Re: [sv-ec] {}

Only on dynamically sized arrays that are allowed to have no elements.

-Dave

Sent from my iPhone

On Jul 27, 2009, at 10:29 PM, "Bresticker, Shalom" <shalom.bresticker@intel.com 
 > wrote:

> Is it agreed that empty unpacked array concatenations were to be  
> allowed?
>
> Shalom
>
>> -----Original Message-----
>> From: jonathan.bromley@doulos.com
>> [mailto:jonathan.bromley@doulos.com]
>> Sent: Tuesday, July 28, 2009 1:05 AM
>> To: Bresticker, Shalom; sv-ec@server.eda.org
>> Subject: Re: [sv-ec] {}
>>
>> Shalom,
>>
>>> There seems to be an ambiguity in the LRM on the use of {} to denote
>>> an empty array.
>>>
>>> On the one hand, the LRM seems to restrict it to queues.
>>> The BNF non-terminal "primary" contains "empty_queue",
>> defined as "{ }",
>>
>>> and footnote 31 says that "{ } shall only be legal in the
>> context ofa
>> queue".
>>>
>>> On the other hand, 10.10 says,
>> [...]
>>
>> Mea culpa.  This is clearly an oversight in Mantis 1702.
>> I recall that I looked at the BNF and decided that no change
>> was needed because the existing production "concatenation"
>> does all that's required for unpacked array concatenation,
>> except that it does not admit the empty form {}, for which
>> the existing production "empty_queue" suffices.  But I missed
>> the footnote which, as you say, introduces doubt in the
>> reader's mind - especially when taken with the name
>> of the production "empty_queue".
>>
>> It would probably be best to rename "empty_queue" to
>> "empty_concatenation" and reword the offending footnote.
>> I'll raise a new Mantis for this.
>>
>> Thanks
>> -- 
>> Jonathan Bromley
>> Consultant
>>
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