{
    "Function": "_update",
    "File": "contracts/contracts/Pair.sol",
    "Parent Contracts": [],
    "High-Level Calls": [],
    "Internal Calls": [
        "lastObservation"
    ],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function _update(uint balance0, uint balance1, uint _reserve0, uint _reserve1) internal {\n        uint blockTimestamp = block.timestamp;\n        uint timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired\n        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {\n            reserve0CumulativeLast += _reserve0 * timeElapsed;\n            reserve1CumulativeLast += _reserve1 * timeElapsed;\n        }\n\n        Observation memory _point = lastObservation();\n        timeElapsed = blockTimestamp - _point.timestamp; // compare the last observation with current timestamp, if greater than 30 minutes, record a new event\n        if (timeElapsed > periodSize) {\n            observations.push(Observation(blockTimestamp, reserve0CumulativeLast, reserve1CumulativeLast));\n        }\n        reserve0 = balance0;\n        reserve1 = balance1;\n        blockTimestampLast = blockTimestamp;\n        emit Sync(reserve0, reserve1);\n    }"
}