Trait sp_core::traits::ExternalitiesExt

pub trait ExternalitiesExt {
    fn extension<T>(&mut self) -> Option<&mut T>
    where
        T: Any + Extension;
    fn register_extension<T>(&mut self, ext: T) -> Result<(), Error>
    where
        T: Extension;
    fn deregister_extension<T>(&mut self) -> Result<(), Error>
    where
        T: Extension;
}

Extension for the Externalities trait.

Required methods

fn extension<T>(&mut self) -> Option<&mut T> where
    T: Any + Extension, 

Tries to find a registered extension and returns a mutable reference.

fn register_extension<T>(&mut self, ext: T) -> Result<(), Error> where
    T: Extension, 

Register extension ext.

Should return error if extension is already registered or extensions are not supported.

fn deregister_extension<T>(&mut self) -> Result<(), Error> where
    T: Extension, 

Deregister and drop extension of T type.

Should return error if extension of type T is not registered or extensions are not supported.

Implementors

impl<'_> ExternalitiesExt for &'_ mut (dyn Externalities + '_)

impl<H, N> ExternalitiesExt for TestExternalities<H, N> where     H: Hasher,     H::Out: Ord + Codec,     N: ChangesTrieBlockNumber,