Struct evento::Context

pub struct Context { /* private fields */ }

A type map for request extensions.

All entries into this map must be owned types (or static references).

Implementations

impl Context

pub fn new() -> Context

Creates an empty Context.

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

Insert an item into the map.

If an item of this type was already stored, it will be replaced and returned.

let mut map = Context::new();
assert_eq!(map.insert(""), None);
assert_eq!(map.insert(1u32), None);
assert_eq!(map.insert(2u32), Some(1u32));
assert_eq!(*map.get::<u32>().unwrap(), 2u32);

pub fn contains<T: 'static>(&self) -> bool

Check if map contains an item of a given type.

let mut map = Context::new();
assert!(!map.contains::<u32>());

assert_eq!(map.insert(1u32), None);
assert!(map.contains::<u32>());

pub fn extract<T: 'static>(&self) -> &T

Get a reference to an item of a given type.

let mut map = Context::new();
map.insert(1u32);
assert_eq!(map.get::<u32>(), Some(&1u32));

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

Get a reference to an item of a given type.

let mut map = Context::new();
map.insert(1u32);
assert_eq!(map.get::<u32>(), Some(&1u32));

pub fn get_mut<T: 'static>(&mut self) -> Option<&mut T>

Get a mutable reference to an item of a given type.

let mut map = Context::new();
map.insert(1u32);
assert_eq!(map.get_mut::<u32>(), Some(&mut 1u32));

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

Remove an item from the map of a given type.

If an item of this type was already stored, it will be returned.

let mut map = Context::new();

map.insert(1u32);
assert_eq!(map.get::<u32>(), Some(&1u32));

assert_eq!(map.remove::<u32>(), Some(1u32));
assert!(!map.contains::<u32>());

pub fn clear(&mut self)

Clear the Context of all inserted extensions.

let mut map = Context::new();

map.insert(1u32);
assert!(map.contains::<u32>());

map.clear();
assert!(!map.contains::<u32>());

pub fn extend(&mut self, other: Context)

Extends self with the items from another Context.

Trait Implementations

impl Debug for Context

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

Formats the value using the given formatter.

impl Default for Context

fn default() -> Context

Returns the “default value” for a type.