epoc32/include/stdapis/boost/iterator/indirect_iterator.hpp
author William Roberts <williamr@symbian.org>
Wed, 31 Mar 2010 12:33:34 +0100
branchSymbian3
changeset 4 837f303aceeb
permissions -rw-r--r--
Current Symbian^3 public API header files (from PDK 3.0.h)
This is the epoc32/include tree with the "platform" subtrees removed, and
all but a selected few mbg and rsg files removed.
     1 // (C) Copyright David Abrahams 2002.
     2 // (C) Copyright Jeremy Siek    2002.
     3 // (C) Copyright Thomas Witt    2002.
     4 // Distributed under the Boost Software License, Version 1.0. (See
     5 // accompanying file LICENSE_1_0.txt or copy at
     6 // http://www.boost.org/LICENSE_1_0.txt)
     7 #ifndef BOOST_INDIRECT_ITERATOR_23022003THW_HPP
     8 #define BOOST_INDIRECT_ITERATOR_23022003THW_HPP
     9 
    10 #include <boost/iterator.hpp>
    11 #include <boost/iterator/iterator_adaptor.hpp>
    12 
    13 #include <boost/pointee.hpp>
    14 #include <boost/indirect_reference.hpp>
    15 #include <boost/detail/iterator.hpp>
    16 
    17 #include <boost/detail/indirect_traits.hpp>
    18 
    19 #include <boost/type_traits/is_same.hpp>
    20 #include <boost/type_traits/add_reference.hpp>
    21 
    22 #include <boost/mpl/bool.hpp>
    23 #include <boost/mpl/identity.hpp>
    24 #include <boost/mpl/eval_if.hpp>
    25 #include <boost/mpl/not.hpp>
    26 #include <boost/mpl/has_xxx.hpp>
    27 
    28 #ifdef BOOST_MPL_CFG_NO_HAS_XXX
    29 # include <boost/shared_ptr.hpp>
    30 # include <boost/scoped_ptr.hpp>
    31 # include <boost/mpl/bool.hpp>
    32 # include <memory>
    33 #endif 
    34 
    35 #include <boost/iterator/detail/config_def.hpp> // must be last #include
    36 
    37 namespace boost
    38 {
    39   template <class Iter, class Value, class Category, class Reference, class Difference>
    40   class indirect_iterator;
    41 
    42   namespace detail
    43   {
    44     template <class Iter, class Value, class Category, class Reference, class Difference>
    45     struct indirect_base
    46     {
    47         typedef typename iterator_traits<Iter>::value_type dereferenceable;
    48         
    49         typedef iterator_adaptor<
    50             indirect_iterator<Iter, Value, Category, Reference, Difference>
    51           , Iter
    52           , typename ia_dflt_help<
    53                 Value, pointee<dereferenceable>
    54             >::type
    55           , Category
    56           , typename ia_dflt_help<
    57                 Reference
    58               , mpl::eval_if<
    59                     is_same<Value,use_default>
    60                   , indirect_reference<dereferenceable>
    61                   , add_reference<Value>
    62                 >
    63             >::type
    64           , Difference
    65         > type;
    66     };
    67 
    68     template <>
    69     struct indirect_base<int, int, int, int, int> {};
    70   } // namespace detail
    71 
    72     
    73   template <
    74       class Iterator
    75     , class Value = use_default
    76     , class Category = use_default
    77     , class Reference = use_default
    78     , class Difference = use_default
    79   >
    80   class indirect_iterator
    81     : public detail::indirect_base<
    82         Iterator, Value, Category, Reference, Difference
    83       >::type
    84   {
    85       typedef typename detail::indirect_base<
    86           Iterator, Value, Category, Reference, Difference
    87       >::type super_t;
    88 
    89       friend class iterator_core_access;
    90 
    91    public:
    92       indirect_iterator() {}
    93 
    94       indirect_iterator(Iterator iter)
    95         : super_t(iter) {}
    96 
    97       template <
    98           class Iterator2, class Value2, class Category2
    99         , class Reference2, class Difference2
   100       >
   101       indirect_iterator(
   102           indirect_iterator<
   103                Iterator2, Value2, Category2, Reference2, Difference2
   104           > const& y
   105         , typename enable_if_convertible<Iterator2, Iterator>::type* = 0
   106       )
   107         : super_t(y.base())
   108       {}
   109 
   110   private:    
   111       typename super_t::reference dereference() const
   112       {
   113 # if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
   114           return const_cast<super_t::reference>(**this->base());
   115 # else
   116           return **this->base();
   117 # endif 
   118       }
   119   };
   120 
   121   template <class Iter>
   122   inline
   123   indirect_iterator<Iter> make_indirect_iterator(Iter x)
   124   {
   125     return indirect_iterator<Iter>(x);
   126   }
   127 
   128   template <class Traits, class Iter>
   129   inline
   130   indirect_iterator<Iter,Traits> make_indirect_iterator(Iter x, Traits* = 0)
   131   {
   132     return indirect_iterator<Iter, Traits>(x);
   133   }
   134 
   135 } // namespace boost
   136 
   137 #include <boost/iterator/detail/config_undef.hpp>
   138 
   139 #endif // BOOST_INDIRECT_ITERATOR_23022003THW_HPP