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Use successors #398

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Use successors #398

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9 changes: 2 additions & 7 deletions src/diff/stack.rs
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
use std::iter::successors;
use std::rc::Rc;

#[derive(Debug, Clone, Default, PartialEq, Eq)]
Expand Down Expand Up @@ -37,13 +38,7 @@ impl<T> Stack<T> {

// O(n)
pub fn size(&self) -> usize {
let mut res = 0;
let mut node = &self.head;
while let Some(next) = node {
res += 1;
node = &next.next;
}
res
successors(self.head.as_ref(), |node| node.next.as_ref()).count()
}

pub fn is_empty(&self) -> bool {
Expand Down