Struct TypeMap 

pub struct TypeMap<T> { /* private fields */ }

Maps type identities to values of type T. Useful for registries and dispatch tables.

Example

use typex::TypeMap;

struct GetUser;
struct GetInvoice;

let mut routes = TypeMap::<&'static str>::new();
routes.insert::<GetUser>("/users/:id");
routes.insert::<GetInvoice>("/invoices/:id");

assert_eq!(routes.get::<GetUser>(), Some(&"/users/:id"));
assert_eq!(routes.get::<GetInvoice>(), Some(&"/invoices/:id"));
assert!(routes.contains::<GetInvoice>());
assert_eq!(routes.remove::<GetInvoice>(), Some("/invoices/:id"));
assert!(!routes.contains::<GetInvoice>());
assert_eq!(routes.len(), 1);

Implementation note: TypeMap is backed by a Vec, so it works under no_std. Scans are O(n), which is suitable for static type registries.

Implementations

impl<T> TypeMap<T>

pub fn new() -> Self

Creates an empty type map.

pub fn len(&self) -> usize

Returns the number of bound types.

pub fn is_empty(&self) -> bool

Checks whether no types are bound.

pub fn insert<U: 'static>(&mut self, value: T) -> Option<T>

Binds value to U, returning the previous value if the type was already bound.

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

Removes the value bound to U.

pub fn contains<U: 'static>(&self) -> bool

Checks whether a value is bound to U.

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

Returns the value bound to U.

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

Returns a mutable reference to the value bound to U.

pub fn type_names(&self) -> impl Iterator<Item = &'static str> + '_

Iterates over the bound Rust type names, in insertion order.

pub fn iter(&self) -> impl Iterator<Item = (&TypeInfo, &T)>

Iterates over the bound (TypeInfo, value) pairs, in insertion order.

Trait Implementations

impl<T: Clone> Clone for TypeMap<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for TypeMap<T>

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

Formats the value using the given formatter.

impl<T> Default for TypeMap<T>

fn default() -> Self

Returns the “default value” for a type.