Struct actix_web_lab::extract::LazyData

pub struct LazyData<T> { /* private fields */ }

A lazy extractor for thread-local data.

Using LazyData as an extractor will not initialize the data; get must be used.

Implementations

impl<T> LazyData<T>

pub fn new<F, Fut>(init: F) -> LazyData<T>where
    F: FnOnce() -> Fut,
    Fut: Future<Output = T> + 'static,

Constructs a new LazyData extractor with the given initialization function.

Initialization functions must return a future that resolves to T.

pub async fn get(&self) -> &T

Returns reference to result of lazy T value, initializing if necessary.

Trait Implementations

impl<T> Clone for LazyData<T>

fn clone(&self) -> Self

Returns a copy of the value.

const fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for LazyData<T>

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

Formats the value using the given formatter.

impl<T: 'static> FromRequest for LazyData<T>

type Error = Error

The associated error which can be returned.

type Future = Ready<Result<LazyData<T>, Error>>

Future that resolves to a Self.

fn from_request(req: &HttpRequest, _: &mut Payload) -> Self::Future

Create a Self from request parts asynchronously.

fn extract(req: &HttpRequest) -> Self::Future

Create a Self from request head asynchronously.