ceph/src/boost/boost/icl/open_interval.hpp

   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_OPEN_INTERVAL_HPP_JOFA_100930
   9 #define BOOST_ICL_OPEN_INTERVAL_HPP_JOFA_100930
  10
  11 #include <functional>
  12 #include <boost/concept/assert.hpp>
  13 #include <boost/icl/detail/concept_check.hpp>
  14 #include <boost/icl/concept/interval.hpp>
  15 #include <boost/icl/type_traits/value_size.hpp>
  16 #include <boost/icl/type_traits/type_to_string.hpp>
  17
  18 namespace boost{namespace icl
  19 {
  20
  21 template <class DomainT,
  22           ICL_COMPARE Compare = ICL_COMPARE_INSTANCE(ICL_COMPARE_DEFAULT, DomainT)>
  23 class open_interval
  24 {
  25 public:
  26     typedef open_interval<DomainT,Compare> type;
  27     typedef DomainT domain_type;
  28     typedef ICL_COMPARE_DOMAIN(Compare,DomainT) domain_compare;
  29
  30 public:
  31     //==========================================================================
  32     //= Construct, copy, destruct
  33     //==========================================================================
  34     /** Default constructor; yields an empty interval <tt>(0,0)</tt>. */
  35     open_interval()
  36         : _lwb(identity_element<DomainT>::value()), _upb(identity_element<DomainT>::value())
  37     {
  38         BOOST_CONCEPT_ASSERT((DefaultConstructibleConcept<DomainT>));
  39         BOOST_CONCEPT_ASSERT((LessThanComparableConcept<DomainT>));
  40     }
  41
  42     //NOTE: Compiler generated copy constructor is used
  43
  44     /** Constructor for an open singleton interval <tt>(val-1,val+1)</tt> */
  45     explicit open_interval(const DomainT& val)
  46         : _lwb(pred(val)), _upb(succ(val))
  47     {
  48         BOOST_CONCEPT_ASSERT((DefaultConstructibleConcept<DomainT>));
  49         BOOST_CONCEPT_ASSERT((LessThanComparableConcept<DomainT>));
  50         // Only for discrete types this ctor creates an interval containing
  51         // a single element only.
  52         BOOST_STATIC_ASSERT((icl::is_discrete<DomainT>::value));
  53         BOOST_ASSERT((numeric_minimum<DomainT, domain_compare, is_numeric<DomainT>::value >
  54                                      ::is_less_than(val) ));
  55     }
  56
  57     /** Interval from <tt>low</tt> to <tt>up</tt> with bounds <tt>bounds</tt> */
  58     open_interval(const DomainT& low, const DomainT& up) :
  59         _lwb(low), _upb(up)
  60     {
  61         BOOST_CONCEPT_ASSERT((DefaultConstructibleConcept<DomainT>));
  62         BOOST_CONCEPT_ASSERT((LessThanComparableConcept<DomainT>));
  63     }
  64
  65     DomainT lower()const{ return _lwb; }
  66     DomainT upper()const{ return _upb; }
  67
  68 private:
  69     DomainT _lwb;
  70     DomainT _upb;
  71 };
  72
  73 //==============================================================================
  74 //=T open_interval -> concept intervals
  75 //==============================================================================
  76 template<class DomainT, ICL_COMPARE Compare>
  77 struct interval_traits< icl::open_interval<DomainT, Compare> >
  78 {
  79     typedef DomainT domain_type;
  80     typedef ICL_COMPARE_DOMAIN(Compare,DomainT) domain_compare;
  81     typedef icl::open_interval<DomainT, Compare> interval_type;
  82
  83     static interval_type construct(const domain_type& lo, const domain_type& up)
  84     {
  85         return interval_type(lo, up);
  86     }
  87
  88     static domain_type lower(const interval_type& inter_val){ return inter_val.lower(); };
  89     static domain_type upper(const interval_type& inter_val){ return inter_val.upper(); };
  90 };
  91
  92
  93 //==============================================================================
  94 //= Type traits
  95 //==============================================================================
  96 template <class DomainT, ICL_COMPARE Compare>
  97 struct interval_bound_type< open_interval<DomainT,Compare> >
  98 {
  99     typedef interval_bound_type type;
 100     BOOST_STATIC_CONSTANT(bound_type, value = interval_bounds::static_open);
 101 };
 102
 103 template <class DomainT, ICL_COMPARE Compare>
 104 struct type_to_string<icl::open_interval<DomainT,Compare> >
 105 {
 106     static std::string apply()
 107     { return "(I)<"+ type_to_string<DomainT>::apply() +">"; }
 108 };
 109
 110 template<class DomainT, ICL_COMPARE Compare>
 111 struct value_size<icl::open_interval<DomainT,Compare> >
 112 {
 113     static std::size_t apply(const icl::open_interval<DomainT>&)
 114     { return 2; }
 115 };
 116
 117 }} // namespace icl boost
 118
 119 #endif
 120