pub enum MaybeUnset<V> {
Unset,
Set(V),
}Expand description
Enum providing a way to represent a value that might be unset
Variants§
Unset
The value is unset, so the server’s state about this value will not be changed.
Set(V)
The value is set, so the server’s state will be changed to this value.
Implementations§
Source§impl<V> MaybeUnset<V>
impl<V> MaybeUnset<V>
Sourcepub fn from_option(opt: Option<V>) -> Self
pub fn from_option(opt: Option<V>) -> Self
Converts an Option<V> into a MaybeUnset<V>.
Trait Implementations§
Source§impl<V: Clone> Clone for MaybeUnset<V>
impl<V: Clone> Clone for MaybeUnset<V>
Source§fn clone(&self) -> MaybeUnset<V>
fn clone(&self) -> MaybeUnset<V>
Returns a copy of the value. Read more
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source. Read moreSource§impl<V: Debug> Debug for MaybeUnset<V>
impl<V: Debug> Debug for MaybeUnset<V>
Source§impl<V> Default for MaybeUnset<V>
impl<V> Default for MaybeUnset<V>
Source§fn default() -> MaybeUnset<V>
fn default() -> MaybeUnset<V>
Returns the “default value” for a type. Read more
Source§impl<V: SerializeValue> SerializeValue for MaybeUnset<V>
impl<V: SerializeValue> SerializeValue for MaybeUnset<V>
Source§fn serialize<'b>(
&self,
typ: &ColumnType<'_>,
writer: CellWriter<'b>,
) -> Result<WrittenCellProof<'b>, SerializationError>
fn serialize<'b>( &self, typ: &ColumnType<'_>, writer: CellWriter<'b>, ) -> Result<WrittenCellProof<'b>, SerializationError>
Serializes the value to given CQL type. Read more
impl<V: Copy> Copy for MaybeUnset<V>
Auto Trait Implementations§
impl<V> Freeze for MaybeUnset<V>where
V: Freeze,
impl<V> RefUnwindSafe for MaybeUnset<V>where
V: RefUnwindSafe,
impl<V> Send for MaybeUnset<V>where
V: Send,
impl<V> Sync for MaybeUnset<V>where
V: Sync,
impl<V> Unpin for MaybeUnset<V>where
V: Unpin,
impl<V> UnwindSafe for MaybeUnset<V>where
V: UnwindSafe,
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> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
Source§impl<T> IntoEither for T
impl<T> IntoEither for T
Source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
Converts
self into a Left variant of Either<Self, Self>
if into_left is true.
Converts self into a Right variant of Either<Self, Self>
otherwise. Read moreSource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
Converts
self into a Left variant of Either<Self, Self>
if into_left(&self) returns true.
Converts self into a Right variant of Either<Self, Self>
otherwise. Read more