Add AtomicCell member functions

.travis.yml

@@ -16,23 +16,23 @@ matrix:
   - rust: 1.28.0
     name: "crossbeam on 1.28.0"
     script: ./ci/crossbeam.sh
-  - rust: 1.26.0
-    name: "crossbeam-channel on 1.26.0"
+  - rust: 1.28.0
+    name: "crossbeam-channel on 1.28.0"
     script: ./ci/crossbeam-channel.sh
   - rust: 1.28.0
     name: "crossbeam-deque on 1.28.0"
     script: ./ci/crossbeam-deque.sh
-  - rust: 1.26.0
-    name: "crossbeam-epoch on 1.26.0"
+  - rust: 1.28.0
+    name: "crossbeam-epoch on 1.28.0"
     script: ./ci/crossbeam-epoch.sh
-  - rust: 1.26.0
-    name: "crossbeam-queue on 1.26.0"
+  - rust: 1.28.0
+    name: "crossbeam-queue on 1.28.0"
     script: ./ci/crossbeam-queue.sh
   - rust: 1.28.0
     name: "crossbeam-skiplist on 1.28.0"
     script: ./ci/crossbeam-skiplist.sh
-  - rust: 1.26.0
-    name: "crossbeam-utils on 1.26.0"
+  - rust: 1.28.0
+    name: "crossbeam-utils on 1.28.0"
     script: ./ci/crossbeam-utils.sh
 
   # Test crates on nightly Rust.

crossbeam-channel/README.md

@@ -8,7 +8,7 @@ https://github.com/crossbeam-rs/crossbeam-channel)
 https://crates.io/crates/crossbeam-channel)
 [![Documentation](https://docs.rs/crossbeam-channel/badge.svg)](
 https://docs.rs/crossbeam-channel)
-[![Rust 1.26+](https://img.shields.io/badge/rust-1.26+-lightgray.svg)](
+[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 

crossbeam-epoch/README.md

@@ -8,7 +8,7 @@ https://github.com/crossbeam-rs/crossbeam-epoch)
 https://crates.io/crates/crossbeam-epoch)
 [![Documentation](https://docs.rs/crossbeam-epoch/badge.svg)](
 https://docs.rs/crossbeam-epoch)
-[![Rust 1.26+](https://img.shields.io/badge/rust-1.26+-lightgray.svg)](
+[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 

crossbeam-queue/README.md

@@ -8,7 +8,7 @@ https://github.com/crossbeam-rs/crossbeam-queue/tree/master/src)
 https://crates.io/crates/crossbeam-queue)
 [![Documentation](https://docs.rs/crossbeam-queue/badge.svg)](
 https://docs.rs/crossbeam-queue)
-[![Rust 1.26+](https://img.shields.io/badge/rust-1.26+-lightgray.svg)](
+[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 
@@ -37,7 +37,7 @@ extern crate crossbeam_queue;
 
 ## Compatibility
 
-The minimum supported Rust version is 1.26.
+The minimum supported Rust version is 1.28.
 
 ## License
 

crossbeam-utils/README.md

@@ -8,7 +8,7 @@ https://github.com/crossbeam-rs/crossbeam-utils/tree/master/src)
 https://crates.io/crates/crossbeam-utils)
 [![Documentation](https://docs.rs/crossbeam-utils/badge.svg)](
 https://docs.rs/crossbeam-utils)
-[![Rust 1.26+](https://img.shields.io/badge/rust-1.26+-lightgray.svg)](
+[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 

crossbeam-utils/src/atomic/atomic_cell.rs

@@ -21,7 +21,8 @@ use Backoff;
 /// [`AtomicCell::<T>::is_lock_free()`]: struct.AtomicCell.html#method.is_lock_free
 /// [`Acquire`]: https://doc.rust-lang.org/std/sync/atomic/enum.Ordering.html#variant.Acquire
 /// [`Release`]: https://doc.rust-lang.org/std/sync/atomic/enum.Ordering.html#variant.Release
-pub struct AtomicCell<T> {
+#[repr(transparent)]
+pub struct AtomicCell<T: ?Sized> {
     /// The inner value.
     ///
     /// If this value can be transmuted into a primitive atomic type, it will be treated as such.
@@ -49,24 +50,6 @@ impl<T> AtomicCell<T> {
         }
     }
 
-    /// Returns a mutable reference to the inner value.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use crossbeam_utils::atomic::AtomicCell;
-    ///
-    /// let mut a = AtomicCell::new(7);
-    /// *a.get_mut() += 1;
-    ///
-    /// assert_eq!(a.load(), 8);
-    /// ```
-    #[doc(hidden)]
-    #[deprecated(note = "this method is unsound and will be removed in the next release")]
-    pub fn get_mut(&mut self) -> &mut T {
-        unsafe { &mut *self.value.get() }
-    }
-
     /// Unwraps the atomic cell and returns its inner value.
     ///
     /// # Examples
@@ -156,6 +139,61 @@ impl<T> AtomicCell<T> {
     }
 }
 
+impl<T: ?Sized> AtomicCell<T> {
+    /// Returns a raw pointer to the underlying data in this atomic cell.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use crossbeam_utils::atomic::AtomicCell;
+    ///
+    /// let mut a = AtomicCell::new(5);
+    ///
+    /// let ptr = a.as_ptr();
+    /// ```
+    #[inline]
+    pub fn as_ptr(&self) -> *mut T {
+        self.value.get()
+    }
+
+    /// Returns a mutable reference to the inner value.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use crossbeam_utils::atomic::AtomicCell;
+    ///
+    /// let mut a = AtomicCell::new(7);
+    /// *a.get_mut() += 1;
+    ///
+    /// assert_eq!(a.load(), 8);
+    /// ```
+    #[doc(hidden)]
+    #[deprecated(note = "this method is unsound and will be removed in the next release")]
+    pub fn get_mut(&mut self) -> &mut T {
+        unsafe { &mut *self.value.get() }
+    }
+}
+
+impl<T: Default> AtomicCell<T> {
+    /// Takes the value of the atomic cell, leaving `Default::default()` in its place.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use crossbeam_utils::atomic::AtomicCell;
+    ///
+    /// let a = AtomicCell::new(5);
+    /// let five = a.take();
+    ///
+    /// assert_eq!(five, 5);
+    /// assert_eq!(a.into_inner(), 0);
+    /// ```
+    pub fn take(&self) -> T {
+        self.swap(Default::default())
+    }
+}
+
 impl<T: Copy> AtomicCell<T> {
     /// Loads a value.
     ///