// Copyright David Abrahams 2004. Use, modification and distribution is // subject to 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 NODE_ITERATOR3_DWA2004110_HPP # define NODE_ITERATOR3_DWA2004110_HPP # include "node.hpp" # include <boost/iterator/iterator_adaptor.hpp> # ifndef BOOST_NO_SFINAE # include <boost/type_traits/is_convertible.hpp> # include <boost/utility/enable_if.hpp> # endif template <class Value> class node_iter : public boost::iterator_adaptor< node_iter<Value> // Derived , Value* // Base , boost::use_default // Value , boost::forward_traversal_tag // CategoryOrTraversal > { private: struct enabler {}; // a private type avoids misuse typedef boost::iterator_adaptor< node_iter<Value>, Value*, boost::use_default, boost::forward_traversal_tag > super_t; public: node_iter() : super_t(0) {} explicit node_iter(Value* p) : super_t(p) {} template <class OtherValue> node_iter( node_iter<OtherValue> const& other # ifndef BOOST_NO_SFINAE , typename boost::enable_if< boost::is_convertible<OtherValue*,Value*> , enabler >::type = enabler() # endif ) : super_t(other.base()) {} # if !BOOST_WORKAROUND(__GNUC__, == 2) private: // GCC2 can't grant friendship to template member functions friend class boost::iterator_core_access; # endif void increment() { this->base_reference() = this->base()->next(); } }; typedef node_iter<node_base> node_iterator; typedef node_iter<node_base const> node_const_iterator; #endif // NODE_ITERATOR3_DWA2004110_HPP