1.0.0[−][src]Trait tract_nnef::internal::tract_downcast_rs::__std::ops::Index
Used for indexing operations (container[index]
) in immutable contexts.
container[index]
is actually syntactic sugar for *container.index(index)
,
but only when used as an immutable value. If a mutable value is requested,
IndexMut
is used instead. This allows nice things such as
let value = v[index]
if the type of value
implements Copy
.
Examples
The following example implements Index
on a read-only NucleotideCount
container, enabling individual counts to be retrieved with index syntax.
use std::ops::Index; enum Nucleotide { A, C, G, T, } struct NucleotideCount { a: usize, c: usize, g: usize, t: usize, } impl Index<Nucleotide> for NucleotideCount { type Output = usize; fn index(&self, nucleotide: Nucleotide) -> &Self::Output { match nucleotide { Nucleotide::A => &self.a, Nucleotide::C => &self.c, Nucleotide::G => &self.g, Nucleotide::T => &self.t, } } } let nucleotide_count = NucleotideCount {a: 14, c: 9, g: 10, t: 12}; assert_eq!(nucleotide_count[Nucleotide::A], 14); assert_eq!(nucleotide_count[Nucleotide::C], 9); assert_eq!(nucleotide_count[Nucleotide::G], 10); assert_eq!(nucleotide_count[Nucleotide::T], 12);
Associated Types
Loading content...Required methods
Loading content...Implementations on Foreign Types
impl<I> Index<I> for str where
I: SliceIndex<str>,
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I: SliceIndex<str>,
type Output = <I as SliceIndex<str>>::Output
fn index(&self, index: I) -> &<I as SliceIndex<str>>::Output
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impl<T, I> Index<I> for [T] where
I: SliceIndex<[T]>,
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I: SliceIndex<[T]>,
type Output = <I as SliceIndex<[T]>>::Output
fn index(&self, index: I) -> &<I as SliceIndex<[T]>>::Output
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impl<'_, K, Q, V, S> Index<&'_ Q> for HashMap<K, V, S> where
K: Eq + Hash + Borrow<Q>,
Q: Eq + Hash + ?Sized,
S: BuildHasher,
K: Eq + Hash + Borrow<Q>,
Q: Eq + Hash + ?Sized,
S: BuildHasher,
type Output = V
fn index(&self, key: &Q) -> &VⓘNotable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
Notable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
Returns a reference to the value corresponding to the supplied key.
Panics
Panics if the key is not present in the HashMap
.
impl<'input, Endian> Index<usize> for EndianSlice<'input, Endian> where
Endian: Endianity,
Endian: Endianity,
type Output = u8
fn index(
&self,
idx: usize
) -> &<EndianSlice<'input, Endian> as Index<usize>>::Output
&self,
idx: usize
) -> &<EndianSlice<'input, Endian> as Index<usize>>::Output
impl<'input, Endian> Index<RangeFrom<usize>> for EndianSlice<'input, Endian> where
Endian: Endianity,
Endian: Endianity,
type Output = [u8]
fn index(
&self,
idx: RangeFrom<usize>
) -> &<EndianSlice<'input, Endian> as Index<RangeFrom<usize>>>::Output
&self,
idx: RangeFrom<usize>
) -> &<EndianSlice<'input, Endian> as Index<RangeFrom<usize>>>::Output
impl<B> Index<usize> for BitVec<B> where
B: BitBlock,
B: BitBlock,
impl<'input, Endian> Index<usize> for EndianSlice<'input, Endian> where
Endian: Endianity,
Endian: Endianity,
type Output = u8
fn index(
&self,
idx: usize
) -> &<EndianSlice<'input, Endian> as Index<usize>>::Output
&self,
idx: usize
) -> &<EndianSlice<'input, Endian> as Index<usize>>::Output
impl<'input, Endian> Index<RangeFrom<usize>> for EndianSlice<'input, Endian> where
Endian: Endianity,
Endian: Endianity,
type Output = [u8]
fn index(
&self,
idx: RangeFrom<usize>
) -> &<EndianSlice<'input, Endian> as Index<RangeFrom<usize>>>::Output
&self,
idx: RangeFrom<usize>
) -> &<EndianSlice<'input, Endian> as Index<RangeFrom<usize>>>::Output
impl<A, I> Index<I> for SmallVec<A> where
A: Array,
I: SliceIndex<[<A as Array>::Item]>,
A: Array,
I: SliceIndex<[<A as Array>::Item]>,
type Output = <I as SliceIndex<[<A as Array>::Item]>>::Output
fn index(&self, index: I) -> &<I as SliceIndex<[<A as Array>::Item]>>::Output
Implementors
impl Index<usize> for Dim<[usize; 0]>
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impl Index<usize> for Dim<[usize; 1]>
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impl Index<usize> for Dim<[usize; 2]>
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impl Index<usize> for Dim<[usize; 3]>
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impl Index<usize> for Dim<[usize; 4]>
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impl Index<usize> for Dim<[usize; 5]>
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impl Index<usize> for Dim<[usize; 6]>
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impl Index<usize> for Dim<IxDynImpl>
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type Output = <IxDynImpl as Index<usize>>::Output
fn index(&self, index: usize) -> &<Dim<IxDynImpl> as Index<usize>>::Output
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impl Index<Range<usize>> for String
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impl Index<RangeFrom<usize>> for String
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impl Index<RangeFrom<usize>> for CStr
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impl Index<RangeFull> for String
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impl Index<RangeFull> for CString
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impl Index<RangeFull> for OsString
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impl Index<RangeInclusive<usize>> for String
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impl Index<RangeTo<usize>> for String
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impl Index<RangeToInclusive<usize>> for String
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impl<'_, K, Q, V> Index<&'_ Q> for BTreeMap<K, V> where
K: Ord + Borrow<Q>,
Q: Ord + ?Sized,
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K: Ord + Borrow<Q>,
Q: Ord + ?Sized,
type Output = V
fn index(&self, key: &Q) -> &VⓘNotable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
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Notable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
Returns a reference to the value corresponding to the supplied key.
Panics
Panics if the key is not present in the BTreeMap
.
impl<'_, K, Q, V, S> Index<&'_ Q> for tract_nnef::internal::HashMap<K, V, S> where
K: Eq + Hash + Borrow<Q>,
Q: Eq + Hash + ?Sized,
S: BuildHasher,
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K: Eq + Hash + Borrow<Q>,
Q: Eq + Hash + ?Sized,
S: BuildHasher,
type Output = V
fn index(&self, key: &Q) -> &VⓘNotable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
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Notable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
Returns a reference to the value corresponding to the supplied key.
Panics
Panics if the key is not present in the HashMap
.
impl<A> Index<usize> for VecDeque<A>
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type Output = A
fn index(&self, index: usize) -> &AⓘNotable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
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Notable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
impl<J> Index<J> for IxDynImpl where
[usize]: Index<J>,
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[usize]: Index<J>,
type Output = <[usize] as Index<J>>::Output
fn index(&self, index: J) -> &<IxDynImpl as Index<J>>::Output
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impl<S, D, I> Index<I> for ArrayBase<S, D> where
D: Dimension,
I: NdIndex<D>,
S: Data,
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D: Dimension,
I: NdIndex<D>,
S: Data,
Access the element at index.
Panics if index is out of bounds.
impl<T, I> Index<I> for Vec<T> where
I: SliceIndex<[T]>,
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I: SliceIndex<[T]>,