Struct sp_externalities::Extensions

pub struct Extensions { /* private fields */ }

Stores extensions that should be made available through the externalities.

Implementations

impl Extensions

pub fn new() -> Self

Create new instance of Self.

pub fn register<E: Extension>(&mut self, ext: E)

Register the given extension.

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

Register extension extension using the given type_id.

pub fn get_mut(&mut self, ext_type_id: TypeId) -> Option<&mut dyn Any>

Return a mutable reference to the requested extension.

pub fn deregister(&mut self, type_id: TypeId) -> bool

Deregister extension for the given type_id.

Returns true when the extension was registered.

pub fn iter_mut( &mut self ) -> impl Iterator<Item = (&TypeId, &mut Box<dyn Extension>)>

Returns a mutable iterator over all extensions.

pub fn merge(&mut self, other: Self)

Merge other into self.

If both contain the same extension, the extension instance of other will overwrite the instance found in self.

Trait Implementations

impl Debug for Extensions

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Extensions

fn default() -> Extensions

Returns the “default value” for a type.

impl Extend<Extensions> for Extensions

fn extend<T: IntoIterator<Item = Extensions>>(&mut self, iter: T)

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.