1.0.0[−][src]Trait bevy_ecs::lazy_static::__Deref
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
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impl<T> Deref for AssertUnwindSafe<T>
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impl<'a> Deref for IoSliceMut<'a>
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impl<'_, T> Deref for RwLockReadGuard<'_, T> where
T: ?Sized,
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T: ?Sized,
impl<'_, T> Deref for MutexGuard<'_, T> where
T: ?Sized,
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T: ?Sized,
impl<'a> Deref for IoSlice<'a>
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impl Deref for OsString
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impl<'_, T> Deref for RwLockWriteGuard<'_, T> where
T: ?Sized,
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T: ?Sized,
impl<T, F> Deref for SyncLazy<T, F> where
F: FnOnce() -> T,
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F: FnOnce() -> T,
impl Deref for CString
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impl Deref for PathBuf
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impl<T, F> Deref for Lazy<T, F> where
F: FnOnce() -> T,
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F: FnOnce() -> T,
impl<'_, T> Deref for &'_ mut T where
T: ?Sized,
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T: ?Sized,
impl<'a, 'f> Deref for VaList<'a, 'f> where
'f: 'a,
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'f: 'a,
type Target = VaListImpl<'f>
fn deref(&self) -> &VaListImpl<'f>
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impl<'_, T> Deref for RefMut<'_, T> where
T: ?Sized,
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T: ?Sized,
impl<T> Deref for ManuallyDrop<T> where
T: ?Sized,
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T: ?Sized,
impl<P> Deref for Pin<P> where
P: Deref,
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P: Deref,
impl<'_, T> Deref for &'_ T where
T: ?Sized,
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T: ?Sized,
impl<'_, T> Deref for Ref<'_, T> where
T: ?Sized,
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T: ?Sized,
impl<T> Deref for Arc<T> where
T: ?Sized,
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T: ?Sized,
impl<T> Deref for Box<T> where
T: ?Sized,
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T: ?Sized,
impl<T> Deref for Rc<T> where
T: ?Sized,
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T: ?Sized,
impl<'_, T> Deref for PeekMut<'_, T> where
T: Ord,
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T: Ord,
impl<T> Deref for Vec<T>
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impl Deref for String
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impl<'_, B> Deref for Cow<'_, B> where
B: ToOwned + ?Sized,
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B: ToOwned + ?Sized,
impl<'input, Endian> Deref for EndianSlice<'input, Endian> where
Endian: Endianity,
Endian: Endianity,
impl<'rwlock, T> Deref for RwLockWriteGuard<'rwlock, T> where
T: ?Sized,
T: ?Sized,
impl<'a, T> Deref for MutexGuard<'a, T> where
T: ?Sized,
T: ?Sized,
impl<'rwlock, T> Deref for RwLockUpgradeableGuard<'rwlock, T> where
T: ?Sized,
T: ?Sized,
impl<'rwlock, T> Deref for RwLockReadGuard<'rwlock, T> where
T: ?Sized,
T: ?Sized,
impl<'a, T> Deref for ShardedLockReadGuard<'a, T> where
T: ?Sized,
T: ?Sized,
impl<T> Deref for CachePadded<T>
impl<'a, T> Deref for ShardedLockWriteGuard<'a, T> where
T: ?Sized,
T: ?Sized,
impl<'a, R, T> Deref for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + ?Sized,
R: 'a + RawRwLock,
T: 'a + ?Sized,
impl<'a, R, G, T> Deref for ReentrantMutexGuard<'a, R, G, T> where
G: 'a + GetThreadId,
R: 'a + RawMutex,
T: 'a + ?Sized,
G: 'a + GetThreadId,
R: 'a + RawMutex,
T: 'a + ?Sized,
impl<'a, R, T> Deref for MappedRwLockReadGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + ?Sized,
R: 'a + RawRwLock,
T: 'a + ?Sized,
impl<'a, R, T> Deref for MutexGuard<'a, R, T> where
R: 'a + RawMutex,
T: 'a + ?Sized,
R: 'a + RawMutex,
T: 'a + ?Sized,
impl<'a, R, T> Deref for RwLockUpgradableReadGuard<'a, R, T> where
R: 'a + RawRwLockUpgrade,
T: 'a + ?Sized,
R: 'a + RawRwLockUpgrade,
T: 'a + ?Sized,
impl<'a, R, T> Deref for MappedMutexGuard<'a, R, T> where
R: 'a + RawMutex,
T: 'a + ?Sized,
R: 'a + RawMutex,
T: 'a + ?Sized,
impl<'a, R, G, T> Deref for MappedReentrantMutexGuard<'a, R, G, T> where
G: 'a + GetThreadId,
R: 'a + RawMutex,
T: 'a + ?Sized,
G: 'a + GetThreadId,
R: 'a + RawMutex,
T: 'a + ?Sized,
impl<'a, R, T> Deref for RwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + ?Sized,
R: 'a + RawRwLock,
T: 'a + ?Sized,
impl<'a, R, T> Deref for RwLockReadGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + ?Sized,
R: 'a + RawRwLock,
T: 'a + ?Sized,
impl<T, F, S> Deref for ScopeGuard<T, F, S> where
F: FnOnce(T),
S: Strategy,
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F: FnOnce(T),
S: Strategy,
impl<A> Deref for SmallVec<A> where
A: Array,
A: Array,
impl<L, R> Deref for Either<L, R> where
L: Deref,
R: Deref<Target = <L as Deref>::Target>,
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L: Deref,
R: Deref<Target = <L as Deref>::Target>,
impl<T> Deref for Owned<T>
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Implementors
impl<'a, T> Deref for Added<'a, T> where
T: Component,
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T: Component,
impl<'a, T> Deref for Changed<'a, T> where
T: Component,
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T: Component,
impl<'a, T> Deref for Mut<'a, T> where
T: Component,
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T: Component,
impl<'a, T> Deref for Mutated<'a, T> where
T: Component,
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T: Component,
impl<'a, T> Deref for bevy_ecs::prelude::Ref<'a, T> where
T: Component,
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T: Component,
impl<'a, T> Deref for bevy_ecs::prelude::RefMut<'a, T> where
T: Component,
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T: Component,