Struct arc_swap::access::Map

pub struct Map<A, T, F> { /* private fields */ }

An adaptor to provide access to a part of larger structure.

This is the active part of this module. Use the module documentation for the details.

Implementations

impl<A, T, F> Map<A, T, F>

pub fn new<R>(access: A, projection: F) -> Self

where F: Fn(&T) -> &R + Clone,

Creates a new instance.

Parameters

• access: Access to the bigger structure. This is usually something like Arc<ArcSwap> or &ArcSwap. It is technically possible to use any other Access here, though, for example to sub-delegate into even smaller structure from a Map (or generic Access).
• projection: A function (or closure) responsible to providing a reference into the bigger bigger structure, selecting just subset of it. In general, it is expected to be cheap (like only taking reference).

Trait Implementations

impl<A, F, T, R> Access<R> for Map<A, T, F>

where A: Access<T>, F: Fn(&T) -> &R + Clone,

type Guard = MapGuard<<A as Access<T>>::Guard, F, T, R>

A guard object containing the value and keeping it alive.

fn load(&self) -> Self::Guard

The loading method.

impl<A: Clone, T: Clone, F: Clone> Clone for Map<A, T, F>

fn clone(&self) -> Map<A, T, F>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<A: Debug, T: Debug, F: Debug> Debug for Map<A, T, F>

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

Formats the value using the given formatter.

impl<A: Copy, T: Copy, F: Copy> Copy for Map<A, T, F>