48-Solidity8.0-自毁合约

selfdestruct函数是智能合约自带的，它有两个功能

一是销毁合约，二是强制发送主币到一个地址；

源码：

pragma solidity ^0.8.7;

// selfdestruct
// - delete
// - force send Ether to any address

 contract Kill {
     constructor() payable {}

     function kill() external {
         selfdestruct(payable(msg.sender));
     }

     function testCall() external pure returns (uint) {
         return 123;
     }
 }

 contract Helper {
     function getBalance() external view returns (uint) {
         return address(this).balance;
     }

     function kill(Kill _kill) external {
         _kill.kill();
     }
 }