Struct xylem::DefaultContext

pub struct DefaultContext { /* fields omitted */ }

A Context implementation based on typemap::TypeMap.

Trait Implementations

impl Context for DefaultContext

type Scope = Scope

Identifies a layer of scope.

fn start_scope<T: 'static>(&mut self) -> Scope

Pushes the type to the scope stack.

fn end_scope(&mut self, scope: Scope)

Pops a type from the scope stack.

fn nth_last_scope(&self, n: usize) -> Option<TypeId>

Gets the nth topmost scope type ID.

fn get<T>(&self, scope: TypeId) -> Option<&T> where
    T: 'static, 

Gets a shared reference to the storage of type T in the newest layer of the scope.

fn get_each<T>(&self) -> Box<dyn Iterator<Item = &T>> where
    T: 'static, 

Gets a shared reference to the storage of type T in each layer, from top to bottom, if exists.

fn get_mut<T, F>(&mut self, scope: TypeId, default: F) -> &mut T where
    F: FnOnce() -> T,
    T: 'static, 

Gets a mutable reference to the storage of type T in the newest layer of the scope.

impl Default for DefaultContext

fn default() -> Self

Returns the “default value” for a type.