boost/icl/left_open_interval.hpp

0001 /*-----------------------------------------------------------------------------+
0002 Copyright (c) 2010-2010: Joachim Faulhaber
0003 +------------------------------------------------------------------------------+
0004    Distributed under the Boost Software License, Version 1.0.
0005       (See accompanying file LICENCE.txt or copy at
0006            http://www.boost.org/LICENSE_1_0.txt)
0007 +-----------------------------------------------------------------------------*/
0008 #ifndef BOOST_ICL_LEFT_OPEN_INTERVAL_HPP_JOFA_100930
0009 #define BOOST_ICL_LEFT_OPEN_INTERVAL_HPP_JOFA_100930
0010
0011 #include <functional>
0012 #include <boost/static_assert.hpp>
0013 #include <boost/concept/assert.hpp>
0014 #include <boost/icl/detail/concept_check.hpp>
0015 #include <boost/icl/concept/interval.hpp>
0016 #include <boost/icl/type_traits/succ_pred.hpp>
0017 #include <boost/icl/type_traits/value_size.hpp>
0018 #include <boost/icl/type_traits/type_to_string.hpp>
0019
0020 namespace boost{namespace icl
0021 {
0022
0023 template <class DomainT,
0024           ICL_COMPARE Compare = ICL_COMPARE_INSTANCE(ICL_COMPARE_DEFAULT, DomainT)>
0025 class left_open_interval
0026 {
0027 public:
0028     typedef left_open_interval<DomainT,Compare> type;
0029     typedef DomainT domain_type;
0030     typedef ICL_COMPARE_DOMAIN(Compare,DomainT) domain_compare;
0031
0032 public:
0033     //==========================================================================
0034     //= Construct, copy, destruct
0035     //==========================================================================
0036     /** Default constructor; yields an empty interval <tt>(0,0]</tt>. */
0037     left_open_interval()
0038         : _lwb(identity_element<DomainT>::value()), _upb(identity_element<DomainT>::value())
0039     {
0040         BOOST_CONCEPT_ASSERT((DefaultConstructibleConcept<DomainT>));
0041         BOOST_CONCEPT_ASSERT((LessThanComparableConcept<DomainT>));
0042     }
0043
0044     //NOTE: Compiler generated copy constructor is used
0045
0046     /** Constructor for a left-open singleton interval <tt>(val-1,val]</tt> */
0047     explicit left_open_interval(const DomainT& val)
0048         : _lwb(predecessor<DomainT,domain_compare>::apply(val)), _upb(val)
0049     {
0050         BOOST_CONCEPT_ASSERT((DefaultConstructibleConcept<DomainT>));
0051         BOOST_CONCEPT_ASSERT((LessThanComparableConcept<DomainT>));
0052         // Only for discrete types this ctor creates an interval containing
0053         // a single element only.
0054         BOOST_STATIC_ASSERT((icl::is_discrete<DomainT>::value));
0055         BOOST_ASSERT((numeric_minimum<DomainT, domain_compare, is_numeric<DomainT>::value >
0056                                      ::is_less_than(val) ));
0057     }
0058
0059     /** Interval from <tt>low</tt> to <tt>up</tt> with bounds <tt>bounds</tt> */
0060     left_open_interval(const DomainT& low, const DomainT& up) :
0061         _lwb(low), _upb(up)
0062     {
0063         BOOST_CONCEPT_ASSERT((DefaultConstructibleConcept<DomainT>));
0064         BOOST_CONCEPT_ASSERT((LessThanComparableConcept<DomainT>));
0065     }
0066
0067     DomainT lower()const{ return _lwb; }
0068     DomainT upper()const{ return _upb; }
0069
0070 private:
0071     DomainT _lwb;
0072     DomainT _upb;
0073 };
0074
0075 //==============================================================================
0076 //=T left_open_interval -> concept intervals
0077 //==============================================================================
0078 template<class DomainT, ICL_COMPARE Compare>
0079 struct interval_traits< icl::left_open_interval<DomainT, Compare> >
0080 {
0081     typedef DomainT domain_type;
0082     typedef ICL_COMPARE_DOMAIN(Compare,DomainT) domain_compare;
0083     typedef icl::left_open_interval<DomainT, Compare> interval_type;
0084
0085     static interval_type construct(const domain_type& lo, const domain_type& up)
0086     {
0087         return interval_type(lo, up);
0088     }
0089
0090     static domain_type lower(const interval_type& inter_val){ return inter_val.lower(); }
0091     static domain_type upper(const interval_type& inter_val){ return inter_val.upper(); }
0092 };
0093
0094
0095 //==============================================================================
0096 //= Type traits
0097 //==============================================================================
0098 template <class DomainT, ICL_COMPARE Compare>
0099 struct interval_bound_type< left_open_interval<DomainT,Compare> >
0100 {
0101     typedef interval_bound_type type;
0102     BOOST_STATIC_CONSTANT(bound_type, value = interval_bounds::static_left_open);
0103 };
0104
0105 template <class DomainT, ICL_COMPARE Compare>
0106 struct type_to_string<icl::left_open_interval<DomainT,Compare> >
0107 {
0108     static std::string apply()
0109     { return "(I]<"+ type_to_string<DomainT>::apply() +">"; }
0110 };
0111
0112 template<class DomainT, ICL_COMPARE Compare>
0113 struct value_size<icl::left_open_interval<DomainT,Compare> >
0114 {
0115     static std::size_t apply(const icl::left_open_interval<DomainT>&)
0116     { return 2; }
0117 };
0118
0119 }} // namespace icl boost
0120
0121 #endif