Re: forward declaration in c

2009/5/25 Martijn van Oosterhout <kleptog@svana.org>:
> On Mon, May 25, 2009 at 01:20:05PM +0200, Pavel Stehule wrote:
>> Hello
>>
>> I can't to find fine syntax for cyclic declaration:
>
> If you mean forward declaraions of a type, just:
>
> struct ParseState
>
> will do, then:
>
>> typedef Node *(*TransformColumnRef_hook_type) (struct ParseState *pstate,
>> ColumnRef *cref);
>
> With the "struct" keyword added.
>
>> with empty declaration typedef struct ParseState;
>

yes, good advice

thank you
Pavel

> It might work with:
>
> typedef struct ParseState ParseState;
>
> But then you can't use typedef in the actual declaraion (AFAIK you can
> only forward declare structs, enums and such, but not typedefs).
>
> Have a nice day,
> --
> Martijn van Oosterhout   <kleptog@svana.org>   http://svana.org/kleptog/
>> Please line up in a tree and maintain the heap invariant while
>> boarding. Thank you for flying nlogn airlines.
>
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