140 lines
3.8 KiB
C++
140 lines
3.8 KiB
C++
// (C) Copyright David Abrahams 2002.
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// (C) Copyright Jeremy Siek 2002.
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// (C) Copyright Thomas Witt 2002.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_INDIRECT_ITERATOR_23022003THW_HPP
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#define BOOST_INDIRECT_ITERATOR_23022003THW_HPP
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#include <boost/iterator.hpp>
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#include <boost/iterator/iterator_adaptor.hpp>
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#include <boost/pointee.hpp>
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#include <boost/indirect_reference.hpp>
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#include <boost/detail/iterator.hpp>
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#include <boost/detail/indirect_traits.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/type_traits/add_reference.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/not.hpp>
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#include <boost/mpl/has_xxx.hpp>
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#ifdef BOOST_MPL_CFG_NO_HAS_XXX
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# include <boost/shared_ptr.hpp>
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# include <boost/scoped_ptr.hpp>
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# include <boost/mpl/bool.hpp>
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# include <memory>
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#endif
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#include <boost/iterator/detail/config_def.hpp> // must be last #include
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namespace boost
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{
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template <class Iter, class Value, class Category, class Reference, class Difference>
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class indirect_iterator;
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namespace detail
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{
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template <class Iter, class Value, class Category, class Reference, class Difference>
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struct indirect_base
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{
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typedef typename iterator_traits<Iter>::value_type dereferenceable;
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typedef iterator_adaptor<
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indirect_iterator<Iter, Value, Category, Reference, Difference>
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, Iter
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, typename ia_dflt_help<
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Value, pointee<dereferenceable>
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>::type
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, Category
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, typename ia_dflt_help<
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Reference
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, mpl::eval_if<
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is_same<Value,use_default>
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, indirect_reference<dereferenceable>
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, add_reference<Value>
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>
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>::type
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, Difference
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> type;
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};
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template <>
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struct indirect_base<int, int, int, int, int> {};
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} // namespace detail
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template <
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class Iterator
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, class Value = use_default
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, class Category = use_default
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, class Reference = use_default
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, class Difference = use_default
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>
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class indirect_iterator
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: public detail::indirect_base<
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Iterator, Value, Category, Reference, Difference
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>::type
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{
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typedef typename detail::indirect_base<
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Iterator, Value, Category, Reference, Difference
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>::type super_t;
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friend class iterator_core_access;
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public:
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indirect_iterator() {}
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indirect_iterator(Iterator iter)
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: super_t(iter) {}
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template <
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class Iterator2, class Value2, class Category2
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, class Reference2, class Difference2
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>
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indirect_iterator(
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indirect_iterator<
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Iterator2, Value2, Category2, Reference2, Difference2
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> const& y
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, typename enable_if_convertible<Iterator2, Iterator>::type* = 0
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)
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: super_t(y.base())
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{}
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private:
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typename super_t::reference dereference() const
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{
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# if BOOST_WORKAROUND(__BORLANDC__, < 0x5A0 )
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return const_cast<super_t::reference>(**this->base());
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# else
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return **this->base();
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# endif
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}
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};
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template <class Iter>
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inline
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indirect_iterator<Iter> make_indirect_iterator(Iter x)
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{
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return indirect_iterator<Iter>(x);
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}
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template <class Traits, class Iter>
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inline
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indirect_iterator<Iter,Traits> make_indirect_iterator(Iter x, Traits* = 0)
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{
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return indirect_iterator<Iter, Traits>(x);
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}
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} // namespace boost
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#include <boost/iterator/detail/config_undef.hpp>
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#endif // BOOST_INDIRECT_ITERATOR_23022003THW_HPP
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