关于solidity:Solidity案例详解三飞机管理合约

Roles角色合约（次要为前面的保险公司C提供环境）

// SPDX-License-Identifier: 3.0 pragma solidity ^0.8.20; library Roles {    struct Role {        mapping (address => bool) bearer;    }     function has(Role storage role, address account) internal view returns (bool) {        require(account != address(0), "Roles: account is the zero address");        return role.bearer[account];    }//查问增加的账户是否为空     function add(Role storage role, address account) internal {        require(!has(role, account), "Roles: account already has role");        role.bearer[account] = true;    }//减少账户    function remove(Role storage role, address account) internal {        require(has(role, account), "Roles: account does not have role");        role.bearer[account] = false;    }//删除账户}

}.AirlineV.sol航空公司合约

// SPDX-License-Identifier: 3.0 pragma solidity ^0.8.20;   import "./Roles.sol"; contract AirlineV {    using  Roles for Roles.Role;    Roles.Role private  _airlineV;

首先申明两个事件（增删账户）

     event airlineVAdded(address account);     event airlineVRemoved(address account);

初始化合约（构造函数）

    constructor  (address airlineV) {        _addairlineV(airlineV);    }

创立润饰器 onlyairlineV（限度拜访权限时调用）

    modifier  onlyairlineV() {         require( isairlineV(msg.sender),"airlineVRole: caller does not have the airlineV role");         _;     }

结构isairlineV函数判断是否具备airlineV角色

function isairlineV(address account)public  view returns(bool){         return _airlineV.has(account);     }  

结构两个增加航空公司的函数，用于合约外部调用（_addairlineV）和内部调用（addairlineV）

 function _addairlineV(address account) internal {         _airlineV.add(account);         emit airlineVAdded(account);     }

结构一个合约外部删除函数（_removeairlineV）和用户自行退出函（renounceairlineV）

function addairlineV(address account) public onlyairlineV{    _addairlineV(account);} function _removeairlineV(address account) internal {    // _ai,.rlineV.remove(account);    emit airlineVRemoved(account);}function renounceairlineV() public {    _removeairlineV(msg.sender);}

}演示：输出账号，点击transact

应用部署的账号进行减少操作

如果应用oxAb8...则会报错

isairlineV进行判断账号是否为航空公司身份

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原文链接：https://blog.csdn.net/2302_77339802/article/details/131834020
文章起源：CSDN 博主「发愣...」
文章原题目：《solidity案例详解（三）飞机治理合约》旨在流传区块链相干技术，如有侵权请与咱们分割删除。