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。
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
