Path: news.daimi.aau.dk!not-for-mail
From: Peter Andersen <datpete@mjolner.dk>
Newsgroups: comp.lang.beta
Subject: Re: Problems using "This()"
Date: Fri, 6 Mar 1998 11:53:13 +0100 (MET)
Organization: DAIMI, Computer Science Dept. at Aarhus University
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Reply-To: Peter Andersen <datpete@mjolner.dk>
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Mikkel Orheim writes:
> 
> 
> I wonder if anyone would know the answer to the following 
> problem:
> When using "This()[]" to get the "self"-reference to a object,
> I get error when combining it with concurrency. Ex:
> 
> Agent: system
>  (#
>    ...
>   do
>    inner;
>    ...
>  #)
> 
> A1: @| Agent
> (#
>    Atest: ^| Agent;
>   do
>    This(Agent)[]->Atest[];
> #)
> Yield an error because of the usage of "Atest: ^| Agent;"
> When I use "Atest: ^Agent;" no error is given here (but is
> propagated). This is *not* what I want!
> Do anyone know how to cope with this?
> 

This is because the current system cannot determine whether the
outcome of the THIS operator should be an item or a component. So it is always an item, currently.

To overcome this, you can INCLUDE '~beta/sysutils/v1.6/objinterface'
and use the objectToComponent pattern, e.g. 

     THIS(Agent)[] -> ObjectToComponent -> ATest[]

Sincerely,

Peter Andersen, Mjolner Informatics