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
1.0.0 (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);RunTrait Implementations§
1.0.0 · source§impl Ord for TypeId
impl Ord for TypeId
1.0.0 · source§impl PartialEq for TypeId
impl PartialEq for TypeId
1.0.0 · source§impl PartialOrd for TypeId
impl PartialOrd for TypeId
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for
self and other) and is used by the <=
operator. Read moreimpl Copy for TypeId
impl Eq for TypeId
Auto Trait Implementations§
impl Freeze for TypeId
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