【Solidity学习笔记】异常处理

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

// Gas cost在Remix中测试得到 使用0.8.17版本编译
// 参数使用 tokenId = 123, address = {any address}

// 自定义error
error TransferNotOwner();

// error TransferNotOwner(address sender);

contract Errors {
    // 一组映射，记录每个TokenId的Owner
    mapping(uint256 => address) private _owners;

    // Error
    function transferOwner1(uint256 tokenId, address newOwner) public {
        if (_owners[tokenId] != msg.sender) {
            revert TransferNotOwner();
            // revert TransferNotOwner(msg.sender);
        }
        _owners[tokenId] = newOwner;
    }

    // require
    function transferOwner2(uint256 tokenId, address newOwner) public {
        require(_owners[tokenId] == msg.sender, "Transfer Not Owner");
        _owners[tokenId] = newOwner;
    }

    // assert
    function transferOwner3(uint256 tokenId, address newOwner) public {
        assert(_owners[tokenId] == msg.sender);
        _owners[tokenId] = newOwner;
    }
}