Struct Extensions 

pub struct Extensions { /* private fields */ }

A minimal type-map for passing data through middleware.

Uses Arc<dyn Any> internally so Clone is cheap, which is needed for batch requests that create multiple RouterRequests from the same HTTP request.

Example

use tower_mcp::Extensions;

let mut ext = Extensions::new();
ext.insert(42u32);
assert_eq!(ext.get::<u32>(), Some(&42));

Implementations

impl Extensions

pub fn new() -> Self

Create an empty extensions map.

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

Insert a value into the extensions map.

If a value of the same type already exists, it is replaced.

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

Get a reference to a value in the extensions map.

Returns None if no value of the given type has been inserted.

Trait Implementations

impl Clone for Extensions

fn clone(&self) -> Extensions

Returns a duplicate of the value.

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

Performs copy-assignment from source.

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.