From d5308ee76b047e0db0bc8e6741e52d942e20b660 Mon Sep 17 00:00:00 2001
From: cygaar <tmpftl1@gmail.com>
Date: Mon, 13 Jun 2022 13:01:57 -0700
Subject: [PATCH] Use pointer

---
 contracts/ERC721A.sol | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/contracts/ERC721A.sol b/contracts/ERC721A.sol
index 46f4e500..fe38b9be 100644
--- a/contracts/ERC721A.sol
+++ b/contracts/ERC721A.sol
@@ -508,9 +508,10 @@ contract ERC721A is IERC721A {
      * @dev Zeroes out _tokenApprovals[tokenId]
      */
     function deleteTokenApproval(uint256 tokenId) private {
+        mapping(uint256 => address) storage tokenApprovalPtr = _tokenApprovals;
         assembly {
             mstore(0, tokenId)
-            mstore(32, _tokenApprovals.slot)
+            mstore(32, tokenApprovalPtr.slot)
             let hash := keccak256(0, 64)
             sstore(hash, 0)
         }