Struct Map 

pub struct Map<C, F> { /* private fields */ }

A view collection that transforms views from a source collection using a mapping function.

Map wraps an existing view collection and applies a transformation function to each view when it is accessed, allowing for lazy transformation of views.

Implementations

impl<C, F, V> Map<C, F>

where C: Views, F: Fn(C::View) -> V, V: View,

pub const fn new(source: C, f: F) -> Self

Creates a new Map that transforms views from the source collection.

Parameters

• source - The source view collection to map over
• f - The transformation function to apply to each view

Returns

A new Map instance that will apply the transformation to views

Trait Implementations

impl<C: Clone, F: Clone> Clone for Map<C, F>

fn clone(&self) -> Map<C, F>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<C: Debug, F: Debug> Debug for Map<C, F>

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

Formats the value using the given formatter.

impl<C, F, V> Views for Map<C, F>

where C: Views, F: Clone + Fn(C::View) -> V, V: View,

type Id = <C as Views>::Id

The type of unique identifier for items in the collection. Must implement Hash and Ord to ensure uniqueness and ordering.

type Guard = <C as Views>::Guard

The type of guard returned when registering a watcher.

type View = V

The view type that this collection produces for each element.

fn len(&self) -> usize

Returns the number of items in the collection.

fn get_id(&self, index: usize) -> Option<Self::Id>

Returns the unique identifier for the item at the specified index, or None if out of bounds.

fn get_view(&self, index: usize) -> Option<Self::View>

Returns the view at the specified index, or None if the index is out of bounds.

fn watch( &self, range: impl RangeBounds<usize>, watcher: impl for<'a> Fn(Context<&'a [Self::Id]>) + 'static, ) -> Self::Guard

Registers a watcher for changes in the specified range of the collection.

fn is_empty(&self) -> bool

Returns true if the collection contains no elements.