Struct OptionObserver 

pub struct OptionObserver<'ob, O, S: ?Sized, D = Zero> { /* private fields */ }

Observer implementation for Option<T>.

This observer tracks changes to optional values, including transitions between Some and None states. It provides specialized methods for working with options while maintaining change tracking.

Implementations

impl<'ob, O, S, D> OptionObserver<'ob, O, S, D>

where D: Unsigned, S: AsDerefMut<D, Target = Option<O::Head>> + 'ob + ?Sized, O: Observer<'ob, InnerDepth = Zero>, O::Head: Sized,

pub fn as_mut(&mut self) -> Option<&mut O>

See Option::as_mut.

pub fn insert(&mut self, value: O::Head) -> &mut O

See Option::insert.

pub fn get_or_insert(&mut self, value: O::Head) -> &mut O

See Option::get_or_insert.

pub fn get_or_insert_default(&mut self) -> &mut O

where O::Head: Default,

See Option::get_or_insert_default.

pub fn get_or_insert_with<F>(&mut self, f: F) -> &mut O

where F: FnOnce() -> O::Head,

See Option::get_or_insert_with.

Trait Implementations

impl<'ob, O, S: ?Sized, D> AsNormalized for OptionObserver<'ob, O, S, D>

type OuterDepth = Succ<Zero>

The number of outer dereference layers to reach the normalized value.

fn as_normalized_ref(&self) -> &Self::Target

Returns a normalized reference to the underlying value.

fn as_normalized_mut(&mut self) -> &mut Self::Target

where Self: AsDerefMutCoinductive<Self::OuterDepth>,

Returns a normalized mutable reference to the underlying value.

impl<'ob, O, S, D> Debug for OptionObserver<'ob, O, S, D>

where D: Unsigned, S: AsDerefMut<D, Target: Debug> + ?Sized,

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'ob, O, S: ?Sized, D> Deref for OptionObserver<'ob, O, S, D>

type Target = Pointer<S>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'ob, O, S: ?Sized, D> DerefMut for OptionObserver<'ob, O, S, D>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<'ob, O, S, D> Observer<'ob> for OptionObserver<'ob, O, S, D>

where D: Unsigned, S: AsDerefMut<D, Target = Option<O::Head>> + 'ob + ?Sized, O: Observer<'ob, InnerDepth = Zero>, O::Head: Sized,

type InnerDepth = D

Type-level number of dereferences from Head to the observed type.

type Head = S

The head type of the dereference chain.

fn uninit() -> Self

Creates an uninitialized observer.

unsafe fn refresh(this: &mut Self, value: &mut Self::Head)

Refreshes the observer’s internal pointer after the observed value has moved.

fn observe(value: &'ob mut Self::Head) -> Self

Creates a new observer for the given value.

unsafe fn force(this: &mut Self, value: &'ob mut Self::Head)

Forces the observer into a valid state for the given value.

fn as_inner<'i>( this: &Self, ) -> &'i mut <Self::Head as AsDeref<Self::InnerDepth>>::Target

where Self::Head: AsDerefMut<Self::InnerDepth>, 'ob: 'i,

Gets a mutable reference to the inner observed value without triggering observation.

fn track_inner<'i>( this: &mut Self, ) -> &'i mut <Self::Head as AsDeref<Self::InnerDepth>>::Target

where Self::Head: AsDerefMut<Self::InnerDepth>, 'ob: 'i,

Gets a mutable reference to the inner observed value while triggering observation.

impl<'ob, O, S, D, U: ?Sized> PartialEq<U> for OptionObserver<'ob, O, S, D>

where D: Unsigned, S: AsDerefMut<D, Target: PartialEq<U>> + ?Sized,

fn eq(&self, other: &U) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'ob, O, S, D, U: ?Sized> PartialOrd<U> for OptionObserver<'ob, O, S, D>

where D: Unsigned, S: AsDerefMut<D, Target: PartialOrd<U>> + ?Sized,

fn partial_cmp(&self, other: &U) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'ob, O, S, D> SerializeObserver<'ob> for OptionObserver<'ob, O, S, D>

where D: Unsigned, S: AsDerefMut<D, Target = Option<O::Head>> + 'ob + ?Sized, O: SerializeObserver<'ob, InnerDepth = Zero>, O::Head: Serialize + Sized,

unsafe fn flush_unchecked<A: Adapter>( this: &mut Self, ) -> Result<Mutations<A::Value>, A::Error>

Flushes and serializes all recorded mutations (unsafe version).

fn flush<A: Adapter>(this: &mut Self) -> Result<Mutations<A::Value>, A::Error>

Flushes and serializes all recorded mutations using the specified adapter.