Struct Registry

pub struct Registry {
    pub tables: Map<dyn Any + Sync>,
}

A registry defining how to cast into some set of traits.

Fields

tables: Map<dyn Any + Sync>

Implementations

impl Registry

pub fn new() -> Registry

Makes a new, empty trait registry.

pub fn insert<DynTrait: ?Sized + 'static>( &mut self, table: CastIntoTrait<DynTrait>, )

Updates the table defining how to cast into the given trait.

pub fn cast_into<To>(&self) -> Option<&CastIntoTrait<To>>

where To: ?Sized + 'static,

Gets the table defining how to cast into the given trait.

This method is designed to be chained with from_mut, from_ref or from_box.

Examples

let x: &dyn Bar = ...;
registry.cast_into::<Foo>()?.from_ref(x)

let x: &mut dyn Bar = ...;
registry.cast_into::<Foo>()?.from_mut(x)

let x: Box<dyn Bar> = ...;
registry.cast_into::<Foo>()?.from_box(x)