From 07a59621cc2ce51d1344bf460776a501f79c8d8f Mon Sep 17 00:00:00 2001
From: David <dvdplm@gmail.com>
Date: Wed, 5 Sep 2018 22:51:11 +0200
Subject: [PATCH] impl MaybeEmpty for H256 and u64 (aka AccountId in
 prod/tests) (#665)

* impl MaybeEmpty for H256 and u64 (aka AccountId in prod/tests)

* binaries
---
 substrate/substrate/runtime/primitives/src/traits.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/substrate/substrate/runtime/primitives/src/traits.rs b/substrate/substrate/runtime/primitives/src/traits.rs
index fbfdfa8a8d..2d674f1e93 100644
--- a/substrate/substrate/runtime/primitives/src/traits.rs
+++ b/substrate/substrate/runtime/primitives/src/traits.rs
@@ -112,9 +112,17 @@ pub trait MaybeEmpty {
 	fn is_empty(&self) -> bool;
 }
 
-impl<T: Default + PartialEq> MaybeEmpty for T {
+// AccountId is `u64` in tests
+impl MaybeEmpty for u64 {
 	fn is_empty(&self) -> bool {
-		*self == T::default()
+		self.is_zero()
+	}
+}
+
+// AccountId is H256 in production
+impl MaybeEmpty for substrate_primitives::H256 {
+	fn is_empty(&self) -> bool {
+		self.is_zero()
 	}
 }