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Distinguishing a structure from a typedef

Hi,

	I'm having some difficulties with user defined types in Sage.
Suppose that the user writes the following code:

	typedef int			Offset;
	struct someStruct {
		...
	};
	typedef struct someStruct	Type;

	main()
	{
		Offset	a;
		Type	b;
	}

Sage defines both 'a' and 'b' to be of type T_DERIVED_TYPE. Now, I need
to know whether 'a' or 'b' is really a structure.

What I do is use SgType::symbol() to obtain the symbol for the type and
to that symbol I ask the number of fields it has.
For 'a' I get back 0 and for 'b' I get back whatever number of fields
the structure has.

I tried using other approaches like using SgType::baseType() and
SgType::getTrueType() but I couldn't get them to work. Does anyone has
any suggestion on a better way of doing this? 

Thanks. Diego.

--
Diego A. Novillo                  | "We each pay a fabulous price for our
diego@cs.ualberta.ca              |  visions of paradise. But a spirit with
Computing Science - U of Alberta  |  a vision is a dream with a mission"
Edmonton, Alberta - Canada        |             Rush - Mission