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;

test/new-api/nodetests.cpp

@@ -443,6 +443,15 @@ namespace Test
             YAML_ASSERT(xy);
             return true;
         }
+        
+        TEST ClearNode()
+        {
+            YAML::Node node = YAML::Load("[1, 2, 3]");
+            YAML_ASSERT(!node.IsNull());
+            node.clear();
+            YAML_ASSERT(node.IsNull());
+            return true;
+        }
     }
 	
 	void RunNodeTest(TEST (*test)(), const std::string& name, int& passed, int& total) {
@@ -501,6 +510,7 @@ namespace Test
 		RunNodeTest(&Node::CloneMap, "clone map", passed, total);
 		RunNodeTest(&Node::CloneAlias, "clone alias", passed, total);
         RunNodeTest(&Node::ForceInsertIntoMap, "force insert into map", passed, total);
+        RunNodeTest(&Node::ClearNode, "clear node", passed, total);
 
 		std::cout << "Node tests: " << passed << "/" << total << " passed\n";
 		return passed == total;