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
}
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.AirlineV.sol 航空公司合约首先声明两个事件(增删账户)
// SPDX-License-Identifier: 3.0
pragma solidity ^0.8.20;
import "./Roles.sol";
contract AirlineV {
using Roles for Roles.Role;
Roles.Role private _airlineV;
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首先声明两个事件(增删账户)
event airlineVAdded(address account);
event airlineVRemoved(address account);
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初始化合约(构造函数)
constructor (address airlineV) {
_addairlineV(airlineV);
}
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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");
_;
}
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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);
}
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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);
}
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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);
}
}
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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...」
文章原标题:《solidity 案例详解(三)飞机管理合约》
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