Constant statement limitations.

[Alex Tweedly]

No.  What tripped me up was

> <?livecode
> put "lc version is" && the version & "<br>"
> constant x = 4
> put "this web page shows the problem" & "<br>"
> put "here x = " && x & "<br>"
>
> on somehandler
>   put "within a handler, x =" && x & "<br>"
> end somehandler
>
> somehandler
> put "and finally x still =" && x & "<br>"
> ?>
Constants do not take effect *outside* handlers. You rarely, if ever, 
have code outside a handler in "traditional" livecode - but revserver 
has changed that, so I think it's a reasonable request to enhance it to 
work for non-handle code.

But I am worried there's some obvious case that I haven't thought of 
that would prevent that being a good idea. If no-one comes up with a 
reason to keep this constraint, I'll submit an enhancement request.

-- Alex.

On 29/05/2012 04:57, dunbarx at aol.com wrote:
> Alex.
>
>
> I have found that if you say this:
>
>
> contant x = 4
>
>
> on mouseup
>    answer x
> end mouseup
>
>
> You get a "4"
>
>
> But, if you place the contstant statement below the handler, you geet "x".
>
>
> Is this what tripped you up?
>
>
> Craig Newman
>
>
>
> -----Original Message-----
> From: Alex Tweedly<alex at tweedly.net>
> To: How to use LiveCode<use-livecode at lists.runrev.com>
> Sent: Mon, May 28, 2012 7:02 pm
> Subject: Constant statement limitations.
>
>
> The dictionary entry for constant says:
>> If you place the constant statement in a handler, you can use the
>> constant anywhere in the handler. If you place the constant statement
>> in a script outside any handler, you can use the constant anywhere in
>> the handlers of that script.
> NB - "can use the constant anywhere *in the handlers* of that script".
>
> That was a reasonable limitation in traditional Livecode - but seems
> less reasonable in the context of revserver. It is (I think) common
> practice, and it's certainly possible, to have quite a lot of the
> "top-level" code be in the script itself, perhaps with html intermingled
> with it, i.e. not be in a handler.
>
> So the obvious, simple code fragment
>
> constant K = 3.14159
> put $_POST["diameter"] * K
>
> doesn't give the expected result :-)
>
> Anyone see any reason why constants *shouldn't* be usable outside handlers ?
>
> Thanks
> -- Alex.
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