Re: Map is not tail recursive

From: William Chesters (
Date: Tue Jan 12 1999 - 12:49:15 MET

Date: Tue, 12 Jan 1999 11:49:15 GMT
Message-Id: <199901121149.LAA00641@toy.william.bogus>
From: William Chesters <>
Subject: Re: Map is not tail recursive
In-Reply-To: <>

Xavier Leroy writes:
> I would also contend that if your program routinely manipulate
> 100000-element lists, then you're probably using the wrong data
> structure anyway. But that's a different issue.

Good, I was hoping you would say that! Just because things are
traditionally done in a certain way in FP textbooks doesn't mean it
actually makes sense to do them that way in real life.

People hardly ever use linked lists in C++ or Java, and the reasons
why mostly hold good in ocaml.

However, implementing a polymorphic `vector' (resizable array) in
ocaml requires a small amount of fancy footwork because of the lack of
a universal `null' value ... there might be a case for implementing
this as part of the underlying language.

French-like paraphrase:

Les livres sur PF utilises exclusivement la linked list, mai pour la
plupart des applications cette structure n'est pas la plus efficiente.
Alors on ne l'utilise presque point en C++ ou Java. Mais ce n'est pas
100% facile =E1 faire une type `vector' en ocaml, parce ce que ocaml
manque un valeur "null".

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