1.0.0[−][src]Trait af_lib::iter::__std_iter::ExactSizeIterator
An iterator that knows its exact length.
Many Iterator
s don't know how many times they will iterate, but some do.
If an iterator knows how many times it can iterate, providing access to
that information can be useful. For example, if you want to iterate
backwards, a good start is to know where the end is.
When implementing an ExactSizeIterator
, you must also implement
Iterator
. When doing so, the implementation of Iterator::size_hint
must return the exact size of the iterator.
The len
method has a default implementation, so you usually shouldn't
implement it. However, you may be able to provide a more performant
implementation than the default, so overriding it in this case makes sense.
Examples
Basic usage:
// a finite range knows exactly how many times it will iterate let five = 0..5; assert_eq!(5, five.len());
In the module-level docs, we implemented an Iterator
, Counter
.
Let's implement ExactSizeIterator
for it as well:
impl ExactSizeIterator for Counter { // We can easily calculate the remaining number of iterations. fn len(&self) -> usize { 5 - self.count } } // And now we can use it! let counter = Counter::new(); assert_eq!(5, counter.len());
Provided methods
pub fn len(&self) -> usize
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Returns the exact length of the iterator.
The implementation ensures that the iterator will return exactly len()
more times a Some(T)
value, before returning None
.
This method has a default implementation, so you usually should not
implement it directly. However, if you can provide a more efficient
implementation, you can do so. See the trait-level docs for an
example.
This function has the same safety guarantees as the
Iterator::size_hint
function.
Examples
Basic usage:
// a finite range knows exactly how many times it will iterate let five = 0..5; assert_eq!(5, five.len());
pub fn is_empty(&self) -> bool
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exact_size_is_empty
)Returns true
if the iterator is empty.
This method has a default implementation using
ExactSizeIterator::len()
, so you don't need to implement it yourself.
Examples
Basic usage:
#![feature(exact_size_is_empty)] let mut one_element = std::iter::once(0); assert!(!one_element.is_empty()); assert_eq!(one_element.next(), Some(0)); assert!(one_element.is_empty()); assert_eq!(one_element.next(), None);
Implementations on Foreign Types
impl<'_, K, V> ExactSizeIterator for ValuesMut<'_, K, V>
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impl<K> ExactSizeIterator for IntoIter<K>
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impl<'a> ExactSizeIterator for CommandEnvs<'a>
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impl ExactSizeIterator for Args
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impl<'_, K> ExactSizeIterator for Iter<'_, K>
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impl<K, V> ExactSizeIterator for IntoIter<K, V>
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impl<K, V> ExactSizeIterator for IntoKeys<K, V>
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impl<'_, K, V> ExactSizeIterator for Values<'_, K, V>
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impl<'_, K> ExactSizeIterator for Drain<'_, K>
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impl<'_, K, V> ExactSizeIterator for IterMut<'_, K, V>
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impl ExactSizeIterator for ArgsOs
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impl<'_, K, V> ExactSizeIterator for Keys<'_, K, V>
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impl<'_, K, V> ExactSizeIterator for Drain<'_, K, V>
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impl<'_, K, V> ExactSizeIterator for Iter<'_, K, V>
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impl<'a> ExactSizeIterator for CommandArgs<'a>
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impl<K, V> ExactSizeIterator for IntoValues<K, V>
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impl<T> ExactSizeIterator for IntoIter<T>
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impl<'_, A> ExactSizeIterator for IterMut<'_, A>
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impl ExactSizeIterator for EscapeDefault
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impl<A> ExactSizeIterator for IntoIter<A>
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impl<'_, A> ExactSizeIterator for Iter<'_, A>
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impl<'_, I> ExactSizeIterator for &'_ mut I where
I: ExactSizeIterator + ?Sized,
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I: ExactSizeIterator + ?Sized,
impl<'_, T> ExactSizeIterator for Iter<'_, T>
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impl<T, const N: usize> ExactSizeIterator for IntoIter<T, N>
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impl<'_, T> ExactSizeIterator for IterMut<'_, T>
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impl<K, V> ExactSizeIterator for IntoValues<K, V>
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impl<'_, K, V> ExactSizeIterator for ValuesMut<'_, K, V>
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impl<T> ExactSizeIterator for IntoIter<T>
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impl<'_, T> ExactSizeIterator for IterMut<'_, T>
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impl<'_, T> ExactSizeIterator for IterMut<'_, T>
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impl<T> ExactSizeIterator for IntoIterSorted<T> where
T: Ord,
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T: Ord,
impl<'_, K, V> ExactSizeIterator for Keys<'_, K, V>
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impl<'_, T> ExactSizeIterator for Drain<'_, T>
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impl<T> ExactSizeIterator for IntoIter<T>
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impl<'_, I, A> ExactSizeIterator for Splice<'_, I, A> where
A: Allocator,
I: Iterator,
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A: Allocator,
I: Iterator,
impl<'_, K, V> ExactSizeIterator for IterMut<'_, K, V>
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impl<I, A> ExactSizeIterator for Box<I, A> where
A: Allocator,
I: ExactSizeIterator + ?Sized,
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A: Allocator,
I: ExactSizeIterator + ?Sized,
impl<T> ExactSizeIterator for IntoIter<T>
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impl<T> ExactSizeIterator for IntoIter<T>
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impl<'_, K, V> ExactSizeIterator for Values<'_, K, V>
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impl<'_, T> ExactSizeIterator for Iter<'_, T>
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impl<K, V> ExactSizeIterator for IntoIter<K, V>
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impl<'_, T> ExactSizeIterator for Iter<'_, T>
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impl<'_, T> ExactSizeIterator for DrainSorted<'_, T> where
T: Ord,
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T: Ord,
impl<T, A> ExactSizeIterator for IntoIter<T, A> where
A: Allocator,
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A: Allocator,
impl<'_, K, V> ExactSizeIterator for Iter<'_, K, V>
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impl<'_, T> ExactSizeIterator for Iter<'_, T>
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impl<'_, T> ExactSizeIterator for Iter<'_, T>
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impl<K, V> ExactSizeIterator for IntoKeys<K, V>
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impl<'_, T> ExactSizeIterator for Drain<'_, T>
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impl<'_, T, A> ExactSizeIterator for Drain<'_, T, A> where
A: Allocator,
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A: Allocator,
impl<A> ExactSizeIterator for IntoIter<A> where
A: Array,
A: Array,
impl<'a, T> ExactSizeIterator for Drain<'a, T> where
T: Array,
T: Array,
impl<'a, S, T> ExactSizeIterator for SliceChooseIter<'a, S, T> where
T: 'a,
S: Index<usize, Output = T> + 'a + ?Sized,
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T: 'a,
S: Index<usize, Output = T> + 'a + ?Sized,
impl ExactSizeIterator for IndexVecIntoIter
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impl<'a> ExactSizeIterator for IndexVecIter<'a>
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impl<'r> ExactSizeIterator for CaptureNames<'r>
impl<'r> ExactSizeIterator for CaptureNames<'r>
impl<T> ExactSizeIterator for IntoIter<T> where
T: Send,
T: Send,
impl<'_, T> ExactSizeIterator for IterMut<'_, T> where
T: Send,
T: Send,
impl<T> ExactSizeIterator for CachedIntoIter<T> where
T: Send,
T: Send,
impl<'a, T> ExactSizeIterator for CachedIterMut<'a, T> where
T: 'a + Send,
T: 'a + Send,
impl<T> ExactSizeIterator for IntoIter<T> where
T: Buf,
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T: Buf,
impl<T, N> ExactSizeIterator for GenericArrayIter<T, N> where
N: ArrayLength<T>,
N: ArrayLength<T>,
impl<'p, A, I> ExactSizeIterator for TinyVecSplice<'p, A, I> where
A: Array,
I: Iterator<Item = <A as Array>::Item>,
A: Array,
I: Iterator<Item = <A as Array>::Item>,
impl<'a, T> ExactSizeIterator for ArrayVecDrain<'a, T> where
T: 'a + Default,
T: 'a + Default,
impl<'p, A, I> ExactSizeIterator for ArrayVecSplice<'p, A, I> where
A: Array,
I: Iterator<Item = <A as Array>::Item>,
A: Array,
I: Iterator<Item = <A as Array>::Item>,
impl<'a, K, V> ExactSizeIterator for Keys<'a, K, V>
impl<'a, K, V> ExactSizeIterator for Values<'a, K, V> where
V: 'a,
K: 'a + Ord,
V: 'a,
K: 'a + Ord,
impl<'a, K, V> ExactSizeIterator for Iter<'a, K, V> where
(K, V): 'a,
(K, V): BTreeValue,
(K, V): 'a,
(K, V): BTreeValue,
impl<A> ExactSizeIterator for ConsumingIter<A> where
A: Clone,
A: Clone,
impl<'a, A> ExactSizeIterator for Iter<'a, A> where
A: 'a + Ord,
A: 'a + Ord,
impl<'a, A> ExactSizeIterator for IterMut<'a, A> where
A: Clone,
A: Clone,
impl<A> ExactSizeIterator for ConsumingIter<A> where
A: Hash + Eq + Clone,
A: Hash + Eq + Clone,
impl<'a, A> ExactSizeIterator for Iter<'a, A> where
A: Clone,
A: Clone,
impl<A> ExactSizeIterator for ConsumingIter<A> where
A: HashValue + Clone,
A: HashValue + Clone,
impl<A> ExactSizeIterator for ConsumingIter<A> where
A: BTreeValue + Clone,
A: BTreeValue + Clone,
impl<'a, A> ExactSizeIterator for Iter<'a, A>
impl<'a, K, V> ExactSizeIterator for Iter<'a, K, V>
impl<'a, K, V> ExactSizeIterator for Values<'a, K, V>
impl<'a, K, V> ExactSizeIterator for IterMut<'a, K, V> where
V: Clone,
K: Clone,
V: Clone,
K: Clone,
impl<'a, K, V> ExactSizeIterator for Keys<'a, K, V> where
V: 'a,
K: 'a + Ord,
V: 'a,
K: 'a + Ord,
impl<'a, A, N> ExactSizeIterator for Drain<'a, A, N> where
N: ChunkLength<A> + 'a,
A: 'a,
N: ChunkLength<A> + 'a,
A: 'a,
impl<A, N> ExactSizeIterator for Iter<A, N> where
N: ChunkLength<A>,
N: ChunkLength<A>,
impl<A, T> ExactSizeIterator for Iter<A, T>
impl<'a, A, T> ExactSizeIterator for Drain<'a, A, T>
impl<T> ExactSizeIterator for IntoIter<T> where
T: Stackable,
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T: Stackable,
impl<'a, T> ExactSizeIterator for IterMut<'a, T> where
T: Stackable,
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T: Stackable,
impl<'a, T> ExactSizeIterator for Iter<'a, T> where
T: Stackable,
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T: Stackable,
impl<'_, Fut> ExactSizeIterator for Iter<'_, Fut> where
Fut: Unpin,
Fut: Unpin,
impl<'_, Fut> ExactSizeIterator for IterMut<'_, Fut> where
Fut: Unpin,
Fut: Unpin,
impl<'_, Fut> ExactSizeIterator for IterPinRef<'_, Fut>
impl<'_, Fut> ExactSizeIterator for IterPinMut<'_, Fut>
impl<'a, K, V> ExactSizeIterator for Values<'a, K, V>
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impl<'a, T> ExactSizeIterator for Iter<'a, T>
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impl<'a, K, V> ExactSizeIterator for Entries<'a, K, V>
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impl<'a, K, V> ExactSizeIterator for Keys<'a, K, V>
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impl ExactSizeIterator for IndexVecIntoIter
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impl<'a, S, T> ExactSizeIterator for SliceChooseIter<'a, S, T> where
T: 'a,
S: Index<usize, Output = T> + 'a + ?Sized,
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T: 'a,
S: Index<usize, Output = T> + 'a + ?Sized,
impl<'a> ExactSizeIterator for IndexVecIter<'a>
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impl<'a, T> ExactSizeIterator for Keys<'a, T>
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impl<T> ExactSizeIterator for IntoIter<T> where
T: Buf,
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T: Buf,
impl<'_, K, V> ExactSizeIterator for ValuesMut<'_, K, V>
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impl<'_, K, V> ExactSizeIterator for Keys<'_, K, V>
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impl<K, V> ExactSizeIterator for IntoIter<K, V>
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impl<'_, K, V> ExactSizeIterator for Iter<'_, K, V>
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impl<'_, K, V> ExactSizeIterator for Values<'_, K, V>
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impl<'_, T> ExactSizeIterator for Iter<'_, T>
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impl<T> ExactSizeIterator for IntoIter<T>
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impl<'_, K, V> ExactSizeIterator for IterMut<'_, K, V>
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impl<'_, T> ExactSizeIterator for RawDrain<'_, T>
impl<'_, K> ExactSizeIterator for Drain<'_, K>
impl<'_, K, V> ExactSizeIterator for Keys<'_, K, V>
impl<'_, K, V> ExactSizeIterator for Values<'_, K, V>
impl<'_, K, V> ExactSizeIterator for Iter<'_, K, V>
impl<'_, K, V> ExactSizeIterator for Drain<'_, K, V>
impl<K, V> ExactSizeIterator for IntoIter<K, V>
impl<'_, K, V> ExactSizeIterator for IterMut<'_, K, V>
impl<'a, K> ExactSizeIterator for Iter<'a, K>
impl<T> ExactSizeIterator for RawIter<T>
impl<K> ExactSizeIterator for IntoIter<K>
impl<T> ExactSizeIterator for RawIntoIter<T>
impl<'_, K, V> ExactSizeIterator for ValuesMut<'_, K, V>
impl ExactSizeIterator for Iter
impl ExactSizeIterator for IterRaw
Loading content...Implementors
impl ExactSizeIterator for EscapeDebug
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impl ExactSizeIterator for af_lib::prelude::af_core::test::prelude::char::EscapeDefault
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impl ExactSizeIterator for EscapeUnicode
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impl ExactSizeIterator for ToLowercase
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impl ExactSizeIterator for ToUppercase
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impl ExactSizeIterator for af_lib::prelude::af_core::test::prelude::json::map::IntoIter
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impl ExactSizeIterator for Range<i8>
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impl ExactSizeIterator for Range<i16>
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impl ExactSizeIterator for Range<i32>
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impl ExactSizeIterator for Range<isize>
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impl ExactSizeIterator for Range<u8>
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impl ExactSizeIterator for Range<u16>
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impl ExactSizeIterator for Range<u32>
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impl ExactSizeIterator for Range<usize>
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impl ExactSizeIterator for RangeInclusive<i8>
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impl ExactSizeIterator for RangeInclusive<i16>
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impl ExactSizeIterator for RangeInclusive<u8>
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impl ExactSizeIterator for RangeInclusive<u16>
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impl<'_> ExactSizeIterator for Bytes<'_>
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impl<'_, T> ExactSizeIterator for Chunks<'_, T>
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impl<'_, T> ExactSizeIterator for ChunksExact<'_, T>
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impl<'_, T> ExactSizeIterator for ChunksExactMut<'_, T>
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impl<'_, T> ExactSizeIterator for ChunksMut<'_, T>
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impl<'_, T> ExactSizeIterator for af_lib::prelude::af_core::test::prelude::slice::Iter<'_, T>
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impl<'_, T> ExactSizeIterator for af_lib::prelude::af_core::test::prelude::slice::IterMut<'_, T>
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impl<'_, T> ExactSizeIterator for RChunks<'_, T>
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impl<'_, T> ExactSizeIterator for RChunksExactMut<'_, T>
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impl<'_, T> ExactSizeIterator for RChunksMut<'_, T>
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impl<'_, T> ExactSizeIterator for Windows<'_, T>
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impl<'_, T, const N: usize> ExactSizeIterator for ArrayChunks<'_, T, N>
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impl<'_, T, const N: usize> ExactSizeIterator for ArrayChunksMut<'_, T, N>
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impl<'_, T, const N: usize> ExactSizeIterator for ArrayWindows<'_, T, N>
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impl<'a> ExactSizeIterator for af_lib::prelude::af_core::test::prelude::json::map::Iter<'a>
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impl<'a> ExactSizeIterator for af_lib::prelude::af_core::test::prelude::json::map::IterMut<'a>
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impl<'a> ExactSizeIterator for af_lib::prelude::af_core::test::prelude::json::map::Keys<'a>
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impl<'a> ExactSizeIterator for af_lib::prelude::af_core::test::prelude::json::map::Values<'a>
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impl<'a> ExactSizeIterator for af_lib::prelude::af_core::test::prelude::json::map::ValuesMut<'a>
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impl<'a, I, T> ExactSizeIterator for Cloned<I> where
T: 'a + Clone,
I: ExactSizeIterator<Item = &'a T>,
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T: 'a + Clone,
I: ExactSizeIterator<Item = &'a T>,
impl<'a, I, T> ExactSizeIterator for Copied<I> where
T: 'a + Copy,
I: ExactSizeIterator<Item = &'a T>,
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T: 'a + Copy,
I: ExactSizeIterator<Item = &'a T>,
impl<'a, T> ExactSizeIterator for RChunksExact<'a, T>
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impl<A> ExactSizeIterator for RepeatN<A> where
A: Clone,
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A: Clone,
impl<A> ExactSizeIterator for af_lib::iter::structs::Zip<(A,)> where
A: ExactSizeIterator,
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A: ExactSizeIterator,
impl<A, B> ExactSizeIterator for af_lib::iter::__std_iter::Zip<A, B> where
B: ExactSizeIterator,
A: ExactSizeIterator,
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B: ExactSizeIterator,
A: ExactSizeIterator,
impl<A, B> ExactSizeIterator for af_lib::iter::structs::Zip<(A, B)> where
B: ExactSizeIterator,
A: ExactSizeIterator,
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B: ExactSizeIterator,
A: ExactSizeIterator,
impl<A, B, C> ExactSizeIterator for af_lib::iter::structs::Zip<(A, B, C)> where
C: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
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C: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
impl<A, B, C, D> ExactSizeIterator for af_lib::iter::structs::Zip<(A, B, C, D)> where
C: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
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C: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
impl<A, B, C, D, E> ExactSizeIterator for af_lib::iter::structs::Zip<(A, B, C, D, E)> where
C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
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C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
impl<A, B, C, D, E, F> ExactSizeIterator for af_lib::iter::structs::Zip<(A, B, C, D, E, F)> where
C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
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C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
impl<A, B, C, D, E, F, G> ExactSizeIterator for af_lib::iter::structs::Zip<(A, B, C, D, E, F, G)> where
C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
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C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
impl<A, B, C, D, E, F, G, H> ExactSizeIterator for af_lib::iter::structs::Zip<(A, B, C, D, E, F, G, H)> where
C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
H: ExactSizeIterator,
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C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
H: ExactSizeIterator,
impl<A, B, C, D, E, F, G, H, I> ExactSizeIterator for af_lib::iter::structs::Zip<(A, B, C, D, E, F, G, H, I)> where
C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
I: ExactSizeIterator,
H: ExactSizeIterator,
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C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
I: ExactSizeIterator,
H: ExactSizeIterator,
impl<A, B, C, D, E, F, G, H, I, J> ExactSizeIterator for af_lib::iter::structs::Zip<(A, B, C, D, E, F, G, H, I, J)> where
C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
I: ExactSizeIterator,
J: ExactSizeIterator,
H: ExactSizeIterator,
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C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
I: ExactSizeIterator,
J: ExactSizeIterator,
H: ExactSizeIterator,
impl<A, B, C, D, E, F, G, H, I, J, K> ExactSizeIterator for af_lib::iter::structs::Zip<(A, B, C, D, E, F, G, H, I, J, K)> where
C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
I: ExactSizeIterator,
K: ExactSizeIterator,
J: ExactSizeIterator,
H: ExactSizeIterator,
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C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
I: ExactSizeIterator,
K: ExactSizeIterator,
J: ExactSizeIterator,
H: ExactSizeIterator,
impl<A, B, C, D, E, F, G, H, I, J, K, L> ExactSizeIterator for af_lib::iter::structs::Zip<(A, B, C, D, E, F, G, H, I, J, K, L)> where
C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
L: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
I: ExactSizeIterator,
K: ExactSizeIterator,
J: ExactSizeIterator,
H: ExactSizeIterator,
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C: ExactSizeIterator,
E: ExactSizeIterator,
B: ExactSizeIterator,
L: ExactSizeIterator,
A: ExactSizeIterator,
D: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
I: ExactSizeIterator,
K: ExactSizeIterator,
J: ExactSizeIterator,
H: ExactSizeIterator,
impl<A, F> ExactSizeIterator for OnceWith<F> where
F: FnOnce() -> A,
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F: FnOnce() -> A,
impl<B, I, F> ExactSizeIterator for Map<I, F> where
F: FnMut(<I as Iterator>::Item) -> B,
I: ExactSizeIterator,
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F: FnMut(<I as Iterator>::Item) -> B,
I: ExactSizeIterator,
impl<I> ExactSizeIterator for Enumerate<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for ExactlyOneError<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for Fuse<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for MultiPeek<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for PeekNth<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for Peekable<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for Rev<I> where
I: ExactSizeIterator + DoubleEndedIterator,
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I: ExactSizeIterator + DoubleEndedIterator,
impl<I> ExactSizeIterator for Skip<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for StepBy<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for Take<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for Tee<I> where
I: ExactSizeIterator,
<I as Iterator>::Item: Clone,
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I: ExactSizeIterator,
<I as Iterator>::Item: Clone,
impl<I> ExactSizeIterator for WithPosition<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for Step<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I, F> ExactSizeIterator for Inspect<I, F> where
F: FnMut(&<I as Iterator>::Item),
I: ExactSizeIterator,
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F: FnMut(&<I as Iterator>::Item),
I: ExactSizeIterator,
impl<I, F> ExactSizeIterator for PadUsing<I, F> where
F: FnMut(usize) -> <I as Iterator>::Item,
I: ExactSizeIterator,
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F: FnMut(usize) -> <I as Iterator>::Item,
I: ExactSizeIterator,
impl<I, F> ExactSizeIterator for Update<I, F> where
F: FnMut(&mut <I as Iterator>::Item),
I: ExactSizeIterator,
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F: FnMut(&mut <I as Iterator>::Item),
I: ExactSizeIterator,
impl<I, J> ExactSizeIterator for ZipEq<I, J> where
I: ExactSizeIterator,
J: ExactSizeIterator,
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I: ExactSizeIterator,
J: ExactSizeIterator,
impl<L, R> ExactSizeIterator for Either<L, R> where
L: ExactSizeIterator,
R: ExactSizeIterator<Item = <L as Iterator>::Item>,
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L: ExactSizeIterator,
R: ExactSizeIterator<Item = <L as Iterator>::Item>,
impl<T> ExactSizeIterator for Empty<T>
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impl<T> ExactSizeIterator for Once<T>
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impl<T> ExactSizeIterator for TupleBuffer<T> where
T: HomogeneousTuple,
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T: HomogeneousTuple,
impl<T, U> ExactSizeIterator for ZipLongest<T, U> where
T: ExactSizeIterator,
U: ExactSizeIterator,
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T: ExactSizeIterator,
U: ExactSizeIterator,