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code

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closure-lifetime.rs

struct CallbackHolder<'a> {
  callbacks: Vec<&'a Fn()>,
}

impl<'a> CallbackHolder<'a> {
  fn new() -> CallbackHolder<'a> {
    return CallbackHolder{callbacks: vec![]};
  }

  fn register(&mut self, f: &'a Fn()) {
    self.callbacks.push(f);
  }

  fn pump(&mut self) {
    while let Some(f) = self.callbacks.pop() {
      f();
    }
  }
}

fn main() {
  let mut holder = CallbackHolder::new();
  let c = &|| {
    println!("hello from a callback!");
  };
  holder.register(c);
  holder.pump();
}