Enumeration colors - functions and str
- This example is similar, but instead of storing owned string we are using str in the enum.
examples/enums/colors-with-functions-using-str/src/main.rs
#[derive(Debug, PartialEq)] #[allow(dead_code)] enum Color<'a> { Red, Green, Blue, White, Black, Other(&'a str), } fn to_rgb<'a>(color: &'a Color) -> &'a str { return match color { Color::Black => "000000", Color::Red => "ff0000", Color::Green => "00ff00", Color::Blue => "0000ff", Color::White => "ffffff", &Color::Other(val) => val, } } fn from_rgb(rgb: &str) -> Color { return match rgb { "000000" => Color::Black, "ff0000" => Color::Red, "00ff00" => Color::Green, "0000ff" => Color::Blue, "ffffff" => Color::White, val => Color::Other(val), } } fn main() { let background = Color::Black; let foreground = Color::White; let ink = Color::Black; let sky = Color::Blue; let other = Color::Other("4674b9"); let experiment = from_rgb("ab89e2"); println!("{}", background == foreground); println!("{}", background == ink); println!(); for color in [background, foreground, ink, sky, other, experiment] { println!("{} {:?}", to_rgb(&color), color); } }
false true 000000 Black ffffff White 000000 Black 0000ff Blue 4674b9 Other("4674b9") ab89e2 Other("ab89e2")