FYI, there's already a method on Option that is unwrap() with an error message: expect().
Personally, I prefer making functions that don't fail and use Option or Result and then composing them with functions that fail for certain outputs, but I think I'm in the minority there. On Fri, Dec 6, 2013 at 1:45 PM, Simon Sapin <simon.sa...@exyr.org> wrote: > On 06/12/2013 20:55, Léo Testard wrote: > >> Hi, >> >> Just a suggestion, don't know what it's worth... >> >> For the "not helpful error message" thing, couldn't we extend the >> option API, to be able to specify at the creation of a None value >> the error string that will be displayed if one calls unwrap() on this >> value ? This may be useful in several situations. >> > > That would require making the memory representation of every Option > bigger. Just for the (hopefully) uncommon case of task failure, it’s not > worth the cost in my opinion. > > We could instead have .unwrap() that take an error message, but that > leaves the responsibility to the user of the API. > > > -- > Simon Sapin > _______________________________________________ > Rust-dev mailing list > Rust-dev@mozilla.org > https://mail.mozilla.org/listinfo/rust-dev >
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