forked from boostorg/iterator
77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
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// Copyright David Abrahams 2004. Use, modification and distribution is
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// subject to the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef NODE_ITERATOR2_DWA2004110_HPP
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# define NODE_ITERATOR2_DWA2004110_HPP
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# include "node.hpp"
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# include <boost/iterator/iterator_facade.hpp>
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# ifndef BOOST_NO_SFINAE
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# include <boost/type_traits/is_convertible.hpp>
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# include <boost/utility/enable_if.hpp>
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# endif
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namespace impl
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{
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template <class Value>
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class node_iterator
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: public boost::iterator_facade<
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node_iterator<Value>
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, Value
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, boost::forward_traversal_tag
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>
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{
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private:
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enum enabler {};
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public:
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node_iterator()
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: m_node(0)
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{}
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explicit node_iterator(Value* p)
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: m_node(p)
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{}
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template <class OtherValue>
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node_iterator(
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node_iterator<OtherValue> const& other
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# ifndef BOOST_NO_SFINAE
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, typename boost::enable_if<boost::is_convertible<OtherValue*,Value*>,enabler*>::type = 0
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# endif
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)
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: m_node(other.m_node)
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{
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}
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friend class boost::iterator_core_access;
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# if !BOOST_WORKAROUND(__GNUC__, == 2)
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private: // GCC2 can't even grant that friendship to template member functions
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# endif
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template <class OtherValue>
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bool equal(node_iterator<OtherValue> const& other) const
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{ return this->m_node == other.m_node; }
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public:
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void increment()
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{ m_node = m_node->next(); }
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Value& dereference() const
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{ return *m_node; }
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# ifdef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
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public:
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# else
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template <class> friend class node_iterator;
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# endif
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Value* m_node;
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};
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}
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typedef impl::node_iterator<node_base> node_iterator;
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typedef impl::node_iterator<node_base const> node_const_iterator;
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#endif // NODE_ITERATOR2_DWA2004110_HPP
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