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SafeMath.sol
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SafeMath.sol
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/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error.
*/
library SafeMath {
// Multiplies two numbers, throws on overflow./
function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
if (a == 0) return 0;
c = a * b;
assert(c / a == b);
return c;
}
// Integer division of two numbers, truncating the quotient.
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
// Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
// Adds two numbers, throws on overflow.
function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
c = a + b;
assert(c >= a);
return c;
}
}