<mr_hugo>
where can i learn about hash tables in OCaml ?
<mr_hugo>
is there any kind of data structure similar to a hash_table ?
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<rwmjones>
mr_hugo, Hashtbl, Map or Set
<mr_hugo>
:) thanx
<mr_hugo>
i just decided to use a list of tuples for the problem at hand
<mr_hugo>
ill probably need some functions to fetch the data as required...
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<mr_hugo>
hmm
<mr_hugo>
is there a limit on the number of elements a list can carry ?
<flux>
it's limited by your memory
<flux>
I'm thinking it might be, on a 32-bit architecture, 8 bytes per list element + size of the actual data
<mr_hugo>
im running a very big list of tuples in the toplevel, and in the end it prints like this: ('T', "SDL_JoystickClose"); ('T', ...); ...]
<flux>
yes, it doesn't show large (or recursive) lists in full in the toplevel
<flux>
I don't know if that behavior can be disabled
<mr_hugo>
hmm okok
<mr_hugo>
i have a question about recursive code and let bindings...
<mr_hugo>
http://pastebin.com/m15f01144 here in line 84, if i use the let binding let path = locate_lib lib_name then whenever i use the path binding, it will call the funcion locate_lib lib
<mr_hugo>
how to call only once ?
<mr_hugo>
or doesn't work like this ?
<flux>
hmm
<haelix>
flux: you say 8 bytes/element, but isn't it likely that Ocaml List are only singly linked ones ?
<flux>
it will call the lib only once
<flux>
haelix, they are. I'm thinking pointer to the data, pointer to next element.
<haelix>
ouh
<flux>
pointer to the data may already be the data in simple cases
<flux>
mr_hugo, it will call the locale_lib with argument lib_name only once when you use 'path'
<haelix>
yes
<mr_hugo>
hmm nice :D
<haelix>
it depends where the polymorphism is put
<haelix>
thx
<flux>
mr_hugo, btw, I wonder why your return value is a string, when it really should be string option, because you have the magic return value "not found" to indicate the "None"-case
<mr_hugo>
oh
<mr_hugo>
i didn't know there was a thing like "string option" :)
<mr_hugo>
where can i learn about it ?
<flux>
hm, you are using the option type elsewhere in the code
<flux>
like: try Some (Unix.readdir..) with End_of_file -> None
<flux>
and with match foo with | Some xx -> .. | None -> ..
<mr_hugo>
hmm yes
<mr_hugo>
i did that
<mr_hugo>
ah ok
<flux>
I think the ocaml documentation would have information on that
<mr_hugo>
yes yes
<mr_hugo>
okok
<mr_hugo>
yes i did that to work out some of these things
<mr_hugo>
but i wanted the "locate_lib" to return the "not found"
<mr_hugo>
i guess if i return None it will do fine...
<flux>
well, it seems fragile to me, if its purpose is not to return the result displayed to the end user
<flux>
you could have a valid path "not found" and it would be difficult to disambiguate
<mr_hugo>
yes
<mr_hugo>
:)
<mr_hugo>
i will fix it, thanks :)
<mr_hugo>
i'm leaving now, for a class...
<mr_hugo>
thanx for your support
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