Solidity案例详解（三）飞机管理合约

Roles角色合约（主要为后面的保险公司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];
    }
//查询添加的账户是否为空
 
    function add(Role storage role, address account) internal {
        require(!has(role, account), "Roles: account already has role");
        role.bearer[account] = true;
    }
//增加账户
    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;

首先声明两个事件（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);
    }

创建修饰器 onlyairlineV（限制访问权限时调用）

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

构造isairlineV函数判断是否具有airlineV角色

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

构造两个添加航空公司的函数，用于合约内部调用（_addairlineV）和外部调用（addairlineV）

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

构造一个合约内部删除函数（_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：输入账号，点击transact

使用部署的账号进行增加操作

如果使用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
文章来源：CSDN 博主「发呆...」
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