65 lines
1.3 KiB
Rust
65 lines
1.3 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(box_syntax)]
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trait noisy {
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fn speak(&self);
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}
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struct cat {
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meows : uint,
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how_hungry : int,
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name : String,
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}
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impl cat {
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pub fn eat(&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 noisy for cat {
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fn speak(&self) { self.meow(); }
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}
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impl cat {
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fn meow(&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 : uint, in_y : int, 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 main() {
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let nyan: Box<noisy> = box cat(0, 2, "nyan".to_string()) as Box<noisy>;
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nyan.eat(); //~ ERROR does not implement any method in scope named `eat`
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}
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