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Date: -- (:)
From: Samuel Mimram <Samuel.Mimram@e...>
Subject: Re: [Caml-list] One question
Sorry, I think I answered too quickly. The exception is effectively raised...

Samuel.

On Sun, 23 Feb 2003 18:28:31 +0100
"Alexander S. Usov" <A.S.Usov@KVI.nl> wrote:

> On Sun, 2003-02-23 at 18:12, Samuel Mimram wrote:
> > Hello.
> > 
> > I think you are confusing the operators = and ==. = is used to check
> > if two objects have the same "logical" contents whether == checks if 
> > two objects are exactly the same in memory.
> > When you type a = insert a "word", the function insert returns a new
> > lex_tree which has the same contents as the variable a but is another
> > object in memory. That is why I think you wanted to write :
> > 
> > let a = insert [] "word"
> > in
> > a = insert a "word" ;;
> > 
> > which effectively returns true. It is important to understand that the
> > variable a and the result returned by the function insert are logically 
> > the same but not physically.
> 
> Yes, I understand that == checks for a physical equality.
> But in case the word is already present in tree I return the same
> dictionary (note "raise Already" in insert). 
> The idea was to make shure that the dictionary won't be modified if we
> do not change anything in it.
> 
> -- 
> Best regards,
>   Alexander.
> 
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-- 
Samuel Mimram

Samuel.Mimram@ens-lyon.fr
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