Use pointer

chiru-labs · Jun 13, 2022 · d5308ee · d5308ee
1 parent 223ebf9
commit d5308ee
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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)
         }