1. Re: Implementing structures
At 12:11 PM 4/23/98 -0700, David Cuny wrote:
>Let me see if I understand what you are asking for:
>
>1. Ability to define sequences with structured elements.
>2. Type checking for the elements.
>3. Ability to re-use element names with different structures
>4. Implemented as an include file.
Exactly (except #4)
>Assuming that something like *this* is the optimal syntax:
>
> myPoint.x = 11
> myLine.point1.x = 32
> x = myLine.point2.y
>
>I can offer the following versions:
>
>[Fairly Little Overhead]
>
> myPoint = set( myPoint, ptX, 11 )
> myLine = set( myLine, {lnPoint1, ptX}, 32 )
> x = get( myLine, {lnPoint2, ptY} )
>
<snip some more examples>
>Do any of these appeal to you (or other people)?
>
These seem more OO than what we have been discussing.
Looking thru some old Pascal code, I find structures used
extensively. Everywhere, actually. Quite useful, and makes
for cleaner code.
An example converted to Euphorish:
structure listbox
coords location -- we're assuming type coords
coords size -- is already defined as
sequence caption -- a structure with elements
atom maxlen -- x and y, type checked to be
....etc. -- within valid range for screen coords.
assignments would be done in the normal way:
with listbox
location = {1,1}
size = {100,100}
caption = "My List"
maxlen = 25
end listbox
You could use the same names (location...etc) for
other gadgets:
messagebox:location = {12,16}
The difference would be you could refer to listbox as a unit
(like any sequence) but assignments would be type checked,
i.e. location could not be assigned 1, or "Here". and maxlen
couldn't be "Lou" or {2,1} (Oh,yeah: no more LOCATION = 1,
SIZE=2, constant declarations needed, either)
I am not at all sure this could be implemented in any way
other than a change to Euphoria itself. Hope I am wrong.
>PS: When are you going to post your Win95 for DOS program? >I'd *love* to =
take a look at it.
Saturday -- ok, maybe Sunday. Depends upon all sorts of
things, including the barometric pressure...
Irv
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