mirror of https://github.com/rust-lang/rust
64 lines
1.2 KiB
Rust
64 lines
1.2 KiB
Rust
//@ run-pass
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#![allow(dead_code)]
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#![allow(non_camel_case_types)]
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use std::fmt;
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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 cat {
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pub fn speak(&mut self) { self.meow(); }
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pub fn eat(&mut self) -> bool {
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if self.how_hungry > 0 {
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println!("OM NOM NOM");
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self.how_hungry -= 2;
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return true;
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}
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else {
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println!("Not hungry!");
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return false;
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}
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}
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}
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impl cat {
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fn meow(&mut self) {
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println!("Meow");
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self.meows += 1;
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if self.meows % 5 == 0 {
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self.how_hungry += 1;
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}
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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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impl fmt::Display for cat {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", self.name)
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}
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}
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fn print_out(thing: Box<dyn ToString>, expected: String) {
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let actual = (*thing).to_string();
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println!("{}", actual);
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assert_eq!(actual.to_string(), expected);
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}
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pub fn main() {
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let nyan: Box<dyn ToString> = Box::new(cat(0, 2, "nyan".to_string())) as Box<dyn ToString>;
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print_out(nyan, "nyan".to_string());
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}
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