1.0.0[−][src]Trait tract_onnx::prelude::tract_itertools::__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 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
fn len(&self) -> usize
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 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());
fn is_empty(&self) -> bool
exact_size_is_empty
)Returns true
if the iterator is empty.
This method has a default implementation using self.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 ExactSizeIterator for ArgsOs
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impl ExactSizeIterator for Args
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impl<K, V> ExactSizeIterator for IntoKeys<K, V>
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impl<K, V> ExactSizeIterator for IntoValues<K, V>
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impl<'_, K> ExactSizeIterator for Iter<'_, K>
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impl<K> ExactSizeIterator for IntoIter<K>
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impl<K, V> ExactSizeIterator for IntoIter<K, V>
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impl<'_, K, V> ExactSizeIterator for Values<'_, K, V>
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impl<'_, K, V> ExactSizeIterator for IterMut<'_, K, V>
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impl<'_, K, V> ExactSizeIterator for Keys<'_, K, V>
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impl<'_, K, V> ExactSizeIterator for ValuesMut<'_, 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<'_, K> ExactSizeIterator for Drain<'_, K>
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impl ExactSizeIterator for EscapeDefault
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impl<'_, A> ExactSizeIterator for Iter<'_, A>
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impl ExactSizeIterator for RangeInclusive<u8>
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impl<'_, T> ExactSizeIterator for IterMut<'_, T>
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impl ExactSizeIterator for ToUppercase
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impl<'_, T> ExactSizeIterator for IterMut<'_, T>
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impl ExactSizeIterator for Range<i32>
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impl ExactSizeIterator for Range<u16>
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impl ExactSizeIterator for Range<isize>
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impl<'_, A> ExactSizeIterator for IterMut<'_, A>
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impl<'a, T> ExactSizeIterator for RChunksExact<'a, T>
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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 ExactSizeIterator for RangeInclusive<u16>
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impl<'_, T> ExactSizeIterator for RChunksMut<'_, T>
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impl ExactSizeIterator for Range<i8>
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impl<T, const N: usize> ExactSizeIterator for IntoIter<T, N>
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impl<'_, T> ExactSizeIterator for RChunksExactMut<'_, T>
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impl<A> ExactSizeIterator for IntoIter<A>
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impl ExactSizeIterator for RangeInclusive<i8>
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impl<'_, T> ExactSizeIterator for Windows<'_, T>
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impl<'_, T> ExactSizeIterator for RChunks<'_, T>
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impl ExactSizeIterator for EscapeDefault
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impl ExactSizeIterator for Range<usize>
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impl<'_, T> ExactSizeIterator for ChunksMut<'_, T>
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impl ExactSizeIterator for EscapeDebug
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impl<'_> ExactSizeIterator for Bytes<'_>
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impl ExactSizeIterator for RangeInclusive<i16>
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impl ExactSizeIterator for ToLowercase
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impl<'_, T, const N: usize> ExactSizeIterator for ArrayChunks<'_, T, N>
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impl ExactSizeIterator for Range<u32>
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impl ExactSizeIterator for Range<i16>
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impl ExactSizeIterator for Range<u8>
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impl<'_, T> ExactSizeIterator for Iter<'_, T>
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impl ExactSizeIterator for EscapeUnicode
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impl<T> ExactSizeIterator for IntoIter<T>
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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> ExactSizeIterator for ChunksExactMut<'_, T>
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impl<'_, T> ExactSizeIterator for Drain<'_, 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 IntoKeys<K, V>
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impl<'_, K, V> ExactSizeIterator for Iter<'_, K, V>
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impl<'_, T> ExactSizeIterator for Iter<'_, T>
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impl<'_, K, V> ExactSizeIterator for Keys<'_, K, V>
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impl<K, V> ExactSizeIterator for IntoValues<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<'_, T> ExactSizeIterator for IterMut<'_, T>
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impl<I> ExactSizeIterator for Box<I> where
I: ExactSizeIterator + ?Sized,
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I: ExactSizeIterator + ?Sized,
impl<'_, I> ExactSizeIterator for Splice<'_, I> where
I: Iterator,
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I: Iterator,
impl<'_, K, V> ExactSizeIterator for IterMut<'_, K, V>
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impl<'_, T> ExactSizeIterator for DrainSorted<'_, T> where
T: Ord,
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T: Ord,
impl<'_, T> ExactSizeIterator for Drain<'_, T>
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impl<'_, T> ExactSizeIterator for IterMut<'_, T>
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impl<T> ExactSizeIterator for IntoIter<T>
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impl<T> ExactSizeIterator for IntoIter<T>
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impl<'_, T> ExactSizeIterator for Drain<'_, 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 IntoIter<T>
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impl<'_, K, V> ExactSizeIterator for Values<'_, K, V>
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impl<T> ExactSizeIterator for IntoIter<T>
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impl<'_, T> ExactSizeIterator for Iter<'_, T>
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impl<'_, K, V> ExactSizeIterator for ValuesMut<'_, K, V>
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impl<'_, K, V> ExactSizeIterator for Iter<'_, K, V>
impl<K> ExactSizeIterator for IntoIter<K>
impl<'_, K, V> ExactSizeIterator for IterMut<'_, K, V>
impl<'a, K> ExactSizeIterator for Iter<'a, K>
impl<K, V> ExactSizeIterator for IntoIter<K, V>
impl<'_, K, V> ExactSizeIterator for Values<'_, K, V>
impl<'_, K, V> ExactSizeIterator for Drain<'_, K, V>
impl<'_, K, V> ExactSizeIterator for ValuesMut<'_, K, V>
impl<'_, K> ExactSizeIterator for Drain<'_, K>
impl<'_, K, V> ExactSizeIterator for Keys<'_, K, V>
impl<B> ExactSizeIterator for IntoIter<B> where
B: BitBlock,
B: BitBlock,
impl<'a, B> ExactSizeIterator for Iter<'a, B> where
B: BitBlock,
B: BitBlock,
impl<'a, B> ExactSizeIterator for Blocks<'a, B> where
B: BitBlock,
B: BitBlock,
impl<A> ExactSizeIterator for Zip<(A,)> where
A: ExactSizeIterator,
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A: ExactSizeIterator,
impl<A, B, C, D, E> ExactSizeIterator for Zip<(A, B, C, D, E)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
impl<I> ExactSizeIterator for ExactlyOneError<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<A, B, C, D, E, F, G> ExactSizeIterator for Zip<(A, B, C, D, E, F, G)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
F: ExactSizeIterator,
G: 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<A, B, C, D> ExactSizeIterator for Zip<(A, B, C, D)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: 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<A, B, C, D, E, F, G, H> ExactSizeIterator for Zip<(A, B, C, D, E, F, G, H)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
H: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
H: ExactSizeIterator,
impl<T> ExactSizeIterator for TupleBuffer<T> where
T: TupleCollect,
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T: TupleCollect,
impl<T, U> ExactSizeIterator for ZipLongest<T, U> where
T: ExactSizeIterator,
U: ExactSizeIterator,
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T: ExactSizeIterator,
U: ExactSizeIterator,
impl<A, B> ExactSizeIterator for Zip<(A, B)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
impl<I> ExactSizeIterator for MultiPeek<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<A, B, C, D, E, F> ExactSizeIterator for Zip<(A, B, C, D, E, F)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
F: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
F: ExactSizeIterator,
impl<I, R> ExactSizeIterator for MapInto<I, R> where
I: ExactSizeIterator,
<I as Iterator>::Item: Into<R>,
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I: ExactSizeIterator,
<I as Iterator>::Item: Into<R>,
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<A, B, C> ExactSizeIterator for Zip<(A, B, C)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
impl<A> ExactSizeIterator for RepeatN<A> where
A: Clone,
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A: Clone,
impl<I> ExactSizeIterator for WithPosition<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I, J> ExactSizeIterator for ZipEq<I, J> where
I: ExactSizeIterator,
J: ExactSizeIterator,
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I: ExactSizeIterator,
J: ExactSizeIterator,
impl<'a, T> ExactSizeIterator for Drain<'a, T> where
T: Array,
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T: Array,
impl<A> ExactSizeIterator for IntoIter<A> where
A: Array,
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A: Array,
impl<T> ExactSizeIterator for IntoIter<T> where
T: Buf,
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T: Buf,
impl<A> ExactSizeIterator for IntoIter<A> where
A: Array,
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A: Array,
impl<'a, A> ExactSizeIterator for Drain<'a, A> where
A: Array,
<A as Array>::Item: 'a,
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Loading content...
A: Array,
<A as Array>::Item: 'a,
Implementors
impl<'a, A, D> ExactSizeIterator for AxisChunksIter<'a, A, D> where
D: Dimension,
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D: Dimension,
impl<'a, A, D> ExactSizeIterator for AxisChunksIterMut<'a, A, D> where
D: Dimension,
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D: Dimension,
impl<'a, A, D> ExactSizeIterator for AxisIter<'a, A, D> where
D: Dimension,
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D: Dimension,
impl<'a, A, D> ExactSizeIterator for AxisIterMut<'a, A, D> where
D: Dimension,
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D: Dimension,
impl<'a, A, D> ExactSizeIterator for IndexedIter<'a, A, D> where
D: Dimension,
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D: Dimension,
impl<'a, A, D> ExactSizeIterator for IndexedIterMut<'a, A, D> where
D: Dimension,
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D: Dimension,
impl<'a, A, D> ExactSizeIterator for tract_onnx::prelude::tract_ndarray::iter::Iter<'a, A, D> where
D: Dimension,
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D: Dimension,
impl<'a, A, D> ExactSizeIterator for tract_onnx::prelude::tract_ndarray::iter::IterMut<'a, A, D> where
D: Dimension,
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D: Dimension,
impl<'a, A, D> ExactSizeIterator for LanesIter<'a, A, D> where
D: Dimension,
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D: Dimension,
impl<'a, A, D> ExactSizeIterator for LanesIterMut<'a, A, D> where
D: Dimension,
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D: Dimension,
impl<'a, I, T> ExactSizeIterator for Cloned<I> where
I: ExactSizeIterator<Item = &'a T>,
T: 'a + Clone,
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I: ExactSizeIterator<Item = &'a T>,
T: 'a + Clone,
impl<'a, I, T> ExactSizeIterator for Copied<I> where
I: ExactSizeIterator<Item = &'a T>,
T: 'a + Copy,
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I: ExactSizeIterator<Item = &'a T>,
T: 'a + Copy,
impl<A> ExactSizeIterator for tract_onnx::prelude::tract_itertools::RepeatN<A> where
A: Clone,
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A: Clone,
impl<A> ExactSizeIterator for tract_onnx::prelude::tract_itertools::Zip<(A,)> where
A: ExactSizeIterator,
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A: ExactSizeIterator,
impl<A, B> ExactSizeIterator for tract_onnx::prelude::tract_itertools::__std_iter::Zip<A, B> where
A: ExactSizeIterator,
B: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
impl<A, B> ExactSizeIterator for tract_onnx::prelude::tract_itertools::Zip<(A, B)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
impl<A, B, C> ExactSizeIterator for tract_onnx::prelude::tract_itertools::Zip<(A, B, C)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
impl<A, B, C, D> ExactSizeIterator for tract_onnx::prelude::tract_itertools::Zip<(A, B, C, D)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
impl<A, B, C, D, E> ExactSizeIterator for tract_onnx::prelude::tract_itertools::Zip<(A, B, C, D, E)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
impl<A, B, C, D, E, F> ExactSizeIterator for tract_onnx::prelude::tract_itertools::Zip<(A, B, C, D, E, F)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
F: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
F: ExactSizeIterator,
impl<A, B, C, D, E, F, G> ExactSizeIterator for tract_onnx::prelude::tract_itertools::Zip<(A, B, C, D, E, F, G)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
impl<A, B, C, D, E, F, G, H> ExactSizeIterator for tract_onnx::prelude::tract_itertools::Zip<(A, B, C, D, E, F, G, H)> where
A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
F: ExactSizeIterator,
G: ExactSizeIterator,
H: ExactSizeIterator,
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A: ExactSizeIterator,
B: ExactSizeIterator,
C: ExactSizeIterator,
D: ExactSizeIterator,
E: ExactSizeIterator,
F: ExactSizeIterator,
G: 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<D> ExactSizeIterator for IndicesIter<D> where
D: Dimension,
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D: Dimension,
impl<I> ExactSizeIterator for Enumerate<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 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 tract_onnx::prelude::tract_itertools::ExactlyOneError<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for tract_onnx::prelude::tract_itertools::MultiPeek<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for tract_onnx::prelude::tract_itertools::Step<I> where
I: ExactSizeIterator,
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I: ExactSizeIterator,
impl<I> ExactSizeIterator for tract_onnx::prelude::tract_itertools::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 tract_onnx::prelude::tract_itertools::WithPosition<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 tract_onnx::prelude::tract_itertools::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 tract_onnx::prelude::tract_itertools::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 tract_onnx::prelude::tract_itertools::ZipEq<I, J> where
I: ExactSizeIterator,
J: ExactSizeIterator,
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I: ExactSizeIterator,
J: ExactSizeIterator,
impl<I, R> ExactSizeIterator for tract_onnx::prelude::tract_itertools::MapInto<I, R> where
I: ExactSizeIterator,
<I as Iterator>::Item: Into<R>,
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I: ExactSizeIterator,
<I as Iterator>::Item: Into<R>,
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 tract_onnx::prelude::tract_itertools::TupleBuffer<T> where
T: HomogeneousTuple,
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T: HomogeneousTuple,
impl<T, U> ExactSizeIterator for tract_onnx::prelude::tract_itertools::ZipLongest<T, U> where
T: ExactSizeIterator,
U: ExactSizeIterator,
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T: ExactSizeIterator,
U: ExactSizeIterator,