Re: [Caml-list] Run time error on exception

[Lorenzo Pomili <lorenzo.pomili85@gmail.com>]

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Thanks for reply, one more question there is a way in OCaml, for know if
function can produce side effects? I mean automatic way not read
documentation or source code ^^"

2018-02-01 8:10 GMT+01:00 Malcolm Matalka <mmatalka@gmail.com>:

> Exceptions basically mean "runtime error".  This is why some APIs use
> the result type instead of exceptions.  So the API could be something
> like:
>
> val int_of_string : string -> (int, err) result
>
> where err is some error type.
>
> I wrote a blog post about this years ago, the APIs in it might be out
> dated but the general concept is probably still applies:
>
> http://functional-orbitz.blogspot.se/2013/01/experiences-using-resultt-vs-
> exceptions.html
>
> Lorenzo Pomili <lorenzo.pomili85@gmail.com> writes:
>
> > Friend of mine, pointed out to me a case in Reason who cause no compile
> > time error but run time error, I had reimplemented similar case in OCaml:
> >
> >
> >
> > exception Generic_exc;;
> >
> > let string_of_string s = string_of_int (int_of_string s)
> >
> > let foo = string_of_string "foo"
> >
> > let fun_exeption x =
> >     match x with
> >     0 -> 0
> >     | _ -> raise Generic_exc
> > ;;
> >
> > let bar = string_of_int (fun_exeption 5)
> >
> >
> >
> > both foo and bar don't fail at compile time fail at run time, me and my
> > friend also try to reimplement similar case (the first one with string
> and
> > int) in Elm, and Elm compiler just say you have to manage exeption,
> because
> > function can actualy return exeption instead of int.
> >
> > There is a compile params or similar for check this kind of error? is a
> > side effect of have a multi-paradigm? and if is it, how to manage it?
> >
> > I belive I can use OCaml in functional way without just making attention
> to
> > not use side effect but if use of function like int_of_string can make
> run
> > time error, I probably approac to OCaml in wrong way, and I wanna
> > understand how to correct it.
>
>

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