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Author: Charles MeliceCharles Melice Date: Oct 3, 2006 07:25
"Stephen Pelc" mpeforth.com> a
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Author: Stephen PelcStephen Pelc Date: Aug 30, 2006 03:03
This the best compromise I can get to, taking into account all
contributions so far. The compromises in this draft take into
account name conflicts, stack effect conflicts, alignment and
fat/thin implementations.
Stephen
RfD: Structures - Version 3
30 August 2006, Stephen Pelc
Change History
==============
20060830 Removed some restrictions on FIELD: and children.
Moved some words to FLOATING EXT.
20060827 Added alignment to discussion.
20060822 Rewrite after criticism
20060821 First draft
To Do
=====
Test cases.
Rationale
=========
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Author: Anton ErtlAnton Ertl Date: Sep 2, 2006 09:25
>Mitch Bradley wrote the following about structure alignment:
...
>Since I do much more (b) than (a), I prefer a structure definition
>basis
>that is fundamentally unaligned. It is much easier to add alignment
>than to undo it."
He also wrote that he liked (the semantics of) Gforth's FIELD, which
does support, but not enforce alignment.
In particular, if you want unaligned fields, the only cost is that you
have to write an additional "1" per field. I would like to see a
rationale by you why you consider that worse than your proposal. The
only rationale I have seen by you is that you have had problems with
C; but Gforth is not C, and Gforth's FIELD does something different
than C; in particular:
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Author: ward mcfarlandward mcfarland Date: Oct 5, 2006 04:01
> In Factor (which is definitely not an ANS Forth) I use the convention
> that parsing words which read ahead from the input have names ending
> with a colon. I find it makes code easier to follow.
I find myself liking this style for words that require a termination
word.
Thus I would prefer
RECORD: .... ;RECORD
to
RECORD .... END-RECORD (or was it ENDRECORD, END_RECORD, RECORD-END)
and
CODE: ... ;CODE
to
CODE ... END-CODE
While I have no problem with CREATE VARIABLE VALUE etc since they do
not need a completion word.
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Author: EdEd Date: Oct 6, 2006 20:21
"Andreas Kochenburger" nospam.com> wrote in message news:93n9i215gmd15sdgokn0s8pu0e7cv37fgb@4ax.com...> On Thu, 5 Oct 2006 11:29:08 +0200, "Charles Melice" forthcad.com>
> wrote:>>Yes. My preference is to define only OFFSET.
>>
>> 0
>> cell offset +X
>> cell offset +Y
>> constant Point
>
> Sorry, but that's the thinking of somebody who knows the innards of
> his Forth system.
> A) it is not guaranteed to work in other environments
> B) it is semantically poor
>
> STRUCTURE
> 12 chars FIELD name
> cell FIELD number
> END-STRUCTURE
> ...
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Author: Charles MeliceCharles Melice Date: Oct 7, 2006 00:00
"Andreas Kochenburger" nospam.com> a
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Author: jackojacko Date: Oct 7, 2006 07:07
Charles Melice wrote:
> "Andreas Kochenburger" nospam.com> a écrit dans le message de news:
> 93n9i215gmd15sdgokn0s8pu0e7cv37fgb@4ax.com...>> On Thu, 5 Oct 2006 11:29:08 +0200, "Charles Melice" forthcad.com>
>> wrote:>>>Yes. My preference is to define only OFFSET.
>>>
>>> 0
>>> cell offset +X
>>> cell offset +Y
>>> constant Point
>>
>> Sorry, but that's the thinking of somebody who knows the innards of
>> his Forth system.
>> A) it is not guaranteed to work in other environments
>> B) it is semantically poor
>
>
> [offset (computer). (n.d.). Wikipedia, the free encyclopedia.
> Retrieved October 06, 2006, from Reference.com website: ...
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Author: jackojacko Date: Oct 7, 2006 07:33
jacko wrote:
> Charles Melice wrote:
> 2 CELL CELL IDX mystruct x y
: (IDX) CREATE + DUP , SWAP DOES> @ + ;
: IDX VOCABULARY DEFINITIONS CREATE 0 SWAP 0 DO (IDX) LOOP ;
CELL CELL 2 IDX mystruct x y
with revesrse order of sizes i.e. last CELL is size of x.
> note the blank line terminal. occam does not have parsed word terminals
> either.
>
> cheers.
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Author: jackojacko Date: Oct 7, 2006 07:37
correction.
: (IDX) CREATE DUP , + DOES> @ + ;
: IDX VOCABULARY DEFINITIONS CREATE 0 SWAP 0 DO (IDX) LOOP ;
CELL CELL 2 IDX mystruct x y
with revesrse order of sizes i.e. last CELL is size of x..
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Author: EdEd Date: Oct 7, 2006 21:48
"Charles Melice" forthcad.com> wrote in message news:8cWdncjI_cQgzbrYnZ2dnUVZ8tKdnZ2d@scarlet.biz...>
> "Andreas Kochenburger" nospam.com> a
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