ceph/src/boost/boost/icl/left_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_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>. */
  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> */
  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> */
  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
  64     DomainT lower()const{ return _lwb; }
  65     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
  82     static interval_type construct(const domain_type& lo, const domain_type& up)
  83     {
  84         return interval_type(lo, up);
  85     }
  86
  87     static domain_type lower(const interval_type& inter_val){ return inter_val.lower(); };
  88     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 {
 105     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 {
 112     static std::size_t apply(const icl::left_open_interval<DomainT>&)
 113     { return 2; }
 114 };
 115
 116 }} // namespace icl boost
 117
 118 #endif
 119