Add AccessManagerEnumerable

Author: ernestognw

contracts/access/manager/extensions/AccessManagerEnumerable.sol

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.20;
+
+import {AccessManager} from "../AccessManager.sol";
+import {EnumerableSet} from "../../../utils/structs/EnumerableSet.sol";
+
+abstract contract AccessManagerEnumerable is AccessManager {
+    using EnumerableSet for EnumerableSet.AddressSet;
+    mapping(uint64 roleId => EnumerableSet.AddressSet) private _roleMembers;
+
+    function _grantRole(
+        uint64 roleId,
+        address account,
+        uint32 grantDelay,
+        uint32 executionDelay
+    ) internal override returns (bool) {
+        bool granted = super._grantRole(roleId, account, grantDelay, executionDelay);
+        if (granted) {
+            _roleMembers[roleId].add(account);
+        }
+        return granted;
+    }
+
+    function _revokeRole(uint64 roleId, address account) internal override returns (bool) {
+        bool revoked = super._revokeRole(roleId, account);
+        if (revoked) {
+            _roleMembers[roleId].remove(account);
+        }
+        return revoked;
+    }
+
+    function getRoleMembers(uint64 roleId, uint256 start, uint256 end) public view returns (address[] memory) {
+        return _roleMembers[roleId].values(start, end);
+    }
+
+    function getRoleMemberCount(uint64 roleId) public view returns (uint256) {
+        return _roleMembers[roleId].length();
+    }
+}