Trait core::convert::AsRef 1.0.0
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[src]
pub trait AsRef<T: ?Sized> {
fn as_ref(&self) -> &T;
}A cheap, reference-to-reference conversion.
AsRef is very similar to, but different than, Borrow. See
the book for more.
Note: this trait must not fail. If the conversion can fail, use a dedicated method which
returns an Option<T> or a Result<T, E>.
Examples
Both String and &str implement AsRef<str>:
fn is_hello<T: AsRef<str>>(s: T) { assert_eq!("hello", s.as_ref()); } let s = "hello"; is_hello(s); let s = "hello".to_string(); is_hello(s);Run
Generic Impls
AsRefauto-dereferences if the inner type is a reference or a mutable reference (e.g.:foo.as_ref()will work the same iffoohas type&mut Fooor&&mut Foo)
Required Methods
fn as_ref(&self) -> &T
Performs the conversion.
Implementors
impl<'a, T: ?Sized, U: ?Sized> AsRef<U> for &'a T where T: AsRef<U>impl<'a, T: ?Sized, U: ?Sized> AsRef<U> for &'a mut T where T: AsRef<U>impl<T> AsRef<[T]> for [T]impl AsRef<str> for strimpl<T> AsRef<[T]> for [T; 0]impl<T> AsRef<[T]> for [T; 1]impl<T> AsRef<[T]> for [T; 2]impl<T> AsRef<[T]> for [T; 3]impl<T> AsRef<[T]> for [T; 4]impl<T> AsRef<[T]> for [T; 5]impl<T> AsRef<[T]> for [T; 6]impl<T> AsRef<[T]> for [T; 7]impl<T> AsRef<[T]> for [T; 8]impl<T> AsRef<[T]> for [T; 9]impl<T> AsRef<[T]> for [T; 10]impl<T> AsRef<[T]> for [T; 11]impl<T> AsRef<[T]> for [T; 12]impl<T> AsRef<[T]> for [T; 13]impl<T> AsRef<[T]> for [T; 14]impl<T> AsRef<[T]> for [T; 15]impl<T> AsRef<[T]> for [T; 16]impl<T> AsRef<[T]> for [T; 17]impl<T> AsRef<[T]> for [T; 18]impl<T> AsRef<[T]> for [T; 19]impl<T> AsRef<[T]> for [T; 20]impl<T> AsRef<[T]> for [T; 21]impl<T> AsRef<[T]> for [T; 22]impl<T> AsRef<[T]> for [T; 23]impl<T> AsRef<[T]> for [T; 24]impl<T> AsRef<[T]> for [T; 25]impl<T> AsRef<[T]> for [T; 26]impl<T> AsRef<[T]> for [T; 27]impl<T> AsRef<[T]> for [T; 28]impl<T> AsRef<[T]> for [T; 29]impl<T> AsRef<[T]> for [T; 30]impl<T> AsRef<[T]> for [T; 31]impl<T> AsRef<[T]> for [T; 32]impl<'a, T> AsRef<[T]> for Iter<'a, T>impl AsRef<[u8]> for str