Enum scylla_cql::frame::value::MaybeUnset

source · 
pub enum MaybeUnset<V> {
    Unset,
    Set(V),
}
Expand description

Enum providing a way to represent a value that might be unset

Variants§

§

Unset

§

Set(V)

Trait Implementations§

source§

impl<V: Clone> Clone for MaybeUnset<V>

source§

fn clone(&self) -> MaybeUnset<V>

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
source§

impl<V> Default for MaybeUnset<V>

source§

fn default() -> MaybeUnset<V>

Returns the “default value” for a type. Read more
source§

impl<V: SerializeValue> SerializeValue for MaybeUnset<V>

source§

fn serialize<'b>( &self, typ: &ColumnType<'_>, writer: CellWriter<'b>, ) -> Result<WrittenCellProof<'b>, SerializationError>

Serializes the value to given CQL type. Read more
source§

impl<V: Value> Value for MaybeUnset<V>

source§

fn serialize(&self, buf: &mut Vec<u8>) -> Result<(), ValueTooBig>

👎Deprecated since 0.15.1: Legacy serialization API is not type-safe and is going to be removed soon
source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

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

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

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

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T> CloneToUninit for T
where T: Copy,

source§

unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
source§

impl<T> CloneToUninit for T
where T: Clone,

source§

default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

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

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.

source§

impl<T> Same for T

§

type Output = T

Should always be Self
source§

impl<T> ToOwned for T
where T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

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

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

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

Performs the conversion.
source§

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

§

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

The type returned in the event of a conversion error.
source§

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

Performs the conversion.
source§

impl<T> ErasedDestructor for T
where T: 'static,