22-Solidity8.0-结构体

源码：

pragma solidity ^0.8.7;


contract Structs{
    struct Car{
         string model;
        uint year;
        address owner;
    }

    Car public car;
    Car[] public cars;
    mapping(address => Car[]) public carsByOwner;

    function examples() external {
        Car memory toyota = Car("Toyota", 1990, msg.sender);
        Car memory lanbo = Car({year : 1980, model:"Lamborghini", owner: msg.sender});
        Car memory tesla;
        tesla.model = "Tesla";
        tesla.year = 2000;
        tesla.owner = msg.sender;

        cars.push(toyota);
        cars.push(lanbo);
        cars.push(tesla);

        cars.push(Car("Ferrari", 2020, msg.sender));

        Car storage _car = cars[0];
        _car.year = 1999;
        delete _car.owner;

        delete cars[1];
    }
}