[Ocaml-lib-devel] question about exthashtbl

[Henri DF <hen...@ep...>]

hi list,
i find myself often having to do [1] 

if Hashtbl.mem h k then
let v = Hashtbl.find h k in ... do stg with k here

I was wondering if it would be worth having a Hashtbl.find_opt, which 
returns Some v if there is a binding, None otherwise.

Of course, one could use a ('a, 'b option) Hashtbl.t and then use 
find_default (with default None) to achieve the same - but that has the 
overhead of *always* representing values as options.

Any thoughts on this?


Thanks
Henri

[1] And of course i could simply wrap Hashtbl.find and catch Not_found, 
but this is performance sensitive, and i have some vague recollection of 
there being a cost to putting stuff in a try.. with block. 

> Hi list,
> 
> Reading the news, it looks like GODI is taking off and that quite huge
> developments are being done. That's a nice thing for the ocaml community.
> As a window user, I cannot create a GODI package unless I switch to
> ocaml/Cygwin. Is there someone here willing to create an maintain the GODI
> package for ExtLib.... raise your hands :)
> 
> Regards,
> Nicolas Cannasse
> 
> 
> 
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