Struct std::any::TypeId
pub struct TypeId { /* private fields */ }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 TypeIdpub 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);Trait Implementations
impl Clone for TypeIdfn 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 TypeIdfn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
Formats the value using the given formatter. Read more
impl Hash for TypeIdfn hash<H>(&self, state: &mut H)
where
H: Hasher,fn hash_slice<H>(data: &[Self], state: &mut H)
where
H: Hasher,
Self: Sized,impl Ord for TypeIdfn cmp(&self, other: &TypeId) -> Orderingfn max(self, other: Self) -> Self
where
Self: Sized,
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self
where
Self: Sized,
Compares and returns the minimum of two values. Read more
fn clamp(self, min: Self, max: Self) -> Self
where
Self: Sized + PartialOrd,
Restrict a value to a certain interval. Read more
impl PartialEq for TypeIdfn eq(&self, other: &TypeId) -> bool
This method tests for
self and other values to be equal, and is used by ==.
fn ne(&self, other: &Rhs) -> bool
This method tests for
!=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
impl PartialOrd for TypeIdfn partial_cmp(&self, other: &TypeId) -> Option<Ordering>fn lt(&self, other: &Rhs) -> boolfn 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) -> boolfn 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 TypeIdimpl Eq for TypeIdimpl StructuralEq for TypeIdAuto Trait Implementations
impl RefUnwindSafe for TypeIdimpl Send for TypeIdimpl Sync for TypeIdimpl Unpin for TypeIdimpl UnwindSafe for TypeIdBlanket Implementations
impl<T> Any for T
where
T: 'static + ?Sized,impl<T> Borrow<T> for T
where
T: ?Sized,impl<T> BorrowMut<T> for T
where
T: ?Sized,impl<T> From<T> for Tfn from(t: T) -> TReturns the argument unchanged.
impl<T, U> Into<U> for T
where
U: From<T>,fn into(self) -> UCalls U::from(self).
That is, this conversion is whatever the implementation of From<T> for U chooses to do.
impl<T> ToOwned for T
where
T: Clone,type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
Creates owned data from borrowed data, usually by cloning. Read more
fn clone_into(&self, target: &mut T)
Uses borrowed data to replace owned data, usually by cloning. Read more
impl<T, U> TryFrom<U> for T
where
U: Into<T>,type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
Performs the conversion.
impl<T, U> TryInto<U> for T
where
U: TryFrom<T>,type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
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