Function std::iter::successors
1.34.0 · source · [−]pub fn successors<T, F>(first: Option<T>, succ: F) -> Successors<T, F>ⓘNotable traits for Successors<T, F>impl<T, F> Iterator for Successors<T, F> where
F: for<'_> FnMut(&T) -> Option<T>, type Item = T; where
F: for<'_> FnMut(&T) -> Option<T>, Expand description
Creates a new iterator where each successive item is computed based on the preceding one.
The iterator starts with the given first item (if any)
and calls the given FnMut(&T) -> Option<T> closure to compute each item’s successor.
use std::iter::successors;
let powers_of_10 = successors(Some(1_u16), |n| n.checked_mul(10));
assert_eq!(powers_of_10.collect::<Vec<_>>(), &[1, 10, 100, 1_000, 10_000]);