{
    "Function": "calculateCrossReserveReturn",
    "File": "contracts/bancor/BancorFormula.sol",
    "Parent Contracts": [],
    "High-Level Calls": [
        "SafeMath",
        "SafeMath",
        "SafeMath",
        "SafeMath"
    ],
    "Internal Calls": [
        "require(bool)",
        "power"
    ],
    "Library Calls": [
        "add",
        "add",
        "mul",
        "mul"
    ],
    "Low-Level Calls": [],
    "Code": "function calculateCrossReserveReturn(\n        uint256 _fromReserveBalance,\n        uint32 _fromReserveRatio,\n        uint256 _toReserveBalance,\n        uint32 _toReserveRatio,\n        uint256 _amount\n    ) public view returns (uint256) {\n        // validate input\n        require(\n            _fromReserveBalance > 0 &&\n                _fromReserveRatio > 0 &&\n                _fromReserveRatio <= MAX_RATIO &&\n                _toReserveBalance > 0 &&\n                _toReserveRatio > 0 &&\n                _toReserveRatio <= MAX_RATIO\n        );\n\n        // special case for equal ratios\n        if (_fromReserveRatio == _toReserveRatio)\n            return _toReserveBalance.mul(_amount) / _fromReserveBalance.add(_amount);\n\n        uint256 result;\n        uint8 precision;\n        uint256 baseN = _fromReserveBalance.add(_amount);\n        (result, precision) = power(baseN, _fromReserveBalance, _fromReserveRatio, _toReserveRatio);\n        uint256 temp1 = _toReserveBalance.mul(result);\n        uint256 temp2 = _toReserveBalance << precision;\n        return (temp1 - temp2) / result;\n    }"
}