@aragon/apps-payroll
Version:
_**Code in Github:**_ [aragon-apps/apps/payroll](https://github.com/aragon/aragon-apps/tree/master/future-apps/payroll)
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JSON
{
"contractName": "SafeMath",
"abi": [],
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"source": "// See https://github.com/OpenZeppelin/openzeppelin-solidity/blob/d51e38758e1d985661534534d5c61e27bece5042/contracts/math/SafeMath.sol\n// Adapted to use pragma ^0.4.24 and satisfy our linter rules\n\npragma solidity ^0.4.24;\n\n\n/**\n * @title SafeMath\n * @dev Math operations with safety checks that revert on error\n */\nlibrary SafeMath {\n string private constant ERROR_ADD_OVERFLOW = \"MATH_ADD_OVERFLOW\";\n string private constant ERROR_SUB_UNDERFLOW = \"MATH_SUB_UNDERFLOW\";\n string private constant ERROR_MUL_OVERFLOW = \"MATH_MUL_OVERFLOW\";\n string private constant ERROR_DIV_ZERO = \"MATH_DIV_ZERO\";\n\n /**\n * @dev Multiplies two numbers, reverts on overflow.\n */\n function mul(uint256 _a, uint256 _b) internal pure returns (uint256) {\n // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\n // benefit is lost if 'b' is also tested.\n // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522\n if (_a == 0) {\n return 0;\n }\n\n uint256 c = _a * _b;\n require(c / _a == _b, ERROR_MUL_OVERFLOW);\n\n return c;\n }\n\n /**\n * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.\n */\n function div(uint256 _a, uint256 _b) internal pure returns (uint256) {\n require(_b > 0, ERROR_DIV_ZERO); // Solidity only automatically asserts when dividing by 0\n uint256 c = _a / _b;\n // assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold\n\n return c;\n }\n\n /**\n * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).\n */\n function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {\n require(_b <= _a, ERROR_SUB_UNDERFLOW);\n uint256 c = _a - _b;\n\n return c;\n }\n\n /**\n * @dev Adds two numbers, reverts on overflow.\n */\n function add(uint256 _a, uint256 _b) internal pure returns (uint256) {\n uint256 c = _a + _b;\n require(c >= _a, ERROR_ADD_OVERFLOW);\n\n return c;\n }\n\n /**\n * @dev Divides two numbers and returns the remainder (unsigned integer modulo),\n * reverts when dividing by zero.\n */\n function mod(uint256 a, uint256 b) internal pure returns (uint256) {\n require(b != 0, ERROR_DIV_ZERO);\n return a % b;\n }\n}\n",
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