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Deque: add try_push_back/try_push_front methods #17

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Deque: add try_push_back/try_push_front methods #17

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18 changes: 18 additions & 0 deletions src/deque.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -114,6 +114,24 @@ impl<T: Default + Copy + Clone + Pod + Zeroable, const MAX_SIZE: usize> Deque<T,
self.sequence_number += 1;
}

pub fn try_push_back(&mut self, node: T) -> Result<(), &'static str> {
if self.len() < MAX_SIZE {
self.push_back(node);
Ok(())
} else {
Err("Deque::try_push_back failed. Deque is at max capacity.")
}
}

pub fn try_push_front(&mut self, node: T) -> Result<(), &'static str> {
if self.len() < MAX_SIZE {
self.push_front(node);
Ok(())
} else {
Err("Deque::try_push_front failed. Deque is at max capacity.")
}
}

pub fn pop_front(&mut self) -> Option<T> {
if self.head == SENTINEL {
return None;
Expand Down