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Implement FromIterator<(AE, BE)> for (impl Default+Extend<AE>, impl Default+Extend<BE>)

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Maybe Waffle 2023-01-30 08:56:37 +00:00
parent 029cb1b13b
commit 03862a5538
1 changed files with 14 additions and 0 deletions
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14
library/core/src/iter/traits/collect.rs
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@ -150,6 +150,20 @@ pub trait FromIterator<A>: Sized {
fn from_iter<T: IntoIterator<Item = A>>(iter: T) -> Self;
}
#[stable(feature = "from_iterator_for_tuple", since = "CURRENT_RUSTC_VERSION")]
impl<A, B, AE, BE> FromIterator<(AE, BE)> for (A, B)
where
A: Default + Extend<AE>,
B: Default + Extend<BE>,
{
fn from_iter<I: IntoIterator<Item = (AE, BE)>>(iter: I) -> Self {
let mut res = <(A, B)>::default();
res.extend(iter);
res
}
}
/// Conversion into an [`Iterator`].
///
/// By implementing `IntoIterator` for a type, you define how it will be