1.0.0[−][src]Trait tract_hir::internal::tract_downcast_rs::__std::prelude::v1::AsRef
Used to do a cheap reference-to-reference conversion.
This trait is similar to AsMut
which is used for converting between mutable references.
If you need to do a costly conversion it is better to implement From
with type
&T
or write a custom function.
AsRef
has the same signature as Borrow
, but Borrow
is different in few aspects:
- Unlike
AsRef
,Borrow
has a blanket impl for anyT
, and can be used to accept either a reference or a value. Borrow
also requires thatHash
,Eq
andOrd
for borrowed value are equivalent to those of the owned value. For this reason, if you want to borrow only a single field of a struct you can implementAsRef
, but notBorrow
.
Note: This trait must not fail. If the conversion can fail, use a
dedicated method which returns an Option<T>
or a Result<T, E>
.
Generic Implementations
AsRef
auto-dereferences if the inner type is a reference or a mutable reference (e.g.:foo.as_ref()
will work the same iffoo
has type&mut Foo
or&&mut Foo
)
Examples
By using trait bounds we can accept arguments of different types as long as they can be
converted to the specified type T
.
For example: By creating a generic function that takes an AsRef<str>
we express that we
want to accept all references that can be converted to &str
as an argument.
Since both String
and &str
implement AsRef<str>
we can accept both as input argument.
fn is_hello<T: AsRef<str>>(s: T) { assert_eq!("hello", s.as_ref()); } let s = "hello"; is_hello(s); let s = "hello".to_string(); is_hello(s);
Required methods
fn as_ref(&self) -> &TⓘNotable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
Notable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
Performs the conversion.
Implementations on Foreign Types
impl AsRef<Path> for str
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impl AsRef<OsStr> for str
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impl<'_, T, U> AsRef<U> for &'_ T where
T: AsRef<U> + ?Sized,
U: ?Sized,
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T: AsRef<U> + ?Sized,
U: ?Sized,
fn as_ref(&self) -> &UⓘNotable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
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Notable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
impl<T> AsRef<[T]> for [T]
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impl AsRef<[u8]> for str
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impl<'_, T, U> AsRef<U> for &'_ mut T where
T: AsRef<U> + ?Sized,
U: ?Sized,
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T: AsRef<U> + ?Sized,
U: ?Sized,
fn as_ref(&self) -> &UⓘNotable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
[src]
Notable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
impl AsRef<str> for str
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impl<T, const N: usize> AsRef<[T]> for [T; N]
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impl<A> AsRef<[<A as Array>::Item]> for SmallVec<A> where
A: Array,
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A: Array,
Implementors
impl AsRef<[u8]> for String
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impl AsRef<str> for String
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impl AsRef<CStr> for CStr
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impl AsRef<CStr> for CString
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impl AsRef<OsStr> for String
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impl AsRef<OsStr> for OsStr
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impl AsRef<OsStr> for OsString
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impl AsRef<OsStr> for Path
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impl AsRef<OsStr> for PathBuf
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impl AsRef<Path> for String
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impl AsRef<Path> for OsStr
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impl AsRef<Path> for OsString
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impl AsRef<Path> for Path
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impl AsRef<Path> for PathBuf
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impl AsRef<dyn Op + 'static> for Box<dyn InferenceOp>
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impl AsRef<dyn Op + 'static> for Box<dyn PulsedOp + 'static>
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impl AsRef<dyn Op + 'static> for Box<dyn TypedOp + 'static>
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impl AsRef<dyn Op + 'static> for dyn InferenceOp
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impl AsRef<dyn Op + 'static> for dyn PulsedOp + 'static
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impl AsRef<dyn Op + 'static> for dyn TypedOp + 'static
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impl<'_> AsRef<OsStr> for Component<'_>
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impl<'_> AsRef<OsStr> for Components<'_>
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impl<'_> AsRef<OsStr> for tract_hir::internal::tract_downcast_rs::__std::path::Iter<'_>
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impl<'_> AsRef<Path> for Cow<'_, OsStr>
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impl<'_> AsRef<Path> for Component<'_>
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impl<'_> AsRef<Path> for Components<'_>
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impl<'_> AsRef<Path> for tract_hir::internal::tract_downcast_rs::__std::path::Iter<'_>
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impl<'_, T> AsRef<[T]> for tract_hir::internal::tract_downcast_rs::__std::slice::Iter<'_, T>
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impl<'_, T> AsRef<T> for Cow<'_, T> where
T: ToOwned + ?Sized,
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T: ToOwned + ?Sized,
fn as_ref(&self) -> &TⓘNotable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
[src]
Notable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
impl<'a, T> AsRef<[T]> for Drain<'a, T>
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impl<L, R> AsRef<str> for Either<L, R> where
L: AsRef<str>,
R: AsRef<str>,
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L: AsRef<str>,
R: AsRef<str>,
impl<L, R, Target> AsRef<[Target]> for Either<L, R> where
L: AsRef<[Target]>,
R: AsRef<[Target]>,
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L: AsRef<[Target]>,
R: AsRef<[Target]>,
impl<L, R, Target> AsRef<Target> for Either<L, R> where
L: AsRef<Target>,
R: AsRef<Target>,
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L: AsRef<Target>,
R: AsRef<Target>,
fn as_ref(&self) -> &TargetⓘNotable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
[src]
Notable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
impl<T> AsRef<[T]> for Vec<T>
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impl<T> AsRef<[T]> for IntoIter<T>
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impl<T> AsRef<Vec<T>> for Vec<T>
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impl<T> AsRef<T> for Arc<T> where
T: ?Sized,
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T: ?Sized,
fn as_ref(&self) -> &TⓘNotable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
[src]
Notable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
impl<T> AsRef<T> for Box<T> where
T: ?Sized,
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T: ?Sized,
fn as_ref(&self) -> &TⓘNotable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
[src]
Notable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
impl<T> AsRef<T> for Rc<T> where
T: ?Sized,
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T: ?Sized,
fn as_ref(&self) -> &TⓘNotable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
[src]
Notable traits for &'_ mut R
impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
impl<T, D> AsRef<[SliceOrIndex]> for SliceInfo<T, D> where
D: Dimension,
T: AsRef<[SliceOrIndex]>,
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D: Dimension,
T: AsRef<[SliceOrIndex]>,
fn as_ref(&self) -> &[SliceOrIndex]ⓘ
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impl<T, D> AsRef<SliceInfo<[SliceOrIndex], D>> for SliceInfo<T, D> where
D: Dimension,
T: AsRef<[SliceOrIndex]>,
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D: Dimension,
T: AsRef<[SliceOrIndex]>,