[GRASS5] dbCatVal

[Glynn Clements]

Radim Blazek wrote:

> Is it harmless (for binary compatibility)  to change
> 
> typedef struct {
>     int  cat;  /* category */
>     int  isNull;
>     union {
>         int        i;
>         double     d;
>     } val;
> } dbCatVal;
> 
> to
> 
> typedef struct {
>     int  cat;  /* category */
>     int  isNull;
>     union {
>         int        i;
>         double     d;
>         dbString   *s;
>         dbDateTime *t;
>     } val;
> } dbCatVal;
> 
> ?
> 
> Pointers should not take > 8 bytes (double) I believe.

Pointer and double could have different alignment requirements.

10-byte pointers on x86/64 are a theoretical possibility, but I don't
think that any platform actually uses them.

-- 
Glynn Clements <glynn at gclements.plus.com>