{
    "Function": "slitherConstructorConstantVariables",
    "File": "contracts/v1/EIP2612.sol",
    "Parent Contracts": [
        "contracts/v1/EIP712Domain.sol",
        "contracts/v1/AbstractFiatTokenV1.sol",
        "contracts/util/IERC20.sol"
    ],
    "High-Level Calls": [],
    "Internal Calls": [],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "abstract contract EIP2612 is AbstractFiatTokenV1, EIP712Domain {\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\")\n    bytes32 public constant PERMIT_TYPEHASH =\n        0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\n\n    mapping(address => uint256) private _permitNonces;\n\n    /**\n     * @notice Nonces for permit\n     * @param owner Token owner's address (Authorizer)\n     * @return Next nonce\n     */\n    function nonces(address owner) external view returns (uint256) {\n        return _permitNonces[owner];\n    }\n\n    /**\n     * @notice Verify a signed approval permit and execute if valid\n     * @param owner     Token owner's address (Authorizer)\n     * @param spender   Spender's address\n     * @param value     Amount of allowance\n     * @param deadline  The time at which this expires (unix time)\n     * @param v         v of the signature\n     * @param r         r of the signature\n     * @param s         s of the signature\n     */\n    function _permit(\n        address owner,\n        address spender,\n        uint256 value,\n        uint256 deadline,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    ) internal {\n        require(deadline >= block.timestamp, \"EIP2612: permit is expired\");\n\n        bytes memory data = abi.encode(\n            PERMIT_TYPEHASH,\n            owner,\n            spender,\n            value,\n            _permitNonces[owner]++,\n            deadline\n        );\n        require(\n            EIP712.recover(_domainSeparatorV4(), v, r, s, data) == owner,\n            \"EIP2612: invalid signature\"\n        );\n\n        _approve(owner, spender, value);\n    }\n\n    uint256[50] private __gap;\n}"
}