Struct OptionLayer 

pub struct OptionLayer<L> { /* private fields */ }

Available on crate feature util only.

A Layer that optionally applies an inner layer L.

This is the layer produced by option_layer. When the inner layer is present, the resulting service is the layered service; when it is absent, the resulting service is the unmodified service.

Unlike branching with Either directly, OptionLayer unifies the error types of the two branches to BoxError. This means the optional layer is allowed to change the error type (as TimeoutLayer does, for example) without the two branches needing to share an error type.

Implementations

impl<L> OptionLayer<L>

pub const fn new(layer: Option<L>) -> Self

Create a new OptionLayer wrapping the given optional layer.

Trait Implementations

impl<L: Clone> Clone for OptionLayer<L>

fn clone(&self) -> OptionLayer<L>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<L: Copy> Copy for OptionLayer<L>

impl<L: Debug> Debug for OptionLayer<L>

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

Formats the value using the given formatter.

impl<L> From<Option<L>> for OptionLayer<L>

fn from(layer: Option<L>) -> Self

Converts to this type from the input type.

impl<S, L> Layer<S> for OptionLayer<L>

where L: Layer<S>,

type Service = OptionService<<L as Layer<S>>::Service, S>

The wrapped service

fn layer(&self, inner: S) -> Self::Service

Wrap the given service with the middleware, returning a new service that has been decorated with the middleware.