Auto merge of #22541 - Manishearth:rollup, r=Gankro 1.0.0-alpha.2

Continued from #22520

1 files changed, 0 insertions, 265 deletions

diff --git a/src/libcore/borrow.rs b/src/libcore/borrow.rs
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-// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! A module for working with borrowed data.
-//!
-//! # The `BorrowFrom` traits
-//!
-//! In general, there may be several ways to "borrow" a piece of data.  The
-//! typical ways of borrowing a type `T` are `&T` (a shared borrow) and `&mut T`
-//! (a mutable borrow). But types like `Vec<T>` provide additional kinds of
-//! borrows: the borrowed slices `&[T]` and `&mut [T]`.
-//!
-//! When writing generic code, it is often desirable to abstract over all ways
-//! of borrowing data from a given type. That is the role of the `BorrowFrom`
-//! trait: if `T: BorrowFrom<U>`, then `&T` can be borrowed from `&U`.  A given
-//! type can be borrowed as multiple different types. In particular, `Vec<T>:
-//! BorrowFrom<Vec<T>>` and `[T]: BorrowFrom<Vec<T>>`.
-//!
-//! # The `ToOwned` trait
-//!
-//! Some types make it possible to go from borrowed to owned, usually by
-//! implementing the `Clone` trait. But `Clone` works only for going from `&T`
-//! to `T`. The `ToOwned` trait generalizes `Clone` to construct owned data
-//! from any borrow of a given type.
-//!
-//! # The `Cow` (clone-on-write) type
-//!
-//! The type `Cow` is a smart pointer providing clone-on-write functionality: it
-//! can enclose and provide immutable access to borrowed data, and clone the
-//! data lazily when mutation or ownership is required. The type is designed to
-//! work with general borrowed data via the `BorrowFrom` trait.
-//!
-//! `Cow` implements both `Deref`, which means that you can call
-//! non-mutating methods directly on the data it encloses. If mutation
-//! is desired, `to_mut` will obtain a mutable references to an owned
-//! value, cloning if necessary.
-
-#![unstable(feature = "core",
-            reason = "recently added as part of collections reform")]
-
-use clone::Clone;
-use cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
-use fmt;
-use marker::Sized;
-use ops::Deref;
-use option::Option;
-use self::Cow::*;
-
-/// A trait for borrowing data.
-#[old_orphan_check]
-pub trait BorrowFrom<Owned: ?Sized> {
-    /// Immutably borrow from an owned value.
-    fn borrow_from(owned: &Owned) -> &Self;
-}
-
-/// A trait for mutably borrowing data.
-#[old_orphan_check]
-pub trait BorrowFromMut<Owned: ?Sized> : BorrowFrom<Owned> {
-    /// Mutably borrow from an owned value.
-    fn borrow_from_mut(owned: &mut Owned) -> &mut Self;
-}
-
-impl<T: ?Sized> BorrowFrom<T> for T {
-    fn borrow_from(owned: &T) -> &T { owned }
-}
-
-impl<T: ?Sized> BorrowFromMut<T> for T {
-    fn borrow_from_mut(owned: &mut T) -> &mut T { owned }
-}
-
-impl<'a, T: ?Sized> BorrowFrom<&'a T> for T {
-    fn borrow_from<'b>(owned: &'b &'a T) -> &'b T { &**owned }
-}
-
-impl<'a, T: ?Sized> BorrowFrom<&'a mut T> for T {
-    fn borrow_from<'b>(owned: &'b &'a mut T) -> &'b T { &**owned }
-}
-
-impl<'a, T: ?Sized> BorrowFromMut<&'a mut T> for T {
-    fn borrow_from_mut<'b>(owned: &'b mut &'a mut T) -> &'b mut T { &mut **owned }
-}
-
-impl<'a, T, B: ?Sized> BorrowFrom<Cow<'a, T, B>> for B where B: ToOwned<T> {
-    fn borrow_from<'b>(owned: &'b Cow<'a, T, B>) -> &'b B {
-        &**owned
-    }
-}
-
-/// Trait for moving into a `Cow`
-#[old_orphan_check]
-pub trait IntoCow<'a, T, B: ?Sized> {
-    /// Moves `self` into `Cow`
-    fn into_cow(self) -> Cow<'a, T, B>;
-}
-
-impl<'a, T, B: ?Sized> IntoCow<'a, T, B> for Cow<'a, T, B> where B: ToOwned<T> {
-    fn into_cow(self) -> Cow<'a, T, B> {
-        self
-    }
-}
-
-/// A generalization of Clone to borrowed data.
-#[old_orphan_check]
-pub trait ToOwned<Owned>: BorrowFrom<Owned> {
-    /// Create owned data from borrowed data, usually by copying.
-    fn to_owned(&self) -> Owned;
-}
-
-impl<T> ToOwned<T> for T where T: Clone {
-    fn to_owned(&self) -> T { self.clone() }
-}
-
-/// A clone-on-write smart pointer.
-///
-/// # Example
-///
-/// ```rust
-/// use std::borrow::Cow;
-///
-/// fn abs_all(input: &mut Cow<Vec<int>, [int]>) {
-///     for i in 0..input.len() {
-///         let v = input[i];
-///         if v < 0 {
-///             // clones into a vector the first time (if not already owned)
-///             input.to_mut()[i] = -v;
-///         }
-///     }
-/// }
-/// ```
-pub enum Cow<'a, T, B: ?Sized + 'a> where B: ToOwned<T> {
-    /// Borrowed data.
-    Borrowed(&'a B),
-
-    /// Owned data.
-    Owned(T)
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, T, B: ?Sized> Clone for Cow<'a, T, B> where B: ToOwned<T> {
-    fn clone(&self) -> Cow<'a, T, B> {
-        match *self {
-            Borrowed(b) => Borrowed(b),
-            Owned(ref o) => {
-                let b: &B = BorrowFrom::borrow_from(o);
-                Owned(b.to_owned())
-            },
-        }
-    }
-}
-
-impl<'a, T, B: ?Sized> Cow<'a, T, B> where B: ToOwned<T> {
-    /// Acquire a mutable reference to the owned form of the data.
-    ///
-    /// Copies the data if it is not already owned.
-    pub fn to_mut(&mut self) -> &mut T {
-        match *self {
-            Borrowed(borrowed) => {
-                *self = Owned(borrowed.to_owned());
-                self.to_mut()
-            }
-            Owned(ref mut owned) => owned
-        }
-    }
-
-    /// Extract the owned data.
-    ///
-    /// Copies the data if it is not already owned.
-    pub fn into_owned(self) -> T {
-        match self {
-            Borrowed(borrowed) => borrowed.to_owned(),
-            Owned(owned) => owned
-        }
-    }
-
-    /// Returns true if this `Cow` wraps a borrowed value
-    pub fn is_borrowed(&self) -> bool {
-        match *self {
-            Borrowed(_) => true,
-            _ => false,
-        }
-    }
-
-    /// Returns true if this `Cow` wraps an owned value
-    pub fn is_owned(&self) -> bool {
-        match *self {
-            Owned(_) => true,
-            _ => false,
-        }
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, T, B: ?Sized> Deref for Cow<'a, T, B> where B: ToOwned<T>  {
-    type Target = B;
-
-    fn deref(&self) -> &B {
-        match *self {
-            Borrowed(borrowed) => borrowed,
-            Owned(ref owned) => BorrowFrom::borrow_from(owned)
-        }
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, T, B: ?Sized> Eq for Cow<'a, T, B> where B: Eq + ToOwned<T> {}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, T, B: ?Sized> Ord for Cow<'a, T, B> where B: Ord + ToOwned<T> {
-    #[inline]
-    fn cmp(&self, other: &Cow<'a, T, B>) -> Ordering {
-        Ord::cmp(&**self, &**other)
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, 'b, T, U, B: ?Sized, C: ?Sized> PartialEq<Cow<'b, U, C>> for Cow<'a, T, B> where
-    B: PartialEq<C> + ToOwned<T>,
-    C: ToOwned<U>,
-{
-    #[inline]
-    fn eq(&self, other: &Cow<'b, U, C>) -> bool {
-        PartialEq::eq(&**self, &**other)
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, T, B: ?Sized> PartialOrd for Cow<'a, T, B> where B: PartialOrd + ToOwned<T> {
-    #[inline]
-    fn partial_cmp(&self, other: &Cow<'a, T, B>) -> Option<Ordering> {
-        PartialOrd::partial_cmp(&**self, &**other)
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, T, B: ?Sized> fmt::Debug for Cow<'a, T, B> where
-    B: fmt::Debug + ToOwned<T>,
-    T: fmt::Debug,
-{
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match *self {
-            Borrowed(ref b) => fmt::Debug::fmt(b, f),
-            Owned(ref o) => fmt::Debug::fmt(o, f),
-        }
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, T, B: ?Sized> fmt::Display for Cow<'a, T, B> where
-    B: fmt::Display + ToOwned<T>,
-    T: fmt::Display,
-{
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match *self {
-            Borrowed(ref b) => fmt::Display::fmt(b, f),
-            Owned(ref o) => fmt::Display::fmt(o, f),
-        }
-    }
-}