Enum ord_lmdb_zero::MaybeOwned

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pub enum MaybeOwned<'a, T: 'a> {
    Owned(T),
    Borrowed(&'a mut T),
}

Expand description

A mutable value which is either owned or borrowed from an owning context.

This is very different from Cow in that one can mutate the shared reference but cannot take ownership.

Variants

`Owned(T)`

`Borrowed(&'a mut T)`

Trait Implementations

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impl<'a, T: Debug + 'a> Debug for MaybeOwned<'a, T>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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impl<'a, T: 'a> Deref for MaybeOwned<'a, T>

type Target = T

The resulting type after dereferencing.

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fn deref(&self) -> &T

Dereferences the value.

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impl<'a, T: 'a> DerefMut for MaybeOwned<'a, T>

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fn deref_mut(&mut self) -> &mut T

Mutably dereferences the value.

Auto Trait Implementations

impl<'a, T> RefUnwindSafe for MaybeOwned<'a, T> where
T: RefUnwindSafe,

impl<'a, T> Send for MaybeOwned<'a, T> where
T: Send,

impl<'a, T> Sync for MaybeOwned<'a, T> where
T: Sync,

impl<'a, T> Unpin for MaybeOwned<'a, T> where
T: Unpin,

impl<'a, T> !UnwindSafe for MaybeOwned<'a, T>

Blanket Implementations

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impl<T> Any for T where
T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T where
U: From<T>,

const: unstable · source

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> SafeBorrow<T> for T where
T: ?Sized,

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fn borrow_replacement(ptr: &T) -> &T

Given ptr, which was obtained from a prior call to Self::borrow(), return a value with the same nominal lifetime which is guaranteed to survive mutations to Self. Read more

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impl<T, U> TryFrom for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

Enum ord_lmdb_zero::MaybeOwned

Variants

`Owned(T)`

`Borrowed(&'a mut T)`

Trait Implementations

impl<'a, T: Debug + 'a> Debug for MaybeOwned<'a, T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

impl<'a, T: 'a> Deref for MaybeOwned<'a, T>

type Target = T

fn deref(&self) -> &T

impl<'a, T: 'a> DerefMut for MaybeOwned<'a, T>

fn deref_mut(&mut self) -> &mut T

Auto Trait Implementations

impl<'a, T> RefUnwindSafe for MaybeOwned<'a, T> where
T: RefUnwindSafe,

impl<'a, T> Send for MaybeOwned<'a, T> where
T: Send,

impl<'a, T> Sync for MaybeOwned<'a, T> where
T: Sync,

impl<'a, T> Unpin for MaybeOwned<'a, T> where
T: Unpin,

impl<'a, T> !UnwindSafe for MaybeOwned<'a, T>

Blanket Implementations

impl<T> Any for T where
T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where
T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where
T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for T where
U: From<T>,

fn into(self) -> U

impl<T> SafeBorrow<T> for T where
T: ?Sized,

fn borrow_replacement(ptr: &T) -> &T

impl<T, U> TryFrom<U> for T where
U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Enum ord_lmdb_zero::MaybeOwned

Variants

Owned(T)

Borrowed(&'a mut T)

Trait Implementations

impl<'a, T: Debug + 'a> Debug for MaybeOwned<'a, T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

impl<'a, T: 'a> Deref for MaybeOwned<'a, T>

type Target = T

fn deref(&self) -> &T

impl<'a, T: 'a> DerefMut for MaybeOwned<'a, T>

fn deref_mut(&mut self) -> &mut T

Auto Trait Implementations

impl<'a, T> RefUnwindSafe for MaybeOwned<'a, T> where T: RefUnwindSafe,

impl<'a, T> Send for MaybeOwned<'a, T> where T: Send,

impl<'a, T> Sync for MaybeOwned<'a, T> where T: Sync,

impl<'a, T> Unpin for MaybeOwned<'a, T> where T: Unpin,

impl<'a, T> !UnwindSafe for MaybeOwned<'a, T>

Blanket Implementations

impl<T> Any for T where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for T where U: From<T>,

fn into(self) -> U

impl<T> SafeBorrow<T> for T where T: ?Sized,

fn borrow_replacement(ptr: &T) -> &T

impl<T, U> TryFrom<U> for T where U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

`Owned(T)`

`Borrowed(&'a mut T)`

impl<'a, T> RefUnwindSafe for MaybeOwned<'a, T> where
T: RefUnwindSafe,

impl<'a, T> Send for MaybeOwned<'a, T> where
T: Send,

impl<'a, T> Sync for MaybeOwned<'a, T> where
T: Sync,

impl<'a, T> Unpin for MaybeOwned<'a, T> where
T: Unpin,

impl<T> Any for T where
T: 'static + ?Sized,

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

impl<T, U> Into<U> for T where
U: From<T>,

impl<T> SafeBorrow<T> for T where
T: ?Sized,

impl<T, U> TryFrom<U> for T where
U: Into<T>,

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,