https://svn.boost.org/trac10/ticket/5888 <p> On this documentation page, second box: <a href="http://www.boost.org/doc/libs/1_47_0/libs/iterator/doc/iterator_facade.html#a-constant-node-iterator">http://www.boost.org/doc/libs/1_47_0/libs/iterator/doc/iterator_facade.html#a-constant-node-iterator</a> there is a problem with const-correctness on the dereference function. </p> <p> For the const_node_iterator, Value = const node_base, thus yielding </p> <pre class="wiki">const node_base&amp; dereference() const { return *m_node; } const node_base* m_node; </pre><p> However, for node_iterator, Value = node_base: </p> <pre class="wiki">node_base&amp; dereference() const { return *m_node; // Error: cannot convert const variable to non_const reference } node_iterator* m_node; </pre><p> Correct would be to const-overload dereference: </p> <pre class="wiki">typedef boost::iterator_facade&lt; node_iter&lt;Value&gt; , Value , boost::forward_traversal_tag &gt; super; typename super::reference dereference() { return *m_node; } const typename super::reference dereference() const { return *m_node; } </pre> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/5888 Trac 1.4.3 anonymous Mon, 10 Oct 2011 23:36:12 GMT https://svn.boost.org/trac10/ticket/5888#comment:2 https://svn.boost.org/trac10/ticket/5888#comment:2 <ul> <li><strong>owner</strong> changed from <span class="trac-author">Dave Abrahams</span> to <span class="trac-author">jeffrey.hellrung</span> </li> </ul> Ticket