Trait sp_externalities::Extension

pub trait Extension: Send + 'static {
    // Required methods
    fn as_mut_any(&mut self) -> &mut dyn Any;
    fn type_id(&self) -> TypeId;
}

Marker trait for types that should be registered as Externalities extension.

As extensions are stored as Box<Any>, this trait should give more confidence that the correct type is registered and requested.

Required Methods

fn as_mut_any(&mut self) -> &mut dyn Any

Return the extension as &mut dyn Any.

This is a trick to make the trait type castable into an Any.

fn type_id(&self) -> TypeId

Get the TypeId of this Extension.

Trait Implementations

impl Extension for Box<dyn Extension>

fn as_mut_any(&mut self) -> &mut dyn Any

Return the extension as &mut dyn Any.

fn type_id(&self) -> TypeId

Get the TypeId of this Extension.

Implementations on Foreign Types

impl Extension for Box<dyn Extension>

fn as_mut_any(&mut self) -> &mut dyn Any

fn type_id(&self) -> TypeId

Implementors