Rust学习───trait

什么是trait？如果了解Java语言的话，你就可以把trait理解为Java的interface接口

• 定义

  pub trait Summarizable 
  {
       fn summary(&self) -> String;
  }
  
  

• 定义struct

  pub struct NewsArticle 
  {
      pub headline: String,
      pub location: String,
      pub author: String,
      pub content: String
  }
  
  
  

• 实现trait

  impl Summarizable for NewsArticle 
  {
      fn summary(&self) -> String {
      format!("{}, by {} ({})", self.headline, self.author, self.location)
  }
  
  

• 调用

  fn main() {
      let article = NewsArticle {
          headline: String::from("headline"),
          location: String::from("location"),
          author: String::from("author"),
          content: String::from("content"),
      };
  
      println!("{}", article.summary());
  }
  
  
  

这里 NewsArticle 的实例就有了Summarizable定义的summary的方法了。
详细关于trait的使用请参考参考链接参考链接