Trait otter_api_tests::Deref 1.0.0[−][src]
Expand description
Used for immutable dereferencing operations, like *v
.
In addition to being used for explicit dereferencing operations with the
(unary) *
operator in immutable contexts, Deref
is also used implicitly
by the compiler in many circumstances. This mechanism is called
‘Deref
coercion’. In mutable contexts, DerefMut
is used.
Implementing Deref
for smart pointers makes accessing the data behind them
convenient, which is why they implement Deref
. On the other hand, the
rules regarding Deref
and DerefMut
were designed specifically to
accommodate smart pointers. Because of this, Deref
should only be
implemented for smart pointers to avoid confusion.
For similar reasons, this trait should never fail. Failure during
dereferencing can be extremely confusing when Deref
is invoked implicitly.
More on Deref
coercion
If T
implements Deref<Target = U>
, and x
is a value of type T
, then:
- In immutable contexts,
*x
(whereT
is neither a reference nor a raw pointer) is equivalent to*Deref::deref(&x)
. - Values of type
&T
are coerced to values of type&U
T
implicitly implements all the (immutable) methods of the typeU
.
For more details, visit the chapter in The Rust Programming Language as well as the reference sections on the dereference operator, method resolution and type coercions.
Examples
A struct with a single field which is accessible by dereferencing the struct.
use std::ops::Deref; struct DerefExample<T> { value: T } impl<T> Deref for DerefExample<T> { type Target = T; fn deref(&self) -> &Self::Target { &self.value } } let x = DerefExample { value: 'a' }; assert_eq!('a', *x);
Associated Types
Required methods
Implementations on Foreign Types
impl Deref for Literal
impl Deref for Literal
type Target = SystemTime
impl<'input, Endian> Deref for EndianSlice<'input, Endian> where
Endian: Endianity,
impl<'input, Endian> Deref for EndianSlice<'input, Endian> where
Endian: Endianity,
impl Deref for IoVec
impl Deref for IoVec
impl<A> Deref for SmallVec<A> where
A: Array,
impl<A> Deref for SmallVec<A> where
A: Array,
impl<A> Deref for ArrayVec<A> where
A: Array,
impl<A> Deref for ArrayVec<A> where
A: Array,
impl<'s, T> Deref for SliceVec<'s, T>
impl<'s, T> Deref for SliceVec<'s, T>
impl<A> Deref for TinyVec<A> where
A: Array,
impl<A> Deref for TinyVec<A> where
A: Array,
impl Deref for BString
impl Deref for BString
impl Deref for BStr
impl Deref for BStr
type Target = Asn1BitStringRef
type Target = GeneralNameRef
type Target = X509StoreBuilderRef
type Target = X509ReqRef
type Target = OcspRequestRef
type Target = X509VerifyParamRef
type Target = SrtpProtectionProfileRef
type Target = X509ObjectRef
type Target = X509NameEntryRef
type Target = EcdsaSigRef
type Target = EcPointRef
type Target = OcspOneReqRef
type Target = Asn1GeneralizedTimeRef
type Target = X509AlgorithmRef
type Target = SslSessionRef
type Target = SslContextBuilder
type Target = OcspBasicResponseRef
type Target = Asn1StringRef
type Target = X509LookupMethodRef<T>
type Target = Asn1TimeRef
type Target = BigNumContextRef
type Target = X509NameRef
type Target = Asn1ObjectRef
type Target = SslCipherRef
type Target = OcspResponseRef
type Target = OpensslStringRef
type Target = X509ExtensionRef
type Target = AccessDescriptionRef
type Target = X509LookupRef<T>
type Target = X509StoreContextRef
type Target = EcGroupRef
type Target = SslContextRef
type Target = OcspCertIdRef
type Target = X509StoreRef
type Target = Asn1IntegerRef
type Target = SslContextBuilder
type Target = CmsContentInfoRef
Implementors
type Target = ZipArchive<BufReader<File>>
type Target = Arc<dyn PlayerAccessSpec + 'static>
type Target = DenseSlotMap<PieceId, GPiece>
type Target = IPieceTraitObj
type Target = VaListImpl<'f>
impl<'a, R, G, T> Deref for MappedReentrantMutexGuard<'a, R, G, T> where
T: 'a + ?Sized,
G: 'a + GetThreadId,
R: 'a + RawMutex,
impl<'a, R, G, T> Deref for MappedReentrantMutexGuard<'a, R, G, T> where
T: 'a + ?Sized,
G: 'a + GetThreadId,
R: 'a + RawMutex,
impl<'a, R, G, T> Deref for ReentrantMutexGuard<'a, R, G, T> where
T: 'a + ?Sized,
G: 'a + GetThreadId,
R: 'a + RawMutex,
impl<'a, R, G, T> Deref for ReentrantMutexGuard<'a, R, G, T> where
T: 'a + ?Sized,
G: 'a + GetThreadId,
R: 'a + RawMutex,
impl<'a, R, T> Deref for otter_api_tests::imports::parking_lot::lock_api::MappedMutexGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawMutex,
impl<'a, R, T> Deref for otter_api_tests::imports::parking_lot::lock_api::MappedMutexGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawMutex,
impl<'a, R, T> Deref for MappedRwLockReadGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawRwLock,
impl<'a, R, T> Deref for MappedRwLockReadGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawRwLock,
impl<'a, R, T> Deref for MappedRwLockWriteGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawRwLock,
impl<'a, R, T> Deref for MappedRwLockWriteGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawRwLock,
impl<'a, R, T> Deref for otter_api_tests::imports::parking_lot::lock_api::MutexGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawMutex,
impl<'a, R, T> Deref for otter_api_tests::imports::parking_lot::lock_api::MutexGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawMutex,
impl<'a, R, T> Deref for otter_api_tests::imports::parking_lot::lock_api::RwLockReadGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawRwLock,
impl<'a, R, T> Deref for otter_api_tests::imports::parking_lot::lock_api::RwLockReadGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawRwLock,
impl<'a, R, T> Deref for RwLockUpgradableReadGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawRwLockUpgrade,
impl<'a, R, T> Deref for RwLockUpgradableReadGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawRwLockUpgrade,
impl<'a, R, T> Deref for otter_api_tests::imports::parking_lot::lock_api::RwLockWriteGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawRwLock,
impl<'a, R, T> Deref for otter_api_tests::imports::parking_lot::lock_api::RwLockWriteGuard<'a, R, T> where
T: 'a + ?Sized,
R: 'a + RawRwLock,
type Target = IndexSlice<I, [A]>
pub fn deref(&self) -> &IndexSlice<I, [A]>
impl<T> Deref for OrderedFloat<T> where
T: Float,
impl<T> Deref for OrderedFloat<T> where
T: Float,
type Target = T
pub fn deref(&self) -> &<OrderedFloat<T> as Deref>::Target
impl<T, N> Deref for GenericArray<T, N> where
N: ArrayLength<T>,
impl<T, N> Deref for GenericArray<T, N> where
N: ArrayLength<T>,