From: Damien Doligez <damien.doligez@inria.fr>
To: caml users <caml-list@inria.fr>
Subject: Re: [Caml-list] Bless me Father, for I have used Obj.magic
Date: Fri, 30 Dec 2011 12:41:04 +0100 [thread overview]
Message-ID: <98C4A68D-2A7C-415E-BD0D-AD5ECAE7D238@inria.fr> (raw)
In-Reply-To: <4EF47360.2010302@inria.fr>
On 2011-12-23, at 13:26, Fabrice Le Fessant wrote:
> On 12/23/2011 01:04 PM, rixed@happyleptic.org wrote:
>> No you are right, once eta-epxanded the compiler accepted the code.
>> I wonder what difference it makes in the generated code, if any.
>> Thank you very much for the tip!
>
> The difference is that the function is evaluated everytime you want to
> access the value. If the function is cheap and has no side-effect, it is
> perfectly fine, but if it is not the case, the cost will be much higher.
On the other hand, in the example shown by rixed the function expects
two arguments, so eta-expansion might even be more efficient because
you avoid going through the partial application machinery.
-- Damien
prev parent reply other threads:[~2011-12-30 11:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-22 21:24 rixed
2011-12-22 22:07 ` Fabrice Le Fessant
2011-12-22 22:19 ` rixed
2011-12-22 23:29 ` Thierry Martinez
2011-12-23 12:04 ` rixed
2011-12-23 12:26 ` Fabrice Le Fessant
2011-12-30 11:41 ` Damien Doligez [this message]
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