Object Oriented Programming

OOP

Comprehension

• 一些多态特征（不是全部）

  抽象：对象包含数据和行为 Objects Contain Data and Behavior

  封装：隐藏实现细节的封装 Encapsulation that Hides Implementation Details

  继承：继承作为类型系统和代码共享的方式 Inheritance as a Type System and as Code Sharing

• trait object

  Box 是 trait object，Rust 需要在运行时解析，会消耗一定的性能 —— 尽量不要使用

  pub trait Draw {
      fn draw(&self);
  }
  // trait object
  pub struct Screen {
      pub components: Vec<Box<dyn Draw>>,
  }
  impl Screen {
      pub fn run(&self) {
          for component in self.components.iter() {
              component.draw();
          }
      }
  }
  // generic type + trait buond
  pub struct Screen<T: Draw> {
      pub components: Vec<T>,
  }
  impl<T> Screen<T>
  where
      T: Draw,
  {
      pub fn run(&self) {
          for component in self.components.iter() {
              component.draw();
          }
      }
  }
  

Origin

https://doc.rust-lang.org/book/ch17-00-oop.html