{
    "Function": "_writeCheckpoint",
    "File": "contracts/lib/openzeppelin-contracts/contracts/mocks/token/ERC20VotesLegacyMock.sol",
    "Parent Contracts": [
        "contracts/lib/openzeppelin-contracts/contracts/token/ERC20/extensions/ERC20Permit.sol",
        "contracts/lib/openzeppelin-contracts/contracts/utils/cryptography/EIP712.sol",
        "contracts/lib/openzeppelin-contracts/contracts/interfaces/IERC5267.sol",
        "contracts/lib/openzeppelin-contracts/contracts/token/ERC20/extensions/IERC20Permit.sol",
        "contracts/lib/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol",
        "contracts/lib/openzeppelin-contracts/contracts/token/ERC20/extensions/IERC20Metadata.sol",
        "contracts/lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol",
        "contracts/lib/openzeppelin-contracts/contracts/utils/Context.sol",
        "contracts/lib/openzeppelin-contracts/contracts/governance/utils/IVotes.sol"
    ],
    "High-Level Calls": [
        "SafeCast",
        "SafeCast",
        "SafeCast"
    ],
    "Internal Calls": [
        "_unsafeAccess",
        "_unsafeAccess"
    ],
    "Library Calls": [
        "toUint224",
        "toUint224",
        "toUint32"
    ],
    "Low-Level Calls": [],
    "Code": "function _writeCheckpoint(\n        Checkpoint[] storage ckpts,\n        function(uint256, uint256) view returns (uint256) op,\n        uint256 delta\n    ) private returns (uint256 oldWeight, uint256 newWeight) {\n        uint256 pos = ckpts.length;\n\n        unchecked {\n            Checkpoint memory oldCkpt = pos == 0 ? Checkpoint(0, 0) : _unsafeAccess(ckpts, pos - 1);\n\n            oldWeight = oldCkpt.votes;\n            newWeight = op(oldWeight, delta);\n\n            if (pos > 0 && oldCkpt.fromBlock == block.number) {\n                _unsafeAccess(ckpts, pos - 1).votes = SafeCast.toUint224(newWeight);\n            } else {\n                ckpts.push(\n                    Checkpoint({fromBlock: SafeCast.toUint32(block.number), votes: SafeCast.toUint224(newWeight)})\n                );\n            }\n        }\n    }"
}