On Mon, Jul 08, 2002 at 07:57:08PM +0530, Dinesh Kumar wrote:
> Hi ,
>
> I'm implementing a Variant and declaring a self referential structure in
> CodeWarrior as below
> I'm facing the following error ,pl help !
>
>
>
> //struct Variant;
>
> struct Variant
> {
> Uint8 vt;
> char stringVal[256];
> UInt8 byteVal;
> UInt8 *byteArray;
> Boolean boolVal;
> UInt32 intVal;
> struct tagVARIANT varVal; <<----ERROR : Illegal Use of Incomplete
> Struct/Union/Class Variant
> };
I think you are trying to do:
struct Variant
{
Uint8 vt;
char stringVal[256];
UInt8 byteVal;
UInt8 *byteArray;
Boolean boolVal;
UInt32 intVal;
struct Variant *varVal;
};
where you store a _pointer_ to the struct, not the struct itself
Otherwise, how much space will use the structure? (Hint: you can't
have structures requiring infinite space :)
But the meaning of what you are trying to do is not clear, and from
the definition above, it seems you are trying to store only one instance
of a datatype at a time. If this is the case, you should use a union:
typedef enum vartype_tag { vt_string, vt_byte, vt_bytearray, vt_bool, vt_int } vartype;
struct variant
{
vartype vt;
union
{
char stringVal[256];
UInt8 byteVal;
UInt8 *byteArray;
Boolean boolVal;
UInt32 intVal;
} v;
};
Marco
--
========================================================================
Marco Pantaleoni [EMAIL PROTECTED]
Padova, Italy [EMAIL PROTECTED]
elastiC language developer http://www.elasticworld.org
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