Added Node::clear() function

include/yaml-cpp/node/impl.h

@@ -15,7 +15,7 @@
 
 namespace YAML
 {
-	inline Node::Node(): m_pNode(0)
+	inline Node::Node(): m_pNode(NULL)
 	{
 	}
 	
@@ -168,6 +168,11 @@ namespace YAML
 		return *this;
 	}
 	
+    inline void Node::clear()
+    {
+        m_pNode = NULL;
+    }
+
 	template<typename T>
 	inline void Node::Assign(const T& rhs)
 	{

include/yaml-cpp/node/node.h

@@ -56,6 +56,7 @@ namespace YAML
 		bool is(const Node& rhs) const;
 		template<typename T> Node& operator=(const T& rhs);
 		Node& operator=(const Node& rhs);
+        void clear();
         
 		// size/iterator
 		std::size_t size() const;