得到 parsererror 我在 remix 上写 inheritance solidity 代码我得到了错误

Question

从solidity：contracts/inheritance 添加两个contract.sol：32：1：ParserError：Function，变量，结构或修饰符声明预期。 合同 Mycontract 是 Ownable{ ^-----^

//代码杂注solidity ^0.6.0;

合约拥有{

地址公共所有者；

constructor( string memory _secret)public{
    owner = msg.sender;
}

modifier addcontract(string memory _secret){
    require(owner == msg.sender, "only owner can accesss");
    _;

}

}

合同秘密保险库{字符串秘密；

constructor() public{
    secret = _secret;

}

function getsecret() public view returns(string memory){
    return secret;

}

contract Mycontract is Ownable{ //错误在这一行

address vault;

constructor(string memory _secret)  public{
    secretvault _Vault = new Vault(_secret);
    secretvault = address(_Vault);
    super;

}
function getsecret() public view addcontract returns(string memory){
    secretvault _Vault = Vault(secretvault);
    return _Vault.getsecret();
}

}

Answer 1

如果您继承的合同期望 arguments 到它的构造函数，那么您应该在两个地方之一传递那些 arguments 像Ownable("secret value") ：

在这里，我们声明 inheritance：

contract MyContract is Ownable("secret value") {

    address vault;

    constructor(string memory _secret) public {
        secretvault _Vault = new Vault(_secret);
        secretvault = address(_Vault);
        super;
    }
    function getsecret() public view addcontract returns(string memory){
        secretvault _Vault = Vault(secretvault);
        return _Vault.getsecret();
    }
}

或者在子构造函数上：

contract MyContract is Ownable {

    address vault;

    constructor(string memory _secret) Ownable("secret value") public {
        secretvault _Vault = new Vault(_secret);
        secretvault = address(_Vault);
        super;
    }
    function getsecret() public view addcontract returns(string memory){
        secretvault _Vault = Vault(secretvault);
        return _Vault.getsecret();
    }
}

顺便说一句，我不确定您要做什么，或者您是否只是在玩一些概念，但是智能合约和区块链中没有“私人”或“秘密”数据之类的东西。 智能合约中的所有数据都可以直接从区块链访问，使用web.eth.getStorageAt(contractAddress, storageIndex)类的东西。

另外，我建议您在专门的社区中询问这些与 Ethereum/Solidity 相关的问题： https://ethereum.stackexchange.com/

顺便说一句，试图猜测您要做什么，我将您的代码重构为如下所示：

//code
pragma solidity ^0.6.0;

contract Ownable {

   address public owner;

    constructor() public {
        owner = msg.sender;
    }

    modifier onlyOwner() {
        require(owner == msg.sender, "Only owner can accesss");
        _;
    }
}

contract Vault {
    // There is nothing actually private in a smart contract or blockchain.
    string private secret;

    constructor(string memory _secret) public {
        secret = _secret;
    }

    function getSecret() public view returns(string memory){
        return secret;
    }
}

contract MyContract is Ownable {

    Vault vault;

    constructor(string memory _secret) public {
        vault = new Vault(_secret);
    }
    function getSecret() public view onlyOwner returns(string memory){
        return vault.getSecret();
    }
}

Answer 2

在secretvault智能合约声明中，您必须以这种方式在末尾（在getsecret()函数之后）关闭大括号：

contract secretvault { 
  string secret;

  constructor() public {
    secret = _secret;
  }

  function getsecret() public view returns(string memory){
    return secret;
  }

}