Also implement Deref/DerefMut for MappedBuffer for &[u8]

gstreamer/src/buffer.rs

@@ -10,6 +10,7 @@ use std::ptr;
 use std::mem;
 use std::fmt;
 use std::slice;
+use std::ops;
 use std::u64;
 use std::usize;
 use std::marker::PhantomData;
@@ -479,6 +480,20 @@ impl AsMut<[u8]> for MappedBuffer<Writable> {
     }
 }
 
+impl<T> ops::Deref for MappedBuffer<T> {
+    type Target = [u8];
+
+    fn deref(&self) -> &[u8] {
+        self.as_slice()
+    }
+}
+
+impl ops::DerefMut for MappedBuffer<Writable> {
+    fn deref_mut(&mut self) -> &mut [u8] {
+        self.as_mut_slice()
+    }
+}
+
 impl<T> Drop for MappedBuffer<T> {
     fn drop(&mut self) {
         if let Some(ref buffer) = self.buffer {