Dependencies.sol

// SPDX-License-Identifier: BSL-1.0 (Boost Software License 1.0)

//-------------------------------------------------------------------------------------//
// Copyright (c) 2022 - 2023 serial-coder: Phuwanai Thummavet (mr.thummavet@gmail.com) //
//-------------------------------------------------------------------------------------//

// For more info, please refer to my article:
//  - On Medium: https://medium.com/valixconsulting/solidity-security-by-example-09-denial-of-service-with-revert-814f55b61e02
//  - On serial-coder.com: https://www.serial-coder.com/post/solidity-smart-contract-security-by-example-09-denial-of-service-with-revert/

pragma solidity 0.8.19;

abstract contract ReentrancyGuard {
    bool internal locked;

    modifier noReentrant() {
        require(!locked, "No re-entrancy");
        locked = true;
        _;
        locked = false;
    }
}