1.0.0[−][src]Trait nom::lib::std::convert::AsRef

[+] Show declaration

pub trait AsRef<T> where
    T: ?Sized, {
    fn as_ref(&self) -> &TⓘNotable traits for &'_ mut I
impl<'_, I> Iterator for &'_ mut I where
    I: Iterator + ?Sized,     type Item = <I as Iterator>::Item;;
}

[−]

Used to do a cheap reference-to-reference conversion.

This trait is similar to AsMut which is used for converting between mutable references. If you need to do a costly conversion it is better to implement From with type &T or write a custom function.

AsRef has the same signature as Borrow, but Borrow is different in few aspects:

Unlike AsRef, Borrow has a blanket impl for any T, and can be used to accept either a reference or a value.
Borrow also requires that Hash, Eq and Ord for borrowed value are equivalent to those of the owned value. For this reason, if you want to borrow only a single field of a struct you can implement AsRef, but not Borrow.

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

By using trait bounds we can accept arguments of different types as long as they can be converted to the specified type T.

For example: By creating a generic function that takes an AsRef<str> we express that we want to accept all references that can be converted to [&str] as an argument. Since both String and [&str] implement AsRef<str> we can accept both as input argument.

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

`fn as_ref(&self) -> &TⓘNotable traits for &'_ mut I impl<'_, I> Iterator for &'_ mut I where I: Iterator + ?Sized, type Item = ::Item;`[−]

Performs the conversion.

1.0.0[−][src]Trait nom::lib::std::convert::AsRef

Notable traits for &'_ mut I

Generic Implementations

Examples

Required methods

fn as_ref(&self) -> &TⓘNotable traits for &'_ mut Iimpl<'_, I> Iterator for &'_ mut I where I: Iterator + ?Sized, type Item = <I as Iterator>::Item;[−]

Notable traits for &'_ mut I

Implementations on Foreign Types

impl AsRef<Path> for OsStr[src][−]

fn as_ref(&self) -> &Path[src]

impl AsRef<Path> for str[src][−]

fn as_ref(&self) -> &Path[src]

impl<'_> AsRef<OsStr> for Components<'_>[src][−]

fn as_ref(&self) -> &OsStr[src]

impl AsRef<OsStr> for str[src][−]

fn as_ref(&self) -> &OsStr[src]

impl AsRef<Path> for Path[src][−]

fn as_ref(&self) -> &Path[src]

impl<'_> AsRef<OsStr> for Component<'_>[src][−]

fn as_ref(&self) -> &OsStr[src]

impl AsRef<OsStr> for OsStr[src][−]

fn as_ref(&self) -> &OsStr[src]

impl<'_> AsRef<Path> for Component<'_>[src][−]

fn as_ref(&self) -> &Path[src]

impl AsRef<OsStr> for PathBuf[src][−]

fn as_ref(&self) -> &OsStr[src]

impl AsRef<CStr> for CStr[src][−]

fn as_ref(&self) -> &CStr[src]

impl<'_> AsRef<Path> for Iter<'_>[src][−]

fn as_ref(&self) -> &Path[src]

impl AsRef<OsStr> for Path[src][−]

fn as_ref(&self) -> &OsStr[src]

impl AsRef<OsStr> for OsString[src][−]

fn as_ref(&self) -> &OsStr[src]

impl<'_> AsRef<Path> for Components<'_>[src][−]

fn as_ref(&self) -> &Path[src]

impl AsRef<Path> for OsString[src][−]

fn as_ref(&self) -> &Path[src]

impl AsRef<Path> for PathBuf[src][−]

fn as_ref(&self) -> &Path[src]

impl AsRef<CStr> for CString[src][−]

fn as_ref(&self) -> &CStr[src]

impl<'_> AsRef<OsStr> for Iter<'_>[src][−]

fn as_ref(&self) -> &OsStr[src]

impl<'_, T, U> AsRef<U> for &'_ T where T: AsRef<U> + ?Sized, U: ?Sized, [src][−]

fn as_ref(&self) -> &UⓘNotable traits for &'_ mut Iimpl<'_, I> Iterator for &'_ mut I where I: Iterator + ?Sized, type Item = <I as Iterator>::Item;[src]

Notable traits for &'_ mut I

impl AsRef<[u8]> for str[src][−]

fn as_ref(&self) -> &[u8]ⓘNotable traits for &'_ mut [u8]impl<'_> Write for &'_ mut [u8]impl<'_> Read for &'_ [u8][src]

Notable traits for &'_ mut [u8]

impl<T> AsRef<[T]> for [T][src][−]

fn as_ref(&self) -> &[T]ⓘNotable traits for &'_ mut [u8]impl<'_> Write for &'_ mut [u8]impl<'_> Read for &'_ [u8][src]

Notable traits for &'_ mut [u8]

impl<'_, T, U> AsRef<U> for &'_ mut T where T: AsRef<U> + ?Sized, U: ?Sized, [src][−]

fn as_ref(&self) -> &UⓘNotable traits for &'_ mut Iimpl<'_, I> Iterator for &'_ mut I where I: Iterator + ?Sized, type Item = <I as Iterator>::Item;[src]

Notable traits for &'_ mut I

impl AsRef<str> for str[src][−]

fn as_ref(&self) -> &str[src]

impl<T, const N: usize> AsRef<[T]> for [T; N][src][−]

fn as_ref(&self) -> &[T]ⓘNotable traits for &'_ mut [u8]impl<'_> Write for &'_ mut [u8]impl<'_> Read for &'_ [u8][src]

Notable traits for &'_ mut [u8]

impl<T> AsRef<T> for Rc<T> where T: ?Sized, [src][−]

fn as_ref(&self) -> &TⓘNotable traits for &'_ mut Iimpl<'_, I> Iterator for &'_ mut I where I: Iterator + ?Sized, type Item = <I as Iterator>::Item;[src]

Notable traits for &'_ mut I

impl<T> AsRef<T> for Arc<T> where T: ?Sized, [src][−]

fn as_ref(&self) -> &TⓘNotable traits for &'_ mut Iimpl<'_, I> Iterator for &'_ mut I where I: Iterator + ?Sized, type Item = <I as Iterator>::Item;[src]

Notable traits for &'_ mut I

Implementors

impl AsRef<[u8]> for String[src][+]

fn as_ref(&self) -> &[u8]ⓘNotable traits for &'_ mut [u8]impl<'_> Write for &'_ mut [u8]impl<'_> Read for &'_ [u8][src]

Notable traits for &'_ mut [u8]

impl AsRef<str> for String[src][+]

fn as_ref(&self) -> &str[src]

impl AsRef<OsStr> for String[src][+]

fn as_ref(&self) -> &OsStr[src]

impl AsRef<Path> for String[src][+]

fn as_ref(&self) -> &Path[src]

impl<'_> AsRef<Path> for Cow<'_, OsStr>[src][+]

fn as_ref(&self) -> &Path[src]

impl<'_, T> AsRef<[T]> for nom::lib::std::slice::Iter<'_, T>[src][+]

`fn as_ref(&self) -> &TⓘNotable traits for &'_ mut I impl<'_, I> Iterator for &'_ mut I where I: Iterator + ?Sized, type Item = <I as Iterator>::Item;`[−]

`impl AsRef<Path> for OsStr`[src][−]

`fn as_ref(&self) -> &Path`[src]

`impl AsRef<Path> for str`[src][−]

`fn as_ref(&self) -> &Path`[src]

`impl<'_> AsRef<OsStr> for Components<'_>`[src][−]

`fn as_ref(&self) -> &OsStr`[src]

`impl AsRef<OsStr> for str`[src][−]

`fn as_ref(&self) -> &OsStr`[src]

`impl AsRef<Path> for Path`[src][−]

`fn as_ref(&self) -> &Path`[src]

`impl<'_> AsRef<OsStr> for Component<'_>`[src][−]

`fn as_ref(&self) -> &OsStr`[src]

`impl AsRef<OsStr> for OsStr`[src][−]

`fn as_ref(&self) -> &OsStr`[src]

`impl<'_> AsRef<Path> for Component<'_>`[src][−]

`fn as_ref(&self) -> &Path`[src]

`impl AsRef<OsStr> for PathBuf`[src][−]

`fn as_ref(&self) -> &OsStr`[src]

`impl AsRef<CStr> for CStr`[src][−]

`fn as_ref(&self) -> &CStr`[src]

`impl<'_> AsRef<Path> for Iter<'_>`[src][−]

`fn as_ref(&self) -> &Path`[src]

`impl AsRef<OsStr> for Path`[src][−]

`fn as_ref(&self) -> &OsStr`[src]

`impl AsRef<OsStr> for OsString`[src][−]

`fn as_ref(&self) -> &OsStr`[src]

`impl<'_> AsRef<Path> for Components<'_>`[src][−]

`fn as_ref(&self) -> &Path`[src]

`impl AsRef<Path> for OsString`[src][−]

`fn as_ref(&self) -> &Path`[src]

`impl AsRef<Path> for PathBuf`[src][−]

`fn as_ref(&self) -> &Path`[src]

`impl AsRef<CStr> for CString`[src][−]

`fn as_ref(&self) -> &CStr`[src]

`impl<'_> AsRef<OsStr> for Iter<'_>`[src][−]

`fn as_ref(&self) -> &OsStr`[src]

`impl<'_, T, U> AsRef<U> for &'_ T where T: AsRef<U> + ?Sized, U: ?Sized,` [src][−]

`fn as_ref(&self) -> &UⓘNotable traits for &'_ mut I impl<'_, I> Iterator for &'_ mut I where I: Iterator + ?Sized, type Item = <I as Iterator>::Item;`[src]

`impl AsRef<[u8]> for str`[src][−]

`fn as_ref(&self) -> &[u8]ⓘNotable traits for &'_ mut [u8] impl<'_> Write for &'_ mut [u8]impl<'_> Read for &'_ [u8]`[src]

Notable traits for &'_ mut [u8 ]

`impl<T> AsRef<[T]> for [T]`[src][−]

`fn as_ref(&self) -> &[T]ⓘNotable traits for &'_ mut [u8] impl<'_> Write for &'_ mut [u8]impl<'_> Read for &'_ [u8]`[src]

Notable traits for &'_ mut [u8 ]

`impl<'_, T, U> AsRef<U> for &'_ mut T where T: AsRef<U> + ?Sized, U: ?Sized,` [src][−]

`fn as_ref(&self) -> &UⓘNotable traits for &'_ mut I impl<'_, I> Iterator for &'_ mut I where I: Iterator + ?Sized, type Item = <I as Iterator>::Item;`[src]

`impl AsRef<str> for str`[src][−]

`fn as_ref(&self) -> &str`[src]

`impl<T, const N: usize> AsRef<[T]> for [T; N]`[src][−]

`fn as_ref(&self) -> &[T]ⓘNotable traits for &'_ mut [u8] impl<'_> Write for &'_ mut [u8]impl<'_> Read for &'_ [u8]`[src]

Notable traits for &'_ mut [u8 ]

`impl<T> AsRef<T> for Rc<T> where T: ?Sized,` [src][−]

`fn as_ref(&self) -> &TⓘNotable traits for &'_ mut I impl<'_, I> Iterator for &'_ mut I where I: Iterator + ?Sized, type Item = <I as Iterator>::Item;`[src]

`impl<T> AsRef<T> for Arc<T> where T: ?Sized,` [src][−]

`fn as_ref(&self) -> &TⓘNotable traits for &'_ mut I impl<'_, I> Iterator for &'_ mut I where I: Iterator + ?Sized, type Item = <I as Iterator>::Item;`[src]

`impl AsRef<[u8]> for String`[src][+]

`fn as_ref(&self) -> &[u8]ⓘNotable traits for &'_ mut [u8] impl<'_> Write for &'_ mut [u8]impl<'_> Read for &'_ [u8]`[src]

Notable traits for &'_ mut [u8 ]

`impl AsRef<str> for String`[src][+]

`fn as_ref(&self) -> &str`[src]

`impl AsRef<OsStr> for String`[src][+]

`fn as_ref(&self) -> &OsStr`[src]

`impl AsRef<Path> for String`[src][+]

`fn as_ref(&self) -> &Path`[src]

`impl<'_> AsRef<Path> for Cow<'_, OsStr>`[src][+]

`fn as_ref(&self) -> &Path`[src]

`impl<'_, T> AsRef<[T]> for nom::lib::std::slice::Iter<'_, T>`[src][+]

`fn as_ref(&self) -> &[T]ⓘNotable traits for &'_ mut [u8] impl<'_> Write for &'_ mut [u8]impl<'_> Read for &'_ [u8]`[src]

Notable traits for &'_ mut [u8 ]

`impl<'_, T> AsRef<T> for Cow<'_, T> where T: ToOwned + ?Sized,` [src][+]

`fn as_ref(&self) -> &TⓘNotable traits for &'_ mut I impl<'_, I> Iterator for &'_ mut I where I: Iterator + ?Sized, type Item = <I as Iterator>::Item;`[src]

`impl<'a, T> AsRef<[T]> for Drain<'a, T>`[src][+]

`fn as_ref(&self) -> &[T]ⓘNotable traits for &'_ mut [u8] impl<'_> Write for &'_ mut [u8]impl<'_> Read for &'_ [u8]`[src]

Notable traits for &'_ mut [u8 ]

`impl<T> AsRef<[T]> for Vec<T>`[src][+]

`fn as_ref(&self) -> &[T]ⓘNotable traits for &'_ mut [u8] impl<'_> Write for &'_ mut [u8]impl<'_> Read for &'_ [u8]`[src]

Notable traits for &'_ mut [u8 ]

`impl<T> AsRef<[T]> for IntoIter<T>`[src][+]

`fn as_ref(&self) -> &[T]ⓘNotable traits for &'_ mut [u8] impl<'_> Write for &'_ mut [u8]impl<'_> Read for &'_ [u8]`[src]