Re: Struct Error

Kaz Kylheku <643-408-1753@kylheku.com> writes:

On 2025-01-22, bart <bc@freeuk.com> wrote:

Gcc 14.1 gives me an error compiling this code:
>
   struct vector;
   struct scenet;
>
   struct vector {
       double x;
       double y;
       double z;
   };
>
   struct scenet {
       struct vector center;
       double radius;
       struct scenet (*child)[];
   };
>
The error is:
>
   error: array type has incomplete element type 'struct scenet'
    struct scenet (*child)[];
                   ^~~~~

>
This looks like a bug to me. There is on reason why an
incomplete array type (a pointer to which /is/ allowed!)
should be constrained to have a complete element.

It may be a bug in the standard, but it's not a bug in the compiler:

  6.7.6.2 Array declarators
  Constraints

  ... The element type shall not be an incomplete or function type. ...

There is no dispensation that avoids this constraint when a pointer to
such an array is being declared (the constraint is on the array
declarator) nor when is type will be soon completed.

--
Ben.