From 705383adb037dddd834970d2c10edb32dae9fa56 Mon Sep 17 00:00:00 2001
From: Konrad Borowski <konrad@borowski.pw>
Date: Wed, 5 Dec 2018 14:39:36 +0100
Subject: [PATCH] Add unstable Option::copied()

---
 src/libcore/option.rs | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/src/libcore/option.rs b/src/libcore/option.rs
index cf1c77041b91..67bed63e6ff0 100644
--- a/src/libcore/option.rs
+++ b/src/libcore/option.rs
@@ -884,6 +884,48 @@ impl<T> Option<T> {
     }
 }
 
+impl<'a, T: Copy> Option<&'a T> {
+    /// Maps an `Option<&T>` to an `Option<T>` by copying the contents of the
+    /// option.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(copied)]
+    ///
+    /// let x = 12;
+    /// let opt_x = Some(&x);
+    /// assert_eq!(opt_x, Some(&12));
+    /// let copied = opt_x.copied();
+    /// assert_eq!(copied, Some(12));
+    /// ```
+    #[unstable(feature = "copied", issue = "0")]
+    pub fn copied(self) -> Option<T> {
+        self.map(|&t| t)
+    }
+}
+
+impl<'a, T: Copy> Option<&'a mut T> {
+    /// Maps an `Option<&mut T>` to an `Option<T>` by copying the contents of the
+    /// option.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(copied)]
+    ///
+    /// let mut x = 12;
+    /// let opt_x = Some(&mut x);
+    /// assert_eq!(opt_x, Some(&mut 12));
+    /// let copied = opt_x.copied();
+    /// assert_eq!(copied, Some(12));
+    /// ```
+    #[unstable(feature = "copied", issue = "0")]
+    pub fn copied(self) -> Option<T> {
+        self.map(|&mut t| t)
+    }
+}
+
 impl<'a, T: Clone> Option<&'a T> {
     /// Maps an `Option<&T>` to an `Option<T>` by cloning the contents of the
     /// option.