Allow to compare and sort tasks

src/task.rs

@@ -1,9 +1,10 @@
 use pbkdf2::pbkdf2_hmac;
 use sha2::Sha256;
+use std::cmp::Ordering;
 
 const DUMMY_SALT: &[u8] = b"some dummy salt";
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Eq, PartialEq)]
 pub struct Task {
 	pub data: &'static [u8],
 	pub cost: u32,
@@ -19,3 +20,15 @@ impl Task {
 		pbkdf2_hmac::<Sha256>(self.data, DUMMY_SALT, self.cost, &mut key1);
 	}
 }
+
+impl Ord for Task {
+	fn cmp(&self, other: &Self) -> Ordering {
+		self.cost.cmp(&other.cost)
+	}
+}
+
+impl PartialOrd for Task {
+	fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+		Some(self.cmp(other))
+	}
+}