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This can be used e.g. to track the number\n of elements in a mapping, issuing ERC721 ids, or counting request ids.\n Include with `using Counters for Counters.Counter;`" }, "fullyImplemented": true, "id": 22490, "linearizedBaseContracts": [ 22490 ], "name": "CountersUpgradeable", "nameLocation": "432:19:84", "nodeType": "ContractDefinition", "nodes": [ { "canonicalName": "CountersUpgradeable.Counter", "id": 22422, "members": [ { "constant": false, "id": 22421, "mutability": "mutable", "name": "_value", "nameLocation": "805:6:84", "nodeType": "VariableDeclaration", "scope": 22422, "src": "797:14:84", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 22420, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "797:7:84", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "name": "Counter", "nameLocation": "465:7:84", 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This can be used e.g. to track the number\n * of elements in a mapping, issuing ERC721 ids, or counting request ids.\n *\n * Include with `using Counters for Counters.Counter;`\n */\nlibrary CountersUpgradeable {\n struct Counter {\n // This variable should never be directly accessed by users of the library: interactions must be restricted to\n // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add\n // this feature: see https://github.com/ethereum/solidity/issues/4637\n uint256 _value; // default: 0\n }\n\n function current(Counter storage counter) internal view returns (uint256) {\n return counter._value;\n }\n\n function increment(Counter storage counter) internal {\n unchecked {\n counter._value += 1;\n }\n }\n\n function decrement(Counter storage counter) internal {\n uint256 value = counter._value;\n require(value > 0, \"Counter: decrement overflow\");\n unchecked {\n counter._value = value - 1;\n }\n }\n\n function reset(Counter storage counter) internal {\n counter._value = 0;\n }\n}\n", "sourceMap": "424:982:84:-:0;;;;;;;;;;;;;;;-1:-1:-1;;;424:982:84;;;;;;;;;;;;;;;;;", "sourcePath": "node_modules/@openzeppelin/contracts-upgradeable/utils/CountersUpgradeable.sol", "type": "library" }