Implement Ord for arrays

src/key.rs

@@ -49,10 +49,9 @@ pub const ONE_KEY: SecretKey = SecretKey([0, 0, 0, 0, 0, 0, 0, 0,
                                           0, 0, 0, 0, 0, 0, 0, 1]);
 
 /// A Secp256k1 public key, used for verification of signatures
-#[derive(Copy, Clone, PartialEq, Eq, Debug, Hash)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, PartialOrd, Ord, Hash)]
 pub struct PublicKey(ffi::PublicKey);
 
-
 #[cfg(any(test, feature = "rand"))]
 fn random_32_bytes<R: Rng>(rng: &mut R) -> [u8; 32] {
     let mut ret = [0u8; 32];

src/macros.rs

@@ -51,6 +51,20 @@ macro_rules! impl_array_newtype {
 
         impl Eq for $thing {}
 
+        impl PartialOrd for $thing {
+            #[inline]
+            fn partial_cmp(&self, other: &$thing) -> Option<::std::cmp::Ordering> {
+                self[..].partial_cmp(&other[..])
+            }
+        }
+
+        impl Ord for $thing {
+            #[inline]
+            fn cmp(&self, other: &$thing) -> ::std::cmp::Ordering {
+                self[..].cmp(&other[..])
+            }            
+        }
+
         impl Clone for $thing {
             #[inline]
             fn clone(&self) -> $thing {