// (C) Copyright David Abrahams 2002.

// (C) Copyright Jeremy Siek    2002.

// (C) Copyright Thomas Witt    2002.

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

#ifndef BOOST_INDIRECT_ITERATOR_23022003THW_HPP

#define BOOST_INDIRECT_ITERATOR_23022003THW_HPP

#include <boost/iterator.hpp>

#include <boost/iterator/iterator_adaptor.hpp>

#include <boost/pointee.hpp>

#include <boost/indirect_reference.hpp>

#include <boost/detail/iterator.hpp>

#include <boost/detail/indirect_traits.hpp>

#include <boost/type_traits/is_same.hpp>

#include <boost/type_traits/add_reference.hpp>

#include <boost/mpl/bool.hpp>

#include <boost/mpl/identity.hpp>

#include <boost/mpl/eval_if.hpp>

#include <boost/mpl/not.hpp>

#include <boost/mpl/has_xxx.hpp>

#ifdef BOOST_MPL_CFG_NO_HAS_XXX

# include <boost/shared_ptr.hpp>

# include <boost/scoped_ptr.hpp>

# include <boost/mpl/bool.hpp>

# include <memory>

#endif 

#include <boost/iterator/detail/config_def.hpp> // must be last #include

namespace boost

{

  template <class Iter, class Value, class Category, class Reference, class Difference>

  class indirect_iterator;

  namespace detail

  {

    template <class Iter, class Value, class Category, class Reference, class Difference>

    struct indirect_base

    {

        typedef typename iterator_traits<Iter>::value_type dereferenceable;

        typedef iterator_adaptor<

            indirect_iterator<Iter, Value, Category, Reference, Difference>

          , Iter

          , typename ia_dflt_help<

                Value, pointee<dereferenceable>

            >::type

          , Category

          , typename ia_dflt_help<

                Reference

              , mpl::eval_if<

                    is_same<Value,use_default>

                  , indirect_reference<dereferenceable>

                  , add_reference<Value>

                >

            >::type

          , Difference

        > type;

    };

    template <>

    struct indirect_base<int, int, int, int, int> {};

  } // namespace detail

  template <

      class Iterator

    , class Value = use_default

    , class Category = use_default

    , class Reference = use_default

    , class Difference = use_default

  >

  class indirect_iterator

    : public detail::indirect_base<

        Iterator, Value, Category, Reference, Difference

      >::type

  {

      typedef typename detail::indirect_base<

          Iterator, Value, Category, Reference, Difference

      >::type super_t;

      friend class iterator_core_access;

   public:

      indirect_iterator() {}

      indirect_iterator(Iterator iter)

        : super_t(iter) {}

      template <

          class Iterator2, class Value2, class Category2

        , class Reference2, class Difference2

      >

      indirect_iterator(

          indirect_iterator<

               Iterator2, Value2, Category2, Reference2, Difference2

          > const& y

        , typename enable_if_convertible<Iterator2, Iterator>::type* = 0

      )

        : super_t(y.base())

      {}

  private:    

      typename super_t::reference dereference() const

      {

# if BOOST_WORKAROUND(__BORLANDC__, < 0x5A0 )

          return const_cast<super_t::reference>(**this->base());

# else

          return **this->base();

# endif 

      }

  };

  template <class Iter>

  inline

  indirect_iterator<Iter> make_indirect_iterator(Iter x)

  {

    return indirect_iterator<Iter>(x);

  }

  template <class Traits, class Iter>

  inline

  indirect_iterator<Iter,Traits> make_indirect_iterator(Iter x, Traits* = 0)

  {

    return indirect_iterator<Iter, Traits>(x);

  }

} // namespace boost

#include <boost/iterator/detail/config_undef.hpp>

#endif // BOOST_INDIRECT_ITERATOR_23022003THW_HPP