deref_owned

This crate provides a smart pointer Owned, which points to a value that can be borrowed from an owned inner value. It's similar to Cow, except that it's always owning a value.

Moreover, a trait GenericCow is provided, which allows conversion from certain pointers into an owned value though an .into_owned() method. The trait GenericCow is implemented for:

• &'a B where B: ToOwned
• Cow<'a, B> where B: ToOwned
• Owned<'a, B, O> where O: Borrow<B>

Here

• B: ?Sized is the borrowed type (and also the type of the pointer target) and
• O: Borrow<B> is an owned type.

Changelog

• 2022-07-01: Version 0.6.1
  • Corrected Owned::borrowed to be PhantomData<for<'a> fn(&'a O) -> &'a B> instead of using PhantomData<*const B>, which broke correct autotrait behavior
• 2022-07-01: Version 0.6.0
  • Removed lifetime argument for Owned
  • Fixed changelog for version 0.5.0
• 2022-07-01: Version 0.5.0
  • A lifetime and type argument for the borrowed type has been added to Owned, which now contains a PhantomData of a reference to the borrowed type. This makes OwnedRef superfluous, which has been removed.
  • IntoOwned has been renamed to GenericCow.
  • Removed AsMut, BorrowMut and DerefMut implementations for Owned
• 2022-06-30: Version 0.4.0
  • Removed implementations of IntoOwned for Box<T>, Vec<T>, and String
  • New wrapper type OwnedRef<T>
• 2022-06-28: Version 0.3.0
  • Added implementations of IntoOwned for Box<T> (where T: ?Sized), Vec<T>, and String, with IntoOwned::Owned being set to Self (replaces previous implementation for Box<T>)
• 2022-06-27: Version 0.2.0
  • Some more trait implementations (AsRef, AsMut, Borrow, BorrowMut, and Display) have been added for Owned (and Debug::fmt's output is transparent now)
  • Deref is now a supertrait of IntoOwned and IntoOwned::Owned must implement Borrow<<Self as Deref>::Target>
• 2022-06-26: Version 0.1.0
  • Initial release