Trait std::clone::Clone

1.0.0 · source ·
pub trait Clone: Sized {
    // Required method
    fn clone(&self) -> Self;

    // Provided method
    fn clone_from(&mut self, source: &Self) { ... }
}
Expand description

A common trait for the ability to explicitly duplicate an object.

Differs from Copy in that Copy is implicit and an inexpensive bit-wise copy, while Clone is always explicit and may or may not be expensive. In order to enforce these characteristics, Rust does not allow you to reimplement Copy, but you may reimplement Clone and run arbitrary code.

Since Clone is more general than Copy, you can automatically make anything Copy be Clone as well.

Derivable

This trait can be used with #[derive] if all fields are Clone. The derived implementation of Clone calls clone on each field.

For a generic struct, #[derive] implements Clone conditionally by adding bound Clone on generic parameters.

// `derive` implements Clone for Reading<T> when T is Clone.
#[derive(Clone)]
struct Reading<T> {
    frequency: T,
}
Run

How can I implement Clone?

Types that are Copy should have a trivial implementation of Clone. More formally: if T: Copy, x: T, and y: &T, then let x = y.clone(); is equivalent to let x = *y;. Manual implementations should be careful to uphold this invariant; however, unsafe code must not rely on it to ensure memory safety.

An example is a generic struct holding a function pointer. In this case, the implementation of Clone cannot be derived, but can be implemented as:

struct Generate<T>(fn() -> T);

impl<T> Copy for Generate<T> {}

impl<T> Clone for Generate<T> {
    fn clone(&self) -> Self {
        *self
    }
}
Run

Additional implementors

In addition to the implementors listed below, the following types also implement Clone:

  • Function item types (i.e., the distinct types defined for each function)
  • Function pointer types (e.g., fn() -> i32)
  • Closure types, if they capture no value from the environment or if all such captured values implement Clone themselves. Note that variables captured by shared reference always implement Clone (even if the referent doesn’t), while variables captured by mutable reference never implement Clone.

Required Methods§

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fn clone(&self) -> Self

Returns a copy of the value.

Examples
let hello = "Hello"; // &str implements Clone

assert_eq!("Hello", hello.clone());
Run

Provided Methods§

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

Performs copy-assignment from source.

a.clone_from(&b) is equivalent to a = b.clone() in functionality, but can be overridden to reuse the resources of a to avoid unnecessary allocations.

Implementors§

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impl Clone for std::cmp::Ordering

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impl Clone for TryReserveErrorKind

1.34.0 (const: unstable) · source§

impl Clone for Infallible

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impl Clone for VarError

1.28.0 · source§

impl Clone for std::fmt::Alignment

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impl Clone for ErrorKind

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impl Clone for SeekFrom

1.7.0 · source§

impl Clone for IpAddr

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impl Clone for Ipv6MulticastScope

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impl Clone for Shutdown

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impl Clone for std::net::SocketAddr

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impl Clone for FpCategory

1.55.0 · source§

impl Clone for IntErrorKind

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impl Clone for BacktraceStyle

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impl Clone for Which

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impl Clone for SearchStep

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impl Clone for std::sync::atomic::Ordering

1.12.0 · source§

impl Clone for RecvTimeoutError

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impl Clone for TryRecvError

const: unstable · source§

impl Clone for bool

const: unstable · source§

impl Clone for char

const: unstable · source§

impl Clone for f32

const: unstable · source§

impl Clone for f64

const: unstable · source§

impl Clone for i8

const: unstable · source§

impl Clone for i16

const: unstable · source§

impl Clone for i32

const: unstable · source§

impl Clone for i64

const: unstable · source§

impl Clone for i128

const: unstable · source§

impl Clone for isize

const: unstable · source§

impl Clone for !

const: unstable · source§

impl Clone for u8

const: unstable · source§

impl Clone for u16

const: unstable · source§

impl Clone for u32

const: unstable · source§

impl Clone for u64

const: unstable · source§

impl Clone for u128

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impl Clone for ()

const: unstable · source§

impl Clone for usize

1.27.0 · source§

impl Clone for CpuidResult

1.27.0 · source§

impl Clone for __m128

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impl Clone for __m128bh

1.27.0 · source§

impl Clone for __m128d

1.27.0 · source§

impl Clone for __m128i

1.27.0 · source§

impl Clone for __m256

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impl Clone for __m256bh

1.27.0 · source§

impl Clone for __m256d

1.27.0 · source§

impl Clone for __m256i

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impl Clone for __m512

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impl Clone for __m512bh

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impl Clone for __m512d

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impl Clone for __m512i

1.69.0 · source§

impl Clone for FromBytesUntilNulError

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impl Clone for TimSortRun

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impl Clone for AllocError

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impl Clone for Global

1.28.0 · source§

impl Clone for Layout

1.50.0 · source§

impl Clone for LayoutError

1.28.0 · source§

impl Clone for System

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impl Clone for TypeId

1.34.0 · source§

impl Clone for TryFromSliceError

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impl Clone for std::ascii::EscapeDefault

1.3.0 · source§

impl Clone for Box<str, Global>

1.29.0 · source§

impl Clone for Box<CStr, Global>

1.29.0 · source§

impl Clone for Box<OsStr>

1.29.0 · source§

impl Clone for Box<Path>

1.34.0 · source§

impl Clone for CharTryFromError

1.9.0 · source§

impl Clone for DecodeUtf16Error

1.20.0 · source§

impl Clone for std::char::EscapeDebug

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impl Clone for std::char::EscapeDefault

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impl Clone for std::char::EscapeUnicode

1.20.0 · source§

impl Clone for ParseCharError

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impl Clone for ToLowercase

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impl Clone for ToUppercase

1.59.0 · source§

impl Clone for TryFromCharError

1.13.0 · source§

impl Clone for DefaultHasher

1.7.0 · source§

impl Clone for RandomState

1.57.0 · source§

impl Clone for TryReserveError

1.64.0 · source§

impl Clone for CString

1.64.0 · source§

impl Clone for FromBytesWithNulError

1.64.0 · source§

impl Clone for FromVecWithNulError

1.64.0 · source§

impl Clone for IntoStringError

1.64.0 · source§

impl Clone for NulError

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impl Clone for OsString

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impl Clone for Error

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impl Clone for FileTimes

1.1.0 · source§

impl Clone for FileType

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impl Clone for Metadata

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impl Clone for OpenOptions

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impl Clone for Permissions

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impl Clone for SipHasher

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impl Clone for std::io::Empty

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impl Clone for Sink

1.33.0 · source§

impl Clone for PhantomPinned

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impl Clone for Assume

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impl Clone for AddrParseError

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impl Clone for Ipv4Addr

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impl Clone for Ipv6Addr

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impl Clone for SocketAddrV4

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impl Clone for SocketAddrV6

1.34.0 · source§

impl Clone for NonZeroI8

1.34.0 · source§

impl Clone for NonZeroI16

1.34.0 · source§

impl Clone for NonZeroI32

1.34.0 · source§

impl Clone for NonZeroI64

1.34.0 · source§

impl Clone for NonZeroI128

1.34.0 · source§

impl Clone for NonZeroIsize

1.28.0 · source§

impl Clone for NonZeroU8

1.28.0 · source§

impl Clone for NonZeroU16

1.28.0 · source§

impl Clone for NonZeroU32

1.28.0 · source§

impl Clone for NonZeroU64

1.28.0 · source§

impl Clone for NonZeroU128

1.28.0 · source§

impl Clone for NonZeroUsize

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impl Clone for ParseFloatError

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impl Clone for ParseIntError

1.34.0 · source§

impl Clone for TryFromIntError

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impl Clone for RangeFull

1.1.0 · source§

impl Clone for stat

Available on Linux only.
1.10.0 · source§

impl Clone for std::os::unix::net::SocketAddr

Available on Unix only.
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impl Clone for SocketCred

Available on (Android or Linux) and Unix only.
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impl Clone for UCred

Available on Unix only.
1.63.0 · source§

impl Clone for InvalidHandleError

Available on Windows only.
1.63.0 · source§

impl Clone for NullHandleError

Available on Windows only.
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impl Clone for PathBuf

1.7.0 · source§

impl Clone for StripPrefixError

1.61.0 · source§

impl Clone for ExitCode

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impl Clone for ExitStatus

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impl Clone for ExitStatusError

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impl Clone for Output

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impl Clone for std::ptr::Alignment

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impl Clone for ParseBoolError

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impl Clone for Utf8Error

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impl Clone for FromUtf8Error

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impl Clone for String

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impl Clone for RecvError

1.5.0 · source§

impl Clone for WaitTimeoutResult

1.36.0 · source§

impl Clone for RawWakerVTable

1.36.0 · source§

impl Clone for Waker

1.26.0 · source§

impl Clone for AccessError

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impl Clone for Thread

1.19.0 · source§

impl Clone for ThreadId

1.3.0 · source§

impl Clone for Duration

1.8.0 · source§

impl Clone for Instant

1.8.0 · source§

impl Clone for SystemTime

1.8.0 · source§

impl Clone for SystemTimeError

1.66.0 · source§

impl Clone for TryFromFloatSecsError

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impl<'a> Clone for Component<'a>

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impl<'a> Clone for Prefix<'a>

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impl<'a> Clone for Source<'a>

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impl<'a> Clone for Arguments<'a>

1.36.0 · source§

impl<'a> Clone for IoSlice<'a>

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impl<'a> Clone for EncodeWide<'a>

1.10.0 · source§

impl<'a> Clone for Location<'a>

1.28.0 · source§

impl<'a> Clone for Ancestors<'a>

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impl<'a> Clone for Components<'a>

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impl<'a> Clone for std::path::Iter<'a>

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impl<'a> Clone for PrefixComponent<'a>

1.60.0 · source§

impl<'a> Clone for EscapeAscii<'a>

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impl<'a> Clone for CharSearcher<'a>

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impl<'a> Clone for Bytes<'a>

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impl<'a> Clone for CharIndices<'a>

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impl<'a> Clone for Chars<'a>

1.8.0 · source§

impl<'a> Clone for EncodeUtf16<'a>

1.34.0 · source§

impl<'a> Clone for std::str::EscapeDebug<'a>

1.34.0 · source§

impl<'a> Clone for std::str::EscapeDefault<'a>

1.34.0 · source§

impl<'a> Clone for std::str::EscapeUnicode<'a>

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impl<'a> Clone for Lines<'a>

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impl<'a> Clone for LinesAny<'a>

1.34.0 · source§

impl<'a> Clone for SplitAsciiWhitespace<'a>

1.1.0 · source§

impl<'a> Clone for SplitWhitespace<'a>

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impl<'a> Clone for Utf8Chunk<'a>

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impl<'a> Clone for Utf8Chunks<'a>

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impl<'a, 'b> Clone for CharSliceSearcher<'a, 'b>

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impl<'a, 'b> Clone for StrSearcher<'a, 'b>

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impl<'a, 'b, const N: usize> Clone for CharArrayRefSearcher<'a, 'b, N>

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impl<'a, F> Clone for CharPredicateSearcher<'a, F>where F: Clone + FnMut(char) -> bool,

1.5.0 · source§

impl<'a, P> Clone for MatchIndices<'a, P>where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: Clone,

1.2.0 · source§

impl<'a, P> Clone for Matches<'a, P>where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: Clone,

1.5.0 · source§

impl<'a, P> Clone for RMatchIndices<'a, P>where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: Clone,

1.2.0 · source§

impl<'a, P> Clone for RMatches<'a, P>where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: Clone,

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impl<'a, P> Clone for std::str::RSplit<'a, P>where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: Clone,

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impl<'a, P> Clone for RSplitN<'a, P>where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: Clone,

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impl<'a, P> Clone for RSplitTerminator<'a, P>where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: Clone,

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impl<'a, P> Clone for std::str::Split<'a, P>where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: Clone,

1.51.0 · source§

impl<'a, P> Clone for std::str::SplitInclusive<'a, P>where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: Clone,

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impl<'a, P> Clone for SplitN<'a, P>where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: Clone,

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impl<'a, P> Clone for SplitTerminator<'a, P>where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: Clone,

1.31.0 · source§

impl<'a, T> Clone for RChunksExact<'a, T>

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impl<'a, T, const N: usize> Clone for ArrayWindows<'a, T, N>where T: Clone + 'a,

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impl<'a, const N: usize> Clone for CharArraySearcher<'a, N>

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impl<'f> Clone for VaListImpl<'f>

1.63.0 · source§

impl<'fd> Clone for BorrowedFd<'fd>

1.63.0 · source§

impl<'handle> Clone for BorrowedHandle<'handle>

Available on Windows only.
1.63.0 · source§

impl<'socket> Clone for BorrowedSocket<'socket>

Available on Windows only.
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impl<A> Clone for Repeat<A>where A: Clone,

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impl<A> Clone for std::option::IntoIter<A>where A: Clone,

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impl<A> Clone for std::option::Iter<'_, A>

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impl<A, B> Clone for Chain<A, B>where A: Clone, B: Clone,

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impl<A, B> Clone for Zip<A, B>where A: Clone, B: Clone,

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impl<B> Clone for Cow<'_, B>where B: ToOwned + ?Sized,

1.55.0 · source§

impl<B, C> Clone for ControlFlow<B, C>where B: Clone, C: Clone,

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impl<Dyn> Clone for DynMetadata<Dyn>where Dyn: ?Sized,

1.34.0 · source§

impl<F> Clone for FromFn<F>where F: Clone,

1.43.0 · source§

impl<F> Clone for OnceWith<F>where F: Clone,

1.28.0 · source§

impl<F> Clone for RepeatWith<F>where F: Clone,

1.7.0 · source§

impl<H> Clone for BuildHasherDefault<H>

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impl<I> Clone for FromIter<I>where I: Clone,

1.9.0 · source§

impl<I> Clone for DecodeUtf16<I>where I: Clone + Iterator<Item = u16>,

1.1.0 · source§

impl<I> Clone for Cloned<I>where I: Clone,

1.36.0 · source§

impl<I> Clone for Copied<I>where I: Clone,

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impl<I> Clone for Cycle<I>where I: Clone,

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impl<I> Clone for Enumerate<I>where I: Clone,

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impl<I> Clone for Fuse<I>where I: Clone,

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impl<I> Clone for Intersperse<I>where I: Clone + Iterator, <I as Iterator>::Item: Clone,

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impl<I> Clone for Peekable<I>where I: Clone + Iterator, <I as Iterator>::Item: Clone,

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impl<I> Clone for Skip<I>where I: Clone,

1.28.0 · source§

impl<I> Clone for StepBy<I>where I: Clone,

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impl<I> Clone for Take<I>where I: Clone,

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impl<I, F> Clone for FilterMap<I, F>where I: Clone, F: Clone,

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impl<I, F> Clone for Inspect<I, F>where I: Clone, F: Clone,

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impl<I, F> Clone for Map<I, F>where I: Clone, F: Clone,

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impl<I, G> Clone for IntersperseWith<I, G>where I: Iterator + Clone, <I as Iterator>::Item: Clone, G: Clone,

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impl<I, P> Clone for Filter<I, P>where I: Clone, P: Clone,

1.57.0 · source§

impl<I, P> Clone for MapWhile<I, P>where I: Clone, P: Clone,

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impl<I, P> Clone for SkipWhile<I, P>where I: Clone, P: Clone,

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impl<I, P> Clone for TakeWhile<I, P>where I: Clone, P: Clone,

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impl<I, St, F> Clone for Scan<I, St, F>where I: Clone, St: Clone, F: Clone,

1.29.0 · source§

impl<I, U> Clone for Flatten<I>where I: Clone + Iterator, <I as Iterator>::Item: IntoIterator<IntoIter = U, Item = <U as Iterator>::Item>, U: Clone + Iterator,

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impl<I, U, F> Clone for FlatMap<I, U, F>where I: Clone, F: Clone, U: Clone + IntoIterator, <U as IntoIterator>::IntoIter: Clone,

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impl<I, const N: usize> Clone for std::iter::ArrayChunks<I, N>where I: Clone + Iterator, <I as Iterator>::Item: Clone,

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impl<Idx> Clone for std::ops::Range<Idx>where Idx: Clone,

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impl<Idx> Clone for RangeFrom<Idx>where Idx: Clone,

1.26.0 · source§

impl<Idx> Clone for RangeInclusive<Idx>where Idx: Clone,

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impl<Idx> Clone for RangeTo<Idx>where Idx: Clone,

1.26.0 · source§

impl<Idx> Clone for RangeToInclusive<Idx>where Idx: Clone,

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impl<K> Clone for std::collections::hash_set::Iter<'_, K>

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impl<K, V> Clone for std::collections::btree_map::Cursor<'_, K, V>

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impl<K, V> Clone for std::collections::btree_map::Iter<'_, K, V>

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impl<K, V> Clone for std::collections::btree_map::Keys<'_, K, V>

1.17.0 · source§

impl<K, V> Clone for std::collections::btree_map::Range<'_, K, V>

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impl<K, V> Clone for std::collections::btree_map::Values<'_, K, V>

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impl<K, V> Clone for std::collections::hash_map::Iter<'_, K, V>

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impl<K, V> Clone for std::collections::hash_map::Keys<'_, K, V>

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impl<K, V> Clone for std::collections::hash_map::Values<'_, K, V>

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impl<K, V, A> Clone for BTreeMap<K, V, A>where K: Clone, V: Clone, A: Allocator + Clone,

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impl<K, V, S> Clone for HashMap<K, V, S>where K: Clone, V: Clone, S: Clone,

1.33.0 · source§

impl<P> Clone for Pin<P>where P: Clone,

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impl<Ret, T> Clone for fn (T₁, T₂, …, Tₙ) -> Ret

This trait is implemented on function pointers with any number of arguments.

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impl<T> !Clone for &mut Twhere T: ?Sized,

Shared references can be cloned, but mutable references cannot!

1.17.0 · source§

impl<T> Clone for Bound<T>where T: Clone,

const: unstable · source§

impl<T> Clone for Option<T>where T: Clone,

1.36.0 · source§

impl<T> Clone for Poll<T>where T: Clone,

const: unstable · source§

impl<T> Clone for *const Twhere T: ?Sized,

const: unstable · source§

impl<T> Clone for *mut Twhere T: ?Sized,

const: unstable · source§

impl<T> Clone for &Twhere T: ?Sized,

Shared references can be cloned, but mutable references cannot!

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impl<T> Clone for Cell<T>where T: Copy,

1.70.0 · source§

impl<T> Clone for OnceCell<T>where T: Clone,

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impl<T> Clone for RefCell<T>where T: Clone,

1.19.0 · source§

impl<T> Clone for Reverse<T>where T: Clone,

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impl<T> Clone for std::collections::binary_heap::IntoIter<T>where T: Clone,

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impl<T> Clone for IntoIterSorted<T>where T: Clone,

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impl<T> Clone for std::collections::binary_heap::Iter<'_, T>

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impl<T> Clone for std::collections::btree_set::Iter<'_, T>

1.17.0 · source§

impl<T> Clone for std::collections::btree_set::Range<'_, T>

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impl<T> Clone for std::collections::btree_set::SymmetricDifference<'_, T>

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impl<T> Clone for std::collections::btree_set::Union<'_, T>

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impl<T> Clone for std::collections::linked_list::Cursor<'_, T>

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impl<T> Clone for std::collections::linked_list::IntoIter<T>where T: Clone,

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impl<T> Clone for std::collections::linked_list::Iter<'_, T>

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impl<T> Clone for BinaryHeap<T>where T: Clone,

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impl<T> Clone for LinkedList<T>where T: Clone,

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impl<T> Clone for std::collections::vec_deque::Iter<'_, T>

1.48.0 · source§

impl<T> Clone for Pending<T>

1.48.0 · source§

impl<T> Clone for Ready<T>where T: Clone,

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impl<T> Clone for std::io::Cursor<T>where T: Clone,

1.2.0 · source§

impl<T> Clone for std::iter::Empty<T>

1.2.0 · source§

impl<T> Clone for Once<T>where T: Clone,

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impl<T> Clone for Rev<T>where T: Clone,

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impl<T> Clone for PhantomData<T>where T: ?Sized,

1.21.0 · source§

impl<T> Clone for Discriminant<T>

1.20.0 · source§

impl<T> Clone for ManuallyDrop<T>where T: Clone + ?Sized,

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impl<T> Clone for Saturating<T>where T: Clone,

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impl<T> Clone for Wrapping<T>where T: Clone,

1.25.0 (const: unstable) · source§

impl<T> Clone for NonNull<T>where T: ?Sized,

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impl<T> Clone for Rc<T>where T: ?Sized,

1.4.0 · source§

impl<T> Clone for std::rc::Weak<T>where T: ?Sized,

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impl<T> Clone for std::result::IntoIter<T>where T: Clone,

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impl<T> Clone for std::result::Iter<'_, T>

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impl<T> Clone for Chunks<'_, T>

1.31.0 · source§

impl<T> Clone for ChunksExact<'_, T>

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impl<T> Clone for std::slice::Iter<'_, T>

1.31.0 · source§

impl<T> Clone for RChunks<'_, T>

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impl<T> Clone for Windows<'_, T>

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impl<T> Clone for Sender<T>

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impl<T> Clone for SyncSender<T>

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impl<T> Clone for Arc<T>where T: ?Sized,

1.4.0 · source§

impl<T> Clone for std::sync::Weak<T>where T: ?Sized,

1.36.0 · source§

impl<T> Clone for MaybeUninit<T>where T: Copy,

1.3.0 · source§

impl<T, A> Clone for Box<[T], A>where T: Clone, A: Allocator + Clone,

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impl<T, A> Clone for Box<T, A>where T: Clone, A: Allocator + Clone,

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impl<T, A> Clone for std::collections::btree_set::Difference<'_, T, A>where A: Allocator + Clone,

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impl<T, A> Clone for std::collections::btree_set::Intersection<'_, T, A>where A: Allocator + Clone,

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impl<T, A> Clone for BTreeSet<T, A>where T: Clone, A: Allocator + Clone,

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impl<T, A> Clone for VecDeque<T, A>where T: Clone, A: Allocator + Clone,

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impl<T, A> Clone for std::collections::vec_deque::IntoIter<T, A>where T: Clone, A: Clone + Allocator,

1.8.0 · source§

impl<T, A> Clone for std::vec::IntoIter<T, A>where T: Clone, A: Allocator + Clone,

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impl<T, A> Clone for Vec<T, A>where T: Clone, A: Allocator + Clone,

const: unstable · source§

impl<T, E> Clone for Result<T, E>where T: Clone, E: Clone,

1.34.0 · source§

impl<T, F> Clone for Successors<T, F>where T: Clone, F: Clone,

1.27.0 · source§

impl<T, P> Clone for std::slice::RSplit<'_, T, P>where P: Clone + FnMut(&T) -> bool,

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impl<T, P> Clone for std::slice::Split<'_, T, P>where P: Clone + FnMut(&T) -> bool,

1.51.0 · source§

impl<T, P> Clone for std::slice::SplitInclusive<'_, T, P>where P: Clone + FnMut(&T) -> bool,

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impl<T, S> Clone for std::collections::hash_set::Difference<'_, T, S>

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impl<T, S> Clone for HashSet<T, S>where T: Clone, S: Clone,

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impl<T, S> Clone for std::collections::hash_set::Intersection<'_, T, S>

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impl<T, S> Clone for std::collections::hash_set::SymmetricDifference<'_, T, S>

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impl<T, S> Clone for std::collections::hash_set::Union<'_, T, S>

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impl<T, const LANES: usize> Clone for Mask<T, LANES>where T: MaskElement, LaneCount<LANES>: SupportedLaneCount,

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impl<T, const LANES: usize> Clone for Simd<T, LANES>where T: SimdElement, LaneCount<LANES>: SupportedLaneCount,

1.58.0 · source§

impl<T, const N: usize> Clone for [T; N]where T: Clone,

1.40.0 · source§

impl<T, const N: usize> Clone for std::array::IntoIter<T, N>where T: Clone,

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impl<T, const N: usize> Clone for std::slice::ArrayChunks<'_, T, N>

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impl<T: Clone> Clone for TrySendError<T>

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impl<T: Clone> Clone for (T₁, T₂, …, Tₙ)

This trait is implemented on arbitrary-length tuples.

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impl<T: Clone> Clone for SendError<T>

1.70.0 · source§

impl<T: Clone> Clone for OnceLock<T>

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impl<Y, R> Clone for GeneratorState<Y, R>where Y: Clone, R: Clone,