arbitrary/foreign/core/
option.rs

1use crate::{size_hint, Arbitrary, MaxRecursionReached, Result, Unstructured};
2
3/// Returns `None`, not an error, if this `Unstructured` [is empty][Unstructured::is_empty].
4impl<'a, A> Arbitrary<'a> for Option<A>
5where
6    A: Arbitrary<'a>,
7{
8    fn arbitrary(u: &mut Unstructured<'a>) -> Result<Self> {
9        Ok(if <bool as Arbitrary<'a>>::arbitrary(u)? {
10            Some(Arbitrary::arbitrary(u)?)
11        } else {
12            None
13        })
14    }
15
16    #[inline]
17    fn size_hint(depth: usize) -> (usize, Option<usize>) {
18        Self::try_size_hint(depth).unwrap_or_default()
19    }
20
21    #[inline]
22    fn try_size_hint(depth: usize) -> Result<(usize, Option<usize>), MaxRecursionReached> {
23        Ok(size_hint::and(
24            <bool as Arbitrary>::try_size_hint(depth)?,
25            size_hint::or((0, Some(0)), <A as Arbitrary>::try_size_hint(depth)?),
26        ))
27    }
28}
arbitrary/foreign/core/option.rs

arbitrary/foreign/core/
option.rs
