Type Alias rustc_target::spec::StaticCow
source · type StaticCow<T> = Cow<'static, T>;
Aliased Type§
enum StaticCow<T> {
Borrowed(&'static T),
Owned(<T as ToOwned>::Owned),
}
Variants§
Layout§
Note: Encountered an error during type layout; the type failed to be normalized.
Implementations
source§impl<B> Cow<'_, B>
impl<B> Cow<'_, B>
sourcepub const fn is_borrowed(&self) -> bool
🔬This is a nightly-only experimental API. (cow_is_borrowed
)
pub const fn is_borrowed(&self) -> bool
cow_is_borrowed
)Returns true if the data is borrowed, i.e. if to_mut
would require additional work.
§Examples
#![feature(cow_is_borrowed)]
use std::borrow::Cow;
let cow = Cow::Borrowed("moo");
assert!(cow.is_borrowed());
let bull: Cow<'_, str> = Cow::Owned("...moo?".to_string());
assert!(!bull.is_borrowed());
sourcepub const fn is_owned(&self) -> bool
🔬This is a nightly-only experimental API. (cow_is_borrowed
)
pub const fn is_owned(&self) -> bool
cow_is_borrowed
)Returns true if the data is owned, i.e. if to_mut
would be a no-op.
§Examples
#![feature(cow_is_borrowed)]
use std::borrow::Cow;
let cow: Cow<'_, str> = Cow::Owned("moo".to_string());
assert!(cow.is_owned());
let bull = Cow::Borrowed("...moo?");
assert!(!bull.is_owned());
1.0.0 · sourcepub fn to_mut(&mut self) -> &mut <B as ToOwned>::Owned
pub fn to_mut(&mut self) -> &mut <B as ToOwned>::Owned
Acquires a mutable reference to the owned form of the data.
Clones the data if it is not already owned.
§Examples
use std::borrow::Cow;
let mut cow = Cow::Borrowed("foo");
cow.to_mut().make_ascii_uppercase();
assert_eq!(
cow,
Cow::Owned(String::from("FOO")) as Cow<'_, str>
);
1.0.0 · sourcepub fn into_owned(self) -> <B as ToOwned>::Owned
pub fn into_owned(self) -> <B as ToOwned>::Owned
Extracts the owned data.
Clones the data if it is not already owned.
§Examples
Calling into_owned
on a Cow::Borrowed
returns a clone of the borrowed data:
use std::borrow::Cow;
let s = "Hello world!";
let cow = Cow::Borrowed(s);
assert_eq!(
cow.into_owned(),
String::from(s)
);
Calling into_owned
on a Cow::Owned
returns the owned data. The data is moved out of the
Cow
without being cloned.
use std::borrow::Cow;
let s = "Hello world!";
let cow: Cow<'_, str> = Cow::Owned(String::from(s));
assert_eq!(
cow.into_owned(),
String::from(s)
);
Trait Implementations
1.14.0 · source§impl<'a> AddAssign<&'a str> for Cow<'a, str>
impl<'a> AddAssign<&'a str> for Cow<'a, str>
source§fn add_assign(&mut self, rhs: &'a str)
fn add_assign(&mut self, rhs: &'a str)
+=
operation. Read moresource§impl<'a> Arg for Cow<'a, CStr>
impl<'a> Arg for Cow<'a, CStr>
source§fn to_string_lossy(&self) -> Cow<'_, str>
fn to_string_lossy(&self) -> Cow<'_, str>
Cow<'_, str>
.source§fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
CStr
.source§impl<'a> Arg for Cow<'a, OsStr>
impl<'a> Arg for Cow<'a, OsStr>
source§fn to_string_lossy(&self) -> Cow<'_, str>
fn to_string_lossy(&self) -> Cow<'_, str>
Cow<'_, str>
.source§fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
CStr
.source§impl<'a> Arg for Cow<'a, str>
impl<'a> Arg for Cow<'a, str>
source§fn to_string_lossy(&self) -> Cow<'_, str>
fn to_string_lossy(&self) -> Cow<'_, str>
Cow<'_, str>
.source§fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
CStr
.source§impl<'de, 'a, T> Deserialize<'de> for Cow<'a, T>
impl<'de, 'a, T> Deserialize<'de> for Cow<'a, T>
source§fn deserialize<D>(
deserializer: D,
) -> Result<Cow<'a, T>, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
fn deserialize<D>(
deserializer: D,
) -> Result<Cow<'a, T>, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
source§impl<'a, C, T> FromParallelIterator<T> for Cow<'a, C>
impl<'a, C, T> FromParallelIterator<T> for Cow<'a, C>
Collects an arbitrary Cow
collection.
Note, the standard library only has FromIterator
for Cow<'a, str>
and
Cow<'a, [T]>
, because no one thought to add a blanket implementation
before it was stabilized.
source§fn from_par_iter<I>(par_iter: I) -> Cow<'a, C>where
I: IntoParallelIterator<Item = T>,
fn from_par_iter<I>(par_iter: I) -> Cow<'a, C>where
I: IntoParallelIterator<Item = T>,
par_iter
. Read moresource§impl<'de, 'a, E> IntoDeserializer<'de, E> for Cow<'a, str>where
E: Error,
impl<'de, 'a, E> IntoDeserializer<'de, E> for Cow<'a, str>where
E: Error,
§type Deserializer = CowStrDeserializer<'a, E>
type Deserializer = CowStrDeserializer<'a, E>
source§fn into_deserializer(self) -> CowStrDeserializer<'a, E>
fn into_deserializer(self) -> CowStrDeserializer<'a, E>
1.0.0 · source§impl<B> Ord for Cow<'_, B>
impl<B> Ord for Cow<'_, B>
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
1.8.0 · source§impl<'a, 'b> PartialEq<&'b OsStr> for Cow<'a, OsStr>
impl<'a, 'b> PartialEq<&'b OsStr> for Cow<'a, OsStr>
1.8.0 · source§impl<'a, 'b> PartialEq<&'b OsStr> for Cow<'a, Path>
impl<'a, 'b> PartialEq<&'b OsStr> for Cow<'a, Path>
1.6.0 · source§impl<'a, 'b> PartialEq<&'b Path> for Cow<'a, Path>
impl<'a, 'b> PartialEq<&'b Path> for Cow<'a, Path>
1.8.0 · source§impl<'a, 'b> PartialEq<&'a Path> for Cow<'b, OsStr>
impl<'a, 'b> PartialEq<&'a Path> for Cow<'b, OsStr>
1.0.0 · source§impl<T, U> PartialEq<&mut [U]> for Cow<'_, [T]>
impl<T, U> PartialEq<&mut [U]> for Cow<'_, [T]>
1.0.0 · source§impl<'a, 'b, B, C> PartialEq<Cow<'b, C>> for Cow<'a, B>
impl<'a, 'b, B, C> PartialEq<Cow<'b, C>> for Cow<'a, B>
1.8.0 · source§impl<'a, 'b> PartialEq<OsStr> for Cow<'a, OsStr>
impl<'a, 'b> PartialEq<OsStr> for Cow<'a, OsStr>
1.8.0 · source§impl<'a> PartialEq<OsStr> for Cow<'a, Path>
impl<'a> PartialEq<OsStr> for Cow<'a, Path>
1.8.0 · source§impl<'a, 'b> PartialEq<OsString> for Cow<'a, OsStr>
impl<'a, 'b> PartialEq<OsString> for Cow<'a, OsStr>
1.8.0 · source§impl<'a> PartialEq<OsString> for Cow<'a, Path>
impl<'a> PartialEq<OsString> for Cow<'a, Path>
1.8.0 · source§impl<'a> PartialEq<Path> for Cow<'a, OsStr>
impl<'a> PartialEq<Path> for Cow<'a, OsStr>
1.6.0 · source§impl<'a> PartialEq<Path> for Cow<'a, Path>
impl<'a> PartialEq<Path> for Cow<'a, Path>
1.8.0 · source§impl<'a> PartialEq<PathBuf> for Cow<'a, OsStr>
impl<'a> PartialEq<PathBuf> for Cow<'a, OsStr>
1.6.0 · source§impl<'a> PartialEq<PathBuf> for Cow<'a, Path>
impl<'a> PartialEq<PathBuf> for Cow<'a, Path>
source§impl<T, U, A> PartialEq<Vec<U, A>> for Cow<'_, [T]>
impl<T, U, A> PartialEq<Vec<U, A>> for Cow<'_, [T]>
1.0.0 · source§impl<T, U, A> PartialEq<Vec<U, A>> for Cow<'_, [T]>
impl<T, U, A> PartialEq<Vec<U, A>> for Cow<'_, [T]>
1.8.0 · source§impl<'a, 'b> PartialOrd<&'b OsStr> for Cow<'a, OsStr>
impl<'a, 'b> PartialOrd<&'b OsStr> for Cow<'a, OsStr>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.8.0 · source§impl<'a, 'b> PartialOrd<&'b OsStr> for Cow<'a, Path>
impl<'a, 'b> PartialOrd<&'b OsStr> for Cow<'a, Path>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.8.0 · source§impl<'a, 'b> PartialOrd<&'b Path> for Cow<'a, Path>
impl<'a, 'b> PartialOrd<&'b Path> for Cow<'a, Path>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.8.0 · source§impl<'a, 'b> PartialOrd<&'a Path> for Cow<'b, OsStr>
impl<'a, 'b> PartialOrd<&'a Path> for Cow<'b, OsStr>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.8.0 · source§impl<'a, 'b> PartialOrd<OsStr> for Cow<'a, OsStr>
impl<'a, 'b> PartialOrd<OsStr> for Cow<'a, OsStr>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.8.0 · source§impl<'a> PartialOrd<OsStr> for Cow<'a, Path>
impl<'a> PartialOrd<OsStr> for Cow<'a, Path>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.8.0 · source§impl<'a, 'b> PartialOrd<OsString> for Cow<'a, OsStr>
impl<'a, 'b> PartialOrd<OsString> for Cow<'a, OsStr>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.8.0 · source§impl<'a> PartialOrd<OsString> for Cow<'a, Path>
impl<'a> PartialOrd<OsString> for Cow<'a, Path>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.8.0 · source§impl<'a> PartialOrd<Path> for Cow<'a, OsStr>
impl<'a> PartialOrd<Path> for Cow<'a, OsStr>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.8.0 · source§impl<'a> PartialOrd<Path> for Cow<'a, Path>
impl<'a> PartialOrd<Path> for Cow<'a, Path>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.8.0 · source§impl<'a> PartialOrd<PathBuf> for Cow<'a, OsStr>
impl<'a> PartialOrd<PathBuf> for Cow<'a, OsStr>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.8.0 · source§impl<'a> PartialOrd<PathBuf> for Cow<'a, Path>
impl<'a> PartialOrd<PathBuf> for Cow<'a, Path>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.0.0 · source§impl<'a, B> PartialOrd for Cow<'a, B>
impl<'a, B> PartialOrd for Cow<'a, B>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more