# Struct std::ffi::OsStr

1.0.0 · source ·

    pub struct OsStr { /* private fields */ }

Expand description

Borrowed reference to an OS string (see `OsString`).

This type represents a borrowed reference to a string in the operating system’s preferred representation.

`&OsStr` is to `OsString` as `&str` is to `String`: the former in each pair are borrowed references; the latter are owned strings.

See the module’s toplevel documentation about conversions for a discussion on the traits which `OsStr` implements for conversions from/to native representations.

## Implementations§

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### impl OsStr

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#### pub fn new<S: AsRef<OsStr> + ?Sized>(s: &S) -> &OsStr

Coerces into an `OsStr` slice.

##### Examples

    use std::ffi::OsStr;

    let os_str = OsStr::new("foo");

Run
1.74.0 · source

#### pub unsafe fn from_encoded_bytes_unchecked(bytes: &[u8]) -> &Self

Converts a slice of bytes to an OS string slice without checking that the string contains valid `OsStr`-encoded data.

The byte encoding is an unspecified, platform-specific, self-synchronizing superset of UTF-8. By being a self-synchronizing superset of UTF-8, this encoding is also a superset of 7-bit ASCII.

See the module’s toplevel documentation about conversions for safe, cross-platform conversions from/to native representations.

##### Safety

As the encoding is unspecified, callers must pass in bytes that originated as a mixture of validated UTF-8 and bytes from `OsStr::as_encoded_bytes` from within the same rust version built for the same target platform. For example, reconstructing an `OsStr` from bytes sent over the network or stored in a file will likely violate these safety rules.

Due to the encoding being self-synchronizing, the bytes from `OsStr::as_encoded_bytes` can be split either immediately before or immediately after any valid non-empty UTF-8 substring.

##### Example

    use std::ffi::OsStr;

    let os_str = OsStr::new("Mary had a little lamb");
    let bytes = os_str.as_encoded_bytes();
    let words = bytes.split(|b| *b == b' ');
    let words: Vec<&OsStr> = words.map(|word| {
        // SAFETY:
        // - Each `word` only contains content that originated from `OsStr::as_encoded_bytes`
        // - Only split with ASCII whitespace which is a non-empty UTF-8 substring
        unsafe { OsStr::from_encoded_bytes_unchecked(word) }
    }).collect();

Run
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#### pub fn to_str(&self) -> Option<&str>

Yields a `&str` slice if the `OsStr` is valid Unicode.

This conversion may entail doing a check for UTF-8 validity.

##### Examples

    use std::ffi::OsStr;

    let os_str = OsStr::new("foo");
    assert_eq!(os_str.to_str(), Some("foo"));

Run
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#### pub fn to_string_lossy(&self) -> Cow<'_, str>

Converts an `OsStr` to a `Cow<str>`.

Any non-Unicode sequences are replaced with `U+FFFD REPLACEMENT CHARACTER`.

##### Examples

Calling `to_string_lossy` on an `OsStr` with invalid unicode:

    // Note, due to differences in how Unix and Windows represent strings,
    // we are forced to complicate this example, setting up example `OsStr`s
    // with different source data and via different platform extensions.
    // Understand that in reality you could end up with such example invalid
    // sequences simply through collecting user command line arguments, for
    // example.

    #[cfg(unix)] {
        use std::ffi::OsStr;
        use std::os::unix::ffi::OsStrExt;

        // Here, the values 0x66 and 0x6f correspond to 'f' and 'o'
        // respectively. The value 0x80 is a lone continuation byte, invalid
        // in a UTF-8 sequence.
        let source = [0x66, 0x6f, 0x80, 0x6f];
        let os_str = OsStr::from_bytes(&source[..]);

        assert_eq!(os_str.to_string_lossy(), "fo�o");
    }
    #[cfg(windows)] {
        use std::ffi::OsString;
        use std::os::windows::prelude::*;

        // Here the values 0x0066 and 0x006f correspond to 'f' and 'o'
        // respectively. The value 0xD800 is a lone surrogate half, invalid
        // in a UTF-16 sequence.
        let source = [0x0066, 0x006f, 0xD800, 0x006f];
        let os_string = OsString::from_wide(&source[..]);
        let os_str = os_string.as_os_str();

        assert_eq!(os_str.to_string_lossy(), "fo�o");
    }

Run
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#### pub fn to_os_string(&self) -> OsString

Copies the slice into an owned `OsString`.

##### Examples

    use std::ffi::{OsStr, OsString};

    let os_str = OsStr::new("foo");
    let os_string = os_str.to_os_string();
    assert_eq!(os_string, OsString::from("foo"));

Run
1.9.0 · source

#### pub fn is_empty(&self) -> bool

Checks whether the `OsStr` is empty.

##### Examples

    use std::ffi::OsStr;

    let os_str = OsStr::new("");
    assert!(os_str.is_empty());

    let os_str = OsStr::new("foo");
    assert!(!os_str.is_empty());

Run
1.9.0 · source

#### pub fn len(&self) -> usize

Returns the length of this `OsStr`.

Note that this does not return the number of bytes in the string in OS string form.

The length returned is that of the underlying storage used by `OsStr`. As discussed in the `OsString` introduction, `OsString` and `OsStr` store strings in a form best suited for cheap inter-conversion between native-platform and Rust string forms, which may differ significantly from both of them, including in storage size and encoding.

This number is simply useful for passing to other methods, like `OsString::with_capacity` to avoid reallocations.

See the main `OsString` documentation information about encoding and capacity units.

##### Examples

    use std::ffi::OsStr;

    let os_str = OsStr::new("");
    assert_eq!(os_str.len(), 0);

    let os_str = OsStr::new("foo");
    assert_eq!(os_str.len(), 3);

Run
1.20.0 · source

#### pub fn into_os_string(self: Box<OsStr>) -> OsString

Converts a `Box<OsStr>` into an `OsString` without copying or allocating.

1.74.0 · source

#### pub fn as_encoded_bytes(&self) -> &[u8] ⓘ

Converts an OS string slice to a byte slice. To convert the byte slice back into an OS string slice, use the `OsStr::from_encoded_bytes_unchecked` function.

The byte encoding is an unspecified, platform-specific, self-synchronizing superset of UTF-8. By being a self-synchronizing superset of UTF-8, this encoding is also a superset of 7-bit ASCII.

Note: As the encoding is unspecified, any sub-slice of bytes that is not valid UTF-8 should be treated as opaque and only comparable within the same rust version built for the same target platform. For example, sending the slice over the network or storing it in a file will likely result in incompatible byte slices. See `OsString` for more encoding details and `std::ffi` for platform-specific, specified conversions.

1.53.0 · source

#### pub fn make_ascii_lowercase(&mut self)

Converts this string to its ASCII lower case equivalent in-place.

ASCII letters ‘A’ to ‘Z’ are mapped to ‘a’ to ‘z’, but non-ASCII letters are unchanged.

To return a new lowercased value without modifying the existing one, use `OsStr::to_ascii_lowercase`.

##### Examples

    use std::ffi::OsString;

    let mut s = OsString::from("GRÜßE, JÜRGEN ❤");

    s.make_ascii_lowercase();

    assert_eq!("grÜße, jÜrgen ❤", s);

Run
1.53.0 · source

#### pub fn make_ascii_uppercase(&mut self)

Converts this string to its ASCII upper case equivalent in-place.

ASCII letters ‘a’ to ‘z’ are mapped to ‘A’ to ‘Z’, but non-ASCII letters are unchanged.

To return a new uppercased value without modifying the existing one, use `OsStr::to_ascii_uppercase`.

##### Examples

    use std::ffi::OsString;

    let mut s = OsString::from("Grüße, Jürgen ❤");

    s.make_ascii_uppercase();

    assert_eq!("GRüßE, JüRGEN ❤", s);

Run
1.53.0 · source

#### pub fn to_ascii_lowercase(&self) -> OsString

Returns a copy of this string where each character is mapped to its ASCII lower case equivalent.

ASCII letters ‘A’ to ‘Z’ are mapped to ‘a’ to ‘z’, but non-ASCII letters are unchanged.

To lowercase the value in-place, use `OsStr::make_ascii_lowercase`.

##### Examples

    use std::ffi::OsString;
    let s = OsString::from("Grüße, Jürgen ❤");

    assert_eq!("grüße, jürgen ❤", s.to_ascii_lowercase());

Run
1.53.0 · source

#### pub fn to_ascii_uppercase(&self) -> OsString

Returns a copy of this string where each character is mapped to its ASCII upper case equivalent.

ASCII letters ‘a’ to ‘z’ are mapped to ‘A’ to ‘Z’, but non-ASCII letters are unchanged.

To uppercase the value in-place, use `OsStr::make_ascii_uppercase`.

##### Examples

    use std::ffi::OsString;
    let s = OsString::from("Grüße, Jürgen ❤");

    assert_eq!("GRüßE, JüRGEN ❤", s.to_ascii_uppercase());

Run
1.53.0 · source

#### pub fn is_ascii(&self) -> bool

Checks if all characters in this string are within the ASCII range.

##### Examples

    use std::ffi::OsString;

    let ascii = OsString::from("hello!\n");
    let non_ascii = OsString::from("Grüße, Jürgen ❤");

    assert!(ascii.is_ascii());
    assert!(!non_ascii.is_ascii());

Run
1.53.0 · source

#### pub fn eq_ignore_ascii_case<S: AsRef<OsStr>>(&self, other: S) -> bool

Checks that two strings are an ASCII case-insensitive match.

Same as `to_ascii_lowercase(a) == to_ascii_lowercase(b)`, but without allocating and copying temporaries.

##### Examples

    use std::ffi::OsString;

    assert!(OsString::from("Ferris").eq_ignore_ascii_case("FERRIS"));
    assert!(OsString::from("Ferrös").eq_ignore_ascii_case("FERRöS"));
    assert!(!OsString::from("Ferrös").eq_ignore_ascii_case("FERRÖS"));

Run

## Trait Implementations§

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### impl AsRef<OsStr> for Component<'_>

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#### fn as_ref(&self) -> &OsStr

Converts this type into a shared reference of the (usually inferred) input type.
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### impl AsRef<OsStr> for Components<'_>

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#### fn as_ref(&self) -> &OsStr

Converts this type into a shared reference of the (usually inferred) input type.
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### impl AsRef<OsStr> for Iter<'_>

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#### fn as_ref(&self) -> &OsStr

Converts this type into a shared reference of the (usually inferred) input type.
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### impl AsRef<OsStr> for OsStr

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#### fn as_ref(&self) -> &OsStr

Converts this type into a shared reference of the (usually inferred) input type.
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### impl AsRef<OsStr> for OsString

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#### fn as_ref(&self) -> &OsStr

Converts this type into a shared reference of the (usually inferred) input type.
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### impl AsRef<OsStr> for Path

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#### fn as_ref(&self) -> &OsStr

Converts this type into a shared reference of the (usually inferred) input type.
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### impl AsRef<OsStr> for PathBuf

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#### fn as_ref(&self) -> &OsStr

Converts this type into a shared reference of the (usually inferred) input type.
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### impl AsRef<OsStr> for String

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#### fn as_ref(&self) -> &OsStr

Converts this type into a shared reference of the (usually inferred) input type.
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### impl AsRef<OsStr> for str

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#### fn as_ref(&self) -> &OsStr

Converts this type into a shared reference of the (usually inferred) input type.
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### impl AsRef<Path> for OsStr

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#### fn as_ref(&self) -> &Path

Converts this type into a shared reference of the (usually inferred) input type.
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### impl Borrow<OsStr> for OsString

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#### fn borrow(&self) -> &OsStr

Immutably borrows from an owned value. Read more
1.29.0 · source§

### impl Clone for Box<OsStr>

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#### fn clone(&self) -> Self

Returns a copy of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl Debug for OsStr

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#### fn fmt(&self, formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
1.9.0 · source§

### impl Default for &OsStr

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#### fn default() -> Self

Creates an empty `OsStr`.

1.17.0 · source§

### impl Default for Box<OsStr>

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#### fn default() -> Box<OsStr>

Returns the “default value” for a type. Read more
1.52.0 · source§

### impl<'a> Extend<&'a OsStr> for OsString

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#### fn extend<T: IntoIterator<Item = &'a OsStr>>(&mut self, iter: T)

Extends a collection with the contents of an iterator. Read more
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#### fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (`extend_one` #72631)
Extends a collection with exactly one element.
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#### fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (`extend_one` #72631)
Reserves capacity in a collection for the given number of additional elements. Read more
1.24.0 · source§

### impl From<&OsStr> for Arc<OsStr>

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#### fn from(s: &OsStr) -> Arc<OsStr>

Copies the string into a newly allocated `Arc<OsStr>`.

1.17.0 · source§

### impl From<&OsStr> for Box<OsStr>

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#### fn from(s: &OsStr) -> Box<OsStr>

Copies the string into a newly allocated `Box<OsStr>`.

1.28.0 · source§

### impl<'a> From<&'a OsStr> for Cow<'a, OsStr>

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#### fn from(s: &'a OsStr) -> Cow<'a, OsStr>

Converts the string reference into a `Cow::Borrowed`.

1.24.0 · source§

### impl From<&OsStr> for Rc<OsStr>

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#### fn from(s: &OsStr) -> Rc<OsStr>

Copies the string into a newly allocated `Rc<OsStr>`.

1.45.0 · source§

### impl From<Cow<'_, OsStr>> for Box<OsStr>

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#### fn from(cow: Cow<'_, OsStr>) -> Box<OsStr>

Converts a `Cow<'a, OsStr>` into a `Box<OsStr>`, by copying the contents if they are borrowed.

1.20.0 · source§

### impl From<OsString> for Box<OsStr>

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#### fn from(s: OsString) -> Box<OsStr>

Converts an `OsString` into a `Box<OsStr>` without copying or allocating.

1.52.0 · source§

### impl<'a> FromIterator<&'a OsStr> for OsString

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#### fn from_iter<I: IntoIterator<Item = &'a OsStr>>(iter: I) -> Self

Creates a value from an iterator. Read more
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### impl Hash for OsStr

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#### fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given `Hasher`. Read more
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### impl<S: Borrow<OsStr>> Join<&OsStr> for [S]

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#### type Output = OsString

🔬This is a nightly-only experimental API. (`slice_concat_trait` #27747)
The resulting type after concatenation
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#### fn join(slice: &Self, sep: &OsStr) -> OsString

🔬This is a nightly-only experimental API. (`slice_concat_trait` #27747)
Implementation of `[T]::join`
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### impl Ord for OsStr

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#### fn cmp(&self, other: &OsStr) -> Ordering

This method returns an `Ordering` between `self` and `other`. Read more
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### impl OsStrExt for OsStr

Available on WASI only.
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#### fn from_bytes(slice: &[u8]) -> &OsStr

Creates an `OsStr` from a byte slice. Read more
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#### fn as_bytes(&self) -> &[u8] ⓘ

Gets the underlying byte view of the `OsStr` slice. Read more
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### impl OsStrExt for OsStr

Available on Unix only.
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#### fn from_bytes(slice: &[u8]) -> &OsStr

Creates an `OsStr` from a byte slice. Read more
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#### fn as_bytes(&self) -> &[u8] ⓘ

Gets the underlying byte view of the `OsStr` slice. Read more
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### impl OsStrExt for OsStr

Available on Windows only.
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#### fn encode_wide(&self) -> EncodeWide<'_> ⓘ

Re-encodes an `OsStr` as a wide character sequence, i.e., potentially ill-formed UTF-16. Read more
1.8.0 · source§

### impl<'a, 'b> PartialEq<&'b OsStr> for Cow<'a, OsStr>

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#### fn eq(&self, other: &&'b OsStr) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a, 'b> PartialEq<&'b OsStr> for Cow<'a, Path>

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#### fn eq(&self, other: &&'b OsStr) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a, 'b> PartialEq<&'a OsStr> for OsString

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#### fn eq(&self, other: &&'a OsStr) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a> PartialEq<&'a OsStr> for Path

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#### fn eq(&self, other: &&'a OsStr) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a> PartialEq<&'a OsStr> for PathBuf

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#### fn eq(&self, other: &&'a OsStr) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a> PartialEq<&'a Path> for OsStr

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#### fn eq(&self, other: &&'a Path) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for &'b OsStr

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#### fn eq(&self, other: &Cow<'a, OsStr>) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for OsStr

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#### fn eq(&self, other: &Cow<'a, OsStr>) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a, 'b> PartialEq<Cow<'a, Path>> for &'b OsStr

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#### fn eq(&self, other: &Cow<'a, Path>) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a> PartialEq<Cow<'a, Path>> for OsStr

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#### fn eq(&self, other: &Cow<'a, Path>) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a> PartialEq<OsStr> for &'a Path

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#### fn eq(&self, other: &OsStr) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a, 'b> PartialEq<OsStr> for Cow<'a, OsStr>

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#### fn eq(&self, other: &OsStr) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a> PartialEq<OsStr> for Cow<'a, Path>

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#### fn eq(&self, other: &OsStr) -> bool

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

#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a, 'b> PartialEq<OsStr> for OsString

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#### fn eq(&self, other: &OsStr) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl PartialEq<OsStr> for Path

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#### fn eq(&self, other: &OsStr) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl PartialEq<OsStr> for PathBuf

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#### fn eq(&self, other: &OsStr) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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### impl PartialEq<OsStr> for str

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#### fn eq(&self, other: &OsStr) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a, 'b> PartialEq<OsString> for &'a OsStr

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#### fn eq(&self, other: &OsString) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a, 'b> PartialEq<OsString> for OsStr

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#### fn eq(&self, other: &OsString) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a> PartialEq<Path> for &'a OsStr

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#### fn eq(&self, other: &Path) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl PartialEq<Path> for OsStr

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#### fn eq(&self, other: &Path) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a> PartialEq<PathBuf> for &'a OsStr

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#### fn eq(&self, other: &PathBuf) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl PartialEq<PathBuf> for OsStr

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#### fn eq(&self, other: &PathBuf) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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### impl PartialEq<str> for OsStr

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#### fn eq(&self, other: &str) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
source§

### impl PartialEq for OsStr

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#### fn eq(&self, other: &OsStr) -> bool

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

#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.8.0 · source§

### impl<'a, 'b> PartialOrd<&'b OsStr> for Cow<'a, OsStr>

source§

#### fn partial_cmp(&self, other: &&'b OsStr) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a, 'b> PartialOrd<&'b OsStr> for Cow<'a, Path>

source§

#### fn partial_cmp(&self, other: &&'b OsStr) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a, 'b> PartialOrd<&'a OsStr> for OsString

source§

#### fn partial_cmp(&self, other: &&'a OsStr) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a> PartialOrd<&'a OsStr> for Path

source§

#### fn partial_cmp(&self, other: &&'a OsStr) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a> PartialOrd<&'a OsStr> for PathBuf

source§

#### fn partial_cmp(&self, other: &&'a OsStr) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a> PartialOrd<&'a Path> for OsStr

source§

#### fn partial_cmp(&self, other: &&'a Path) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a, 'b> PartialOrd<Cow<'a, OsStr>> for &'b OsStr

source§

#### fn partial_cmp(&self, other: &Cow<'a, OsStr>) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a, 'b> PartialOrd<Cow<'a, OsStr>> for OsStr

source§

#### fn partial_cmp(&self, other: &Cow<'a, OsStr>) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a, 'b> PartialOrd<Cow<'a, Path>> for &'b OsStr

source§

#### fn partial_cmp(&self, other: &Cow<'a, Path>) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a> PartialOrd<Cow<'a, Path>> for OsStr

source§

#### fn partial_cmp(&self, other: &Cow<'a, Path>) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a> PartialOrd<OsStr> for &'a Path

source§

#### fn partial_cmp(&self, other: &OsStr) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a, 'b> PartialOrd<OsStr> for Cow<'a, OsStr>

source§

#### fn partial_cmp(&self, other: &OsStr) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a> PartialOrd<OsStr> for Cow<'a, Path>

source§

#### fn partial_cmp(&self, other: &OsStr) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a, 'b> PartialOrd<OsStr> for OsString

source§

#### fn partial_cmp(&self, other: &OsStr) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl PartialOrd<OsStr> for Path

source§

#### fn partial_cmp(&self, other: &OsStr) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl PartialOrd<OsStr> for PathBuf

source§

#### fn partial_cmp(&self, other: &OsStr) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a, 'b> PartialOrd<OsString> for &'a OsStr

source§

#### fn partial_cmp(&self, other: &OsString) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a, 'b> PartialOrd<OsString> for OsStr

source§

#### fn partial_cmp(&self, other: &OsString) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a> PartialOrd<Path> for &'a OsStr

source§

#### fn partial_cmp(&self, other: &Path) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl PartialOrd<Path> for OsStr

source§

#### fn partial_cmp(&self, other: &Path) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl<'a> PartialOrd<PathBuf> for &'a OsStr

source§

#### fn partial_cmp(&self, other: &PathBuf) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl PartialOrd<PathBuf> for OsStr

source§

#### fn partial_cmp(&self, other: &PathBuf) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl PartialOrd<str> for OsStr

source§

#### fn partial_cmp(&self, other: &str) -> Option<Ordering>

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

#### fn lt(&self, other: &Rhs) -> bool

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

#### fn le(&self, other: &Rhs) -> bool

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

#### fn gt(&self, other: &Rhs) -> bool

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

#### fn ge(&self, other: &Rhs) -> bool

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

### impl PartialOrd for OsStr

source§

#### fn partial_cmp(&self, other: &OsStr) -> Option<Ordering>

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

#### fn lt(&self, other: &OsStr) -> bool

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

#### fn le(&self, other: &OsStr) -> bool

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

#### fn gt(&self, other: &OsStr) -> bool

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

#### fn ge(&self, other: &OsStr) -> bool

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

### impl ToOwned for OsStr

§

#### type Owned = OsString

The resulting type after obtaining ownership.
source§

#### fn to_owned(&self) -> OsString

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

#### fn clone_into(&self, target: &mut OsString)

Uses borrowed data to replace owned data, usually by cloning. Read more
1.72.0 · source§

### impl<'a> TryFrom<&'a OsStr> for &'a str

source§

#### fn try_from(value: &'a OsStr) -> Result<Self, Self::Error>

Tries to convert an `&OsStr` to a `&str`.

    use std::ffi::OsStr;

    let os_str = OsStr::new("foo");
    let as_str = <&str>::try_from(os_str).unwrap();
    assert_eq!(as_str, "foo");

Run
§

#### type Error = Utf8Error

The type returned in the event of a conversion error.
source§

### impl Eq for OsStr

## Auto Trait Implementations§

§

### impl RefUnwindSafe for OsStr

§

### impl Send for OsStr

§

### impl !Sized for OsStr

§

### impl Sync for OsStr

§

### impl Unpin for OsStr

§

### impl UnwindSafe for OsStr

## Blanket Implementations§

source§

### impl<T> Any for Twhere T: 'static + ?Sized,

source§

#### fn type_id(&self) -> TypeId

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

### impl<T> Borrow<T> for Twhere T: ?Sized,

source§

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

### impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more