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indirect_iterator.hpp
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// (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/iterator_adaptor.hpp> #include <boost/pointee.hpp> #include <boost/indirect_reference.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> #include <iterator> #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 { namespace iterators { 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 std::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(BOOST_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 iterators using iterators::indirect_iterator; using iterators::make_indirect_iterator; } // namespace boost #include <boost/iterator/detail/config_undef.hpp> #endif // BOOST_INDIRECT_ITERATOR_23022003THW_HPP