Trait nom::lib::std::prelude::v1::v1::AsRef

pub trait AsRef<T> where
    T: ?Sized, {
    fn as_ref(&self) -> &T;
}

A cheap reference-to-reference conversion. Used to convert a value to a reference value within generic code.

AsRef is very similar to, but serves a slightly different purpose than, Borrow.

AsRef is to be used when wishing to convert to a reference of another type. Borrow is more related to the notion of taking the reference. It is useful when wishing to abstract over the type of reference (&T, &mut T) or allow both the referenced and owned type to be treated in the same manner.

The key difference between the two traits is the intention:

• Use AsRef when goal is to simply convert into a reference
• Use Borrow when goal is related to writing code that is agnostic to the type of borrow and if is reference or value

See the book for a more detailed comparison.

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>.

Generic Implementations

• AsRef auto-dereferences if the inner type is a reference or a mutable reference (e.g.: foo.as_ref() will work the same if foo has type &mut Foo or &&mut Foo)

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);

Required Methods

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

fn as_ref(&self) -> &T

Performs the conversion.

Implementations on Foreign Types

impl<'a> AsRef<Path> for Component<'a>

fn as_ref(&self) -> &Path

impl AsRef<Path> for OsString

fn as_ref(&self) -> &Path

impl AsRef<Path> for OsStr

fn as_ref(&self) -> &Path

impl AsRef<OsStr> for Path

fn as_ref(&self) -> &OsStr

impl<'a> AsRef<OsStr> for Component<'a>

fn as_ref(&self) -> &OsStr

impl AsRef<OsStr> for PathBuf

fn as_ref(&self) -> &OsStr

impl AsRef<Path> for Path

fn as_ref(&self) -> &Path

impl AsRef<Path> for str

fn as_ref(&self) -> &Path

impl AsRef<OsStr> for OsStr

fn as_ref(&self) -> &OsStr

impl<'a> AsRef<Path> for Cow<'a, OsStr>

fn as_ref(&self) -> &Path

impl<'a> AsRef<OsStr> for Components<'a>

fn as_ref(&self) -> &OsStr

impl AsRef<CStr> for CStr

fn as_ref(&self) -> &CStr

impl<'a> AsRef<Path> for Iter<'a>

fn as_ref(&self) -> &Path

impl<'a> AsRef<OsStr> for Iter<'a>

fn as_ref(&self) -> &OsStr

impl<'a> AsRef<Path> for Components<'a>

fn as_ref(&self) -> &Path

impl AsRef<CStr> for CString

fn as_ref(&self) -> &CStr

impl AsRef<OsStr> for str

fn as_ref(&self) -> &OsStr

impl AsRef<OsStr> for OsString

fn as_ref(&self) -> &OsStr

impl AsRef<Path> for PathBuf

fn as_ref(&self) -> &Path

impl<T> AsRef<[T]> for [T; 27]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 30]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<'a, T, U> AsRef<U> for &'a T where     T: AsRef<U> + ?Sized,     U: ?Sized,

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

fn as_ref(&self) -> &U

impl<T> AsRef<[T]> for [T; 17]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 21]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 25]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 19]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 12]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 11]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 16]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 3]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 0]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 29]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 9]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 26]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 2]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl AsRef<str> for str

fn as_ref(&self) -> &str

impl<T> AsRef<[T]> for [T; 20]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 13]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 23]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 14]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 10]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 32]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 22]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 5]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 15]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 28]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 8]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 7]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<'a, T, U> AsRef<U> for &'a mut T where     T: AsRef<U> + ?Sized,     U: ?Sized,

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

fn as_ref(&self) -> &U

impl AsRef<[u8]> for str

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[u8]

impl<T> AsRef<[T]> for [T; 24]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 1]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 31]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 6]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 18]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<[T]> for [T; 4]

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[T]

impl<T> AsRef<T> for Rc<T> where     T: ?Sized,

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

fn as_ref(&self) -> &T

impl<'a, T> AsRef<T> for Cow<'a, T> where     T: ToOwned + ?Sized,

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

fn as_ref(&self) -> &T

impl<T> AsRef<T> for Arc<T> where     T: ?Sized,

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

fn as_ref(&self) -> &T

impl AsRef<[u8]> for Literal

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn as_ref(&self) -> &[u8]

Implementors

• impl AsRef<OsStr> for String

• impl AsRef<Path> for String

• impl<'a, T> AsRef<[T]> for nom::lib::std::slice::Iter<'a, T>

• impl AsRef<[u8]> for String

• impl AsRef<str> for String

• impl<T> AsRef<Vec<T>> for Vec<T>

• impl<T> AsRef<T> for Box<T> where     T: ?Sized,

• impl<T> AsRef<[T]> for Vec<T>

• impl<'a> AsRef<str> for CompleteStr<'a>