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

通用的 trait,用于显式复制对象。

Copy 的不同之处在于 Copy 是隐式的并且是廉价的按位复制,而 Clone 始终是显式的并且可能昂贵也可能不昂贵。 为了强制执行这些特性,Rust 不允许您重新实现 Copy,但是您可以重新实现 Clone 并运行任意代码。

由于 CloneCopy 更通用,因此您可以自动将 Copy 设为 Clone

Derivable

如果所有字段均为 Clone,则此 trait 可以与 #[derive] 一起使用。Clonederived 实现在每个字段上调用 clone

对于泛型结构体,#[derive] 通过在泛型参数上添加绑定的 Clone 有条件地实现 Clone

// 当 T 是 Clone 时,`derive` 为 Reading<T> 实现了 Clone。
#[derive(Clone)]
struct Reading<T> {
    frequency: T,
}
Run

如何实现 Clone

Copy 类型应该实现 Clone 的简单实现。更正式地: 如果 T: Copyx: Ty: &T,则 let x = y.clone(); 等效于 let x = *y;。 手动执行时应注意保持不变。但是,不安全的代码一定不能依靠它来确保内存安全。

一个示例是持有函数指针的泛型结构体。在这种情况下,不能对 Clone 的实现进行派生操作,而可以将其实现为:

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

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

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

其他实现者

除了下面列出的 实现者 外,以下类型还实现了 Clone

  • 函数项类型 (即,为每个函数定义的不同类型)
  • 函数指针类型 (例如 fn() -> i32)
  • 闭包类型,如果它们没有从环境中捕获任何值,或者所有此类捕获的值本身都实现了 Clone。 请注意,由共享引用捕获的变量始终实现 Clone (即使引用对象没有实现),而由变量引用捕获的变量从不实现 Clone

Required Methods§

source

fn clone(&self) -> Self

返回值的副本。

Examples
let hello = "Hello"; // &str 实现克隆

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

Provided Methods§

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

source 执行复制分配。

a.clone_from(&b) 在功能上等同于 a = b.clone(),但可以被覆盖以重用 a 的资源以避免不必要的分配。

Implementors§

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impl Clone for AsciiChar

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impl Clone for std::cmp::Ordering

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impl Clone for TryReserveErrorKind

1.34.0 · 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

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impl Clone for bool

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impl Clone for char

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impl Clone for f32

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impl Clone for f64

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impl Clone for i8

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impl Clone for i16

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impl Clone for i32

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impl Clone for i64

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impl Clone for i128

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impl Clone for isize

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impl Clone for !

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impl Clone for u8

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impl Clone for u16

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impl Clone for u32

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impl Clone for u64

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impl Clone for u128

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impl Clone for ()

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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

这个 trait 是在具有任意数量参数的函数指针上实现的。

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

共享的引用可以被克隆,但是可变引用 不能!

1.17.0 · source§

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

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

1.36.0 · source§

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

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

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

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

共享的引用可以被克隆,但是可变引用 不能!

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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::Iter<'_, T>

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impl<T> Clone for BinaryHeap<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 · 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 std::collections::linked_list::Cursor<'_, T, A>where A: Allocator,

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

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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 LinkedList<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,

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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,

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 Simd<T, N>where LaneCount<N>: SupportedLaneCount, T: SimdElement,

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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)

这个 trait 在任意长度的元组上实现。

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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,