Added more __gap

qtumproject · Mar 11, 2024 · fdf190c · fdf190c
1 parent 5cf80cd
commit fdf190c
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diff --git a/contracts/handlers/ERC1155Handler.sol b/contracts/handlers/ERC1155Handler.sol
@@ -10,6 +10,13 @@ import {IERC1155MintableBurnable} from "../interfaces/tokens/IERC1155MintableBur
  * @title ERC1155Handler
  */
 abstract contract ERC1155Handler is IERC1155Handler, ERC1155Holder {
+    /**
+     * @dev This empty reserved space is put in place to allow future versions to add new
+     * variables without shifting down storage in the inheritance chain.
+     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
+     */
+    uint256[50] private __gap;
+
     modifier onlyNotStopped() virtual {
         _;
     }

diff --git a/contracts/handlers/ERC20Handler.sol b/contracts/handlers/ERC20Handler.sol
@@ -13,6 +13,13 @@ import {IERC20MintableBurnable} from "../interfaces/tokens/IERC20MintableBurnabl
 abstract contract ERC20Handler is IERC20Handler {
     using SafeERC20 for IERC20MintableBurnable;
 
+    /**
+     * @dev This empty reserved space is put in place to allow future versions to add new
+     * variables without shifting down storage in the inheritance chain.
+     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
+     */
+    uint256[50] private __gap;
+
     modifier onlyNotStopped() virtual {
         _;
     }

diff --git a/contracts/handlers/ERC721Handler.sol b/contracts/handlers/ERC721Handler.sol
@@ -10,6 +10,13 @@ import {IERC721MintableBurnable} from "../interfaces/tokens/IERC721MintableBurna
  * @title ERC721Handler
  */
 abstract contract ERC721Handler is IERC721Handler, ERC721Holder {
+    /**
+     * @dev This empty reserved space is put in place to allow future versions to add new
+     * variables without shifting down storage in the inheritance chain.
+     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
+     */
+    uint256[50] private __gap;
+
     modifier onlyNotStopped() virtual {
         _;
     }

diff --git a/contracts/handlers/NativeHandler.sol b/contracts/handlers/NativeHandler.sol
@@ -7,6 +7,13 @@ import {INativeHandler} from "../interfaces/handlers/INativeHandler.sol";
  * @title NativeHandler
  */
 abstract contract NativeHandler is INativeHandler {
+    /**
+     * @dev This empty reserved space is put in place to allow future versions to add new
+     * variables without shifting down storage in the inheritance chain.
+     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
+     */
+    uint256[50] private __gap;
+
     modifier onlyNotStopped() virtual {
         _;
     }