Re: [Caml-list] using infix operators/functions in modules when not using "open"
Gabriel Scherer writes:
>> Module.("foo" (op) "bar")
>
> This is a local open (a more explicit notation is "let open Module in
> foo op bar"). I think this is a fine solution: I don't like open, but
> local mitigates its flaws.
>
> Another solution is to rebind your operator locally:
>
> let (op) = Module.blah in
> "foo" op "bar"
>
> (of course Module.blah doesn't need to be an infix itself)
>
> If you are going to use an infix operator in a wide scope, I think
> that such a rebinding solution is nice because it's more explicit,
> which is good when it helps users understand the code.
And that also works more globally as in
let (op) = Module.blah
let foo x y = x (op) y
MfG
Goswin
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Re: [Caml-list] using infix operators/functions in modules when not using "open"
> Module.("foo" (op) "bar")
This is a local open (a more explicit notation is "let open Module in
foo op bar"). I think this is a fine solution: I don't like open, but
local mitigates its flaws.
Another solution is to rebind your operator locally:
let (op) = Module.blah in
"foo" op "bar"
(of course Module.blah doesn't need to be an infix itself)
If you are going to use an infix operator in a wide scope, I think
that such a rebinding solution is nice because it's more explicit,
which is good when it helps users understand the code.
On Fri, Apr 27, 2012 at 1:01 AM, Haoyang Wang wrote:
>
> On Apr 26, 2012, at 3:36 PM, ocamllist.robertw...@spamgourmet.com wrote:
>
>> I'm a OCaml newbie. I don't understand how to use infix functions that are
>> in modules when I don't want to use "open".
>>
>> I did discover http://xahlee.org/ocaml/functions.html which explains that an
>> infix operator can be used as a prefix. So, this format:
>>
>> ((Module.(op)) "foo" "bar")
>>
>> does seem to work. But, intuitively, it seems like:
>>
>> "foo" Module.(op) "bar"
>>
>> would work -- it doesn't.
>>
>> Is there a way to keep the infix notation?
>>
>> Thanks.
>
>
> Module.("foo" (op) "bar")
>
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Re: [Caml-list] using infix operators/functions in modules when not using "open"
Haoyang Wang provided the answer you're looking for, I think!
In case you are writing your own modules with infix operators, I've found
the following style to be useful:
--- Inside Vector.ml ---
(* definition of some basic functions here... *)
(* now some infix defs using the basic functions, in "Ops" submodule *)
module Ops = struct
let ( +| ) u v = add u v
let ( -| ) u v = sub u v
let ( *| ) a v = scale a v
end
open Ops (* so that they are usable within Vector itself *)
---
--- Some other module without opening all of Vector ---
open Vector.Ops
let answer = a +| b
let same_answer = Vector.add a b
---
In some cases I'll also expose types in a Type submodule. This is to
minimize name-collision with record fields, but have direct access to the
fields in situations which it's appropriate (by doing "open Vector.Type",
for example).
Hope that's of some use!
-Tony
On Thu, Apr 26, 2012 at 5:01 PM, Haoyang Wang wrote:
>
> On Apr 26, 2012, at 3:36 PM, ocamllist.robertw...@spamgourmet.com wrote:
>
> > I'm a OCaml newbie. I don't understand how to use infix functions that
> are in modules when I don't want to use "open".
> >
> > I did discover http://xahlee.org/ocaml/functions.html which explains
> that an infix operator can be used as a prefix. So, this format:
> >
> > ((Module.(op)) "foo" "bar")
> >
> > does seem to work. But, intuitively, it seems like:
> >
> > "foo" Module.(op) "bar"
> >
> > would work -- it doesn't.
> >
> > Is there a way to keep the infix notation?
> >
> > Thanks.
>
>
> Module.("foo" (op) "bar")
>
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> Caml-list mailing list. Subscription management and archives:
> https://sympa-roc.inria.fr/wws/info/caml-list
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>
>
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Re: [Caml-list] using infix operators/functions in modules when not using "open"
On Apr 26, 2012, at 3:36 PM, ocamllist.robertw...@spamgourmet.com wrote:
> I'm a OCaml newbie. I don't understand how to use infix functions that are
> in modules when I don't want to use "open".
>
> I did discover http://xahlee.org/ocaml/functions.html which explains that an
> infix operator can be used as a prefix. So, this format:
>
> ((Module.(op)) "foo" "bar")
>
> does seem to work. But, intuitively, it seems like:
>
> "foo" Module.(op) "bar"
>
> would work -- it doesn't.
>
> Is there a way to keep the infix notation?
>
> Thanks.
Module.("foo" (op) "bar")
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