#[non_exhaustive]pub enum MaybeCached<'a, T: 'a> {
CannotCache(T),
Cached(&'a mut T),
}
Available on crate feature
i-implement-a-third-party-backend-and-opt-into-breaking-changes
only.Expand description
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.
CannotCache(T)
Contains a not cached prepared statement
Cached(&'a mut T)
Contains a reference cached prepared statement
Trait Implementations§
Source§impl<T> Deref for MaybeCached<'_, T>
impl<T> Deref for MaybeCached<'_, T>
Auto Trait Implementations§
impl<'a, T> Freeze for MaybeCached<'a, T>where
T: Freeze,
impl<'a, T> RefUnwindSafe for MaybeCached<'a, T>where
T: RefUnwindSafe,
impl<'a, T> Send for MaybeCached<'a, T>where
T: Send,
impl<'a, T> Sync for MaybeCached<'a, T>where
T: Sync,
impl<'a, T> Unpin for MaybeCached<'a, T>where
T: Unpin,
impl<'a, T> !UnwindSafe for MaybeCached<'a, T>
Blanket Implementations§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
Source§impl<T> Downcast for Twhere
T: Any,
impl<T> Downcast for Twhere
T: Any,
Source§fn into_any(self: Box<T>) -> Box<dyn Any>
fn into_any(self: Box<T>) -> Box<dyn Any>
Convert
Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
.Source§fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
Convert
Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
.Source§fn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
Convert
&Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s.Source§fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert
&mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s.