update at 2020-09-02 18:08:02 by ehlxr
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parent
24cb5393e6
commit
af12dad539
82
src/main.rs
82
src/main.rs
@ -344,13 +344,13 @@ fn main() {
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// .filter(|x| x % 3 == 0)
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.sum();
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println!("Counter sum: {}", sum);
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let mut zip = Counter::new().zip(Counter::new());
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let mut zip = Counter::new().zip(Counter::new());
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println!("{:?}",zip.next().unwrap());
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println!("{:?}",zip.next().unwrap());
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println!("{:?}",zip.next().unwrap());
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println!("{:?}",zip.next().unwrap());
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println!("{:?}",zip.next().unwrap());
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println!("{:?}", zip.next().unwrap());
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println!("{:?}", zip.next().unwrap());
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println!("{:?}", zip.next().unwrap());
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println!("{:?}", zip.next().unwrap());
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println!("{:?}", zip.next().unwrap());
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// ---------------------------
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println!("----------------------------------------");
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@ -1632,6 +1632,45 @@ impl Iterator for Counter {
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}
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}
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pub trait Messenger {
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fn send(&self, msg: &str);
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}
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pub struct LimitTracker<'a, T: Messenger> {
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messenger: &'a T,
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value: usize,
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max: usize,
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}
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impl<'a, T> LimitTracker<'a, T>
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where
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T: Messenger,
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{
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pub fn new(messenger: &'a T, max: usize) -> LimitTracker<T> {
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LimitTracker {
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messenger,
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value: 0,
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max,
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}
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}
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pub fn set_value(&mut self, value: usize) {
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self.value = value;
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let percentage_of_max = self.value as f64 / self.max as f64;
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if percentage_of_max >= 1.0 {
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self.messenger.send("Error: You are over your quota!");
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} else if percentage_of_max >= 0.9 {
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self.messenger
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.send("Urgent warning: You've used up over 90% of your quota!");
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} else if percentage_of_max >= 0.75 {
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self.messenger
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.send("Warning: You've used up over 75% of your quota!");
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}
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}
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}
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#[cfg(test)]
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mod tests {
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#[test]
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@ -1687,4 +1726,35 @@ mod tests {
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assert_eq!(total, 6);
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}
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struct MockMessenger {
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// sent_messages: Vec<String>,
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sent_messages: RefCell<Vec<String>>,
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}
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impl MockMessenger {
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fn new() -> MockMessenger {
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MockMessenger {
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// sent_messages: vec![],
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sent_messages: RefCell::new(vec![]),
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}
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}
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}
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impl Messenger for MockMessenger {
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fn send(&self, message: &str) {
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self.sent_messages.borrow_mut().push(String::from(message));
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}
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}
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#[test]
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fn it_sends_an_over_75_percent_warning_message() {
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let mock_messenger = MockMessenger::new();
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let mut limit_tracker = LimitTracker::new(&mock_messenger, 100);
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limit_tracker.set_value(80);
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// assert_eq!(mock_messenger.sent_messages.len(), 1);
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assert_eq!(mock_messenger.sent_messages.borrow().len(), 1);
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}
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}
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