Function malachite_base::options::exhaustive::exhaustive_options

pub fn exhaustive_options<I: Iterator>(
    xs: I
) -> Chain<Once<Option<I::Item>>, ExhaustiveSomes<I>> 

Generates all Options with values from a given iterator.

None comes first, followed by the elements of the given iterator wrapped in Some.

The output length is xs.count().

Examples

use itertools::Itertools;
use malachite_base::options::exhaustive::exhaustive_options;

assert_eq!(
    exhaustive_options([1, 2, 3].iter().cloned()).collect_vec(),
    &[None, Some(1), Some(2), Some(3)]
);