From a329a61b9bf01bfc3f9f7316bb800b2bc8b76382 Mon Sep 17 00:00:00 2001
From: Richo Healey <richo@psych0tik.net>
Date: Tue, 7 Apr 2015 00:40:22 -0700
Subject: alloc: impl fmt::Pointer for Rc, Arc and Box

Closes #24091
---
 src/liballoc/arc.rs   |  7 +++++++
 src/liballoc/boxed.rs | 10 ++++++++++
 src/liballoc/rc.rs    |  7 +++++++
 3 files changed, 24 insertions(+)

(limited to 'src/liballoc')

diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index 68bde147611..ff176d81591 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -668,6 +668,13 @@ impl<T: fmt::Debug> fmt::Debug for Arc<T> {
     }
 }
 
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<T> fmt::Pointer for Arc<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Pointer::fmt(&*self._ptr, f)
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: Default + Sync + Send> Default for Arc<T> {
     #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs
index 2801cf38cb7..4468e425a85 100644
--- a/src/liballoc/boxed.rs
+++ b/src/liballoc/boxed.rs
@@ -275,6 +275,16 @@ impl<T: fmt::Debug + ?Sized> fmt::Debug for Box<T> {
     }
 }
 
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<T> fmt::Pointer for Box<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        // It's not possible to extract the inner Uniq directly from the Box,
+        // instead we cast it to a *const which aliases the Unique
+        let ptr: *const T = &**self;
+        fmt::Pointer::fmt(&ptr, f)
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized> Deref for Box<T> {
     type Target = T;
diff --git a/src/liballoc/rc.rs b/src/liballoc/rc.rs
index 56822cfe28a..67805d10a4a 100644
--- a/src/liballoc/rc.rs
+++ b/src/liballoc/rc.rs
@@ -634,6 +634,13 @@ impl<T: fmt::Debug> fmt::Debug for Rc<T> {
     }
 }
 
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<T> fmt::Pointer for Rc<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Pointer::fmt(&*self._ptr, f)
+    }
+}
+
 /// A weak version of `Rc<T>`.
 ///
 /// Weak references do not count when determining if the inner value should be
-- 
cgit 1.4.1-3-g733a5