Trait sp_externalities::ExtensionStore

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pub trait ExtensionStore {
    // Required methods
    fn extension_by_type_id(&mut self, type_id: TypeId) -> Option<&mut dyn Any>;
    fn register_extension_with_type_id(
        &mut self,
        type_id: TypeId,
        extension: Box<dyn Extension>,
    ) -> Result<(), Error>;
    fn deregister_extension_by_type_id(
        &mut self,
        type_id: TypeId,
    ) -> Result<(), Error>;
}
Expand description

Something that provides access to the Extensions store.

This is a super trait of the Externalities.

Required Methods§

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fn extension_by_type_id(&mut self, type_id: TypeId) -> Option<&mut dyn Any>

Tries to find a registered extension by the given type_id and returns it as a &mut dyn Any.

It is advised to use ExternalitiesExt::extension instead of this function to get type system support and automatic type downcasting.

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fn register_extension_with_type_id( &mut self, type_id: TypeId, extension: Box<dyn Extension>, ) -> Result<(), Error>

Register extension extension with specified type_id.

It should return error if extension is already registered.

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fn deregister_extension_by_type_id( &mut self, type_id: TypeId, ) -> Result<(), Error>

Deregister extension with specified ‘type_id’ and drop it.

It should return error if extension is not registered.

Implementors§