{ "fileName": "SafeCast.sol", "contractName": "SafeCast", "source": "pragma solidity ^0.6.0;\n\n\n/**\n * @dev Wrappers over Solidity's uintXX casting operators with added overflow\n * checks.\n *\n * Downcasting from uint256 in Solidity does not revert on overflow. This can\n * easily result in undesired exploitation or bugs, since developers usually\n * assume that overflows raise errors. `SafeCast` restores this intuition by\n * reverting the transaction when such an operation overflows.\n *\n * Using this library instead of the unchecked operations eliminates an entire\n * class of bugs, so it's recommended to use it always.\n *\n * Can be combined with {SafeMath} to extend it to smaller types, by performing\n * all math on `uint256` and then downcasting.\n */\nlibrary SafeCast {\n\n /**\n * @dev Returns the downcasted uint128 from uint256, reverting on\n * overflow (when the input is greater than largest uint128).\n *\n * Counterpart to Solidity's `uint128` operator.\n *\n * Requirements:\n *\n * - input must fit into 128 bits\n */\n function toUint128(uint256 value) internal pure returns (uint128) {\n require(value < 2**128, \"SafeCast: value doesn\\'t fit in 128 bits\");\n return uint128(value);\n }\n\n /**\n * @dev Returns the downcasted uint64 from uint256, reverting on\n * overflow (when the input is greater than largest uint64).\n *\n * Counterpart to Solidity's `uint64` operator.\n *\n * Requirements:\n *\n * - input must fit into 64 bits\n */\n function toUint64(uint256 value) internal pure returns (uint64) {\n require(value < 2**64, \"SafeCast: value doesn\\'t fit in 64 bits\");\n return uint64(value);\n }\n\n /**\n * @dev Returns the downcasted uint32 from uint256, reverting on\n * overflow (when the input is greater than largest uint32).\n *\n * Counterpart to Solidity's `uint32` operator.\n *\n * Requirements:\n *\n * - input must fit into 32 bits\n */\n function toUint32(uint256 value) internal pure returns (uint32) {\n require(value < 2**32, \"SafeCast: value doesn\\'t fit in 32 bits\");\n return uint32(value);\n }\n\n /**\n * @dev Returns the downcasted uint16 from uint256, reverting on\n * overflow (when the input is greater than largest uint16).\n *\n * Counterpart to Solidity's `uint16` operator.\n *\n * Requirements:\n *\n * - input must fit into 16 bits\n */\n function toUint16(uint256 value) internal pure returns (uint16) {\n require(value < 2**16, \"SafeCast: value doesn\\'t fit in 16 bits\");\n return uint16(value);\n }\n\n /**\n * @dev Returns the downcasted uint8 from uint256, reverting on\n * overflow (when the input is greater than largest uint8).\n *\n * Counterpart to Solidity's `uint8` operator.\n *\n * Requirements:\n *\n * - input must fit into 8 bits.\n */\n function toUint8(uint256 value) internal pure returns (uint8) {\n require(value < 2**8, \"SafeCast: value doesn\\'t fit in 8 bits\");\n return uint8(value);\n }\n\n /**\n * @dev Converts a signed int256 into an unsigned uint256.\n *\n * Requirements:\n *\n * - input must be greater than or equal to 0.\n */\n function toUint256(int256 value) internal pure returns (uint256) {\n require(value >= 0, \"SafeCast: value must be positive\");\n return uint256(value);\n }\n\n /**\n * @dev Converts an unsigned uint256 into a signed int256.\n *\n * Requirements:\n *\n * - input must be less than or equal to maxInt256.\n */\n function toInt256(uint256 value) internal pure returns (int256) {\n require(value < 2**255, \"SafeCast: value doesn't fit in an int256\");\n return int256(value);\n }\n}\n", "sourcePath": "contracts/utils/SafeCast.sol", "sourceMap": "689:3029:106:-:0;;132:2:-1;166:7;155:9;146:7;137:37;255:7;249:14;246:1;241:23;235:4;232:33;222:2;;269:9;222:2;293:9;290:1;283:20;323:4;314:7;306:22;347:7;338;331:24", "deployedSourceMap": "689:3029:106:-:0;;;;;;12:1:-1;9;2:12", "abi": [], "ast": { "absolutePath": "contracts/utils/SafeCast.sol", "exportedSymbols": { "SafeCast": [ 15356 ] }, "id": 15357, "nodeType": "SourceUnit", "nodes": [ { "id": 15195, "literals": [ "solidity", "^", "0.6", ".0" ], "nodeType": "PragmaDirective", "src": "0:23:106" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": { "id": 15196, "nodeType": "StructuredDocumentation", "src": "26:662:106", "text": "@dev Wrappers over Solidity's uintXX casting operators with added overflow\nchecks.\n * Downcasting from uint256 in Solidity does not revert on overflow. This can\neasily result in undesired exploitation or bugs, since developers usually\nassume that overflows raise errors. `SafeCast` restores this intuition by\nreverting the transaction when such an operation overflows.\n * Using this library instead of the unchecked operations eliminates an entire\nclass of bugs, so it's recommended to use it always.\n * Can be combined with {SafeMath} to extend it to smaller types, by performing\nall math on `uint256` and then downcasting." }, "fullyImplemented": true, "id": 15356, "linearizedBaseContracts": [ 15356 ], "name": "SafeCast", "nodeType": "ContractDefinition", "nodes": [ { "body": { "id": 15218, "nodeType": "Block", "src": "1064:115:106", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 15209, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": 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