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This commit is contained in:
Noah Zinsmeister
2019-11-06 17:23:03 -05:00
parent 8cb70d07b2
commit 710adc3254
15 changed files with 399 additions and 315 deletions
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35
contracts/libraries/Math.sol
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@ -1,35 +1,18 @@
pragma solidity 0.5.12;
library Math {
// 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;
function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
return x <= y ? x : y;
}
// https://github.com/ethereum/dapp-bin/pull/50
// https://github.com/ethereum/dapp-bin/blob/11f05fc9e3f31a00d57982bc2f65ef2654f1b569/library/math.sol#L28
function sqrt(uint256 x) internal pure returns (uint256 y) {
if (x == 0) {
y = 0;
} else if (x <= 3) {
y = 1;
} else {
y = x;
uint256 z = (x + 1) / 2;
while (z < y) {
y = z;
z = (x / z + z) / 2;
}
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;
}
}
function downcastTo64(uint256 a) internal pure returns (uint64) {
require(a <= uint64(-1), "Math: downcast overflow (uint256 to uint64)");
return uint64(a);
}
function downcastTo128(uint256 a) internal pure returns (uint128) {
require(a <= uint128(-1), "Math: downcast overflow (uint256 to uint128)");
return uint128(a);
}
}