[−][src]Trait const_combinations::IterExt
An extension trait adding combinations
and permutations
to Iterator
.
Provided methods
pub fn combinations<const K: usize>(self) -> Combinations<Self, K>ⓘ
[src]
Return an iterator adaptor that iterates over the k-length combinations of the elements from an iterator.
The iterator produces a new array per iteration, and clones the iterator
elements. If K
is greater than the length of the input iterator the
resulting iterator adaptor will yield no items.
Examples
use const_combinations::IterExt; let mut combinations = (1..5).combinations(); assert_eq!(combinations.next(), Some([1, 2, 3])); assert_eq!(combinations.next(), Some([1, 2, 4])); assert_eq!(combinations.next(), Some([1, 3, 4])); assert_eq!(combinations.next(), Some([2, 3, 4])); assert_eq!(combinations.next(), None);
Note: Combinations does not take into account the equality of the iterated values.
let mut combinations = vec![1, 2, 2].into_iter().combinations(); assert_eq!(combinations.next(), Some([1, 2])); // Note: these are the same assert_eq!(combinations.next(), Some([1, 2])); // Note: these are the same assert_eq!(combinations.next(), Some([2, 2])); assert_eq!(combinations.next(), None);
pub fn permutations<const K: usize>(self) -> Permutations<Self, K>ⓘ
[src]
Return an iterator adaptor that iterates over the k-length permutations of the elements from an iterator.
The iterator produces a new array per iteration, and clones the iterator
elements. If K
is greater than the length of the input iterator the
resulting iterator adaptor will yield no items.
Examples
let mut permutations = (0..3).permutations(); assert_eq!(permutations.next(), Some([0, 1])); assert_eq!(permutations.next(), Some([1, 0])); assert_eq!(permutations.next(), Some([0, 2])); assert_eq!(permutations.next(), Some([2, 0])); assert_eq!(permutations.next(), Some([1, 2])); assert_eq!(permutations.next(), Some([2, 1])); assert_eq!(permutations.next(), None);
Note: Permutations does not take into account the equality of the iterated values.
let mut permutations = vec![2, 2].into_iter().permutations(); assert_eq!(permutations.next(), Some([2, 2])); // Note: these are the same assert_eq!(permutations.next(), Some([2, 2])); // Note: these are the same assert_eq!(permutations.next(), None);