pub struct TypeId { /* private fields */ }Expand description
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!
Implementations§
source§impl TypeId
 
impl TypeId
const: unstable · sourcepub fn of<T: ?Sized + 'static>() -> TypeId
 
pub fn of<T: ?Sized + 'static>() -> TypeId
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>()
}
assert_eq!(is_string(&0), false);
assert_eq!(is_string(&"cookie monster".to_string()), true);Trait Implementations§
source§impl Ord for TypeId
 
impl Ord for TypeId
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
    Self: Sized,
 
fn max(self, other: Self) -> Selfwhere Self: Sized,
Compares and returns the maximum of two values. Read more