mirror of https://github.com/rust-lang/rust
95 lines
1.6 KiB
Rust
95 lines
1.6 KiB
Rust
//@ run-pass
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#![allow(non_camel_case_types)]
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#![allow(dead_code)]
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trait noisy {
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fn speak(&mut self) -> isize;
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}
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struct dog {
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barks: usize,
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volume: isize,
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}
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impl dog {
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fn bark(&mut self) -> isize {
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println!("Woof {} {}", self.barks, self.volume);
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self.barks += 1_usize;
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if self.barks % 3_usize == 0_usize {
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self.volume += 1;
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}
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if self.barks % 10_usize == 0_usize {
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self.volume -= 2;
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}
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println!("Grrr {} {}", self.barks, self.volume);
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self.volume
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}
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}
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impl noisy for dog {
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fn speak(&mut self) -> isize {
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self.bark()
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}
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}
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fn dog() -> dog {
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dog {
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volume: 0,
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barks: 0_usize
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}
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}
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#[derive(Clone)]
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struct cat {
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meows: usize,
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how_hungry: isize,
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name: String,
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}
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impl noisy for cat {
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fn speak(&mut self) -> isize {
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self.meow() as isize
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}
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}
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impl cat {
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pub fn meow_count(&self) -> usize {
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self.meows
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}
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}
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impl cat {
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fn meow(&mut self) -> usize {
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println!("Meow");
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self.meows += 1_usize;
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if self.meows % 5_usize == 0_usize {
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self.how_hungry += 1;
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}
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self.meows
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}
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}
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fn cat(in_x: usize, in_y: isize, in_name: String) -> cat {
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cat {
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meows: in_x,
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how_hungry: in_y,
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name: in_name
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}
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}
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fn annoy_neighbors(critter: &mut dyn noisy) {
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for _i in 0_usize..10 { critter.speak(); }
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}
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pub fn main() {
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let mut nyan: cat = cat(0_usize, 2, "nyan".to_string());
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let mut whitefang: dog = dog();
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annoy_neighbors(&mut nyan);
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annoy_neighbors(&mut whitefang);
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assert_eq!(nyan.meow_count(), 10_usize);
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assert_eq!(whitefang.volume, 1);
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}
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