Struct std::any::TypeId1.0.0 [] [src]

pub struct TypeId { /* fields omitted */ }

A TypeId represents a globally unique identifier for a type.

Each TypeId is an opaque object which does not allow inspection of what's inside but does allow basic operations such as cloning, comparison, printing, and showing.

A TypeId is currently only available for types which ascribe to 'static, but this limitation may be removed in the future.


impl TypeId

Returns the TypeId of the type this generic function has been instantiated with.


use std::any::{Any, TypeId};

fn is_string<T: ?Sized + Any>(_s: &T) -> bool {
    TypeId::of::<String>() == TypeId::of::<T>()

fn main() {
    assert_eq!(is_string(&0), false);
    assert_eq!(is_string(&"cookie monster".to_owned()), true);

Trait Implementations

impl Copy for TypeId

impl Debug for TypeId

Formats the value using the given formatter.

impl PartialEq<TypeId> for TypeId

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

impl Clone for TypeId

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl Hash for TypeId

Feeds this value into the state given, updating the hasher as necessary.

Feeds a slice of this type into the state provided.

impl Eq for TypeId