rust/src/test/run-pass/class-implement-traits.rs

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