Andre Arpin <ar...@kingston.net> wrote:
(02/01/2011 13:24)
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>From: Andre Arpin <ar...@kingston.net>
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>Subject: Re: [wxlua-users] A simple general spin control
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>
>Lostgallifreyan <z.c...@...> writes:
>
>>
>> I added the final call to FeedBack to correctly fill the text fields when it
>loads, and I thought it looked
>> cool speaking German this time. :)
>>
>> -----------------------------------------------------------------------------
>
>Cool is also one of the favorite words of my grand children.
>I am pleased to see that you got it working and I now appreciate the
>usefulness of the spinCntlr.
>
Kewl is also cool, if used in *strict* moderation. :) I think it applies to the
SpinCtrl.
>NT={[0] = 'Null', "Eins","Zwei","Drei","Vier","Fünf",
>Is valid and give the same result.
>
Nice. Either I forgot it or didn't know it, but I suspected a neater way
existed.
>I recommend that use strict while testing and only use necessary global
>variables. You will be amazed at the number of time it will shorten your
>coding cycle. Unless you are like this Australian I worked with once. He wrote
>an editor on the development machine. I tried to enter a program ask him how
>you make correction on the line. He said I do not make typing errors.
>
I used to make very few, but many more now. Aging eyesight, mostly...
>This is a slightly modified version of the original.
>
Thankyou. I'll use it. I'm usually strict in their use anyway, always creating
them in Main() or using locals, but I have made exceptions it seems I
shouldn't, like using _ as a temp in any case where I know its content is
meaningless once its current use is done. I can always create that in Main too
though. I got into the habit of creating globals there because I like to know
at a glance what global variables I'm using. I also program in OPL (Psion
language), and in that it's impossible to do otherwise. :) They have to be the
first thing created in any procedure. I think OPL might let me make globals in
the first line of a sub-procedure, but it makes no sense to me to do this, it
would make it harder to keep track of them. In theory it might seem efficient
to do that so no space is allocated beyond need, but there are better kinds of
efficiency. I like to re-use variables a lot, so long as it makes sense to do
so.
>--
>-- strict.lua
>-- checks uses of undeclared global variables
>-- All global variables must be 'declared' through a regular assignment
>-- (even assigning nil will do) in a main chunk before being used
>-- anywhere or assigned to inside a function.
>--
>
>local mt = getmetatable(_G)
>if mt == nil then
> mt = {}
> setmetatable(_G, mt)
>end
>
>mt.__declared = {}
>
>mt.__newindex = function (t, n, v)
>--"_" is special
> if n~= '_' and not mt.__declared[n] then
> local w = debug.getinfo(2, "S").what
> if w ~= "main" and w ~= "C" then
> error("assign to undeclared variable '"..n.."'", 2)
> end
> mt.__declared[n] = true
> end
> rawset(t, n, v)
>end
>
>mt.__index = function (t, n)
> if not mt.__declared[n] and debug.getinfo(2, "S").what ~= "C" then
> error("variable '"..n.."' is not declared", 2)
> end
> return rawget(t, n)
>end
>
>Good luck
>
>Andre
>
>
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