Add clear function to Enumerable{Set,Map}

.changeset/good-cameras-rush.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`EnumerableMap`: Add `clear` function to EnumerableMaps which deletes all entries in the map.

.changeset/sixty-tips-wink.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`EnumerableSet`: Add `clear` function to EnumerableSets which deletes all items in the set.

contracts/utils/structs/EnumerableMap.sol

@@ -16,6 +16,7 @@ import {EnumerableSet} from "./EnumerableSet.sol";
  * - Entries are added, removed, and checked for existence in constant time
  * (O(1)).
  * - Entries are enumerated in O(n). No guarantees are made on the ordering.
+ * - Map can be cleared (all entries removed) in O(n).
  *
  * ```solidity
  * contract Example {
@@ -90,6 +91,20 @@ library EnumerableMap {
         return map._keys.remove(key);
     }
 
+    /**
+     * @dev Removes all the entries from a map. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(Bytes32ToBytes32Map storage map) internal {
+        uint256 len = length(map);
+        for (uint256 i = 0; i < len; ++i) {
+            delete map._values[map._keys.at(i)];
+        }
+        map._keys.clear();
+    }
+
     /**
      * @dev Returns true if the key is in the map. O(1).
      */
@@ -185,6 +200,16 @@ library EnumerableMap {
         return remove(map._inner, bytes32(key));
     }
 
+    /**
+     * @dev Removes all the entries from a map. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(UintToUintMap storage map) internal {
+        clear(map._inner);
+    }
+
     /**
      * @dev Returns true if the key is in the map. O(1).
      */
@@ -278,6 +303,16 @@ library EnumerableMap {
         return remove(map._inner, bytes32(key));
     }
 
+    /**
+     * @dev Removes all the entries from a map. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(UintToAddressMap storage map) internal {
+        clear(map._inner);
+    }
+
     /**
      * @dev Returns true if the key is in the map. O(1).
      */
@@ -371,6 +406,16 @@ library EnumerableMap {
         return remove(map._inner, bytes32(key));
     }
 
+    /**
+     * @dev Removes all the entries from a map. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(UintToBytes32Map storage map) internal {
+        clear(map._inner);
+    }
+
     /**
      * @dev Returns true if the key is in the map. O(1).
      */
@@ -464,6 +509,16 @@ library EnumerableMap {
         return remove(map._inner, bytes32(uint256(uint160(key))));
     }
 
+    /**
+     * @dev Removes all the entries from a map. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(AddressToUintMap storage map) internal {
+        clear(map._inner);
+    }
+
     /**
      * @dev Returns true if the key is in the map. O(1).
      */
@@ -557,6 +612,16 @@ library EnumerableMap {
         return remove(map._inner, bytes32(uint256(uint160(key))));
     }
 
+    /**
+     * @dev Removes all the entries from a map. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(AddressToAddressMap storage map) internal {
+        clear(map._inner);
+    }
+
     /**
      * @dev Returns true if the key is in the map. O(1).
      */
@@ -650,6 +715,16 @@ library EnumerableMap {
         return remove(map._inner, bytes32(uint256(uint160(key))));
     }
 
+    /**
+     * @dev Removes all the entries from a map. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(AddressToBytes32Map storage map) internal {
+        clear(map._inner);
+    }
+
     /**
      * @dev Returns true if the key is in the map. O(1).
      */
@@ -743,6 +818,16 @@ library EnumerableMap {
         return remove(map._inner, key);
     }
 
+    /**
+     * @dev Removes all the entries from a map. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(Bytes32ToUintMap storage map) internal {
+        clear(map._inner);
+    }
+
     /**
      * @dev Returns true if the key is in the map. O(1).
      */
@@ -836,6 +921,16 @@ library EnumerableMap {
         return remove(map._inner, key);
     }
 
+    /**
+     * @dev Removes all the entries from a map. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(Bytes32ToAddressMap storage map) internal {
+        clear(map._inner);
+    }
+
     /**
      * @dev Returns true if the key is in the map. O(1).
      */

contracts/utils/structs/EnumerableSet.sol

@@ -4,6 +4,8 @@
 
 pragma solidity ^0.8.20;
 
+import {Arrays} from "../Arrays.sol";
+
 /**
  * @dev Library for managing
  * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
@@ -14,6 +16,7 @@ pragma solidity ^0.8.20;
  * - Elements are added, removed, and checked for existence in constant time
  * (O(1)).
  * - Elements are enumerated in O(n). No guarantees are made on the ordering.
+ * - Set can be cleared (all elements removed) in O(n).
  *
  * ```solidity
  * contract Example {
@@ -114,6 +117,20 @@ library EnumerableSet {
         }
     }
 
+    /**
+     * @dev Removes all the values from a set. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the set grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function _clear(Set storage set) private {
+        uint256 len = _length(set);
+        for (uint256 i = 0; i < len; ++i) {
+            delete set._positions[set._values[i]];
+        }
+        Arrays.unsafeSetLength(set._values, 0);
+    }
+
     /**
      * @dev Returns true if the value is in the set. O(1).
      */
@@ -180,6 +197,16 @@ library EnumerableSet {
         return _remove(set._inner, value);
     }
 
+    /**
+     * @dev Removes all the values from a set. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the set grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(Bytes32Set storage set) internal {
+        _clear(set._inner);
+    }
+
     /**
      * @dev Returns true if the value is in the set. O(1).
      */
@@ -253,6 +280,16 @@ library EnumerableSet {
         return _remove(set._inner, bytes32(uint256(uint160(value))));
     }
 
+    /**
+     * @dev Removes all the values from a set. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the set grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(AddressSet storage set) internal {
+        _clear(set._inner);
+    }
+
     /**
      * @dev Returns true if the value is in the set. O(1).
      */
@@ -326,6 +363,16 @@ library EnumerableSet {
         return _remove(set._inner, bytes32(value));
     }
 
+    /**
+     * @dev Removes all the values from a set. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the set grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(UintSet storage set) internal {
+        _clear(set._inner);
+    }
+
     /**
      * @dev Returns true if the value is in the set. O(1).
      */

scripts/generate/templates/EnumerableMap.js

@@ -17,6 +17,7 @@ import {EnumerableSet} from "./EnumerableSet.sol";
  * - Entries are added, removed, and checked for existence in constant time
  * (O(1)).
  * - Entries are enumerated in O(n). No guarantees are made on the ordering.
+ * - Map can be cleared (all entries removed) in O(n).
  *
  * \`\`\`solidity
  * contract Example {
@@ -91,6 +92,20 @@ function remove(Bytes32ToBytes32Map storage map, bytes32 key) internal returns (
     return map._keys.remove(key);
 }
 
+/**
+ * @dev Removes all the entries from a map. O(n).
+ *
+ * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+ * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+ */
+function clear(Bytes32ToBytes32Map storage map) internal {
+    uint256 len = length(map);
+    for (uint256 i = 0; i < len; ++i) {
+        delete map._values[map._keys.at(i)];
+    }
+    map._keys.clear();
+}
+
 /**
  * @dev Returns true if the key is in the map. O(1).
  */
@@ -188,6 +203,16 @@ function remove(${name} storage map, ${keyType} key) internal returns (bool) {
     return remove(map._inner, ${toBytes32(keyType, 'key')});
 }
 
+/**
+ * @dev Removes all the entries from a map. O(n).
+ *
+ * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+ * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+ */
+function clear(${name} storage map) internal {
+    clear(map._inner);
+}
+
 /**
  * @dev Returns true if the key is in the map. O(1).
  */

scripts/generate/templates/EnumerableSet.js

@@ -5,6 +5,8 @@ const { TYPES } = require('./EnumerableSet.opts');
 const header = `\
 pragma solidity ^0.8.20;
 
+import {Arrays} from "../Arrays.sol";
+
 /**
  * @dev Library for managing
  * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
@@ -15,6 +17,7 @@ pragma solidity ^0.8.20;
  * - Elements are added, removed, and checked for existence in constant time
  * (O(1)).
  * - Elements are enumerated in O(n). No guarantees are made on the ordering.
+ * - Set can be cleared (all elements removed) in O(n).
  *
  * \`\`\`solidity
  * contract Example {
@@ -117,6 +120,20 @@ function _remove(Set storage set, bytes32 value) private returns (bool) {
     }
 }
 
+/**
+ * @dev Removes all the values from a set. O(n).
+ *
+ * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+ * function uncallable if the set grows to the point where clearing it consumes too much gas to fit in a block.
+ */
+function _clear(Set storage set) private {
+    uint256 len = _length(set);
+    for (uint256 i = 0; i < len; ++i) {
+        delete set._positions[set._values[i]];
+    }
+    Arrays.unsafeSetLength(set._values, 0);
+}
+
 /**
  * @dev Returns true if the value is in the set. O(1).
  */
@@ -185,6 +202,16 @@ function remove(${name} storage set, ${type} value) internal returns (bool) {
     return _remove(set._inner, ${toBytes32(type, 'value')});
 }
 
+/**
+ * @dev Removes all the values from a set. O(n).
+ *
+ * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+ * function uncallable if the set grows to the point where clearing it consumes too much gas to fit in a block.
+ */
+function clear(${name} storage set) internal {
+    _clear(set._inner);
+}
+
 /**
  * @dev Returns true if the value is in the set. O(1).
  */