Rust 编程视频教程对应讲解内容-方法

视频地址

头条地址:https://www.ixigua.com/i6765442674582356483
B站地址:https://www.bilibili.com/video/av78062009?p=1
网易云课堂地址:https://study.163.com/course/introduction.htm?courseId=1209596906#/courseDetail?tab=1

讲解内容

1、rust中的方法类似于c++中类的成员函数。

2、方法例子

#[derive(Debug)]
struct Dog {
    name: String,
    weight: f32,
    height: f32,
}

impl Dog { //下面为实现方法
    fn get_name(&self) -> &str{
        &(self.name[..])
    }

    fn get_weight(&self) -> f32 {
        self.weight
    }

    fn get_height(&self) -> f32 {
        self.height
    }
}

fn main() {
    let dog = Dog{name: String::from("jack"), weight:20.5, height: 60.0};
    println!("name = {}", dog.get_name().to_string());
    println!("weight = {}", dog.get_weight());
    println!("height = {}", dog.get_height());
    println!("Hello, world!");
}

3、可以有多个impl块
上面的代码

impl Dog { //下面为实现方法
    fn get_name(&self) -> &str{
        &(self.name[..])
    }

    fn get_weight(&self) -> f32 {
        self.weight
    }

    fn get_height(&self) -> f32 {
        self.height
    }
}

还可以写为多个impl块,如下:

impl Dog { //下面为实现方法
    fn get_name(&self) -> &str{
        &(self.name[..])
    }
}

impl Dog { //下面为实现方法
    fn get_weight(&self) -> f32 {
        self.weight
    }
}

impl Dog { //下面为实现方法
    fn get_height(&self) -> f32 {
        self.height
    }
}

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