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Results tagged with uint256
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user 84305
4
votes
Accepted
Why does uint 0 - 20 not cause an underflow?
That's because since solidity 0.8.0 the overflow / underflow are automatically checked :
"Arithmetic operations revert on underflow and overflow. You can use unchecked { ... } to use the previous wrap …
- 7,901
1
vote
Accepted
Where is the single-parameter version of function sub() defined in SafeMath?
The function you have seen in SafeMath.sol :
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
Is the one that is implicitly called with block.number.sub(1). … That is the case because SafeMath.sol is a library that is attached to the type uint256. …
- 7,901