add Option::{err_or,err_or_else} methods under option_err_or gate
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This commit adds 2 methods to `Option<T>`: - `err_or` (similar to `ok_or`, signature is `fn<T, O>(Option<T>, O) -> Result<T, O>`) - `err_or_else` (similar to `ok_or_else`, signature is `fn<T, O>(Option<T>, impl FnOnce() -> O) -> Result<T, O>`) Both under `option_err_or` feature gate.
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dtolnay
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Jul 3, 2020
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Thanks for the PR!
I think I would prefer not to add this set of methods. As you mentioned, these are pretty rarely applicable. Instead of x.err_or(0) I would recommend that people write the same thing using existing methods as x.map_or(Ok(0), Err) or using match.
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This PR adds 2 methods to
Option<T>:err_or(similar took_or, signature isfn<T, O>(Option<T>, O) -> Result<T, O>)err_or_else(similar took_or_else, signature isfn<T, O>(Option<T>, impl FnOnce() -> O) -> Result<T, O>)Both under
option_err_orfeature gate.It seems unintuitive to have
ok_orandok_or_else, but noterr*versions. This PR fills this gap inResult<->Optiontransformations.Those methods may be less useful, then their
ok*versions, however, need for them comes every now and then.I'm curious if the name
err_oris ok? Isn't It too similar toerror?