[][src]Trait sp_externalities::Extension

pub trait Extension: Send + Any {
    pub fn as_mut_any(&mut self) -> &mut dyn Any;

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

pub fn as_mut_any(&mut self) -> &mut dyn Any[src]

Return the extension as &mut dyn Any.

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

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