mirror of https://github.com/rust-lang/rust.git
55 lines
887 B
Rust
55 lines
887 B
Rust
trait Noisy {
|
|
fn speak(&mut self);
|
|
}
|
|
|
|
struct Cat {
|
|
meows : usize,
|
|
|
|
how_hungry : isize,
|
|
name : String,
|
|
}
|
|
|
|
impl Cat {
|
|
pub fn eat(&mut self) -> bool {
|
|
if self.how_hungry > 0 {
|
|
println!("OM NOM NOM");
|
|
self.how_hungry -= 2;
|
|
return true;
|
|
}
|
|
else {
|
|
println!("Not hungry!");
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Noisy for Cat {
|
|
fn speak(&mut self) { self.meow(); }
|
|
|
|
}
|
|
|
|
impl Cat {
|
|
fn meow(&mut self) {
|
|
println!("Meow");
|
|
self.meows += 1;
|
|
if self.meows % 5 == 0 {
|
|
self.how_hungry += 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
fn cat(in_x : usize, in_y : isize, in_name: String) -> Cat {
|
|
Cat {
|
|
meows: in_x,
|
|
how_hungry: in_y,
|
|
name: in_name
|
|
}
|
|
}
|
|
|
|
|
|
|
|
fn main() {
|
|
let nyan: Box<dyn Noisy> = Box::new(cat(0, 2, "nyan".to_string())) as Box<dyn Noisy>;
|
|
nyan.eat(); //~ ERROR no method named `eat` found
|
|
}
|