[Gambas-user] Arrays in Structures

[Tobias Boege]

On Sun, 17 Jun 2018, Demosthenes Koptsis wrote:
> Hello,
> 
> may i have an example of an Array in a Struct ?
> 
> *PUBLIC* *STRUCT* _Identifier_ ... _Field /k/_ [ _Embedded array
> declaration_ ] *AS* [ _Datatype_ ] ... *END STRUCT*
> 
> 
> is the next one correct?
> 
> Public Struct aioinit
>   aio_threads As Integer
>   aio_num As Integer
>   aio_locks As Integer
>   aio_usedba As Integer
>   aio_debug As Integer
>   aio_numusers As Integer
>   aio_reserved[2] As Integer[]
> End Struct
> 
> when i run it it does not complain for errors.
> 

That of course depends on what you want to do. The above gives you
an embedded array of size 2, whose elements are Integer[] objects.

If you're interfacing with external libraries, you likely want
it to be just two integers:

  aio_reserved[2] As Integer

Also note that my local manual tells me that one of the reserved
ints became used "already" in glibc 2.2 (that was around the beginning
of the millennium):

    struct aioinit {
      int aio_threads;    /* Maximum number of threads */
      int aio_num;        /* Number of expected simultaneous
                             requests */
      int aio_locks;      /* Not used */
      int aio_usedba;     /* Not used */
      int aio_debug;      /* Not used */
      int aio_numusers;   /* Not used */
      int aio_idle_time;  /* Number of seconds before idle thread
                             terminates (since glibc 2.2) */
      int aio_reserved;
  };

Regards,
Tobi

-- 
"There's an old saying: Don't change anything... ever!" -- Mr. Monk