Mr Walter. How it is possible to bypass a problem of alignment?

struct xxx
             {
              short a;
              char *pa;
              };

sizeof (struct xxx) gives 8, instead of expected 6. It is important for
compatibility.

Me i use this (I'm not sure it is up to date but it works):

//set alignment one byte
#ifdef __SC__
    #pragma SC align 1
#else
    #pragma option -a-
#endif

struct MyStruc {
.
.
};

//restore previous alignment
#ifdef __SC__
    #pragma SC align
#else
    #pragma option -a.
#endif

Ciao

Roland

"ZaitcevE.V." a écrit :

> Mr Walter. How it is possible to bypass a problem of alignment?
>
> struct xxx
>              {
>               short a;
>               char *pa;
>               };
>
> sizeof (struct xxx) gives 8, instead of expected 6. It is important for
> compatibility.

ZaitcevE.V. schrieb...
> How it is possible to bypass a problem of alignment?
> 
> struct xxx
>              {
>               short a;
>               char *pa;
>               };
> 
> sizeof (struct xxx) gives 8, instead of expected 6. It is important for
> compatibility.

You can specify alignment with the pragma pack. In your case you can use it this way:

  #pragma pack(push, 2)
  //alignment is now 2
  struct xxx {
     short a;
     char *pa;
  };
  #pragma pack(pop)
  // alignment restored to the old state


push/pop is not necessary but I find them very usefull as you don't have to reset the alignment to a fixed value.


Regards,
	Heinz