1.0.0[][src]Struct std::any::TypeId

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.

While TypeId implements Hash, PartialOrd, and Ord, it is worth noting that the hashes and ordering will vary between Rust releases. Beware of relying on them inside of your code!

Methods

impl TypeId[src]

pub fn of<T>() -> TypeId where
    T: 'static + ?Sized
[src]

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

Examples

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_string()), true);
}Run

Trait Implementations

impl Hash for TypeId[src]

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher
1.3.0
[src]

Feeds a slice of this type into the given [Hasher]. Read more

impl Debug for TypeId[src]

impl Ord for TypeId[src]

fn max(self, other: Self) -> Self
1.21.0
[src]

Compares and returns the maximum of two values. Read more

fn min(self, other: Self) -> Self
1.21.0
[src]

Compares and returns the minimum of two values. Read more

fn clamp(self, min: Self, max: Self) -> Self[src]

🔬 This is a nightly-only experimental API. (clamp #44095)

Restrict a value to a certain interval. Read more

impl Eq for TypeId[src]

impl PartialEq<TypeId> for TypeId[src]

impl Copy for TypeId[src]

impl Clone for TypeId[src]

fn clone_from(&mut self, source: &Self)[src]

Performs copy-assignment from source. Read more

impl PartialOrd<TypeId> for TypeId[src]

Auto Trait Implementations

impl Send for TypeId

impl Sync for TypeId

Blanket Implementations

impl<T> From for T[src]

impl<T, U> TryFrom for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T, U> Into for T where
    U: From<T>, 
[src]

impl<T> Borrow for T where
    T: ?Sized
[src]

impl<T> BorrowMut for T where
    T: ?Sized
[src]

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T