Rust 装饰模式讲解和代码示例

装饰是一种结构设计模式，允许你通过将对象放入特殊封装对象中来为原对象增加新的行为。

由于目标对象和装饰器遵循同一接口，因此你可用装饰来对对象进行无限次的封装。结果对象将获得所有封装器叠加而来的行为。

进一步了解装饰模式

Input streams decoration

There is a practical example in Rust's standard library for input/output operations.

A buffered reader decorates a vector reader adding buffered behavior.

let mut input = BufReader::new(Cursor::new("Input data"));
input.read(&mut buf).ok();

main.rs

use std::io::{BufReader, Cursor, Read};

fn main() {
    let mut buf = [0u8; 10];

    // A buffered reader decorates a vector reader which wraps input data.
    let mut input = BufReader::new(Cursor::new("Input data"));

    input.read(&mut buf).ok();

    print!("Read from a buffered reader: ");

    for byte in buf {
        print!("{}", char::from(byte));
    }

    println!();
}

Output

Read from a buffered reader: Input data

装饰在其他编程语言中的实现