fixed a few missing deletes when handling errors in grouter. Experimenting a new scope guard to hold temporary memory. (Patch from GuessWho, modified)

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@8093 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/util/rsmemory.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <stdlib.h>
+
+// This is a scope guard to release the memory block when going of of the current scope.
+// Can be very useful to auto-delete some memory on quit without the need to call free each time.
+//
+// Usage:
+//
+// {
+// 	unsigned char *mem = NULL ;
+// 	TemporaryMemoryHolder mem_holder(mem,size) ;
+//
+// 	[do something]
+// }	// mem gets freed automatically
+//
+class TemporaryMemoryHolder
+{
+	public:
+		TemporaryMemoryHolder(unsigned char *& mem,size_t s)
+			: _mem(mem)
+		{
+			_mem = (unsigned char *)malloc(s) ;
+		}
+
+		~TemporaryMemoryHolder()
+		{
+			if(_mem != NULL)
+			{
+				free(_mem) ;
+				_mem = NULL ;
+			}
+		}
+
+	private:
+		unsigned char *& _mem ;
+};
+
+