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I have this code:

contract A {
    using SafeMath for uint;
    ...
}

contract B is A {
    ...
}

Does my contract B herits from "using SafeMath for uint;"?

1 Answer 1

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No, you have to declare library usage for every contract explicitly.

In case of SafeMath, you don't have to use it, if you use solidity 0.8.0 and after. Overflow/underflow checks are included in that versions. See https://docs.soliditylang.org/en/v0.8.9/080-breaking-changes.html :

Arithmetic operations revert on underflow and overflow. You can use unchecked { ... } to use the previous wrapping behaviour.

Checks for overflow are very common, so we made them the default to increase readability of code, even if it comes at a slight increase of gas costs.

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