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Re: How to check if a symbol has been defined?
From: |
Valeriy E. Ushakov |
Subject: |
Re: How to check if a symbol has been defined? |
Date: |
Tue, 25 Nov 2003 21:17:13 +0300 |
User-agent: |
Mutt/1.4i |
On Tue, Nov 25, 2003 at 20:58:12 +0300, flamasuta wrote:
> From: "flamasuta" <address@hidden>
> X-Diagnostic: Not on the accept list
Please, subscribe. Posting to the list is restricted to subscribers
only.
[BTW, has *anything* been decided about the new hosting for the list?]
> Is it possible to check if a symbol has already been defined?
>
> For example, in pseudo-code:
> if (symbol is defined) then
> do that thing
> else
> do another thing
> endif
>
> Or, at least, is it possible to re-define a symbol (only if it is
> currently undefined)?
No. Lout is not a macro language. Some examples of what you can do
can be found here:
http://snark.ptc.spbu.ru/~uwe/lout/essays/496.scoping.txt
http://snark.ptc.spbu.ru/~uwe/lout/essays/636.scoping.txt
SY, Uwe
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