libcore: Add ptr::to_mut_unsafe_ptr

1 files changed, 11 insertions, 2 deletions

diff --git a/src/libcore/ptr.rs b/src/libcore/ptr.rs
index 27998b49415..0117db25c58 100644
--- a/src/libcore/ptr.rs
+++ b/src/libcore/ptr.rs
@@ -2,6 +2,7 @@
 
 export addr_of;
 export to_unsafe_ptr;
+export to_mut_unsafe_ptr;
 export mut_addr_of;
 export offset;
 export const_offset;
@@ -132,8 +133,6 @@ unsafe fn memset<T>(dst: *mut T, c: int, count: uint)  {
   Transform a region pointer - &T - to an unsafe pointer - *T.
   This is safe, but is implemented with an unsafe block due to
   reinterpret_cast.
-
-  ("assimilate" because it makes the pointer forget its region.)
 */
 #[inline(always)]
 fn to_unsafe_ptr<T>(thing: &T) -> *T unsafe {
@@ -141,6 +140,16 @@ fn to_unsafe_ptr<T>(thing: &T) -> *T unsafe {
 }
 
 /**
+  Transform a mutable region pointer - &mut T - to a mutable unsafe pointer -
+  *mut T. This is safe, but is implemented with an unsafe block due to
+  reinterpret_cast.
+*/
+#[inline(always)]
+fn to_mut_unsafe_ptr<T>(thing: &mut T) -> *mut T unsafe {
+    unsafe::reinterpret_cast(thing)
+}
+
+/**
   Cast a region pointer - &T - to a uint.
   This is safe, but is implemented with an unsafe block due to
   reinterpret_cast.