Document size_of for 128-bit integers

[rust.git] / src / libcore / mem.rs

diff --git a/src/libcore/mem.rs b/src/libcore/mem.rs
index 116e56f4ae9fb6ea22e6da35affb2c9eed0c36ec..31635ffa53c83b20ab7172bd2ea5480760bcbbf6 100644 (file)
--- a/src/libcore/mem.rs
+++ b/src/libcore/mem.rs
@@ -194,10 +194,12 @@ pub fn forget<T>(t: T) {
 /// u16 | 2
 /// u32 | 4
 /// u64 | 8
+/// u128 | 16
 /// i8 | 1
 /// i16 | 2
 /// i32 | 4
 /// i64 | 8
+/// i128 | 16
 /// f32 | 4
 /// f64 | 8
 /// char | 4
@@ -635,8 +637,9 @@ pub fn swap<T>(x: &mut T, y: &mut T) {
     }
 }
 
-/// Replaces the value at a mutable location with a new one, returning the old value, without
-/// deinitializing either one.
+/// Moves `src` into the referenced `dest`, returning the previous `dest` value.
+///
+/// Neither value is dropped.
 ///
 /// # Examples
 ///
@@ -835,7 +838,9 @@ pub unsafe fn transmute_copy<T, U>(src: &T) -> U {
 
 /// Opaque type representing the discriminant of an enum.
 ///
-/// See the `discriminant` function in this module for more information.
+/// See the [`discriminant`] function in this module for more information.
+///
+/// [`discriminant`]: fn.discriminant.html
 #[stable(feature = "discriminant_value", since = "1.21.0")]
 pub struct Discriminant<T>(u64, PhantomData<fn() -> T>);
 
@@ -1164,6 +1169,14 @@ pub unsafe fn map<U, F>(this: PinMut<'a, T>, f: F) -> PinMut<'a, U> where
     {
         PinMut { inner: f(this.inner) }
     }
+
+    /// Assign a new value to the memory behind the pinned reference.
+    #[unstable(feature = "pin", issue = "49150")]
+    pub fn set(this: PinMut<'a, T>, value: T)
+        where T: Sized,
+    {
+        *this.inner = value;
+    }
 }
 
 #[unstable(feature = "pin", issue = "49150")]