Enum MaybeUnset

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pub enum MaybeUnset<V> {
    Unset,
    Set(V),
}

Expand description

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

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Unset

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Set(V)

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

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

Returns a copy of the value. Read more

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

Performs copy-assignment from source. Read more

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impl<V> Default for MaybeUnset<V>

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fn default() -> MaybeUnset<V>

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

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impl<V> SerializeCql for MaybeUnset<V>
where V: SerializeCql,

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

Serializes the value to given CQL type. Read more

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

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

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impl<V> Copy for MaybeUnset<V>
where V: Copy,

Auto Trait Implementations§

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impl<V> UnwindSafe for MaybeUnset<V>
where V: UnwindSafe,

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,

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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,

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

Mutably borrows from an owned value. Read more

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

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)

Performs copy-assignment from self to dst. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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

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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> IntoEither for T

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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 more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

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

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