make `as_ceiling` a general method of `P<N>`

1 files changed, 10 insertions, 1 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 239c802..3d08402 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -436,7 +436,7 @@ extern crate typenum;
 
 use core::cell::UnsafeCell;
 use core::marker::PhantomData;
-use core::ptr;
+use core::{mem, ptr};
 
 use cortex_m::ctxt::Context;
 use cortex_m::interrupt::Nr;
@@ -719,6 +719,15 @@ pub struct P<T> {
     _marker: PhantomData<T>,
 }
 
+impl<N> P<N> {
+    /// Turns this priority into a ceiling
+    pub fn as_ceiling(&self) -> &C<N> {
+        unsafe {
+            mem::transmute(self)
+        }
+    }
+}
+
 impl<T> P<T>
 where
     T: Unsigned,