{
    "Function": "_writeCheckpoint",
    "File": "contracts/openzeppelin-solidity/contracts/token/ERC20/extensions/ERC20Votes.sol",
    "Parent Contracts": [
        "contracts/openzeppelin-solidity/contracts/token/ERC20/extensions/draft-ERC20Permit.sol",
        "contracts/openzeppelin-solidity/contracts/utils/cryptography/draft-EIP712.sol",
        "contracts/openzeppelin-solidity/contracts/token/ERC20/extensions/draft-IERC20Permit.sol",
        "contracts/openzeppelin-solidity/contracts/token/ERC20/ERC20.sol",
        "contracts/openzeppelin-solidity/contracts/token/ERC20/extensions/IERC20Metadata.sol",
        "contracts/openzeppelin-solidity/contracts/token/ERC20/IERC20.sol",
        "contracts/openzeppelin-solidity/contracts/utils/Context.sol",
        "contracts/openzeppelin-solidity/contracts/governance/utils/IVotes.sol"
    ],
    "High-Level Calls": [
        "SafeCast",
        "SafeCast",
        "SafeCast"
    ],
    "Internal Calls": [],
    "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        oldWeight = pos == 0 ? 0 : ckpts[pos - 1].votes;\n        newWeight = op(oldWeight, delta);\n\n        if (pos > 0 && ckpts[pos - 1].fromBlock == block.number) {\n            ckpts[pos - 1].votes = SafeCast.toUint224(newWeight);\n        } else {\n            ckpts.push(Checkpoint({fromBlock: SafeCast.toUint32(block.number), votes: SafeCast.toUint224(newWeight)}));\n        }\n    }"
}