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解决Safemath 库连接失效问题 #752

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解决Safemath 库连接失效问题 #752

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2 changes: 1 addition & 1 deletion S05_Overflow/readme.md
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Expand Up @@ -75,7 +75,7 @@ contract Token {

## 预防办法

1. Solidity `0.8.0` 之前的版本，在合约中引用 [Safemath 库](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/math/SafeMath.sol)，在整型溢出时报错。
1. Solidity `0.8.0` 之前的版本，在合约中引用 [Safemath 库](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/release-v4.9/contracts/utils/math/SafeMath.sol)，在整型溢出时报错。

2. Solidity `0.8.0` 之后的版本内置了 `Safemath`，因此几乎不存在这类问题。开发者有时会为了节省gas使用 `unchecked` 关键字在代码块中临时关闭整型溢出检测，这时要确保不存在整型溢出漏洞。

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