Struct CtxMapView 

pub struct CtxMapView<'a, S: Schema>(/* private fields */);

Mutable reference to CtxMap where the value has changed.

Use CtxMapViwe instead of &mut CtxMap because &mut CtxMap, whose value has been changed, will be broken if std::mem::swap is used.

Implementations

impl<'a, S: Schema> CtxMapView<'a, S>

pub fn with<T: ?Sized + 'static, U>( &mut self, key: &'static Key<S, T>, value: &T, f: impl FnOnce(&mut CtxMapView<'_, S>) -> U, ) -> U

Sets a value to CtxMap only while f is being called.

See CtxMap::with for more details.

pub fn with_mut<T: ?Sized + 'static, U, const MUT: bool>( &mut self, key: &'static Key<S, T, MUT>, value: &mut T, f: impl FnOnce(&mut CtxMapView<'_, S>) -> U, ) -> U

Sets a mutable value to CtxMap only while f is being called.

See CtxMap::with_mut for more details.

pub fn view(&mut self) -> CtxMapView<'_, S>

Return CtxMapView with modified lifetime.

pub fn get<T: ?Sized, const MUT: bool>( &self, key: &'static Key<S, T, MUT>, ) -> Option<&T>

Returns a reference to the value corresponding to the key.

See CtxMap::get for more details.

pub fn get_mut<T: ?Sized>( &mut self, key: &'static KeyMut<S, T>, ) -> Option<&mut T>

Returns a mutable reference to the value corresponding to the key.

See CtxMap::get_mut for more details.

Trait Implementations

impl<'a, S, T, const MUT: bool> Index<&'static Key<S, T, MUT>> for CtxMapView<'a, S>

where S: Schema, T: ?Sized + 'static,

type Output = T

The returned type after indexing.

fn index(&self, index: &'static Key<S, T, MUT>) -> &Self::Output

Performs the indexing (container[index]) operation.

impl<'a, S, T> IndexMut<&'static Key<S, T, true>> for CtxMapView<'a, S>

where S: Schema, T: ?Sized + 'static,

fn index_mut(&mut self, index: &'static KeyMut<S, T>) -> &mut Self::Output

Performs the mutable indexing (container[index]) operation.