Struct std::any::TypeId1.0.0 [] [src]

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.

Methods

impl TypeId
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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>()
}

fn main() {
    assert_eq!(is_string(&0), false);
    assert_eq!(is_string(&"cookie monster".to_owned()), true);
}Run

Trait Implementations

impl Copy for TypeId
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impl Debug for TypeId
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Formats the value using the given formatter.

impl PartialEq<TypeId> for TypeId
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This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

impl Clone for TypeId
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Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl Hash for TypeId
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Feeds this value into the state given, updating the hasher as necessary.

Feeds a slice of this type into the state provided.

impl Eq for TypeId
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