[−][src]Enum managed::Managed
A managed object.
This enum can be used to represent exclusive access to objects. In Rust, exclusive access to an object is obtained by either owning the object, or owning a mutable pointer to the object; hence, "managed".
The purpose of this enum is providing good ergonomics with std
present while making
it possible to avoid having a heap at all (which of course means that std
is not present).
To achieve this, the variants other than Borrow
are only available when the corresponding
feature is opted in.
A function that requires a managed object should be generic over an Into<Managed<'a, T>>
argument; then, it will be possible to pass either a Box<T>
, Vec<T>
, or a &'a mut T
without any conversion at the call site.
Note that a Vec<T>
converted into an Into<Managed<'a, [T]>>
gets transformed
into a boxed slice, and can no longer be resized. See also
ManagedSlice, which does not have this drawback.
Variants
Borrowed(&'a mut T)
Borrowed variant.
Owned(Box<T>)
Owned variant, only available with the std
or alloc
feature enabled.
Trait Implementations
impl<'a, T: 'a + ?Sized> Debug for Managed<'a, T> where
T: Debug,
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T: Debug,
impl<'a, T: 'a + ?Sized> Deref for Managed<'a, T>
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impl<'a, T: 'a + ?Sized> DerefMut for Managed<'a, T>
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impl<'a, T: 'a + ?Sized> From<&'a mut T> for Managed<'a, T>
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impl<'a, T: ?Sized + 'a> From<Box<T>> for Managed<'a, T>
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impl<'a, T: 'a> From<Vec<T>> for Managed<'a, [T]>
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Auto Trait Implementations
impl<'a, T: ?Sized> RefUnwindSafe for Managed<'a, T> where
T: RefUnwindSafe,
T: RefUnwindSafe,
impl<'a, T: ?Sized> Send for Managed<'a, T> where
T: Send,
T: Send,
impl<'a, T: ?Sized> Sync for Managed<'a, T> where
T: Sync,
T: Sync,
impl<'a, T: ?Sized> Unpin for Managed<'a, T>
impl<'a, T> !UnwindSafe for Managed<'a, T>
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,