Struct ExtensionsRef

pub struct ExtensionsRef<'a>(pub &'a Extensions);

Extract immutable reference of the Extensions.

Tuple Fields

0: &'a Extensions

Methods from Deref<Target = Extensions>

pub fn get<T>(&self) -> Option<&T>

where T: Send + Sync + 'static,

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

Example

let mut ext = Extensions::new();
assert!(ext.get::<i32>().is_none());
ext.insert(5i32);

assert_eq!(ext.get::<i32>(), Some(&5i32));

pub fn is_empty(&self) -> bool

Check whether the extension set is empty or not.

Example

let mut ext = Extensions::new();
assert!(ext.is_empty());
ext.insert(5i32);
assert!(!ext.is_empty());

pub fn len(&self) -> usize

Get the number of extensions available.

Example

let mut ext = Extensions::new();
assert_eq!(ext.len(), 0);
ext.insert(5i32);
assert_eq!(ext.len(), 1);

Trait Implementations

impl Deref for ExtensionsRef<'_>

type Target = Extensions

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'a, 'r, C, B> FromRequest<'a, WebContext<'r, C, B>> for ExtensionsRef<'a>

type Type<'b> = ExtensionsRef<'b>

type Error = Error

async fn from_request( ctx: &'a WebContext<'r, C, B>, ) -> Result<Self, Self::Error>