# 元组结构体定义 Basic usage: ``` struct Color(i32, i32, i32); let color = Color(0, 1, 2); assert_eq!(color.0, 0); assert_eq!(color.1, 1); assert_eq!(color

# 枚举类型： like C Basic usage: ``` enum Color { Red = 0xff0000, Green = 0x00ff00, Blue = 0x0000ff, } println!("roses are #{:06x}", Color::Red as i32);

# 单元结构体 Basic usage: ``` struct Empty; // 等价于 struct Empty {} struct RangeFull; // 标准库源码中RangeFull就是一个单元结构体 assert_eq!((..), std::ops::RangeFull);

# trait示例 Basic usage: ``` pub trait Fly { fn fly(&self) -> bool; } struct Duck; struct Pig; impl Fly for Duck { fn fly(&self) -> bool { return true

# 元组结构体：NewType模式 Basic usage: ``` struct Integer(u32); type Int = i32; // 为i32类型创建别名Int let int = Integer(10); assert_eq!(int.0, 10); let int: Int

# 枚举类型： 带参数 Basic usage: ``` enum IpAddr { V4(u8, u8, u8, u8), V6(String), } let f : fn(u8, u8, u8, u8) -> IpAddr = IpAddr::V4; let ff : fn(String)

# 枚举类型：Option Basic usage: ``` enum Option{ Some(i32), None, } let s = Some(42); assert_eq!(s.unwrap(), 42); match s { Some(n) => println!("num is:

# 枚举类型： 无参数 Basic usage: ``` enum Number { Zero, One, Two, } let a = Number::One; match a { Number::Zero => println!("0"), Number::One => println!("

# std::option::Option 定义 Basic usage: ``` use std::fmt::Debug; fn match_option<T: Debug>(o: Option<T>) { match o { Some(i) => println!("{:?}", i), N

# std::result::Result 定义 Basic usage: ``` let x: Result<i32, &str> = Ok(-3); assert_eq!(x.is_ok(), true); let x: Result<i32, &str> = Err("Some erro