Enum tor_hsservice::internal_prelude::Cow
1.0.0 · source · pub(crate) enum Cow<'a, B>{
Borrowed(&'a B),
Owned(<B as ToOwned>::Owned),
}
Expand description
A clone-on-write smart pointer.
The type Cow
is a smart pointer providing clone-on-write functionality: it
can enclose and provide immutable access to borrowed data, and clone the
data lazily when mutation or ownership is required. The type is designed to
work with general borrowed data via the Borrow
trait.
Cow
implements Deref
, which means that you can call
non-mutating methods directly on the data it encloses. If mutation
is desired, to_mut
will obtain a mutable reference to an owned
value, cloning if necessary.
If you need reference-counting pointers, note that
Rc::make_mut
and
Arc::make_mut
can provide clone-on-write
functionality as well.
§Examples
use std::borrow::Cow;
fn abs_all(input: &mut Cow<'_, [i32]>) {
for i in 0..input.len() {
let v = input[i];
if v < 0 {
// Clones into a vector if not already owned.
input.to_mut()[i] = -v;
}
}
}
// No clone occurs because `input` doesn't need to be mutated.
let slice = [0, 1, 2];
let mut input = Cow::from(&slice[..]);
abs_all(&mut input);
// Clone occurs because `input` needs to be mutated.
let slice = [-1, 0, 1];
let mut input = Cow::from(&slice[..]);
abs_all(&mut input);
// No clone occurs because `input` is already owned.
let mut input = Cow::from(vec![-1, 0, 1]);
abs_all(&mut input);
Another example showing how to keep Cow
in a struct:
use std::borrow::Cow;
struct Items<'a, X> where [X]: ToOwned<Owned = Vec<X>> {
values: Cow<'a, [X]>,
}
impl<'a, X: Clone + 'a> Items<'a, X> where [X]: ToOwned<Owned = Vec<X>> {
fn new(v: Cow<'a, [X]>) -> Self {
Items { values: v }
}
}
// Creates a container from borrowed values of a slice
let readonly = [1, 2];
let borrowed = Items::new((&readonly[..]).into());
match borrowed {
Items { values: Cow::Borrowed(b) } => println!("borrowed {b:?}"),
_ => panic!("expect borrowed value"),
}
let mut clone_on_write = borrowed;
// Mutates the data from slice into owned vec and pushes a new value on top
clone_on_write.values.to_mut().push(3);
println!("clone_on_write = {:?}", clone_on_write.values);
// The data was mutated. Let's check it out.
match clone_on_write {
Items { values: Cow::Owned(_) } => println!("clone_on_write contains owned data"),
_ => panic!("expect owned data"),
}
Variants§
Implementations§
source§impl<B> Cow<'_, B>
impl<B> Cow<'_, B>
const: unstable · sourcepub fn is_borrowed(&self) -> bool
🔬This is a nightly-only experimental API. (cow_is_borrowed
)
pub 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());
const: unstable · sourcepub fn is_owned(&self) -> bool
🔬This is a nightly-only experimental API. (cow_is_borrowed
)
pub 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>
Available on non-no_global_oom_handling
only.
impl<'a> AddAssign<&'a str> for Cow<'a, str>
no_global_oom_handling
only.source§fn add_assign(&mut self, rhs: &'a str)
fn add_assign(&mut self, rhs: &'a str)
+=
operation. Read more§impl<'a, A> Arbitrary<'a> for Cow<'a, A>
impl<'a, A> Arbitrary<'a> for Cow<'a, A>
§fn arbitrary(u: &mut Unstructured<'a>) -> Result<Cow<'a, A>, Error>
fn arbitrary(u: &mut Unstructured<'a>) -> Result<Cow<'a, A>, Error>
Self
from the given unstructured data. Read more§fn size_hint(depth: usize) -> (usize, Option<usize>)
fn size_hint(depth: usize) -> (usize, Option<usize>)
Unstructured
this type
needs to construct itself. Read more§fn arbitrary_take_rest(u: Unstructured<'a>) -> Result<Self, Error>
fn arbitrary_take_rest(u: Unstructured<'a>) -> Result<Self, Error>
Self
from the entirety of the given
unstructured data. Read more§impl<'a> Arg for Cow<'a, CStr>
impl<'a> Arg for Cow<'a, CStr>
§fn to_string_lossy(&self) -> Cow<'_, str>
fn to_string_lossy(&self) -> Cow<'_, str>
Cow<'_, str>
.§fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
CStr
.§impl<'a> Arg for Cow<'a, CStr>
Available on crate feature alloc
only.
impl<'a> Arg for Cow<'a, CStr>
alloc
only.§fn to_string_lossy(&self) -> Cow<'_, str>
fn to_string_lossy(&self) -> Cow<'_, str>
Cow<'_, str>
.§fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
CStr
.§impl<'a> Arg for Cow<'a, OsStr>
Available on crate feature std
only.
impl<'a> Arg for Cow<'a, OsStr>
std
only.§fn to_string_lossy(&self) -> Cow<'_, str>
fn to_string_lossy(&self) -> Cow<'_, str>
Cow<'_, str>
.§fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
CStr
.§impl<'a> Arg for Cow<'a, OsStr>
Available on crate features std
and alloc
only.
impl<'a> Arg for Cow<'a, OsStr>
std
and alloc
only.§fn to_string_lossy(&self) -> Cow<'_, str>
fn to_string_lossy(&self) -> Cow<'_, str>
Cow<'_, str>
.§fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
CStr
.§impl<'a> Arg for Cow<'a, str>
impl<'a> Arg for Cow<'a, str>
§fn to_string_lossy(&self) -> Cow<'_, str>
fn to_string_lossy(&self) -> Cow<'_, str>
Cow<'_, str>
.§fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
fn as_cow_c_str(&self) -> Result<Cow<'_, CStr>, Errno>
CStr
.§impl<'a> Arg for Cow<'a, str>
Available on crate feature alloc
only.
impl<'a> Arg for Cow<'a, str>
alloc
only.§fn to_string_lossy(&self) -> Cow<'_, str>
fn to_string_lossy(&self) -> Cow<'_, str>
Cow<'_, str>
.§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> Deserialize<'de> for Cow<'a, [u8]>where
'de: 'a,
Available on crate features std
or alloc
only.
impl<'de, 'a> Deserialize<'de> for Cow<'a, [u8]>where
'de: 'a,
std
or alloc
only.fn deserialize<D>(
deserializer: D
) -> Result<Cow<'a, [u8]>, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
source§impl<'de, 'a> Deserialize<'de> for Cow<'a, Bytes>where
'de: 'a,
Available on crate features std
or alloc
only.
impl<'de, 'a> Deserialize<'de> for Cow<'a, Bytes>where
'de: 'a,
std
or alloc
only.fn deserialize<D>(
deserializer: D
) -> Result<Cow<'a, Bytes>, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
source§impl<'de, 'a, T> Deserialize<'de> for Cow<'a, T>
Available on crate features std
or alloc
only.
impl<'de, 'a, T> Deserialize<'de> for Cow<'a, T>
std
or alloc
only.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>,
1.52.0 · source§impl<'a> Extend<Cow<'a, OsStr>> for OsString
impl<'a> Extend<Cow<'a, OsStr>> for OsString
source§fn extend<T>(&mut self, iter: T)
fn extend<T>(&mut self, iter: T)
source§fn extend_one(&mut self, item: A)
fn extend_one(&mut self, item: A)
extend_one
)source§fn extend_reserve(&mut self, additional: usize)
fn extend_reserve(&mut self, additional: usize)
extend_one
)1.19.0 · source§impl<'a> Extend<Cow<'a, str>> for String
Available on non-no_global_oom_handling
only.
impl<'a> Extend<Cow<'a, str>> for String
no_global_oom_handling
only.source§fn extend<I>(&mut self, iter: I)
fn extend<I>(&mut self, iter: I)
source§fn extend_one(&mut self, s: Cow<'a, str>)
fn extend_one(&mut self, s: Cow<'a, str>)
extend_one
)source§fn extend_reserve(&mut self, additional: usize)
fn extend_reserve(&mut self, additional: usize)
extend_one
)1.28.0 · source§impl<'a> From<&'a String> for Cow<'a, str>
Available on non-no_global_oom_handling
only.
impl<'a> From<&'a String> for Cow<'a, str>
no_global_oom_handling
only.1.14.0 · source§impl<'a, T> From<Cow<'a, [T]>> for Vec<T>
impl<'a, T> From<Cow<'a, [T]>> for Vec<T>
source§fn from(s: Cow<'a, [T]>) -> Vec<T>
fn from(s: Cow<'a, [T]>) -> Vec<T>
Convert a clone-on-write slice into a vector.
If s
already owns a Vec<T>
, it will be returned directly.
If s
is borrowing a slice, a new Vec<T>
will be allocated and
filled by cloning s
’s items into it.
§Examples
let o: Cow<'_, [i32]> = Cow::Owned(vec![1, 2, 3]);
let b: Cow<'_, [i32]> = Cow::Borrowed(&[1, 2, 3]);
assert_eq!(Vec::from(o), Vec::from(b));
1.14.0 · source§impl<'a> From<Cow<'a, str>> for String
Available on non-no_global_oom_handling
only.
impl<'a> From<Cow<'a, str>> for String
no_global_oom_handling
only.source§fn from(s: Cow<'a, str>) -> String
fn from(s: Cow<'a, str>) -> String
Converts a clone-on-write string to an owned
instance of String
.
This extracts the owned string, clones the string if it is not already owned.
§Example
// If the string is not owned...
let cow: Cow<'_, str> = Cow::Borrowed("eggplant");
// It will allocate on the heap and copy the string.
let owned: String = String::from(cow);
assert_eq!(&owned[..], "eggplant");
1.12.0 · source§impl<'a, 'b> FromIterator<&'b str> for Cow<'a, str>
Available on non-no_global_oom_handling
only.
impl<'a, 'b> FromIterator<&'b str> for Cow<'a, str>
no_global_oom_handling
only.1.80.0 · source§impl<'a> FromIterator<Cow<'a, str>> for Box<str>
Available on non-no_global_oom_handling
only.
impl<'a> FromIterator<Cow<'a, str>> for Box<str>
no_global_oom_handling
only.1.19.0 · source§impl<'a> FromIterator<Cow<'a, str>> for String
Available on non-no_global_oom_handling
only.
impl<'a> FromIterator<Cow<'a, str>> for String
no_global_oom_handling
only.1.12.0 · source§impl<'a> FromIterator<String> for Cow<'a, str>
Available on non-no_global_oom_handling
only.
impl<'a> FromIterator<String> for Cow<'a, str>
no_global_oom_handling
only.1.12.0 · source§impl<'a> FromIterator<char> for Cow<'a, str>
Available on non-no_global_oom_handling
only.
impl<'a> FromIterator<char> for Cow<'a, str>
no_global_oom_handling
only.§impl<'a, B> IntoAsciiString for Cow<'a, B>
impl<'a, B> IntoAsciiString for Cow<'a, B>
§unsafe fn into_ascii_string_unchecked(self) -> AsciiString
unsafe fn into_ascii_string_unchecked(self) -> AsciiString
AsciiString
without checking for non-ASCII characters. Read more§fn into_ascii_string(self) -> Result<AsciiString, FromAsciiError<Cow<'a, B>>>
fn into_ascii_string(self) -> Result<AsciiString, FromAsciiError<Cow<'a, B>>>
AsciiString
. Read moresource§impl<'de, 'a, E> IntoDeserializer<'de, E> for Cow<'a, str>where
E: Error,
Available on crate features std
or alloc
only.
impl<'de, 'a, E> IntoDeserializer<'de, E> for Cow<'a, str>where
E: Error,
std
or alloc
only.§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]>
1.8.0 · source§impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for &'b OsStr
impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for &'b OsStr
1.8.0 · source§impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for OsStr
impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for OsStr
1.8.0 · source§impl<'a> PartialEq<Cow<'a, OsStr>> for Path
impl<'a> PartialEq<Cow<'a, OsStr>> for Path
§impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for Path
impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for Path
1.8.0 · source§impl<'a> PartialEq<Cow<'a, OsStr>> for PathBuf
impl<'a> PartialEq<Cow<'a, OsStr>> for PathBuf
1.8.0 · source§impl<'a, 'b> PartialEq<Cow<'a, Path>> for &'b OsStr
impl<'a, 'b> PartialEq<Cow<'a, Path>> for &'b OsStr
1.6.0 · source§impl<'a, 'b> PartialEq<Cow<'a, Path>> for &'b Path
impl<'a, 'b> PartialEq<Cow<'a, Path>> for &'b Path
§impl<'a, 'b> PartialEq<Cow<'a, Path>> for &'b Path
impl<'a, 'b> PartialEq<Cow<'a, Path>> for &'b Path
1.8.0 · source§impl<'a> PartialEq<Cow<'a, Path>> for OsStr
impl<'a> PartialEq<Cow<'a, Path>> for OsStr
1.6.0 · source§impl<'a> PartialEq<Cow<'a, Path>> for Path
impl<'a> PartialEq<Cow<'a, Path>> for Path
§impl<'a, 'b> PartialEq<Cow<'a, Path>> for Path
impl<'a, 'b> PartialEq<Cow<'a, Path>> for Path
1.6.0 · source§impl<'a> PartialEq<Cow<'a, Path>> for PathBuf
impl<'a> PartialEq<Cow<'a, Path>> for PathBuf
1.0.0 · source§impl<'a, 'b> PartialEq<Cow<'a, str>> for &'b str
impl<'a, 'b> PartialEq<Cow<'a, str>> for &'b str
1.0.0 · source§impl<'a, 'b> PartialEq<Cow<'a, str>> for String
impl<'a, 'b> PartialEq<Cow<'a, str>> for String
1.0.0 · source§impl<'a, 'b> PartialEq<Cow<'a, str>> for str
impl<'a, 'b> PartialEq<Cow<'a, str>> for str
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<Cow<'b, OsStr>> for &'a Path
impl<'a, 'b> PartialEq<Cow<'b, OsStr>> for &'a Path
§impl<'a, 'b> PartialEq<Cow<'b, OsStr>> for &'a Path
impl<'a, 'b> PartialEq<Cow<'b, OsStr>> for &'a Path
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>
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 more§impl<'a, 'b> PartialOrd<&'b Path> for Cow<'a, Path>
impl<'a, 'b> PartialOrd<&'b Path> for Cow<'a, Path>
§fn partial_cmp(&self, other: &&'b Path) -> Option<Ordering>
fn partial_cmp(&self, other: &&'b Path) -> Option<Ordering>
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 more§impl<'a, 'b> PartialOrd<&'a Path> for Cow<'b, OsStr>
impl<'a, 'b> PartialOrd<&'a Path> for Cow<'b, OsStr>
§fn partial_cmp(&self, other: &&'a Path) -> Option<Ordering>
fn partial_cmp(&self, other: &&'a Path) -> Option<Ordering>
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<Cow<'a, OsStr>> for &'b OsStr
impl<'a, 'b> PartialOrd<Cow<'a, OsStr>> for &'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<Cow<'a, OsStr>> for OsStr
impl<'a, 'b> PartialOrd<Cow<'a, OsStr>> for 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<Cow<'a, OsStr>> for Path
impl<'a> PartialOrd<Cow<'a, OsStr>> for Path
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
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