[Info-vax] BASIC (and Horizon)

[Arne Vajhøj]

On 1/31/2024 4:28 PM, Lawrence D'Oliveiro wrote:
> I have never written a goto in C code (not production code, anyway). These
> days, you need to do so much dynamic allocation, there is nearly always
> some need for cleanup when exiting an inner block anyway, so you can’t
> just jump directly somewhere else first. The overall pattern looks like
> this:
> 
>      MyPtr obj = NULL;
>      do /*once*/
>        {
>          ... possible other stuff ...
>          «allocate memory for obj»;
>          if («error occurred»)
>              break;
>          ... possible other stuff using obj ...
>        }
>      while (false);
>      free(obj);
> 
> You can confirm, just by inspection, that there is no path out of the
> block that does not pass through the free() call precisely once.

And the difference compared to:

      MyPtr obj = NULL;
      ... possible other stuff ...
      «allocate memory for obj»;
      if («error occurred»)
          goto lbl_freeobj;
      ... possible other stuff using obj ...
   lbl_freeobj:
      free(obj);

are?

Arne