Struct std::ffi::os_str::OsString

pub struct OsString { /* private fields */ }

A type that can represent owned, mutable platform-native strings, but is cheaply inter-convertible with Rust strings.

The need for this type arises from the fact that:

• On Unix systems, strings are often arbitrary sequences of non-zero bytes, in many cases interpreted as UTF-8.

• On Windows, strings are often arbitrary sequences of non-zero 16-bit values, interpreted as UTF-16 when it is valid to do so.

• In Rust, strings are always valid UTF-8, which may contain zeros.

OsString and OsStr bridge this gap by simultaneously representing Rust and platform-native string values, and in particular allowing a Rust string to be converted into an “OS” string with no cost if possible. A consequence of this is that OsString instances are not NUL terminated; in order to pass to e.g., Unix system call, you should create a CStr.

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

Note, OsString and OsStr internally do not necessarily hold strings in the form native to the platform; While on Unix, strings are stored as a sequence of 8-bit values, on Windows, where strings are 16-bit value based as just discussed, strings are also actually stored as a sequence of 8-bit values, encoded in a less-strict variant of UTF-8. This is useful to understand when handling capacity and length values.

Capacity of OsString

Capacity uses units of UTF-8 bytes for OS strings which were created from valid unicode, and uses units of bytes in an unspecified encoding for other contents. On a given target, all OsString and OsStr values use the same units for capacity, so the following will work:

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

fn concat_os_strings(a: &OsStr, b: &OsStr) -> OsString {
    let mut ret = OsString::with_capacity(a.len() + b.len()); // This will allocate
    ret.push(a); // This will not allocate further
    ret.push(b); // This will not allocate further
    ret
}

Creating an OsString

From a Rust string: OsString implements From<String>, so you can use my_string.into() to create an OsString from a normal Rust string.

From slices: Just like you can start with an empty Rust String and then String::push_str some &str sub-string slices into it, you can create an empty OsString with the OsString::new method and then push string slices into it with the OsString::push method.

Extracting a borrowed reference to the whole OS string

You can use the OsString::as_os_str method to get an &OsStr from an OsString; this is effectively a borrowed reference to the whole string.

Conversions

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

Implementations

impl OsString

pub fn new() -> OsString

Constructs a new empty OsString.

Examples

use std::ffi::OsString;

let os_string = OsString::new();

pub unsafe fn from_encoded_bytes_unchecked(bytes: Vec<u8>) -> Self

Converts bytes to an OsString without checking that the bytes 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 OsString 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();

pub fn as_os_str(&self) -> &OsStr

Converts to an OsStr slice.

Examples

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

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

pub fn into_encoded_bytes(self) -> Vec<u8>

Converts the OsString into a byte slice. To convert the byte slice back into an OsString, 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 bytes over the network or storing it in a file will likely result in incompatible data. See OsString for more encoding details and std::ffi for platform-specific, specified conversions.

pub fn into_string(self) -> Result<String, OsString>

Converts the OsString into a String if it contains valid Unicode data.

On failure, ownership of the original OsString is returned.

Examples

use std::ffi::OsString;

let os_string = OsString::from("foo");
let string = os_string.into_string();
assert_eq!(string, Ok(String::from("foo")));

pub fn push<T: AsRef<OsStr>>(&mut self, s: T)

Extends the string with the given &OsStr slice.

Examples

use std::ffi::OsString;

let mut os_string = OsString::from("foo");
os_string.push("bar");
assert_eq!(&os_string, "foobar");

pub fn with_capacity(capacity: usize) -> OsString

Creates a new OsString with at least the given capacity.

The string will be able to hold at least capacity length units of other OS strings without reallocating. This method is allowed to allocate for more units than capacity. If capacity is 0, the string will not allocate.

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

Examples

use std::ffi::OsString;

let mut os_string = OsString::with_capacity(10);
let capacity = os_string.capacity();

// This push is done without reallocating
os_string.push("foo");

assert_eq!(capacity, os_string.capacity());

pub fn clear(&mut self)

Truncates the OsString to zero length.

Examples

use std::ffi::OsString;

let mut os_string = OsString::from("foo");
assert_eq!(&os_string, "foo");

os_string.clear();
assert_eq!(&os_string, "");

pub fn capacity(&self) -> usize

Returns the capacity this OsString can hold without reallocating.

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

Examples

use std::ffi::OsString;

let os_string = OsString::with_capacity(10);
assert!(os_string.capacity() >= 10);

pub fn reserve(&mut self, additional: usize)

Reserves capacity for at least additional more capacity to be inserted in the given OsString. Does nothing if the capacity is already sufficient.

The collection may reserve more space to speculatively avoid frequent reallocations.

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

Examples

use std::ffi::OsString;

let mut s = OsString::new();
s.reserve(10);
assert!(s.capacity() >= 10);

pub fn try_reserve(&mut self, additional: usize) -> Result<(), TryReserveError>

Tries to reserve capacity for at least additional more length units in the given OsString. The string may reserve more space to speculatively avoid frequent reallocations. After calling try_reserve, capacity will be greater than or equal to self.len() + additional if it returns Ok(()). Does nothing if capacity is already sufficient. This method preserves the contents even if an error occurs.

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

Errors

If the capacity overflows, or the allocator reports a failure, then an error is returned.

Examples

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

fn process_data(data: &str) -> Result<OsString, TryReserveError> {
    let mut s = OsString::new();

    // Pre-reserve the memory, exiting if we can't
    s.try_reserve(OsStr::new(data).len())?;

    // Now we know this can't OOM in the middle of our complex work
    s.push(data);

    Ok(s)
}

pub fn reserve_exact(&mut self, additional: usize)

Reserves the minimum capacity for at least additional more capacity to be inserted in the given OsString. Does nothing if the capacity is already sufficient.

Note that the allocator may give the collection more space than it requests. Therefore, capacity can not be relied upon to be precisely minimal. Prefer reserve if future insertions are expected.

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

Examples

use std::ffi::OsString;

let mut s = OsString::new();
s.reserve_exact(10);
assert!(s.capacity() >= 10);

pub fn try_reserve_exact( &mut self, additional: usize, ) -> Result<(), TryReserveError>

Tries to reserve the minimum capacity for at least additional more length units in the given OsString. After calling try_reserve_exact, capacity will be greater than or equal to self.len() + additional if it returns Ok(()). Does nothing if the capacity is already sufficient.

Note that the allocator may give the OsString more space than it requests. Therefore, capacity can not be relied upon to be precisely minimal. Prefer try_reserve if future insertions are expected.

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

Errors

If the capacity overflows, or the allocator reports a failure, then an error is returned.

Examples

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

fn process_data(data: &str) -> Result<OsString, TryReserveError> {
    let mut s = OsString::new();

    // Pre-reserve the memory, exiting if we can't
    s.try_reserve_exact(OsStr::new(data).len())?;

    // Now we know this can't OOM in the middle of our complex work
    s.push(data);

    Ok(s)
}

pub fn shrink_to_fit(&mut self)

Shrinks the capacity of the OsString to match its length.

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

Examples

use std::ffi::OsString;

let mut s = OsString::from("foo");

s.reserve(100);
assert!(s.capacity() >= 100);

s.shrink_to_fit();
assert_eq!(3, s.capacity());

pub fn shrink_to(&mut self, min_capacity: usize)

Shrinks the capacity of the OsString with a lower bound.

The capacity will remain at least as large as both the length and the supplied value.

If the current capacity is less than the lower limit, this is a no-op.

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

Examples

use std::ffi::OsString;

let mut s = OsString::from("foo");

s.reserve(100);
assert!(s.capacity() >= 100);

s.shrink_to(10);
assert!(s.capacity() >= 10);
s.shrink_to(0);
assert!(s.capacity() >= 3);

pub fn into_boxed_os_str(self) -> Box<OsStr>

Converts this OsString into a boxed OsStr.

Examples

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

let s = OsString::from("hello");

let b: Box<OsStr> = s.into_boxed_os_str();

pub fn leak<'a>(self) -> &'a mut OsStr

🔬This is a nightly-only experimental API. (os_string_pathbuf_leak #125965)

Consumes and leaks the OsString, returning a mutable reference to the contents, &'a mut OsStr.

The caller has free choice over the returned lifetime, including ’static. Indeed, this function is ideally used for data that lives for the remainder of the program’s life, as dropping the returned reference will cause a memory leak.

It does not reallocate or shrink the OsString, so the leaked allocation may include unused capacity that is not part of the returned slice. If you want to discard excess capacity, call into_boxed_os_str, and then Box::leak instead. However, keep in mind that trimming the capacity may result in a reallocation and copy.

Methods from Deref<Target = OsStr>

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"));

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");
}

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"));

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());

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);

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.

pub fn slice_encoded_bytes<R: RangeBounds<usize>>(&self, range: R) -> &Self

🔬This is a nightly-only experimental API. (os_str_slice #118485)

Takes a substring based on a range that corresponds to the return value of OsStr::as_encoded_bytes.

The range’s start and end must lie on valid OsStr boundaries. A valid OsStr boundary is one of:

• The start of the string
• The end of the string
• Immediately before a valid non-empty UTF-8 substring
• Immediately after a valid non-empty UTF-8 substring

Panics

Panics if range does not lie on valid OsStr boundaries or if it exceeds the end of the string.

Example

#![feature(os_str_slice)]

use std::ffi::OsStr;

let os_str = OsStr::new("foo=bar");
let bytes = os_str.as_encoded_bytes();
if let Some(index) = bytes.iter().position(|b| *b == b'=') {
    let key = os_str.slice_encoded_bytes(..index);
    let value = os_str.slice_encoded_bytes(index + 1..);
    assert_eq!(key, "foo");
    assert_eq!(value, "bar");
}

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);

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);

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());

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());

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());

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"));

pub fn display(&self) -> Display<'_>

🔬This is a nightly-only experimental API. (os_str_display #120048)

Returns an object that implements Display for safely printing an OsStr that may contain non-Unicode data. This may perform lossy conversion, depending on the platform. If you would like an implementation which escapes the OsStr please use Debug instead.

Examples

#![feature(os_str_display)]
use std::ffi::OsStr;

let s = OsStr::new("Hello, world!");
println!("{}", s.display());

Trait Implementations

impl AsRef<OsStr> for OsString

fn as_ref(&self) -> &OsStr

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<Path> for OsString

fn as_ref(&self) -> &Path

Converts this type into a shared reference of the (usually inferred) input type.

impl Borrow<OsStr> for OsString

fn borrow(&self) -> &OsStr

Immutably borrows from an owned value.

impl Clone for OsString

fn clone_from(&mut self, source: &Self)

Clones the contents of source into self.

This method is preferred over simply assigning source.clone() to self, as it avoids reallocation if possible.

fn clone(&self) -> Self

Returns a copy of the value.

impl Debug for OsString

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

Formats the value using the given formatter.

impl Default for OsString

fn default() -> OsString

Constructs an empty OsString.

impl Deref for OsString

type Target = OsStr

The resulting type after dereferencing.

fn deref(&self) -> &OsStr

Dereferences the value.

impl DerefMut for OsString

fn deref_mut(&mut self) -> &mut OsStr

Mutably dereferences the value.

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

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

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one #72631)

Extends a collection with exactly one element.

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.

impl<'a> Extend<Cow<'a, OsStr>> for OsString

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

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one #72631)

Extends a collection with exactly one element.

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.

impl Extend<OsString> for OsString

fn extend<T: IntoIterator<Item = OsString>>(&mut self, iter: T)

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one #72631)

Extends a collection with exactly one element.

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.

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

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

Converts the string reference into a Cow::Borrowed.

impl<T: ?Sized + AsRef<OsStr>> From<&T> for OsString

fn from(s: &T) -> OsString

Copies any value implementing AsRef<OsStr> into a newly allocated OsString.

impl From<Box<OsStr>> for OsString

fn from(boxed: Box<OsStr>) -> OsString

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

impl<'a> From<Cow<'a, OsStr>> for OsString

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

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

impl From<OsString> for Arc<OsStr>

fn from(s: OsString) -> Arc<OsStr>

Converts an OsString into an Arc<OsStr> by moving the OsString data into a new Arc buffer.

impl From<OsString> for Box<OsStr>

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

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

impl<'a> From<OsString> for Cow<'a, OsStr>

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

Moves the string into a Cow::Owned.

impl From<OsString> for PathBuf

fn from(s: OsString) -> PathBuf

Converts an OsString into a PathBuf.

This conversion does not allocate or copy memory.

impl From<OsString> for Rc<OsStr>

fn from(s: OsString) -> Rc<OsStr>

Converts an OsString into an Rc<OsStr> by moving the OsString data into a new Rc buffer.

impl From<PathBuf> for OsString

fn from(path_buf: PathBuf) -> OsString

Converts a PathBuf into an OsString

This conversion does not allocate or copy memory.

impl From<String> for OsString

fn from(s: String) -> OsString

Converts a String into an OsString.

This conversion does not allocate or copy memory.

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

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

Creates a value from an iterator.

impl<'a> FromIterator<Cow<'a, OsStr>> for OsString

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

Creates a value from an iterator.

impl FromIterator<OsString> for OsString

fn from_iter<I: IntoIterator<Item = OsString>>(iter: I) -> Self

Creates a value from an iterator.

impl FromStr for OsString

type Err = Infallible

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for OsString

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Index<RangeFull> for OsString

type Output = OsStr

The returned type after indexing.

fn index(&self, _index: RangeFull) -> &OsStr

Performs the indexing (container[index]) operation.

impl IndexMut<RangeFull> for OsString

fn index_mut(&mut self, _index: RangeFull) -> &mut OsStr

Performs the mutable indexing (container[index]) operation.

impl Ord for OsString

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

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl OsStringExt for OsString

Available on Unix only.

fn from_vec(vec: Vec<u8>) -> OsString

Creates an OsString from a byte vector.

fn into_vec(self) -> Vec<u8>

Yields the underlying byte vector of this OsString.

impl OsStringExt for OsString

Available on WASI only.

fn from_vec(vec: Vec<u8>) -> OsString

Creates an OsString from a byte vector.

fn into_vec(self) -> Vec<u8>

Yields the underlying byte vector of this OsString.

impl OsStringExt for OsString

Available on Windows only.

fn from_wide(wide: &[u16]) -> OsString

Creates an OsString from a potentially ill-formed UTF-16 slice of 16-bit code units.

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

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> PartialEq<&'a Path> for OsString

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq<&str> for OsString

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> PartialEq<Cow<'a, Path>> for OsString

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> PartialEq<OsString> for &'a Path

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> PartialEq<OsString> for &'a str

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> PartialEq<OsString> for Cow<'a, Path>

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq<OsString> for Path

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq<OsString> for PathBuf

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq<OsString> for str

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq<Path> for OsString

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq<PathBuf> for OsString

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq<str> for OsString

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq for OsString

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'a> PartialOrd<&'a Path> for OsString

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

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

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'a> PartialOrd<Cow<'a, Path>> for OsString

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

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

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

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

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'a> PartialOrd<OsString> for &'a Path

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

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

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'a> PartialOrd<OsString> for Cow<'a, Path>

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

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

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl PartialOrd<OsString> for Path

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl PartialOrd<OsString> for PathBuf

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl PartialOrd<Path> for OsString

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl PartialOrd<PathBuf> for OsString

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl PartialOrd<str> for OsString

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl PartialOrd for OsString

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Write for OsString

fn write_str(&mut self, s: &str) -> Result

Writes a string slice into this writer, returning whether the write succeeded.

fn write_char(&mut self, c: char) -> Result<(), Error>

Writes a char into this writer, returning whether the write succeeded.

fn write_fmt(&mut self, args: Arguments<'_>) -> Result<(), Error>

Glue for usage of the write! macro with implementors of this trait.

impl Eq for OsString