tests/ui/structs-enums/class-separate-impl.rs

   1 // run-pass
   2 #![allow(dead_code)]
   3 #![allow(non_camel_case_types)]
   4
   5 use std::fmt;
   6
   7 struct cat {
   8     meows : usize,
   9
  10     how_hungry : isize,
  11     name : String,
  12 }
  13
  14 impl cat {
  15     pub fn speak(&mut self) { self.meow(); }
  16
  17     pub fn eat(&mut self) -> bool {
  18         if self.how_hungry > 0 {
  19             println!("OM NOM NOM");
  20             self.how_hungry -= 2;
  21             return true;
  22         }
  23         else {
  24             println!("Not hungry!");
  25             return false;
  26         }
  27     }
  28 }
  29
  30 impl cat {
  31     fn meow(&mut self) {
  32         println!("Meow");
  33         self.meows += 1;
  34         if self.meows % 5 == 0 {
  35             self.how_hungry += 1;
  36         }
  37     }
  38 }
  39
  40 fn cat(in_x : usize, in_y : isize, in_name: String) -> cat {
  41     cat {
  42         meows: in_x,
  43         how_hungry: in_y,
  44         name: in_name
  45     }
  46 }
  47
  48 impl fmt::Display for cat {
  49     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  50         write!(f, "{}", self.name)
  51     }
  52 }
  53
  54 fn print_out(thing: Box<dyn ToString>, expected: String) {
  55   let actual = (*thing).to_string();
  56   println!("{}", actual);
  57   assert_eq!(actual.to_string(), expected);
  58 }
  59
  60 pub fn main() {
  61   let nyan: Box<dyn ToString> = Box::new(cat(0, 2, "nyan".to_string())) as Box<dyn ToString>;
  62   print_out(nyan, "nyan".to_string());
  63 }