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Implement FromIterator for (impl Default + Extend, impl Default + Extend) #107462

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Apr 14, 2024
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Implement FromIterator for (impl Default + Extend, impl Default + Extend) #107462

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03862a5
Implement `FromIterator<(AE, BE)>` for `(impl Default+Extend<AE>, imp…
WaffleLapkin Jan 30, 2023
7b5af57
Add docs for `FromIterator<(AE, BE)> for (A, B)`
WaffleLapkin Apr 3, 2024
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Implement FromIterator<(AE, BE)> for `(impl Default+Extend<AE>, imp… 
…l Default+Extend<BE>)`
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@WaffleLapkin
WaffleLapkin committed Apr 3, 2024
commit 03862a553839ad51c24bad8e6742eb1fb2612817
14 changes: 14 additions & 0 deletions library/core/src/iter/traits/collect.rs
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Expand Up @@ -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
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