48 lines
856 B
Rust
48 lines
856 B
Rust
trait noisy {
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fn speak();
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}
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struct cat : noisy {
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priv {
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let mut meows : uint;
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fn meow() {
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error!("Meow");
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self.meows += 1u;
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if self.meows % 5u == 0u {
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self.how_hungry += 1;
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}
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}
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}
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let mut how_hungry : int;
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let name : ~str;
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new(in_x : uint, in_y : int, in_name: ~str)
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{ self.meows = in_x; self.how_hungry = in_y; self.name = in_name; }
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fn speak() { self.meow(); }
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fn eat() -> bool {
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if self.how_hungry > 0 {
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error!("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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error!("Not hungry!");
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return false;
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}
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}
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}
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fn make_speak<C: noisy>(c: C) {
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c.speak();
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}
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fn main() {
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let nyan = cat(0u, 2, ~"nyan");
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nyan.eat();
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assert(!nyan.eat());
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for uint::range(1u, 10u) |_i| { make_speak(nyan); };
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assert(nyan.eat());
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} |