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  1. use std::borrow::Cow;
  2. use std::fmt;
  3.  
  4. enum Color {
  5.     Red,
  6.     Green,
  7.     Blue,
  8.     Rgb { r: u8, g: u8, b: u8 },
  9. }
  10.  
  11. impl Color {
  12.     fn to_str(&self) -> Cow<str> {
  13.         use Color::*;
  14.         match *self {
  15.             Red => "#FF0000".into(),
  16.             Green => "#00FF00".into(),
  17.             Blue => "#0000FF".into(),
  18.             Rgb { r, g, b } => format!("#{:02X}{:02X}{:02X}", r, g, b).into(),
  19.         }
  20.     }
  21. }
  22.  
  23. impl fmt::Display for Color {
  24.     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  25.         f.write_str(&self.to_str())
  26.     }
  27. }
  28.  
  29. fn main() {
  30.     let color = Color::Rgb {
  31.         r: 255,
  32.         g: 255,
  33.         b: 255,
  34.     };
  35.     println!("{}", color);
  36. }
  37.  
Success #stdin #stdout 0s 4524KB
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#FFFFFF
https://ideone.com/UPBv5v
language:
Rust (rust 1.56)
created:
4 years ago
visibility:
secret

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