| // 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 |