rust 结构体

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// 结构体定义
struct User {
    username: String,
    email: String,
    sign_in_count: u64,
    active: bool,
}
// 结构体实例化
let user1 = User {
    email: String::from("someone@example.com"),
    username: String::from("someusername123"),
    active: true,
    sign_in_count: 1,
};
// 初始化结构体的简洁写法
fn build_user(email: String, username: String) -> User {
    User {
        email,
        username,
        active: true,
        sign_in_count: 1,
    }
}
// 更新创建，创建 user2 其余值来自 user1
let user2 = User {
    email: String::from("another@example.com"),
    username: String::from("anotherusername567"),
    ..user1
};
// 元素访问
let x=user1.email;

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struct Color(i32, i32, i32);
struct Point(i32, i32, i32);

let black = Color(0, 0, 0);
let origin = Point(0, 0, 0);

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#[derive(Debug)] // debug 注解
struct Rectangle {
    width: u32,
    height: u32,
}

fn main() {
    let rect1 = Rectangle { width: 30, height: 50 };
    // {} 默认的 Display 输出 {:?} 格式化输出 {:#?} 展开的格式化输出
    println!("rect1 is {:?}", rect1);
}

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impl Rectangle {
    fn area(&self) -> u32 {
        self.width * self.height
    }

    fn can_hold(&self, other: &Rectangle) -> bool {
        self.width > other.width && self.height > other.height
    }
}