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 outside of your code!
impl TypeId
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fn of<T>() -> TypeId where
T: 'static + ?Sized,
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Returns the TypeId of the type this generic function has been instantiated with.
use std::any::{Any, TypeId};
fn is_string<T: ?Sized + Any>(_s: &T) -> bool {
TypeId::of::<String>() == TypeId::of::<T>()
}
fn main() {
assert_eq!(is_string(&0), false);
assert_eq!(is_string(&"cookie monster".to_string()), true);
} impl Clone for TypeId
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fn clone(&self) -> TypeId
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source. Read more
impl PartialOrd<TypeId> for TypeId
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fn partial_cmp(&self, __arg_0: &TypeId) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, __arg_0: &TypeId) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, __arg_0: &TypeId) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, __arg_0: &TypeId) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, __arg_0: &TypeId) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl Eq for TypeId
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impl Hash for TypeId
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fn hash<__H>(&self, __arg_0: &mut __H) where
__H: Hasher,
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Feeds this value into the given [Hasher]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
Feeds a slice of this type into the given [Hasher]. Read more
impl Copy for TypeId
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impl Ord for TypeId
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fn cmp(&self, __arg_0: &TypeId) -> Ordering
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This method returns an Ordering between self and other. Read more
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
impl PartialEq<TypeId> for TypeId
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fn eq(&self, __arg_0: &TypeId) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, __arg_0: &TypeId) -> bool
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This method tests for !=.
impl Debug for TypeId
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fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>
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Formats the value using the given formatter. Read more
© 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