Struct Extensions 

pub struct Extensions { /* private fields */ }

A type map of protocol extensions.

Extensions can be used by Request and Response to store extra data derived from the underlying protocol.

Implementations

impl Extensions

pub fn insert<T: Send + Sync + 'static>(&mut self, val: T) -> Option<T>

Insert a type into this Extensions.

If a extension of this type already existed, it will be returned.

pub fn get<T: Send + Sync + 'static>(&self) -> Option<&T>

Get a reference to a type previously inserted on this Extensions.

pub fn get_mut<T: Send + Sync + 'static>(&mut self) -> Option<&mut T>

Get a mutable reference to a type previously inserted on this Extensions.

pub fn get_or_default_mut<T: Default + Send + Sync + 'static>( &mut self, ) -> &mut T

Get a mutable reference to a type or insert and return the value if it does not exist

pub fn contains_key<T: Send + Sync + 'static>(&self) -> bool

Returns true type has been stored in Extensions.

pub fn remove<T: Send + Sync + 'static>(&mut self) -> Option<T>

Remove a type from this Extensions.

If a extension of this type existed, it will be returned.

pub fn clear(&mut self)

Clear the Extensions of all inserted extensions.

pub fn is_empty(&self) -> bool

Check whether the extension set is empty or not.

pub fn len(&self) -> usize

Get the number of extensions available.

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.