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!
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);
}Run
Performs copy-assignment from source. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=.
This method returns an ordering between self and other values if one exists. Read more
This method tests less than (for self and other) and is used by the < operator. Read more
This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
This method tests greater than (for self and other) and is used by the > operator. Read more
This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
This method returns an Ordering between self and other. Read more
Compares and returns the maximum of two values. Read more
Compares and returns the minimum of two values. Read more
Formats the value using the given formatter. Read more
Feeds this value into the given [Hasher]. Read more
Feeds a slice of this type into the given [Hasher]. Read more