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rename specializing trait to ConstSizeIntoIterator

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This commit is contained in:
The8472 2021-07-16 19:17:30 +02:00
parent bd1c39dc6c
commit 18a034f97e
1 changed files with 4 additions and 4 deletions
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8
library/core/src/iter/adapters/flatten.rs
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@ -297,7 +297,7 @@ where
let (blo, bhi) = self.backiter.as_ref().map_or((0, Some(0)), U::size_hint);
let lo = flo.saturating_add(blo);
if let Some(fixed_size) = <<I as Iterator>::Item as ConstSizeIterable>::size() {
if let Some(fixed_size) = <<I as Iterator>::Item as ConstSizeIntoIterator>::size() {
let (lower, upper) = self.iter.size_hint();
let lower = lower.saturating_mul(fixed_size).saturating_add(lo);
@ -474,18 +474,18 @@ where
}
}
trait ConstSizeIterable {
trait ConstSizeIntoIterator: IntoIterator {
fn size() -> Option<usize>;
}
impl<T> ConstSizeIterable for T {
impl<T> ConstSizeIntoIterator for T where T: IntoIterator {
#[inline]
default fn size() -> Option<usize> {
None
}
}
impl<T, const N: usize> ConstSizeIterable for [T; N] {
impl<T, const N: usize> ConstSizeIntoIterator for [T; N] {
#[inline]
fn size() -> Option<usize> {
Some(N)