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74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
// 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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template <class Value>
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class node_iter
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: public boost::iterator_facade<
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node_iter<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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struct enabler {}; // a private type avoids misuse
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public:
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node_iter()
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: m_node(0) {}
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explicit node_iter(Value* p)
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: m_node(p) {}
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template <class OtherValue>
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node_iter(
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node_iter<OtherValue> const& other
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# ifndef BOOST_NO_SFINAE
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, typename boost::enable_if<
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boost::is_convertible<OtherValue*,Value*>
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, enabler
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>::type = enabler()
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# endif
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)
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: m_node(other.m_node) {}
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# if !BOOST_WORKAROUND(__GNUC__, == 2)
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private: // GCC2 can't grant friendship to template member functions
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friend class boost::iterator_core_access;
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# endif
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template <class OtherValue>
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bool equal(node_iter<OtherValue> const& other) const
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{
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return this->m_node == other.m_node;
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}
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void increment() { m_node = m_node->next(); }
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Value& dereference() const { 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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private:
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template <class> friend class node_iter;
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# endif
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Value* m_node;
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};
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typedef node_iter<node_base> node_iterator;
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typedef node_iter<node_base const> node_const_iterator;
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#endif // NODE_ITERATOR2_DWA2004110_HPP
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