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From: Krishna Myneni <krishna.myneni@ccreweb.org>
Newsgroups: comp.lang.forth
Subject: Re: 0 SET-ORDER why?
Date: Sun, 30 Jun 2024 11:10:17 -0500
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On 6/29/24 21:21, dxf wrote:
> On 30/06/2024 12:17 am, Krishna Myneni wrote:
>> On 6/28/24 10:50, Anton Ertl wrote:
>>> Krishna Myneni <krishna.myneni@ccreweb.org> writes:
>>>> On 6/26/24 02:49, Anton Ertl wrote:
>>>>> Krishna Myneni <krishna.myneni@ccreweb.org> writes:
>>>>>> Why is 0 a valid argument to SET-ORDER (from the optional Search-Order
>>>>>> word set)? It can leave a Forth system in a non-recoverable state.
>>>>>
>>>>> So what?  There are lots of ways to put a Forth system in a
>>>>> non-recoverable state.
>>>>> ...
>>>>
>>>> By design? No.
>>>
>>> Does it matter?
>>>
>>
>> Yes, it matters. Not everyone uses Forth to develop and use turnkey applications. Some of us rely on the Forth environment itself as the application interface, where definitions in a precise search order *are* the interface. Inadvertently emptying the search order and violating the notion of a minimum search order would mean loss of data from a lengthy computation or data acquisition.
> 
> Under what circumstances is 0 SET-ORDER executed inadvertently?
> 

One example: assume you have a value containing the number of wordlists

0 value Nwid

and it is not properly set. Then doing,

wid1 wid2 ... widn Nwid SET-ORDER

--
KM