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>() -> TypeIdwhere
T: 'static + ?Sized,
pub fn of<T>() -> TypeIdwhere
T: 'static + ?Sized,
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);
RunTrait Implementations§
source§impl Ord for TypeId
impl Ord for TypeId
source§impl PartialOrd for TypeId
impl PartialOrd for TypeId
impl Copy for TypeId
impl Eq for TypeId
Auto Trait Implementations§
impl RefUnwindSafe for TypeId
impl Send for TypeId
impl Sync for TypeId
impl Unpin for TypeId
impl UnwindSafe for TypeId
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more