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61 lines
1.7 KiB
C++
61 lines
1.7 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_ITERATOR3_DWA2004110_HPP
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# define NODE_ITERATOR3_DWA2004110_HPP
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# include "node.hpp"
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# include <boost/iterator/iterator_adaptor.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_adaptor<
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node_iter<Value> // Derived
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, Value* // Base
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, boost::use_default // Value
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, boost::forward_traversal_tag // CategoryOrTraversal
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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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typedef boost::iterator_adaptor<
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node_iter<Value>, Value*, boost::use_default, boost::forward_traversal_tag
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> super_t;
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public:
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node_iter()
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: super_t(0) {}
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explicit node_iter(Value* p)
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: super_t(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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: super_t(other.base()) {}
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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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void increment() { this->base_reference() = this->base()->next(); }
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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_ITERATOR3_DWA2004110_HPP
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