21 lines
736 B
Solidity
21 lines
736 B
Solidity
pragma solidity 0.5.12;
|
|
|
|
library Math {
|
|
// based on https://github.com/OpenZeppelin/openzeppelin-contracts/blob/2f9ae975c8bdc5c7f7fa26204896f6c717f07164/contracts/math/Math.sol#L17
|
|
function min(uint256 a, uint256 b) internal pure returns (uint256) {
|
|
return a < b ? a : b;
|
|
}
|
|
|
|
// based on https://github.com/ethereum/dapp-bin/blob/11f05fc9e3f31a00d57982bc2f65ef2654f1b569/library/math.sol#L28 via https://github.com/ethereum/dapp-bin/pull/50
|
|
function sqrt(uint256 x) internal pure returns (uint256 y) {
|
|
if (x == 0) return 0;
|
|
else if (x <= 3) return 1;
|
|
uint256 z = (x + 1) / 2;
|
|
y = x;
|
|
while (z < y) {
|
|
y = z;
|
|
z = (x / z + z) / 2;
|
|
}
|
|
}
|
|
}
|