pub struct OsString { /* fields omitted */ }
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.
OsString is to OsStr as String is to &str: the former in each pair are owned strings; the latter are borrowed references.
OsString
From a Rust string: OsString implements From<String>, so you can use my_string.from to create an OsString from a normal Rust string.
From slices: Just like you can start with an empty Rust String and then push_str &str sub-string slices into it, you can create an empty OsString with the new method and then push string slices into it with the push method.
You can use the as_os_str method to get an &OsStr from an OsString; this is effectively a borrowed reference to the whole string.
See the [module's toplevel documentation about conversions][conversions] for a discussion on the traits which OsString implements for conversions from/to native representations.
impl OsString
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pub fn new() -> OsString
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Constructs a new empty OsString.
use std::ffi::OsString; let os_string = OsString::new();
pub fn as_os_str(&self) -> &OsStr
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Converts to an OsStr slice.
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_string(self) -> Result<String, OsString>
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Converts the OsString into a String if it contains valid Unicode data.
On failure, ownership of the original OsString is returned.
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)
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Extends the string with the given &OsStr slice.
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 the given capacity.
The string will be able to hold exactly capacity length units of other OS strings without reallocating. If capacity is 0, the string will not allocate.
See main OsString documentation information about encoding.
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.
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 OsString introduction for information about encoding.
use std::ffi::OsString; let mut 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.
The collection may reserve more space to avoid frequent reallocations.
use std::ffi::OsString; let mut s = OsString::new(); s.reserve(10); assert!(s.capacity() >= 10);
pub fn reserve_exact(&mut self, additional: usize)
Reserves the minimum capacity for exactly 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.
use std::ffi::OsString; let mut s = OsString::new(); s.reserve_exact(10); assert!(s.capacity() >= 10);
pub fn shrink_to_fit(&mut self)
Shrinks the capacity of the OsString to match its length.
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 into_boxed_os_str(self) -> Box<OsStr>
Converts this OsString into a boxed OsStr.
use std::ffi::{OsString, OsStr};
let s = OsString::from("hello");
let b: Box<OsStr> = s.into_boxed_os_str(); pub fn to_str(&self) -> Option<&str>
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Yields a &str slice if the OsStr is valid Unicode.
This conversion may entail doing a check for UTF-8 validity.
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>
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Converts an OsStr to a Cow<str>.
Any non-Unicode sequences are replaced with U+FFFD REPLACEMENT CHARACTER.
Calling to_string_lossy on an OsStr with valid unicode:
use std::ffi::OsStr;
let os_str = OsStr::new("foo");
assert_eq!(os_str.to_string_lossy(), "foo"); Had os_str contained invalid unicode, the to_string_lossy call might have returned "fo�".
pub fn to_os_string(&self) -> OsString
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Copies the slice into an owned OsString.
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.
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 this string as, for example, OS strings on Windows are encoded as a list of u16 rather than a list of bytes. This number is simply useful for passing to other methods like OsString::with_capacity to avoid reallocations.
See OsStr introduction for more information about encoding.
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); impl Clone for OsString
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fn clone(&self) -> OsString
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source. Read more
impl From<String> for OsString
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fn from(s: String) -> OsString
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Performs the conversion.
impl<'a, T: ?Sized + AsRef<OsStr>> From<&'a T> for OsString
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fn from(s: &'a T) -> OsString
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Performs the conversion.
impl Index<RangeFull> for OsString
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type Output = OsStrThe returned type after indexing.
fn index(&self, _index: RangeFull) -> &OsStr
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Performs the indexing (container[index]) operation.
impl Deref for OsString
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type Target = OsStrThe resulting type after dereferencing.
fn deref(&self) -> &OsStr
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Dereferences the value.
impl Default for OsString
fn default() -> OsString
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Constructs an empty OsString.
impl Debug for OsString
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fn fmt(&self, formatter: &mut Formatter) -> Result
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Formats the value using the given formatter. Read more
impl PartialEq for OsString
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fn eq(&self, other: &OsString) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl PartialEq<str> for OsString
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fn eq(&self, other: &str) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl PartialEq<OsString> for str
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fn eq(&self, other: &OsString) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl Eq for OsString
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impl PartialOrd for OsString
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fn partial_cmp(&self, other: &OsString) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &OsString) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &OsString) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &OsString) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &OsString) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl PartialOrd<str> for OsString
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fn partial_cmp(&self, other: &str) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl Ord for OsString
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fn cmp(&self, other: &OsString) -> Ordering
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This method returns an Ordering between self and other. Read more
fn max(self, other: Self) -> Self
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self
Compares and returns the minimum of two values. Read more
impl Hash for OsString
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fn hash<H: Hasher>(&self, state: &mut H)
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Feeds this value into the given [Hasher]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
Feeds a slice of this type into the given [Hasher]. Read more
impl From<Box<OsStr>> for OsString
fn from(boxed: Box<OsStr>) -> OsString
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Performs the conversion.
impl From<OsString> for Box<OsStr>
fn from(s: OsString) -> Box<OsStr>
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Performs the conversion.
impl<'a, 'b> PartialEq<OsStr> for OsString
fn eq(&self, other: &OsStr) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialEq<OsString> for OsStr
fn eq(&self, other: &OsString) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialOrd<OsStr> for OsString
fn partial_cmp(&self, other: &OsStr) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl<'a, 'b> PartialOrd<OsString> for OsStr
fn partial_cmp(&self, other: &OsString) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl<'a, 'b> PartialEq<&'a OsStr> for OsString
fn eq(&self, other: &&'a OsStr) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialEq<OsString> for &'a OsStr
fn eq(&self, other: &OsString) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialOrd<&'a OsStr> for OsString
fn partial_cmp(&self, other: &&'a OsStr) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl<'a, 'b> PartialOrd<OsString> for &'a OsStr
fn partial_cmp(&self, other: &OsString) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl<'a, 'b> PartialEq<OsString> for Cow<'a, OsStr>
fn eq(&self, other: &OsString) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for OsString
fn eq(&self, other: &Cow<'a, OsStr>) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialOrd<OsString> for Cow<'a, OsStr>
fn partial_cmp(&self, other: &OsString) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl<'a, 'b> PartialOrd<Cow<'a, OsStr>> for OsString
fn partial_cmp(&self, other: &Cow<'a, OsStr>) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl Borrow<OsStr> for OsString
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fn borrow(&self) -> &OsStr
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Immutably borrows from an owned value. Read more
impl AsRef<OsStr> for OsString
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fn as_ref(&self) -> &OsStr
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Performs the conversion.
impl From<OsString> for PathBuf
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fn from(s: OsString) -> PathBuf
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Performs the conversion.
impl From<PathBuf> for OsString
fn from(path_buf: PathBuf) -> OsString
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Performs the conversion.
impl AsRef<Path> for OsString
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fn as_ref(&self) -> &Path
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Performs the conversion.
impl<'a, 'b> PartialEq<OsString> for PathBuf
fn eq(&self, other: &OsString) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialEq<PathBuf> for OsString
fn eq(&self, other: &PathBuf) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialOrd<OsString> for PathBuf
fn partial_cmp(&self, other: &OsString) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl<'a, 'b> PartialOrd<PathBuf> for OsString
fn partial_cmp(&self, other: &PathBuf) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl<'a, 'b> PartialEq<OsString> for Path
fn eq(&self, other: &OsString) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialEq<Path> for OsString
fn eq(&self, other: &Path) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialOrd<OsString> for Path
fn partial_cmp(&self, other: &OsString) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl<'a, 'b> PartialOrd<Path> for OsString
fn partial_cmp(&self, other: &Path) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl<'a, 'b> PartialEq<OsString> for &'a Path
fn eq(&self, other: &OsString) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialEq<&'a Path> for OsString
fn eq(&self, other: &&'a Path) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialOrd<OsString> for &'a Path
fn partial_cmp(&self, other: &OsString) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl<'a, 'b> PartialOrd<&'a Path> for OsString
fn partial_cmp(&self, other: &&'a Path) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl<'a, 'b> PartialEq<OsString> for Cow<'a, Path>
fn eq(&self, other: &OsString) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialEq<Cow<'a, Path>> for OsString
fn eq(&self, other: &Cow<'a, Path>) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, other: &Rhs) -> bool
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This method tests for !=.
impl<'a, 'b> PartialOrd<OsString> for Cow<'a, Path>
fn partial_cmp(&self, other: &OsString) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl<'a, 'b> PartialOrd<Cow<'a, Path>> for OsString
fn partial_cmp(&self, other: &Cow<'a, Path>) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, other: &Rhs) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, other: &Rhs) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, other: &Rhs) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl OsStringExt for OsString
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fn from_vec(vec: Vec<u8>) -> OsString
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Creates an [OsString] from a byte vector. Read more
fn into_vec(self) -> Vec<u8>
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Yields the underlying byte vector of this [OsString]. Read more
impl OsStringExt for OsString
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fn from_wide(wide: &[u16]) -> OsString
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Creates an OsString from a potentially ill-formed UTF-16 slice of 16-bit code units. Read more
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/ffi/struct.OsString.html