From 8339e133ee46bde5d3f9a41db5005a3c626440d8 Mon Sep 17 00:00:00 2001
From: Daniel Liu <liudaniel@qq.com>
Date: Fri, 14 Jul 2023 11:25:22 +0800
Subject: [PATCH] add function IsZero for type Hash

---
 common/types.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/common/types.go b/common/types.go
index eea1201b11..72234a226b 100644
--- a/common/types.go
+++ b/common/types.go
@@ -73,6 +73,9 @@ func BigToHash(b *big.Int) Hash  { return BytesToHash(b.Bytes()) }
 func Uint64ToHash(b uint64) Hash { return BytesToHash(new(big.Int).SetUint64(b).Bytes()) }
 func HexToHash(s string) Hash    { return BytesToHash(FromHex(s)) }
 
+// IsZero returns if a Hash is empty
+func (h Hash) IsZero() bool { return h == Hash{} }
+
 // Get the string representation of the underlying hash
 func (h Hash) Str() string   { return string(h[:]) }
 func (h Hash) Bytes() []byte { return h[:] }