{
    "Function": "calculateFundCost",
    "File": "contracts/bancor/BancorFormula.sol",
    "Parent Contracts": [],
    "High-Level Calls": [
        "SafeMath",
        "SafeMath",
        "SafeMath"
    ],
    "Internal Calls": [
        "require(bool)",
        "power"
    ],
    "Library Calls": [
        "mul",
        "mul",
        "add"
    ],
    "Low-Level Calls": [],
    "Code": "function calculateFundCost(\n        uint256 _supply,\n        uint256 _reserveBalance,\n        uint32 _totalRatio,\n        uint256 _amount\n    ) public view returns (uint256) {\n        // validate input\n        require(\n            _supply > 0 && _reserveBalance > 0 && _totalRatio > 1 && _totalRatio <= MAX_RATIO * 2\n        );\n\n        // special case for 0 amount\n        if (_amount == 0) return 0;\n\n        // special case if the total ratio = 100%\n        if (_totalRatio == MAX_RATIO) return (_amount.mul(_reserveBalance) - 1) / _supply + 1;\n\n        uint256 result;\n        uint8 precision;\n        uint256 baseN = _supply.add(_amount);\n        (result, precision) = power(baseN, _supply, MAX_RATIO, _totalRatio);\n        uint256 temp = ((_reserveBalance.mul(result) - 1) >> precision) + 1;\n        return temp - _reserveBalance;\n    }"
}