solidity delegatecall使用

solidity delegatecall使用

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Callee {
    uint256 public value;

    function setValue(uint256 _newValue) public {
        value = _newValue;
    }
}

contract Caller {
    uint256 public value;

    /*
        1、调用delegateSetValue 状态变量value 会变成_newValue

    */
    function delegateSetValue(address callee, uint256 _newValue) public {
        // 对函数签名和参数进行编码
        bytes memory methodop = abi.encodeWithSignature(
            "setValue(uint256)",
            _newValue
        );

        (bool success, ) = callee.delegatecall(methodop);
        if(!success){
            revert("delegate call failed");
        }
    }
}