Re: [eclipse-users] Tool declaration

From: Kish Shen <kish_at_...2...>
Date: Tue, 01 May 2007 17:26:42 +0100
Siddharth Angrish wrote:
> Hi
>
>     is tool declaration in Eclipse same as meta_predicate declaration in
> other prologs like swi/sicstus/yap?
> That is,
> does the statement  ->   :- meta_predicate ltime(?,:).
> valid in swi, etc
>
> mean the same in Eclipse as ->
>                :- tool( ltime/2 , ltime/3).
>
> Thanks
> Siddharth
>
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>   
The tool declaration is used to provide some similar functionality as 
meta_predicate for SICStus/YAP (SWI's meta_predicate is really for 
compatibility with SICStus), but they are not the same, because of 
differences in the module systems.

In addition, the way the functionality is implemented is also different, 
for example, there is no concept that a particular argument is a goal 
argument in tool/2, but rather you (the programmer) are given the caller 
module which you can use explicitly. [and normally as a context module, 
i.e. using @/2, which is not very well distinguished in the SICStus 
(actually Quintus) style module systems]

So you may need to use tool/2 as part of your replacement for 
meta_predicate, but it will probably involve other rewriting of the 
actual code as well.

Cheers,

Kish
Received on Tue May 01 2007 - 17:26:51 CEST

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