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ExternalitiesExt

sp_externalities

Trait ExternalitiesExt 

Source 
pub trait ExternalitiesExt {
    // Required methods
    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>;
}
Expand description

Extension for the Externalities trait.

Required Methods§

Source

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

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

Source

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

Register extension ext.

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

Source

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

Deregister and drop extension of T type.

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

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§