Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.forth > #56468

Re: Define a variable only not defined.

From "HAA" <someone@microsoft.com>
Newsgroups comp.lang.forth
Subject Re: Define a variable only not defined.
Date 2017-03-30 10:03 +1000
Organization Aioe.org NNTP Server
Message-ID <obhek7$1upr$1@gioia.aioe.org> (permalink)
References <252d2e3a-a277-4447-9bb0-7de4955d03d6@googlegroups.com>

Show all headers | View raw

Faisal wrote:
> I want to define a forth variable only if  not defined. Basically I want to avoid the
> redefinition of variables. Is there any word in forth to support this? I'm thinking
> about something like this(hypothetical code).
>
> : DefineOnly (varname)
>    (Ifndef) varname
>       variable varname
>    (then)
> ;

What if pre-existing 'varname' happens not to be a variable?  Bad luck?

Back to comp.lang.forth | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Define a variable only not defined. Faisal <faisalm83@gmail.com> - 2017-03-29 02:39 -0700
  Re: Define a variable only not defined. minforth@arcor.de - 2017-03-29 04:20 -0700
    Re: Define a variable only not defined. Faisal <faisalm83@gmail.com> - 2017-03-29 04:26 -0700
      Re: Define a variable only not defined. Coos Haak <htrofhc@gmail.com> - 2017-03-29 14:58 +0200
        Re: Define a variable only not defined. Alex <alex@rivadpm.com> - 2017-03-29 14:41 +0100
        Re: Define a variable only not defined. anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-03-29 13:54 +0000
          Re: Define a variable only not defined. Mikael Nordman <oh2aun@gmail.com> - 2017-03-29 12:06 -0700
            Re: Define a variable only not defined. Coos Haak <htrofhc@gmail.com> - 2017-03-29 21:30 +0200
              Re: Define a variable only not defined. Mikael Nordman <oh2aun@gmail.com> - 2017-03-29 12:53 -0700
  Re: Define a variable only not defined. "HAA" <someone@microsoft.com> - 2017-03-30 10:03 +1000
    Re: Define a variable only not defined. Julian Fondren <julian.fondren@gmail.com> - 2017-03-29 19:00 -0700
      Re: Define a variable only not defined. "Elizabeth D. Rather" <erather@forth.com> - 2017-03-29 16:35 -1000

csiph-web