#ocaml on 2017-01-21 — irc logs at freenode.irclog.whitequark.org

2016-11-11 21:04 adrien changed the topic of #ocaml to: Discussions about the OCaml programming language | http://www.ocaml.org | Current MOOC: https://huit.re/ocamlmooc | OCaml 4.04.0 release notes: http://ocaml.org/releases/4.04.html | Try OCaml in your browser: http://try.ocamlpro.com | Public channel logs at http://irclog.whitequark.org/ocaml

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05:22 <coddinkn> hi, I am in a compilers class using ocaml and I have a question about how to handle an issue with function application precedence

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05:31 <coddinkn> nevermind it seems like I figured it out, just needed to surround a type constructor with parens

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11:51 <orbifx> what' up folk?

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13:20 <orbifx> I supposed everyone is too busy looking after their camels on a Saturday

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13:23 <Onemorenickname> hello people

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13:33 <Onemorenickname> after having done "opam install extlib", what have I left to do before I can "Open Extlib" without getting an "Unbound module Error" ? I can't find

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13:46 <Lordpigish> hello, i have a binary tree of = Nil | Node of 'a * 'a tree * 'a tree, i have this working Node(x,l,r) -> x::conv l@ conv r;; that creates a list of all values. how do i change this to create a list with value mutiplyed by the next one?

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13:53 <octachron> Onemorenickname, you need to require the extlib package; for instance, you need "#require "extlib" in the toplevel

13:55 <octachron> Lordpigish, do you mean: transform [a_0; a_1; a_2; … ] into [a_0 * a_1; a_1 * a_2; a_2 * a_3; … ] ?

13:56 <Onemorenickname> octachron, i don't know the requires yet, i will check that, thanks :)

13:57 <octachron> Onemorenickname, which build system are you using?

13:57 <Onemorenickname> ocamlbuild

13:57 <Onemorenickname> oh, it's the same thing as for unix and string ?

13:59 <octachron> Onemorenickname, yes: package(extlib) in _tags should work

13:59 <Onemorenickname> perfect, thanks :)

13:59 <Lordpigish> Onemorenickname, yes thats exactly what ia m trying

14:02 <Onemorenickname> octachron, it works ! thanks :D

14:02 <Lordpigish> ah, ups. i meant to say octachron, thats what i want xD

14:05 <octachron> Lordpigish, then the easiest way is probably to work directly on the list of values that you constructed first

14:05 <Lordpigish> yeah thats the easiest way no doubt

14:06 <octachron> then you can define a recursive function (or use a List.fold_left) to do the transformation

14:06 <Lordpigish> that i can do, but i am really just trying to understand more trees

14:06 <Lordpigish> i know its possible i just dont see how

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14:11 <octachron> Lordpigish, I am not sure that your function is very natural for tree. However, what you could do is redefine a specialized version of (@) and (::) to work on "multiplied list"

14:12 <octachron> then " Node(x,l,r) -> x::conv l@ conv r;;" would works

14:17 <flux> Yaron Minsk> Modular implicits is a big change, but unlike changes to where type information is available in the compiler, it's one that is actually in progress and seems like it's really going to land.

14:17 <flux> nice to have someone believe that, perhaps we'll actually see them at some point :)

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16:15 <lpaste> A pasted “A” at http://lpaste.net/21886947181985792

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17:58 <ocaml535> Hi

17:58 <mengu> bucklescript is amazing

17:58 <ocaml535> I am fairly new OCaml, I encounter an issue but couldn't find any solution. I want to read all the content of a binary file.

17:59 <ocaml535> I am able to open an input channel, but then I feel that most functions are targeted for "regular" files (text files)

18:00 <ocaml535> Do you know how I can get a "buffer" (or string ?) with the content of a binary file ? (It is small file, fitting in memory)

18:02 <malc_> ocaml535: there are several pitfalls there though (esp. on 32bit platforms)

18:02 <ocaml535> test

18:03 <ocaml535> Ok, I have a 64bit computer

18:03 ocaml535 is now known as demu

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18:03 <demu> This is a code intended simply intended for a prototype, I do not need compatibility with other platforms

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18:06 <malc_> demu: let ic = open_in_bin "<path>" in

18:06 <malc_> let b = Bytes.create len in

18:06 <malc_> really_input ic b 0 len;;

18:06 <malc_> let len = in_channel_length ic in

18:06 <malc_> let s = Bytes.to_string b in

18:06 <malc_> ...

18:06 <demurgos> malc_: What are the pittfalls ?

18:07 <malc_> demurgos: 16Mb cap on string length

18:07 <demu> Unfortunately, I feel that in_channel_length does not return the full length

18:07 <malc_> open_in vs open_in_bin (windows)

18:07 <demu> (I have a test file with 8 bytes, it returns 3)

18:08 <demu> Ok, I'll try with Bytes.create, thank you

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18:11 <yawaramin> demu: also take a look at Unix.read

18:12 <yawaramin> it will let you loop through reading a file in one or more chunks and putting the chunks in a bytes value

18:14 <demu> ok

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18:17 <malc_> demu: https://github.com/moosotc/llpp/blob/master/utils.ml#L225 for the Unix approach

18:18 <demu> Thank you, I was looking for this

18:20 <demu> I still have an issue with the length: the file has 8 bytes, but in_channel_length returns 3 and if I hard code "8", I get an "End_of_file" exception.

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18:20 <demu> My file has the bytes (hex): 43 57 53 0f 18 f7 04 00

18:21 <demu> The first 3 bytes are ASCII characters so I think that's why he outputs "3"

18:23 <yawaramin> with malc_'s code you don't need the length, you get the entire file as a bytes value

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18:30 <demu> Ok, I was able to read it with malc_'s code, I had an other issue in my code

18:30 <demu> Thank you all

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