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!
Implementations
impl 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
impl Clone for TypeId
pub fn clone(&self) -> TypeId
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl Debug for TypeId
pub fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
Formats the value using the given formatter. Read more
impl Hash for TypeId
impl Ord for TypeId
pub fn cmp(&self, other: &TypeId) -> Ordering
fn max(self, other: Self) -> Self
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self
Compares and returns the minimum of two values. Read more
fn clamp(self, min: Self, max: Self) -> Self
Restrict a value to a certain interval. Read more
impl PartialEq<TypeId> for TypeId
pub fn eq(&self, other: &TypeId) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
pub fn ne(&self, other: &TypeId) -> bool
This method tests for !=
.
impl PartialOrd<TypeId> for TypeId
pub fn partial_cmp(&self, other: &TypeId) -> Option<Ordering>
This method returns an ordering between self
and other
values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
This method tests less than (for self
and other
) and is used by the <
operator. Read more
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
fn gt(&self, other: &Rhs) -> bool
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
fn ge(&self, other: &Rhs) -> bool
This method tests greater 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
impl<T> From<T> for T
pub fn from(t: T) -> T
Performs the conversion.
pub fn into(self) -> U
Performs the conversion.
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
Creates owned data from borrowed data, usually by cloning. Read more
pub fn clone_into(&self, target: &mut T)
toowned_clone_into
#41263)recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
Performs the conversion.
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
Performs the conversion.
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/any/struct.TypeId.html