Struct unarray::ArrayFromIter

pub struct ArrayFromIter<T, const N: usize>(pub Option<[T; N]>);

A wrapper type to collect an Iterator into an array

let iter = vec![1, 2, 3].into_iter();
let ArrayFromIter(array) = iter.collect();

assert_eq!(array, Some([1, 2, 3]));

Since iterators don’t carry compile-time information about their length (even core::iter::ExactSizeIterator only provides this at runtime), collecting may fail if the iterator doesn’t yield exactly N elements:

use unarray::*;
let too_many = vec![1, 2, 3, 4].into_iter();
let ArrayFromIter::<i32, 3>(option) = too_many.collect();
assert!(option.is_none());

let too_few = vec![1, 2].into_iter();
let ArrayFromIter::<i32, 3>(option) = too_few.collect();
assert!(option.is_none());

Tuple Fields

0: Option<[T; N]>

Trait Implementations

impl<T, const N: usize> FromIterator<T> for ArrayFromIter<T, N>

fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self

Creates a value from an iterator.

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.