Struct PartialOptionalKeyPath 

pub struct PartialOptionalKeyPath<Root> { /* private fields */ }

PartialOptionalKeyPath - Hides the Value type but keeps Root visible Useful for storing optional keypaths in collections without knowing the exact Value type

Why PhantomData?

See PartialKeyPath documentation for explanation of why PhantomData is needed.

Implementations

impl<Root> PartialOptionalKeyPath<Root>

pub fn new<Value>( keypath: OptionalKeyPath<Root, Value, impl for<'r> Fn(&'r Root) -> Option<&'r Value> + 'static>, ) -> Self

where Value: Any + 'static, Root: 'static,

pub fn get<'r>(&self, root: &'r Root) -> Option<&'r dyn Any>

pub fn value_type_id(&self) -> TypeId

Get the TypeId of the Value type

pub fn get_as<'a, Value: Any>( &self, root: &'a Root, ) -> Option<Option<&'a Value>>

Try to downcast the result to a specific type

pub fn then<MidValue>( self, next: PartialOptionalKeyPath<MidValue>, ) -> PartialOptionalKeyPath<Root>

where MidValue: Any + 'static, Root: 'static,

Chain with another PartialOptionalKeyPath Note: This requires the Value type of the first keypath to match the Root type of the second For type-erased chaining, consider using AnyKeyPath instead

Trait Implementations

impl<Root: Clone> Clone for PartialOptionalKeyPath<Root>

fn clone(&self) -> PartialOptionalKeyPath<Root>

Returns a duplicate of the value.

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

Performs copy-assignment from source.