diff --git a/include/yaml-cpp/value/detail/iterator.h b/include/yaml-cpp/value/detail/iterator.h
new file mode 100644
index 0000000..2a4bb86
--- /dev/null
+++ b/include/yaml-cpp/value/detail/iterator.h
@@ -0,0 +1,110 @@
+#ifndef VALUE_DETAIL_ITERATOR_H_62B23520_7C8E_11DE_8A39_0800200C9A66
+#define VALUE_DETAIL_ITERATOR_H_62B23520_7C8E_11DE_8A39_0800200C9A66
+
+#if defined(_MSC_VER) || (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || (__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
+#pragma once
+#endif
+
+
+#include "yaml-cpp/dll.h"
+#include "yaml-cpp/value/ptr.h"
+#include "yaml-cpp/value/value.h"
+#include <boost/iterator/iterator_facade.hpp>
+#include <boost/utility/enable_if.hpp>
+#include <list>
+#include <utility>
+#include <vector>
+
+namespace YAML
+{
+	namespace detail
+	{
+		class node;
+		
+		struct iterator_value: public Value, std::pair<Value, Value> {
+			iterator_value() {}
+			explicit iterator_value(const Value& rhs): Value(rhs) {}
+			explicit iterator_value(const Value& key, const Value& value): std::pair<Value, Value>(key, value) {}
+		};
+
+		struct iterator_type { enum value { None, Sequence, Map }; };
+
+		template<typename V, typename SeqIter, typename MapIter>
+		class iterator_base: public boost::iterator_facade<iterator_base<V, SeqIter, MapIter>, V, std::bidirectional_iterator_tag>
+		{
+		private:
+			struct enabler {};
+			
+		public:
+			iterator_base(): m_type(iterator_type::None) {}
+			explicit iterator_base(shared_memory_holder pMemory, SeqIter seqIt): m_type(iterator_type::Sequence), m_pMemory(pMemory), m_seqIt(seqIt) {}
+			explicit iterator_base(shared_memory_holder pMemory, MapIter mapIt): m_type(iterator_type::Map), m_pMemory(pMemory), m_mapIt(mapIt) {}
+			
+			template<typename W, typename I, typename J>
+			explicit iterator_base(const iterator_base<W, I, J>& rhs, typename boost::enable_if<boost::is_convertible<W*, V*>, enabler>::type = enabler())
+			: m_type(rhs.m_type), m_pMemory(rhs.m_pMemory), m_seqIt(rhs.m_seqIt), m_mapIt(rhs.m_mapIt) {}
+			
+		private:
+			friend class boost::iterator_core_access;
+			template<typename, typename, typename> friend class iterator_base;
+			
+			template<typename W, typename I, typename J>
+			bool equal(const iterator_base<W, I, J>& rhs) const {
+				if(m_type != rhs.m_type || m_pMemory != rhs.m_pMemory)
+					return false;
+				
+				switch(m_type) {
+					case iterator_type::None: return true;
+					case iterator_type::Sequence: return m_seqIt == rhs.m_seqIt;
+					case iterator_type::Map: return m_mapIt == rhs.m_mapIt;
+				}
+				return true;
+			}
+			
+			void increment() {
+				switch(m_type) {
+					case iterator_type::None: break;
+					case iterator_type::Sequence: ++m_seqIt; break;
+					case iterator_type::Map: ++m_mapIt; break;
+				}
+			}
+
+			void decrement() {
+				switch(m_type) {
+					case iterator_type::None: break;
+					case iterator_type::Sequence: --m_seqIt; break;
+					case iterator_type::Map: --m_mapIt; break;
+				}
+			}
+			
+			V dereference() {
+				switch(m_type) {
+					case iterator_type::None: return V();
+					case iterator_type::Sequence: return V(Value(*m_seqIt, m_pMemory));
+					case iterator_type::Map: return V(Value(*m_mapIt->first, m_pMemory), Value(*m_mapIt->second, m_pMemory));
+				}
+				return V();
+			}
+			
+		private:
+			typename iterator_type::value m_type;
+			
+			shared_memory_holder m_pMemory;
+
+			SeqIter m_seqIt;
+			MapIter m_mapIt;
+		};
+
+		typedef std::vector<node *> node_seq;
+		typedef std::pair<node *, node *> kv_pair;
+		typedef std::list<kv_pair> node_map;
+		
+		typedef node_seq::iterator node_seq_iterator;
+		typedef node_seq::const_iterator node_seq_const_iterator;
+
+		typedef node_map::iterator node_map_iterator;
+		typedef node_map::const_iterator node_map_const_iterator;
+	}
+}
+
+#endif // VALUE_DETAIL_ITERATOR_H_62B23520_7C8E_11DE_8A39_0800200C9A66
diff --git a/include/yaml-cpp/value/iterator.h b/include/yaml-cpp/value/iterator.h
index 117b3e6..d687368 100644
--- a/include/yaml-cpp/value/iterator.h
+++ b/include/yaml-cpp/value/iterator.h
@@ -11,8 +11,28 @@
 
 namespace YAML
 {
-	class iterator: public detail::iterator_base<detail::iterator_value, detail::node_seq_iterator, detail::node_map_iterator> {};
-	class const_iterator: public detail::iterator_base<const detail::iterator_value, detail::node_seq_const_iterator, detail::node_map_const_iterator> {};
+	class iterator: public detail::iterator_base<detail::iterator_value, detail::node_seq_iterator, detail::node_map_iterator>
+	{
+	private:
+		typedef detail::iterator_base<detail::iterator_value, detail::node_seq_iterator, detail::node_map_iterator> base;
+		
+	public:
+		iterator() {}
+		explicit iterator(detail::shared_memory_holder pMemory, detail::node_seq_iterator seqIt): base(pMemory, seqIt) {}
+		explicit iterator(detail::shared_memory_holder pMemory, detail::node_map_iterator mapIt): base(pMemory, mapIt) {}
+	};
+	
+	class const_iterator: public detail::iterator_base<const detail::iterator_value, detail::node_seq_const_iterator, detail::node_map_const_iterator>
+	{
+	private:
+		typedef detail::iterator_base<const detail::iterator_value, detail::node_seq_const_iterator, detail::node_map_const_iterator> base;
+
+	public:
+		const_iterator() {}
+		explicit const_iterator(detail::shared_memory_holder pMemory, detail::node_seq_const_iterator seqIt): base(pMemory, seqIt) {}
+		explicit const_iterator(detail::shared_memory_holder pMemory, detail::node_map_const_iterator mapIt): base(pMemory, mapIt) {}
+		explicit const_iterator(const iterator& rhs): base(rhs) {}
+	};
 }
 
 #endif // VALUE_ITERATOR_H_62B23520_7C8E_11DE_8A39_0800200C9A66