Merge pull request #25 from paritytech/impl_as_ref

impl AsRef<Self> for primitives

fixed-hash/src/hash.rs

@@ -51,6 +51,13 @@ macro_rules! construct_hash {
 			}
 		}
 
+		impl AsRef<$from> for $from {
+			#[inline]
+			fn as_ref(&self) -> &$from {
+				&self
+			}
+		}
+
 		impl ::core::ops::DerefMut for $from {
 			#[inline]
 			fn deref_mut(&mut self) -> &mut [u8] {

uint/src/uint.rs

@@ -551,6 +551,12 @@ macro_rules! construct_uint {
 		#[derive(Copy, Clone, Eq, PartialEq, Hash)]
 		pub struct $name(pub [u64; $n_words]);
 
+		impl AsRef<$name> for $name {
+			fn as_ref(&self) -> &$name {
+				&self
+			}
+		}
+
 		impl $name {
 			/// Convert from a decimal string.
 			pub fn from_dec_str(value: &str) -> Result<Self, $crate::FromDecStrErr> {