Re: dereferencing pointer to incomplete type

[Iain <tigermilk btinternet com>]

> Hello,
>
> while I was trying to write some recursive functions for my current application
> I got stuck with the following problem.
>
> I have a structure like this :
>
> typedef struct AdressBookItem {
>         ...
>         GtkCTreeNode *tree_item;
>         struct _AdressBookItem *parent;
>         ...
> } AdressBookItem;

Either the first line should be typedef struct _AdressBookItem
or the second line of the struct should be struct AdressBookItem *parent;

> But when I try something like this in my code :
>
> void blabla (AdressBookItem *adr) {
>         ...
>         GtkCTreeNode *parent;
>
>         ...
>         parent = adr->parent->tree_item;         << THIS LINE
>         ...
> }
>
> I get a compiler error "dereferencing pointer to incomplete type" for THIS LINE.
> I read some FAQs and Tutorials but didn't find an answer.
>
> So could anybody please give me an advice?

It is because parent is dereferencing to struct _AdressBookItem and the compiler
doesn't know what a struct _AdressBookItem is, only what struct AdressBookItem is.

iain