Struct Extensions 

pub struct Extensions { /* private fields */ }

A type that can be used to dynamically store data by type.

Examples

use extendable::Extensions;

let mut extensions = Extensions::default();

// Insert an extension with type `u32`.
extensions.insert::<u32>(42);

// Get a reference to the extension with type `u32` and asset its equal to 42.
assert_eq!(extensions.get::<u32>(), Some(&42));

Implementations

impl Extensions

pub fn get<T: Any>(&self) -> Option<&T>

Gets a reference to the extension with type T.

pub fn get_mut<T: Any>(&mut self) -> Option<&mut T>

Gets a mutable reference to the extension with type T.

pub fn insert<T: Any>(&mut self, value: T)

Inserts an extension with type T.

pub fn remove<T: Any>(&mut self) -> Option<T>

Removes an extension with type T.

pub fn clear(&mut self)

Removes all extensions.

pub fn contains<T: Any>(&self) -> bool

Returns true if the map contains an extension with type T.

pub fn is_empty(&self) -> bool

Returns true if the map is empty.

pub fn len(&self) -> usize

Returns the number of extensions.

Trait Implementations

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.