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

# Enum std::path::Prefix 1.0.0 [−] [src]

    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> 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

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

#### `fn fmt(&self, __arg_0: &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, __arg_0: &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> PartialOrd for Prefix<'a>`
[src]

#### `fn partial_cmp(&self, __arg_0: &Prefix<'a>) -> Option<Ordering>`
[src]

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

#### `fn lt(&self, __arg_0: &Prefix<'a>) -> bool`
[src]

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

#### `fn le(&self, __arg_0: &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, __arg_0: &Prefix<'a>) -> bool`
[src]

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

#### `fn ge(&self, __arg_0: &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> Ord for Prefix<'a>`
[src]

#### `fn cmp(&self, __arg_0: &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

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

#### `fn eq(&self, __arg_0: &Prefix<'a>) -> bool`
[src]

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

#### `fn ne(&self, __arg_0: &Prefix<'a>) -> bool`
[src]

This method tests for `!=`.

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

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