Added IsNull function

include/null.h

@@ -6,10 +6,14 @@
 
 namespace YAML
 {
+	class Node;
+	
 	struct _Null {};
 	inline bool operator == (const _Null&, const _Null&) { return true; }
 	inline bool operator != (const _Null&, const _Null&) { return false; }
 	
+	bool IsNull(const Node& node);
+	
 	extern _Null Null;
 }
 

src/null.cpp

 #include "null.h"
+#include "node.h"
 
 namespace YAML
 {
 	_Null Null;
+
+	bool IsNull(const Node& node)
+	{
+		return node.Read(Null);
+	}
 }

yaml-reader/parsertests.cpp

@@ -261,8 +261,7 @@ namespace Test
 			doc[0] >> output;
 			if(output != "hello")
 				return false;
-			doc[1] >> output;
-			if(output != "~")
+			if(!IsNull(doc[1]))
 				return false;
 			doc[2] >> output;
 			if(output != "world")
@@ -297,9 +296,7 @@ namespace Test
 			YAML::Node doc;
 			parser.GetNextDocument(doc);
 			
-			std::string output;
-			doc["empty value"] >> output;
-			if(output != "~")
+			if(!IsNull(doc["empty value"]))
 				return false;
 			
 			return true;