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Date: -- (:)
From: skaller <skaller@u...>
Subject: Re: [Caml-list] Functors
On Sun, 2004-05-02 at 23:34, Jon Harrop wrote:
> On Sunday 02 May 2004 11:24, Martin Jambon wrote:
> > On Sun, 2 May 2004, Jon Harrop wrote:
> > > Functors appear to be somewhat similar to templates in C++. Does the
> > > functor approach produce more efficient code as it is partially
> > > specialised over the comparison function?
> >
> > Unfortunately no.
> > ...
> >   http://www.lri.fr/~signoles/ocamldefun/manual.html
> 
> Wow, ok. So ocamldefun maps ocaml code with functors onto ocaml code without 
> functors and, according to their examples, this can result in an 8 times 
> performance improvement due to inlining.
> 
> This begs the question: why is this functionality not in the compiler? In 
> fact, using functors with the current compiler actually reduces 
> performance...

The answer is separate compilation.

When you instantiate a Set.Make .. you only have
the interface. Hard to inline without actually having
the body of the functor..

-- 
John Skaller, mailto:skaller@users.sf.net
voice: 061-2-9660-0850, 
snail: PO BOX 401 Glebe NSW 2037 Australia
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