{ "contractName": "Counters", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.8.11+commit.d7f03943\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"author\":\"Matt Condon (@shrugs)\",\"details\":\"Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number of elements in a mapping, issuing ERC721 ids, or counting request ids. 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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 Counters {\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", "sourcePath": "@openzeppelin/contracts/utils/Counters.sol", "ast": { "absolutePath": "@openzeppelin/contracts/utils/Counters.sol", "exportedSymbols": { "Counters": [ 5371 ] }, "id": 5372, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 5299, "literals": [ "solidity", "^", "0.8", ".0" ], "nodeType": "PragmaDirective", "src": "87:23:28" }, { "abstract": false, "baseContracts": [], "canonicalName": "Counters", "contractDependencies": [], "contractKind": "library", "documentation": { "id": 5300, "nodeType": "StructuredDocumentation", "src": "112:311:28", "text": " @title Counters\n @author Matt Condon (@shrugs)\n @dev Provides counters that can only be incremented, decremented or reset. 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This can be used e.g. to track the number of elements in a mapping, issuing ERC721 ids, or counting request ids. Include with `using Counters for Counters.Counter;`", "kind": "dev", "methods": {}, "title": "Counters", "version": 1 }, "userdoc": { "kind": "user", "methods": {}, "version": 1 } }