TypeError:函数调用中参数的类型无效

Question

我正在浏览AAVE v2闪存贷款文档，并尝试他们的闪存贷款锅炉板代码。我将编译器版本升级到了0.8.0。我收到以下错误消息

TypeError: Type contract ILendingPool is not implicitly convertible to expected type uint256.
--> contracts/MyFlashLoan.sol:36:46:
|
36 |            IERC20(assets[i]).approve(address[LENDING_POOL], amountOwing);
|                                              ^^^^^^^^^^^^

TypeError: Invalid type for argument in function call. Invalid implicit conversion from type(address[1] memory) to address requested.
--> contracts/MyFlashLoan.sol:36:38:
|
36 |            IERC20(assets[i]).approve(address[LENDING_POOL], amountOwing);
|                                      ^^^^^^^^^^^^^^^^^^^^^

Error HH600: Compilation failed

我试图编译的代码如下，

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;
import 'hardhat/console.sol';
import { FlashLoanReceiverBase } from './FlashLoanReceiverBase.sol';
import { ILendingPool } from './interfaces/ILendingPool.sol';
import { ILendingPoolAddressesProvider } from './interfaces/ILendingPoolAddressesProvider.sol';
import { IERC20 } from '@openzeppelin/contracts/token/ERC20/IERC20.sol';
contract MyFlashLoan is FlashLoanReceiverBase {

constructor(ILendingPoolAddressesProvider _addressProvider) 
FlashLoanReceiverBase(_addressProvider) {}
function executeOperation(
address[] calldata assets, 
uint256[] calldata amounts, 
uint256[] calldata premiums, 
address initiator, 
bytes calldata params
)
external 
override 
returns(bool)
{
// Flash Loan Code.
// Approve allowances for the lending pool to pull owed amounts
for( uint i = 0; i < assets.length;i++){
uint amountOwing = amounts[i].add(premiums[i]);
IERC20(assets[i]).approve(address[LENDING_POOL], amountOwing);
}
return true;
}
}

为什么我收到上述错误消息？我该如何纠正

Answer 1

您必须按以下方式键入强制转换以使其成为地址应付。

IERC20(assets[i]).approve(payable(address[LENDING_POOL]), amountOwing);

我认为，从0.8开始，您必须明确支付地址，因为您在进行转账之前明确批准了地址。