我正在尝试获取random numbers,并且在同一合同中也使用chainlink alarm。为此,我想使用实体的多重继承功能。使用以下代码片段:
pragma solidity ^0.6.2;
import "https://raw.githubusercontent.com/smartcontractkit/chainlink/develop/evm-contracts/src/v0.6/VRFConsumerBase.sol";
//import "github.com/smartcontractkit/chainlink/evm-contracts/src/v0.6/ChainlinkClient.sol";
contract Lottery is VRFConsumerBase, ChainlinkClient {
在remix中对此进行测试,出现以下错误:
browser/lottery4.sol:6:38: DeclarationError: Identifier not found or not unique.
contract Lottery is VRFConsumerBase, ChainlinkClient {
^-------------^
我尝试过混合导入和继承顺序,但是没有运气。我只能假定它与导入有关。
当我取消评论第二次导入时,即:
import "https://raw.githubusercontent.com/smartcontractkit/chainlink/develop/evm-contracts/src/v0.6/VRFConsumerBase.sol";
import "github.com/smartcontractkit/chainlink/evm-contracts/src/v0.6/ChainlinkClient.sol";
我得到以下错误,我仅假设是由于继承。
browser/lottery4.sol:4:1: DeclarationError: Identifier already declared.
import "github.com/smartcontractkit/chainlink/evm-contracts/src/v0.6/ChainlinkClient.sol";
^----------------------------------------------------------------------------------------^
https://raw.githubusercontent.com/smartcontractkit/chainlink/develop/evm-contracts/src/v0.6/interfaces/LinkTokenInterface.sol:3:1: The previous declaration is here:
interface LinkTokenInterface {
^ (Relevant source part starts here and spans across multiple lines).
我想念什么?