainT, domain_compare, is_numeric<DomainT>::value >
53                                      ::is_less_than(val) ));
54     }
55 
56     /** Interval from <tt>low</tt> to <tt>up</tt> with bounds <tt>bounds</tt> */
left_open_interval(const DomainT & low,const DomainT & up)57     left_open_interval(const DomainT& low, const DomainT& up) :
58         _lwb(low), _upb(up)
59     {
60         BOOST_CONCEPT_ASSERT((DefaultConstructibleConcept<DomainT>));
61         BOOST_CONCEPT_ASSERT((LessThanComparableConcept<DomainT>));
62     }
63 
lower() const64     DomainT lower()const{ return _lwb; }
upper() const65     DomainT upper()const{ return _upb; }
66 
67 private:
68     DomainT _lwb;
69     DomainT _upb;
70 };
71 
72 //==============================================================================
73 //=T left_open_interval -> concept intervals
74 //==============================================================================
75 template<class DomainT, ICL_COMPARE Compare>
76 struct interval_traits< icl::left_open_interval<DomainT, Compare> >
77 {
78     typedef DomainT domain_type;
79     typedef ICL_COMPARE_DOMAIN(Compare,DomainT) domain_compare;
80     typedef icl::left_open_interval<DomainT, Compare> interval_type;
81 
constructboost::icl::interval_traits82     static interval_type construct(const domain_type& lo, const domain_type& up)
83     {
84         return interval_type(lo, up);
85     }
86 
lowerboost::icl::interval_traits87     static domain_type lower(const interval_type& inter_val){ return inter_val.lower(); };
upperboost::icl::interval_traits88     static domain_type upper(const interval_type& inter_val){ return inter_val.upper(); };
89 };
90 
91 
92 //==============================================================================
93 //= Type traits
94 //==============================================================================
95 template <class DomainT, ICL_COMPARE Compare>
96 struct interval_bound_type< left_open_interval<DomainT,Compare> >
97 {
98     typedef interval_bound_type type;
99     BOOST_STATIC_CONSTANT(bound_type, value = interval_bounds::static_left_open);
100 };
101 
102 template <class DomainT, ICL_COMPARE Compare>
103 struct type_to_string<icl::left_open_interval<DomainT,Compare> >
104 {
applyboost::icl::type_to_string105     static std::string apply()
106     { return "(I]<"+ type_to_string<DomainT>::apply() +">"; }
107 };
108 
109 template<class DomainT, ICL_COMPARE Compare>
110 struct value_size<icl::left_open_interval<DomainT,Compare> >
111 {
applyboost::icl::value_size112     static std::size_t apply(const icl::left_open_interval<DomainT>&)
113     { return 2; }
114 };
115 
116 }} // namespace icl boost
117 
118 #endif
119 
120