#ocaml on 2002-04-24 — irc logs at freenode.irclog.whitequark.org

2002-04-01 22:16 Taaus changed the topic of #ocaml to: http://caml.inria.fr/oreilly-book/

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08:59 * gl &

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12:20 <sylvain> helloooooooo

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16:02 <sylvain> hellooo

16:03 <sylvain> is there anybody ?

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16:07 <gl> i *was* here

16:07 <gl> ..

16:07 * gl &

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17:51 <ott> hello all

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19:58 <Yurik> guys, anybody there?

20:19 <smkl> i am here now

20:20 <Yurik> can you consult me a bit?

20:25 <smkl> about what?

20:25 <Yurik> ocaml issues

20:25 <Yurik> :-)

20:25 <smkl> sure

20:26 <Yurik> first of all,

20:27 <Yurik> i'm a bit confused w/ the following issue:

20:27 <Yurik> i wrote my simple module (mymodule.mli and mymodule.ml)

20:27 <Yurik> they compile correctly

20:27 <Yurik> then i wrote test.ml

20:27 <Yurik> and only notion Mymodule.func works

20:27 <Yurik> open Mymodule

20:27 <Yurik> func

20:27 <Yurik> doesn't works :(

20:27 <Yurik> what can be the issues

20:28 <Yurik> (I understand that question is quite stupid, but... :)

20:30 <Yurik> more commonly, i could ask what are the right commands to build modules and link app w/ it (including modules that include C extensions)

20:30 <Yurik> in order to support either Mymodule.fun and open Mymodule ; fun

20:30 <smkl> what is the error message?

20:30 <Yurik> Syntax error

20:31 <smkl> so you just have open Mymodule \n func in your file? that doesn't work. you need open Mymodule;; func;; or open Mymodule let _ = func

20:32 <Yurik> oh, really

20:32 <Yurik> it now compiles

20:32 <Yurik> good

20:32 <Yurik> next, can I use int64, bigint, etc. from C extensions?

20:33 <smkl> building modules: ocamlc -c file.ml, executable: ocamlc -o a.out a.cmo b.cmo ...

20:34 <Yurik> and... is ocaml I/O fast enough and i can do not use C modules for it?

20:35 <Yurik> i mean binary file I/O

20:37 <smkl> binary IO should be fast, at least if you use the Unix module

20:37 <Yurik> but Unix provides only string output and input, right?

20:38 <Yurik> or am i mistaking?

20:39 <smkl> using bignums from C is probably quite hard, i think using int64 is possible

20:39 <smkl> what kind of binary IO do you want?

20:41 <Yurik> file binary IO

20:41 <Yurik> fread

20:42 <Yurik> fwrite

20:42 <Yurik> seek

20:42 <smkl> well, Unix interface has exactly those functions

20:43 <Yurik> and can output numbers, chars and so on?

20:45 <Yurik> probably /me missed it... looking to unix.mli

20:46 <smkl> hmm perhaps it's easier to just use the Pervasives. the functions there should be equivalent to fread/fwrite

20:46 <smkl> the ones in Unix are more like read/write in C

20:46 <Yurik> i know, i've tried w/ pervasives. but are they fast or slow?

20:47 <smkl> i cannot see any reason why they would be slow

20:47 * Yurik looks in pervasives.ml

20:47 <Yurik> really, they're external ;)

20:49 <Yurik> next, a bit more about integers but not 'int'

20:49 <Yurik> :)

20:50 <Yurik> could i extract hi/lo from int64?

20:50 <Yurik> (using std way)

20:51 <smkl> just use the bitwise operators?

20:53 <Yurik> ok, so now hi/lo funcs ;)

20:53 <Yurik> and how can i say let f (v : int64.int64)?

20:53 <Yurik> it fails ;)

20:54 <smkl> use Int64.int64 ?

20:54 <Yurik> oh, right.. just forgot ;)

20:55 <Yurik> Unbound constructor Int64.int64

20:56 <smkl> hmm, it's just 'int64'

20:57 <Yurik> ok, works

20:57 <Yurik> and how can i output it then (to channel)?

21:00 <smkl> as binary? looks like there is no standard way

21:01 <Yurik> hm

21:01 <Yurik> bad :-(

21:03 <Yurik> output_value produces big output :(

21:04 <smkl> you can convert it to a binary string first

21:05 <smkl> there are all kinds of byteorder problems with binary integer IO

21:06 <Yurik> write ints as a strings?

21:08 <smkl> i mean, just like hi/lo, but into 8 parts

21:08 <Yurik> ah

21:09 <Yurik> but each conversion will take a lot of time :-(

21:09 * Yurik is thinking to extend outputs with int32 and int64 output in C

21:10 * Yurik is out for few minutes

21:13 <smkl> it will just be few bitwise operators. i think you need to do some conversions in C too if you want to make it portable

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22:10 <karm> Hi.

22:12 <smkl> hello

22:12 <karm> I need some help using autoconf/automake with ocaml (in fact it's ocaml functions embedded in a C program)

22:12 <karm> may you help me ? :-)

22:12 <smkl> perhaps ...

22:14 <karm> I'd like to know where i can find information on this subject, or tips to get it working..

22:15 <gl> hi karm...

22:15 <gl> (si je m'attendais a ca..)

22:16 <karm> well hi

22:16 <karm> (hein ? :)

22:16 <gl> /nick vect

22:16 <karm> oh!

22:16 <gl> :|

22:17 <smkl> hmm, check some program like OCamlSDL

22:18 <karm> ok..

22:20 <smkl> it doesn't have ocaml embedded in C, though

22:21 <karm> it looks like i'll have to hack it

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22:31 <karm> err, always those old lame quit messages...

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23:29 <Yurik> smkl: are you still there?

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