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Stabilize std::borrow

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This commit stabilizes `std::borrow`, making the following modifications
to catch up the API with language changes:

* It renames `BorrowFrom` to `Borrow`, as was originally intended (but
  blocked for technical reasons), and reorders the parameters
  accordingly.

* It moves the type parameter of `ToOwned` to an associated type. This
  is somewhat less flexible, in that each borrowed type must have a
  unique owned type, but leads to a significant simplification for
  `Cow`. Flexibility can be regained by using newtyped slices, which is
  advisable for other reasons anyway.

* It removes the owned type parameter from `Cow`, making the type much
  less verbose.

* Deprecates the `is_owned` and `is_borrowed` predicates in favor of
  direct matching.

The above API changes are relatively minor; the basic functionality
remains the same, and essentially the whole module is now marked
`#[stable]`.

[breaking-change]
This commit is contained in:
Aaron Turon 2015-02-11 23:16:32 -08:00
parent 9bb3b3772d
commit a99e698628
29 changed files with 753 additions and 407 deletions
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2
src/libstd/lib.rs
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@ -161,7 +161,6 @@ extern crate libc;
// NB: These reexports are in the order they should be listed in rustdoc
pub use core::any;
pub use core::borrow;
pub use core::cell;
pub use core::clone;
#[cfg(not(test))] pub use core::cmp;
@ -184,6 +183,7 @@ pub use core::error;
#[cfg(not(test))] pub use alloc::boxed;
pub use alloc::rc;
pub use core_collections::borrow;
pub use core_collections::fmt;
pub use core_collections::slice;
pub use core_collections::str;