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
sourceimpl TypeId
impl TypeId
const: unstable · sourcepub fn of<T>() -> TypeId where
T: 'static + ?Sized,
pub fn of<T>() -> TypeId where
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
sourceimpl Ord for TypeId
impl Ord for TypeId
sourceimpl PartialOrd<TypeId> for TypeId
impl PartialOrd<TypeId> for TypeId
sourcefn partial_cmp(&self, other: &TypeId) -> Option<Ordering>
fn partial_cmp(&self, other: &TypeId) -> Option<Ordering>
This method returns an ordering between self
and other
values if one exists. Read more
sourcefn lt(&self, other: &Rhs) -> bool
fn lt(&self, other: &Rhs) -> bool
This method tests less than (for self
and other
) and is used by the <
operator. Read more
sourcefn 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 more
impl Copy for TypeId
impl Eq for TypeId
impl StructuralEq for TypeId
impl StructuralPartialEq 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
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
Uses borrowed data to replace owned data, usually by cloning. Read more