类型错误：修饰符调用中的参数类型无效

Question

问题摘要：

我在尝试调用

TypeError

合约中的修饰符时在代码中遇到了

flashloan.sol

。该错误消息表明修饰符调用中的参数类型无效，特别是正在请求从合约

IPoolAddressesProvider

到合约

IPoolAddressesProvider

的无效隐式转换。

重现步骤：

• 使用给定代码部署合约。
• 尝试调用

  flashloan.sol

  合约中的修改器。
• 请遵守错误消息中提到的

  TypeError

  。

预期行为：

代码应该编译没有任何错误，并且修饰符应该成功调用，没有类型转换问题。

实际行为：

遇到了

TypeError

，其详细信息如下：

TypeError: Invalid type for argument in modifier invocation. Invalid implicit conversion from contract IPoolAddressesProvider to contract IPoolAddressesProvider requested.
  --> contracts/flashloan.sol:13:35:
   |
13 |     ) FlashLoanSimpleReceiverBase(IPoolAddressesProvider(_addressProvider)) {
   |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

环境：

• Solidity 编译器版本：“0.8.10”
• 操作系统：Windows x64

我删除了从合约

IPoolAddressesProvider

到合约

IPoolAddressesProvider

的隐式类型转换

FlashLoanSimpleReceiverBase(_addressProvider)

还尝试使用

Remix Ide

修复代码，在花了很多时间使用

Hardhat

在本地修复它之后，但不幸的是没有结果，请告诉我如何修复它，谢谢！

闪贷.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import {FlashLoanSimpleReceiverBase} from "https://github.com/aave/aave-v3-core/contracts/flashloan/base/FlashLoanSimpleReceiverBase.sol";
import {IPoolAddressesProvider} from "@aave/core-v3/contracts/interfaces/IPoolAddressesProvider.sol";
import {IERC20} from "@aave/core-v3/contracts/dependencies/openzeppelin/contracts/IERC20.sol";

abstract contract FlashLoan is FlashLoanSimpleReceiverBase {
    address payable owner;

    constructor(
        address _addressProvider
    ) FlashLoanSimpleReceiverBase(IPoolAddressesProvider(_addressProvider)) {
        owner = payable(msg.sender);
    }

    function executeOperation(
        address[] calldata assets,
        uint256[] calldata amounts,
        uint256[] calldata premiums,
        address initiator,
        bytes calldata params
    ) external returns (bool){
        // We have the borrowed funds
        // custom logic to mock arbitrage
        uint256 amountOwed = amounts + premiums;
        IERC20(assets).approve(address(POOL),amountOwed);

    return true;
    }

    function requestFlashLoan(address _token, uint256 _amount) public {
        address receiverAddress = address(this);
        address asset = _token;
        uint256 amount = _amount;
        bytes memory params = ""; //empty
        uint16 referralCode = 0;

        POOL.flashLoanSimple(
            receiverAddress,
            asset,
            amount,
            params,
            referralCode
        );
    }

    function getBalance(address _tokenAddress) external view returns(uint256) {
        return IERC20(_tokenAddress).balanceOf(address(this));
    }

    function withdraw(address _tokenAddress) external onlyOwner{
        IERC20 token = IERC20(_tokenAddress);
        token.transfer(msg.sender, token.balanceOf(address(this)));
    }

    modifier onlyOwner() {
        require(msg.sender == owner, 
        "Only contract owner can call this function");
        _;
    }

    receive() external payable {}


}

Answer 1

问题是

IPoolAddressesProvider(_addressProvider)

不是

address

的类型，它应该是

_addressProvider

，而不是作为正确的类型传递。

这个模板演示了导入、构造函数和函数调用的格式。