provides a MaybeOwned<'a,T> type different to std's Cow it implements From<T> and From<&'a T> and does not require ToOwned
This crate provides a MaybeOwned<'a,T> enum. Different to std::borrow::Cow it implements From<T> and From<&'a T> and does not require a ToOwned implementation. While this can be nice for API‘s mainly consuming T’s not implementing ToOwned or implementing ToOwned through Clone it also means it's borrowed version of String is &String and not &str making it less performant for cases like String or Vec.
Documentation can be viewed on docs.rs.
Take a look at the examples dir and the documentation for more complete examples.
The main benefit of MaybeOwned over Cow is for API design, allowing API consumer to pass in both T and &'a T:
//... in a trait implementation fn register<D>(&mut self, key: SomeId, data: D) where D: Into<MaybeOwned<'a, Data>> { self.map.entry(key).or_insert_with(||data.into()); } //... //... in usage // use owned data registry.register(id1, data_owned); // use a reference to the data registry.register(id2, &data_ref); // it ok to use the same reference again registry.register(id3, &data_ref); //...
Licensed under either of
at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
v0.3.4:
make_owned() as a to_mut() replacement, but also available for MaybeOwnedMut and more clear in it's functionality.as_mut() method to MaybeOwned which return a Option<&mut T>MaybeOwnedMutv0.3.3:
v0.3.2:
std::ops implementationsv0.3.1:
serde support