Took Ingos considerations into account and added a simple hashtable implementation.

It's currently really broken so don't even try to test it, but you can still review it ;-).
Message2.cpp is not yet cleaned - more to come...

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13784 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/app/MessageField2.h

@@ -27,9 +27,13 @@ namespace BPrivate {
 
 class BMessageField {
 public:
+							BMessageField();
 							BMessageField(const char *name, type_code type);
+							BMessageField(const BMessageField &other);
 							~BMessageField();
 
+		BMessageField		&operator=(const BMessageField &other);
+
 		uint8				Flags();
 
 		void				SetName(const char *name);
@@ -45,11 +49,17 @@ public:
 		size_t				SizeAt(int32 index) const;
 		const void			*BufferAt(int32 index) const;
 
+		void				MakeEmpty();
+
 		bool				IsFixedSize() const { return fFixedSize; };
 		size_t				TotalSize() const { return fTotalSize; };
 
 		void				PrintToStream() const;
 
+		// hash table support
+		void				SetNext(BMessageField *next) { fNext = next; };
+		BMessageField		*Next() const { return fNext; };
+
 private:
 		bool				IsFixedSize(type_code type);
 
@@ -58,6 +68,8 @@ private:
 		BList				fItems;
 		bool				fFixedSize;
 		size_t				fTotalSize;
+
+		BMessageField		*fNext;
 };
 
 } // namespace BPrivate