std::path::Prefix - Rust
Description: API documentation for the Rust `Prefix` enum in crate `std`.
Keywords: rust, rustlang, rust-lang, Prefix

# 1.0.0[−][src]Enum std::path::Prefix

    pub enum Prefix<'a> {
        Verbatim(&'a OsStr),
        VerbatimUNC(&'a OsStr, &'a OsStr),
        VerbatimDisk(u8),
        DeviceNS(&'a OsStr),
        UNC(&'a OsStr, &'a OsStr),
        Disk(u8),
    }

Windows path prefixes, e.g., `C:` or `\server\share`.

Windows uses a variety of path prefix styles, including references to drive volumes (like `C:`), network shared folders (like `\server\share`), and others. In addition, some path prefixes are "verbatim" (i.e., prefixed with `\?\`), in which case `/` is not treated as a separator and essentially no normalization is performed.

# Examples

    use std::path::{Component, Path, Prefix};
    use std::path::Prefix::*;
    use std::ffi::OsStr;

    fn get_path_prefix(s: &str) -> Prefix {
        let path = Path::new(s);
        match path.components().next().unwrap() {
            Component::Prefix(prefix_component) => prefix_component.kind(),
            _ => panic!(),
        }
    }

    assert_eq!(Verbatim(OsStr::new("pictures")),
               get_path_prefix(r"\\?\pictures\kittens"));
    assert_eq!(VerbatimUNC(OsStr::new("server"), OsStr::new("share")),
               get_path_prefix(r"\\?\UNC\server\share"));
    assert_eq!(VerbatimDisk(b'C'), get_path_prefix(r"\\?\c:\"));
    assert_eq!(DeviceNS(OsStr::new("BrainInterface")),
               get_path_prefix(r"\\.\BrainInterface"));
    assert_eq!(UNC(OsStr::new("server"), OsStr::new("share")),
               get_path_prefix(r"\\server\share"));
    assert_eq!(Disk(b'C'), get_path_prefix(r"C:\Users\Rust\Pictures\Ferris"));Run

## Variants

`Verbatim(&'a OsStr)`

Verbatim prefix, e.g., `\?\cat_pics`.

Verbatim prefixes consist of `\?\` immediately followed by the given component.

`VerbatimUNC(&'a OsStr, &'a OsStr)`

Verbatim prefix using Windows' Uniform Naming Convention, e.g., `\?\UNC\server\share`.

Verbatim UNC prefixes consist of `\?\UNC\` immediately followed by the server's hostname and a share name.

`VerbatimDisk(u8)`

Verbatim disk prefix, e.g., `\?\C:\`.

Verbatim disk prefixes consist of `\?\` immediately followed by the drive letter and `:\`.

`DeviceNS(&'a OsStr)`

Device namespace prefix, e.g., `\.\COM42`.

Device namespace prefixes consist of `\.\` immediately followed by the device name.

`UNC(&'a OsStr, &'a OsStr)`

Prefix using Windows' Uniform Naming Convention, e.g. `\server\share`.

UNC prefixes consist of the server's hostname and a share name.

`Disk(u8)`

Prefix `C:` for the given disk drive.

## Methods

### `impl<'a> Prefix<'a>`[src]

#### `pub fn is_verbatim(&self) -> bool`[src]

Determines if the prefix is verbatim, i.e., begins with `\?\`.

# Examples

    use std::path::Prefix::*;
    use std::ffi::OsStr;

    assert!(Verbatim(OsStr::new("pictures")).is_verbatim());
    assert!(VerbatimUNC(OsStr::new("server"), OsStr::new("share")).is_verbatim());
    assert!(VerbatimDisk(b'C').is_verbatim());
    assert!(!DeviceNS(OsStr::new("BrainInterface")).is_verbatim());
    assert!(!UNC(OsStr::new("server"), OsStr::new("share")).is_verbatim());
    assert!(!Disk(b'C').is_verbatim());Run

## Trait Implementations

### `impl<'a> PartialEq<Prefix<'a>> for Prefix<'a>`[src]

#### `fn eq(&self, other: &Prefix<'a>) -> bool`[src]

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Prefix<'a>) -> bool`[src]

This method tests for `!=`.

### `impl<'a> Eq for Prefix<'a>`[src]

### `impl<'a> Ord for Prefix<'a>`[src]

#### `fn cmp(&self, other: &Prefix<'a>) -> Ordering`[src]

This method returns an `Ordering` between `self` and `other`. Read more

#### `fn max(self, other: Self) -> Self`1.21.0[src]

Compares and returns the maximum of two values. Read more

#### `fn min(self, other: Self) -> Self`1.21.0[src]

Compares and returns the minimum of two values. Read more

#### `fn clamp(self, min: Self, max: Self) -> Self`[src]

🔬 This is a nightly-only experimental API. (`clamp` #44095)

Restrict a value to a certain interval. Read more

### `impl<'a> PartialOrd<Prefix<'a>> for Prefix<'a>`[src]

#### `fn partial_cmp(&self, other: &Prefix<'a>) -> Option<Ordering>`[src]

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Prefix<'a>) -> bool`[src]

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Prefix<'a>) -> bool`[src]

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Prefix<'a>) -> bool`[src]

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Prefix<'a>) -> bool`[src]

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl<'a> Debug for Prefix<'a>`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

Formats the value using the given formatter. Read more

### `impl<'a> Hash for Prefix<'a>`[src]

#### `fn hash<__H: Hasher>(&self, state: &mut __H)`[src]

Feeds this value into the given [`Hasher`]. Read more

#### `fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,` 1.3.0[src]

Feeds a slice of this type into the given [`Hasher`]. Read more

### `impl<'a> Copy for Prefix<'a>`[src]

### `impl<'a> Clone for Prefix<'a>`[src]

#### `fn clone(&self) -> Prefix<'a>`[src]

Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`[src]

Performs copy-assignment from `source`. Read more

## Auto Trait Implementations

### `impl<'a> Send for Prefix<'a>`

### `impl<'a> Sync for Prefix<'a>`

## Blanket Implementations

### `impl<T> From<T> for T`[src]

#### `fn from(t: T) -> T`[src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `fn into(self) -> U`[src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

#### `type Error = <U as TryFrom<T>>::Error`

The type returned in the event of a conversion error.

#### `fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

Performs the conversion.

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

####
ⓘImportant traits for &'_ mut F

### Important traits for &'_ mut F

`impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<R: Read + ?Sized, '_> Read for &'_ mut Rimpl<W: Write + ?Sized, '_> Write for &'_ mut W`
`fn borrow(&self) -> &T`[src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

####
ⓘImportant traits for &'_ mut F

### Important traits for &'_ mut F

`impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<R: Read + ?Sized, '_> Read for &'_ mut Rimpl<W: Write + ?Sized, '_> Write for &'_ mut W`
`fn borrow_mut(&mut self) -> &mut T`[src]

Mutably borrows from an owned value. Read more

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `fn type_id(&self) -> TypeId`[src]

Gets the `TypeId` of `self`. Read more

### `impl<T> ToOwned for T where
T: Clone,` [src]

#### `type Owned = T`

The resulting type after obtaining ownership.

#### `fn to_owned(&self) -> T`[src]

Creates owned data from borrowed data, usually by cloning. Read more

#### `fn clone_into(&self, target: &mut T)`[src]

🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

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