From 7ae22eff2ba38338633ae72a5f817efba9b1158c Mon Sep 17 00:00:00 2001
From: Antioch Peverell <apeverell@protonmail.com>
Date: Thu, 13 Dec 2018 13:44:50 +0000
Subject: [PATCH] add hash() to tip for safety (#2145)

---
 chain/src/types.rs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/chain/src/types.rs b/chain/src/types.rs
index 9a6ced64a..7e784b809 100644
--- a/chain/src/types.rs
+++ b/chain/src/types.rs
@@ -64,8 +64,7 @@ pub struct Tip {
 }
 
 impl Tip {
-	/// TODO - why do we have Tip when we could just use a block header?
-	/// Creates a new tip based on header.
+	/// Creates a new tip based on provided header.
 	pub fn from_header(header: &BlockHeader) -> Tip {
 		Tip {
 			height: header.height,
@@ -74,6 +73,12 @@ impl Tip {
 			total_difficulty: header.total_difficulty(),
 		}
 	}
+
+	/// *Really* easy to accidentally call hash() on a tip (thinking its a header).
+	/// So lets make hash() do the right thing here.
+	pub fn hash(&self) -> Hash {
+		self.last_block_h
+	}
 }
 
 impl Default for Tip {