4779878e27
...are now consistent with how we do it in contracts moved downcast helpers to Math clearer error names
36 lines
1.1 KiB
Solidity
36 lines
1.1 KiB
Solidity
pragma solidity 0.5.12;
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library Math {
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// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/2f9ae975c8bdc5c7f7fa26204896f6c717f07164/contracts/math/Math.sol#L17
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function min(uint256 a, uint256 b) internal pure returns (uint256) {
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return a < b ? a : b;
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}
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// https://github.com/ethereum/dapp-bin/pull/50
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// https://github.com/ethereum/dapp-bin/blob/11f05fc9e3f31a00d57982bc2f65ef2654f1b569/library/math.sol#L28
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function sqrt(uint256 x) internal pure returns (uint256 y) {
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if (x == 0) {
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y = 0;
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} else if (x <= 3) {
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y = 1;
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} else {
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y = x;
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uint256 z = (x + 1) / 2;
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while (z < y) {
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y = z;
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z = (x / z + z) / 2;
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}
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}
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}
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function downcastTo64(uint256 a) internal pure returns (uint64) {
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require(a <= uint64(-1), "Math: downcast overflow (uint256 to uint64)");
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return uint64(a);
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}
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function downcastTo128(uint256 a) internal pure returns (uint128) {
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require(a <= uint128(-1), "Math: downcast overflow (uint256 to uint128)");
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return uint128(a);
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}
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}
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