Solidity security: The Reentrancy Guard pattern

In this story, I focus on one of the pattern to protect against one of the main attacks: Reentrancy attack.

ReentrancyGuard prevents reentrant calls to a function.

By inheriting ReentrancyGuard, a contract can use the nonReentrant modifier, which ensures that a function cannot have nested (reentrant) calls to it.

There is one limitation: functions marked as nonReentrant cannot call each other.

Example

// SPDX-License-Identifier: GPL-3.0
pragma…