{ "fileName": "EnumerableSet.sol", "contractName": "EnumerableSet", "source": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Library for managing\n * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive\n * types.\n *\n * Sets have the following properties:\n *\n * - Elements are added, removed, and checked for existence in constant time\n * (O(1)).\n * - Elements are enumerated in O(n). No guarantees are made on the ordering.\n *\n * ```\n * contract Example {\n * // Add the library methods\n * using EnumerableSet for EnumerableSet.AddressSet;\n *\n * // Declare a set state variable\n * EnumerableSet.AddressSet private mySet;\n * }\n * ```\n *\n * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`\n * (`UintSet`) are supported.\n */\nlibrary EnumerableSet {\n // To implement this library for multiple types with as little code\n // repetition as possible, we write it in terms of a generic Set type with\n // bytes32 values.\n // The Set implementation uses private functions, and user-facing\n // implementations (such as AddressSet) are just wrappers around the\n // underlying Set.\n // This means that we can only create new EnumerableSets for types that fit\n // in bytes32.\n\n struct Set {\n // Storage of set values\n bytes32[] _values;\n\n // Position of the value in the `values` array, plus 1 because index 0\n // means a value is not in the set.\n mapping (bytes32 => uint256) _indexes;\n }\n\n /**\n * @dev Add a value to a set. O(1).\n *\n * Returns true if the value was added to the set, that is if it was not\n * already present.\n */\n function _add(Set storage set, bytes32 value) private returns (bool) {\n if (!_contains(set, value)) {\n set._values.push(value);\n // The value is stored at length-1, but we add 1 to all indexes\n // and use 0 as a sentinel value\n set._indexes[value] = set._values.length;\n return true;\n } else {\n return false;\n }\n }\n\n /**\n * @dev Removes a value from a set. O(1).\n *\n * Returns true if the value was removed from the set, that is if it was\n * present.\n */\n function _remove(Set storage set, bytes32 value) private returns (bool) {\n // We read and store the value's index to prevent multiple reads from the same storage slot\n uint256 valueIndex = set._indexes[value];\n\n if (valueIndex != 0) { // Equivalent to contains(set, value)\n // To delete an element from the _values array in O(1), we swap the element to delete with the last one in\n // the array, and then remove the last element (sometimes called as 'swap and pop').\n // This modifies the order of the array, as noted in {at}.\n\n uint256 toDeleteIndex = valueIndex - 1;\n uint256 lastIndex = set._values.length - 1;\n\n // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs\n // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.\n\n bytes32 lastvalue = set._values[lastIndex];\n\n // Move the last value to the index where the value to delete is\n set._values[toDeleteIndex] = lastvalue;\n // Update the index for the moved value\n set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based\n\n // Delete the slot where the moved value was stored\n set._values.pop();\n\n // Delete the index for the deleted slot\n delete set._indexes[value];\n\n return true;\n } else {\n return false;\n }\n }\n\n /**\n * @dev Returns true if the value is in the set. O(1).\n */\n function _contains(Set storage set, bytes32 value) private view returns (bool) {\n return set._indexes[value] != 0;\n }\n\n /**\n * @dev Returns the number of values on the set. O(1).\n */\n function _length(Set storage set) private view returns (uint256) {\n return set._values.length;\n }\n\n /**\n * @dev Returns the value stored at position `index` in the set. O(1).\n *\n * Note that there are no guarantees on the ordering of values inside the\n * array, and it may change when more values are added or removed.\n *\n * Requirements:\n *\n * - `index` must be strictly less than {length}.\n */\n function _at(Set storage set, uint256 index) private view returns (bytes32) {\n require(set._values.length > index, \"EnumerableSet: index out of bounds\");\n return set._values[index];\n }\n\n // AddressSet\n\n struct AddressSet {\n Set _inner;\n }\n\n /**\n * @dev Add a value to a set. O(1).\n *\n * Returns true if the value was added to the set, that is if it was not\n * already present.\n */\n function add(AddressSet storage set, address value) internal returns (bool) {\n return _add(set._inner, bytes32(uint256(value)));\n }\n\n /**\n * @dev Removes a value from a set. O(1).\n *\n * Returns true if the value was removed from the set, that is if it was\n * present.\n */\n function remove(AddressSet storage set, address value) internal returns (bool) {\n return _remove(set._inner, bytes32(uint256(value)));\n }\n\n /**\n * @dev Returns true if the value is in the set. O(1).\n */\n function contains(AddressSet storage set, address value) internal view returns (bool) {\n return _contains(set._inner, bytes32(uint256(value)));\n }\n\n /**\n * @dev Returns the number of values in the set. O(1).\n */\n function length(AddressSet storage set) internal view returns (uint256) {\n return _length(set._inner);\n }\n\n /**\n * @dev Returns the value stored at position `index` in the set. O(1).\n *\n * Note that there are no guarantees on the ordering of values inside the\n * array, and it may change when more values are added or removed.\n *\n * Requirements:\n *\n * - `index` must be strictly less than {length}.\n */\n function at(AddressSet storage set, uint256 index) internal view returns (address) {\n return address(uint256(_at(set._inner, index)));\n }\n\n\n // UintSet\n\n struct UintSet {\n Set _inner;\n }\n\n /**\n * @dev Add a value to a set. O(1).\n *\n * Returns true if the value was added to the set, that is if it was not\n * already present.\n */\n function add(UintSet storage set, uint256 value) internal returns (bool) {\n return _add(set._inner, bytes32(value));\n }\n\n /**\n * @dev Removes a value from a set. O(1).\n *\n * Returns true if the value was removed from the set, that is if it was\n * present.\n */\n function remove(UintSet storage set, uint256 value) internal returns (bool) {\n return _remove(set._inner, bytes32(value));\n }\n\n /**\n * @dev Returns true if the value is in the set. O(1).\n */\n function contains(UintSet storage set, uint256 value) internal view returns (bool) {\n return _contains(set._inner, bytes32(value));\n }\n\n /**\n * @dev Returns the number of values on the set. O(1).\n */\n function length(UintSet storage set) internal view returns (uint256) {\n return _length(set._inner);\n }\n\n /**\n * @dev Returns the value stored at position `index` in the set. O(1).\n *\n * Note that there are no guarantees on the ordering of values inside the\n * array, and it may change when more values are added or removed.\n *\n * Requirements:\n *\n * - `index` must be strictly less than {length}.\n */\n function at(UintSet storage set, uint256 index) internal view returns (uint256) {\n return uint256(_at(set._inner, index));\n }\n}\n", "sourcePath": "contracts/utils/EnumerableSet.sol", "sourceMap": "724:7062:109:-:0;;;;;;;;;;;;;;;;;;;;;;;;;", "deployedSourceMap": "724:7062:109:-:0;;;;;;;;", "abi": [], "ast": { "absolutePath": "contracts/utils/EnumerableSet.sol", "exportedSymbols": { "EnumerableSet": [ 13904 ] }, "id": 13905, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 13511, "literals": [ "solidity", "^", "0.7", ".0" ], "nodeType": "PragmaDirective", "src": "33:23:109" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": { "id": 13512, "nodeType": "StructuredDocumentation", "src": "58:665:109", "text": " @dev Library for managing\n https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive\n types.\n Sets have the following properties:\n - Elements are added, removed, and checked for existence in constant time\n (O(1)).\n - Elements are enumerated in O(n). No guarantees are made on the ordering.\n ```\n contract Example {\n // Add the library methods\n using EnumerableSet for EnumerableSet.AddressSet;\n // Declare a set state variable\n EnumerableSet.AddressSet private mySet;\n }\n ```\n As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`\n (`UintSet`) are supported." }, "fullyImplemented": true, "id": 13904, "linearizedBaseContracts": [ 13904 ], "name": "EnumerableSet", "nodeType": "ContractDefinition", "nodes": [ { "canonicalName": "EnumerableSet.Set", "id": 13520, "members": [ { "constant": false, "id": 13515, "mutability": "mutable", "name": "_values", "nodeType": "VariableDeclaration", "overrides": null, "scope": 13520, "src": "1246:17:109", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_array$_t_bytes32_$dyn_storage_ptr", "typeString": "bytes32[]" }, "typeName": { "baseType": { "id": 13513, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "1246:7:109", 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"typeString": "mapping(bytes32 => uint256)" }, "valueType": { "id": 13517, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1417:7:109", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, "value": null, "visibility": "internal" } ], "name": "Set", "nodeType": "StructDefinition", "scope": 13904, "src": "1192:249:109", "visibility": "public" }, { "body": { "id": 13560, "nodeType": "Block", "src": "1680:335:109", "statements": [ { "condition": { "argumentTypes": null, "id": 13534, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "!", "prefix": true, "src": "1694:22:109", "subExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 13531, "name": "set", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13523, "src": "1705:3:109", "typeDescriptions": { "typeIdentifier": "t_struct$_Set_$13520_storage_ptr", 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storage ref" } }, "id": 13539, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "push", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1732:16:109", "typeDescriptions": { "typeIdentifier": "t_function_arraypush_nonpayable$_t_bytes32_$returns$__$", "typeString": "function (bytes32)" } }, "id": 13541, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1732:23:109", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 13542, "nodeType": "ExpressionStatement", "src": "1732:23:109" }, { "expression": { "argumentTypes": null, "id": 13551, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 13543, "name": "set", 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O(1).\n Returns true if the value was added to the set, that is if it was not\n already present." }, "id": 13561, "implemented": true, "kind": "function", "modifiers": [], "name": "_add", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 13526, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 13523, "mutability": "mutable", "name": "set", "nodeType": "VariableDeclaration", "overrides": null, "scope": 13561, "src": "1625:15:109", "stateVariable": false, "storageLocation": "storage", "typeDescriptions": { "typeIdentifier": "t_struct$_Set_$13520_storage_ptr", "typeString": "struct EnumerableSet.Set" }, "typeName": { "contractScope": null, "id": 13522, "name": "Set", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 13520, "src": "1625:3:109", "typeDescriptions": { "typeIdentifier": "t_struct$_Set_$13520_storage_ptr", "typeString": "struct EnumerableSet.Set" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 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