Trait sp_externalities::ExternalitiesExt [−][src]
pub trait ExternalitiesExt {
fn extension<T: Any + Extension>(&mut self) -> Option<&mut T>;
fn register_extension<T: Extension>(&mut self, ext: T) -> Result<(), Error>;
fn deregister_extension<T: Extension>(&mut self) -> Result<(), Error>;
}Extension for the Externalities trait.
Required methods
fn extension<T: Any + Extension>(&mut self) -> Option<&mut T>[src]
Tries to find a registered extension and returns a mutable reference.
fn register_extension<T: Extension>(&mut self, ext: T) -> Result<(), Error>[src]
Register extension ext.
Should return error if extension is already registered or extensions are not supported.
fn deregister_extension<T: Extension>(&mut self) -> Result<(), Error>[src]
Deregister and drop extension of T type.
Should return error if extension of type T is not registered or
extensions are not supported.
Implementors
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