Enum lmdb_zero::MaybeOwned

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

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

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

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

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

type Target = T

The resulting type after dereferencing.

Important traits for &'a mut W

impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

fn deref(&self) -> &T

Dereferences the value.

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

Important traits for &'a mut W

impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

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

Mutably dereferences the value.