预期'(‘但在第10行中有标识符’‘
预期'(‘但在第10行中有标识符’‘
提问于 2022-05-09 04:12:51
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;
library Groups {
struct Group {
mapping(address => bool) members;
function addMember( Group storage self, address addr ) public returns (bool) { // error
if(self.members[addr]) {
return false;
}
self.members[addr] = true;
return true;
}
function delMember( Group storage self, address addr ) public returns (bool) {
if(self.members[addr]) {
return false;
}
self.members[addr] = false;
return true;
}
}
}回答 3
Ethereum用户
发布于 2022-05-09 05:06:21
if(self.members[addr] == true) {
...
}Ethereum用户
发布于 2022-05-09 05:10:12
为什么不：
mapping(address => bool) members;
function addMember(address _address) public {
require(members[_address] == false, "Member is already listed");
members[_address] == true;
}
function removeMember(address _address) public {
require(members[_address] == true, "Address is already out");
members[_address] == true;
}
function memberStatus(address _address) public returns(bool){
return members[_address];
}Ethereum用户
发布于 2022-05-09 07:24:50
请在编写函数之前关闭结构，不要在struct中添加函数，这可能会有所帮助
pragma solidity ^0.8.0;
library Groups {
struct Group {
mapping(address => bool) members;
}
function addMember( Group storage self, address addr ) public returns (bool) { // error
if(self.members[addr]) {
return false;
}
self.members[addr] = true;
return true;
}
function delMember( Group storage self, address addr ) public returns (bool) {
if(self.members[addr]) {
return false;
}
self.members[addr] = false;
return true;
}
}页面原文内容由Ethereum提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://ethereum.stackexchange.com/questions/127842
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