Re: [eclipse-clp-users] my own sum

Bogdan Tanasa wrote:

> I would like to define  a predicate similar with sum / 2. According to the
> manual :
> 
>  
> 
> call to sum(ExprList, Result) is equivalent to Result is sum(ExprList)
> 
>  
> 
> How can I do that ?
> 

Hi Bogdan,

I am not quite sure I understand what exactly you are asking. Are you 
asking how user defined functions can work in an expression?

The answer to that is ECLiPSe expressions allow any user defined 
predicate  to be part of the expression, with the last argument being 
used as the result of the function, i.e.

foo(X,Y,Res) where Res returns a number can be written in an expression
as  Res is foo(X,Y).

Cheers,

Kish


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