Began tutorial and examples.

[SVN r21584]

example/node_iterator2.hpp

@@ -0,0 +1,76 @@
+// 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_ITERATOR2_DWA2004110_HPP
+# define NODE_ITERATOR2_DWA2004110_HPP
+
+# include "node.hpp"
+# include <boost/iterator/iterator_facade.hpp>
+
+# ifndef BOOST_NO_SFINAE
+#  include <boost/type_traits/is_convertible.hpp>
+#  include <boost/utility/enable_if.hpp>
+# endif
+
+namespace impl
+{
+  template <class Value>
+  class node_iterator
+    : public boost::iterator_facade<
+          node_iterator<Value>
+        , Value
+        , boost::forward_traversal_tag
+      >
+  {
+   private:
+      enum enabler {};
+      
+   public:
+      node_iterator()
+        : m_node(0)
+      {}
+
+      explicit node_iterator(Value* p)
+        : m_node(p)
+      {}
+
+      template <class OtherValue>
+      node_iterator(
+          node_iterator<OtherValue> const& other
+# ifndef BOOST_NO_SFINAE
+        , typename boost::enable_if<boost::is_convertible<OtherValue*,Value*>,enabler*>::type = 0
+# endif 
+      )
+        : m_node(other.m_node)
+      {
+      }
+        
+
+      friend class boost::iterator_core_access;
+# if !BOOST_WORKAROUND(__GNUC__, == 2)
+   private: // GCC2 can't even grant that friendship to template member functions
+# endif 
+      template <class OtherValue>
+      bool equal(node_iterator<OtherValue> const& other) const
+      { return this->m_node == other.m_node; }
+    
+   public:
+      void increment()
+      { m_node = m_node->next(); }
+
+      Value& dereference() const
+      { return *m_node; }
+
+# ifdef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
+   public:
+# else 
+      template <class> friend class node_iterator;
+# endif 
+      Value* m_node;
+  };
+}
+
+typedef impl::node_iterator<node_base> node_iterator;
+typedef impl::node_iterator<node_base const> node_const_iterator;
+
+#endif // NODE_ITERATOR2_DWA2004110_HPP