1.0.0[−][src]Trait core::clone::Clone
A common trait for the ability to explicitly duplicate an object.
Differs from Copy
in that Copy
is implicit and extremely inexpensive, 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 derive
d
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 derive
d, 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
) - Array types, for all sizes, if the item type also implements
Clone
(e.g.,[i32; 123456]
) - Tuple types, if each component also implements
Clone
(e.g.,()
,(i32, bool)
) - 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 implementClone
(even if the referent doesn't), while variables captured by mutable reference never implementClone
.
Required methods
#[must_use = "cloning is often expensive and is not expected to have side effects"]
fn clone(&self) -> Self
Provided methods
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
impl Clone for !
[src]
impl Clone for core::cmp::Ordering
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impl Clone for Infallible
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impl Clone for FpCategory
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impl Clone for IntErrorKind
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impl Clone for SearchStep
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impl Clone for core::sync::atomic::Ordering
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impl Clone for AllocErr
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impl Clone for CannotReallocInPlace
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impl Clone for Layout
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impl Clone for LayoutErr
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impl Clone for TypeId
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impl Clone for float64x1_t
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impl Clone for float64x2_t
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impl Clone for int8x16x2_t
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impl Clone for int8x16x3_t
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impl Clone for int8x16x4_t
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impl Clone for poly64x1_t
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impl Clone for poly64x2_t
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impl Clone for poly8x16x2_t
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impl Clone for poly8x16x3_t
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impl Clone for poly8x16x4_t
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impl Clone for uint8x16x2_t
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impl Clone for uint8x16x3_t
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impl Clone for uint8x16x4_t
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impl Clone for float32x2_t
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impl Clone for float32x4_t
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impl Clone for int16x2_t
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impl Clone for int16x4_t
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impl Clone for int16x8_t
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impl Clone for int32x2_t
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impl Clone for int32x4_t
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impl Clone for int64x1_t
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impl Clone for int64x2_t
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impl Clone for int8x16_t
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impl Clone for int8x4_t
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impl Clone for int8x8_t
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impl Clone for int8x8x2_t
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impl Clone for int8x8x3_t
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impl Clone for int8x8x4_t
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impl Clone for poly16x4_t
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impl Clone for poly16x8_t
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impl Clone for poly8x16_t
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impl Clone for poly8x8_t
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impl Clone for poly8x8x2_t
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impl Clone for poly8x8x3_t
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impl Clone for poly8x8x4_t
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impl Clone for uint16x2_t
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impl Clone for uint16x4_t
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impl Clone for uint16x8_t
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impl Clone for uint32x2_t
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impl Clone for uint32x4_t
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impl Clone for uint64x1_t
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impl Clone for uint64x2_t
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impl Clone for uint8x16_t
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impl Clone for uint8x4_t
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impl Clone for uint8x8_t
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impl Clone for uint8x8x2_t
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impl Clone for uint8x8x3_t
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impl Clone for uint8x8x4_t
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impl Clone for i8x16
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impl Clone for vector_bool_long
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impl Clone for vector_double
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impl Clone for vector_signed_long
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impl Clone for vector_unsigned_long
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impl Clone for v128
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impl Clone for CpuidResult
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impl Clone for __m128
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impl Clone for __m128d
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impl Clone for __m128i
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impl Clone for __m256
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impl Clone for __m256d
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impl Clone for __m256i
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impl Clone for __m512
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impl Clone for __m512d
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impl Clone for __m512i
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impl Clone for __m64
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impl Clone for TryFromSliceError
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impl Clone for CharTryFromError
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impl Clone for DecodeUtf16Error
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impl Clone for core::char::EscapeDebug
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ⓘImportant traits for EscapeDebugfn clone(&self) -> EscapeDebug
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl Clone for core::char::EscapeDefault
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ⓘImportant traits for EscapeDefaultfn clone(&self) -> EscapeDefault
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fn clone_from(&mut self, source: &Self)
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impl Clone for core::char::EscapeUnicode
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ⓘImportant traits for EscapeUnicodefn clone(&self) -> EscapeUnicode
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fn clone_from(&mut self, source: &Self)
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impl Clone for ParseCharError
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impl Clone for ToLowercase
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ⓘImportant traits for ToLowercasefn clone(&self) -> ToLowercase
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fn clone_from(&mut self, source: &Self)
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impl Clone for ToUppercase
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ⓘImportant traits for ToUppercasefn clone(&self) -> ToUppercase
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fn clone_from(&mut self, source: &Self)
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impl Clone for UnicodeVersion
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impl Clone for Error
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impl Clone for SipHasher
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impl Clone for PhantomPinned
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impl Clone for NonZeroI128
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impl Clone for NonZeroI16
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impl Clone for NonZeroI32
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impl Clone for NonZeroI64
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impl Clone for NonZeroI8
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impl Clone for NonZeroIsize
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impl Clone for NonZeroU128
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impl Clone for NonZeroU16
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impl Clone for NonZeroU32
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impl Clone for NonZeroU64
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impl Clone for NonZeroU8
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impl Clone for NonZeroUsize
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impl Clone for ParseFloatError
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impl Clone for ParseIntError
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impl Clone for TryFromIntError
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impl Clone for RangeFull
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impl Clone for NoneError
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impl Clone for TraitObject
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impl Clone for ParseBoolError
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impl Clone for Utf8Error
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impl Clone for RawWakerVTable
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impl Clone for Waker
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impl Clone for Duration
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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 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 usize
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impl<'a> Clone for Arguments<'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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ⓘImportant traits for Bytes<'_>fn clone(&self) -> Bytes<'a>
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fn clone_from(&mut self, source: &Self)
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impl<'a> Clone for CharIndices<'a>
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ⓘImportant traits for CharIndices<'a>fn clone(&self) -> CharIndices<'a>
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fn clone_from(&mut self, source: &Self)
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impl<'a> Clone for Chars<'a>
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ⓘImportant traits for Chars<'a>fn clone(&self) -> Chars<'a>
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fn clone_from(&mut self, source: &Self)
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impl<'a> Clone for EncodeUtf16<'a>
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ⓘImportant traits for EncodeUtf16<'a>fn clone(&self) -> EncodeUtf16<'a>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<'a> Clone for core::str::EscapeDebug<'a>
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ⓘImportant traits for EscapeDebug<'a>fn clone(&self) -> EscapeDebug<'a>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<'a> Clone for core::str::EscapeDefault<'a>
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ⓘImportant traits for EscapeDefault<'a>fn clone(&self) -> EscapeDefault<'a>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<'a> Clone for core::str::EscapeUnicode<'a>
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ⓘImportant traits for EscapeUnicode<'a>fn clone(&self) -> EscapeUnicode<'a>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<'a> Clone for Lines<'a>
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ⓘImportant traits for Lines<'a>fn clone(&self) -> Lines<'a>
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fn clone_from(&mut self, source: &Self)
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impl<'a> Clone for LinesAny<'a>
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ⓘImportant traits for LinesAny<'a>fn clone(&self) -> LinesAny<'a>
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fn clone_from(&mut self, source: &Self)
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impl<'a> Clone for SplitAsciiWhitespace<'a>
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ⓘImportant traits for SplitAsciiWhitespace<'a>fn clone(&self) -> SplitAsciiWhitespace<'a>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<'a> Clone for SplitWhitespace<'a>
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ⓘImportant traits for SplitWhitespace<'a>fn clone(&self) -> SplitWhitespace<'a>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
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, F: Clone> Clone for CharPredicateSearcher<'a, F> where
F: FnMut(char) -> bool,
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F: FnMut(char) -> bool,
fn clone(&self) -> CharPredicateSearcher<'a, F>
[src]
fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<'a, P: Pattern<'a>> Clone for MatchIndices<'a, P> where
P::Searcher: Clone,
[src]
P::Searcher: Clone,
impl<'a, P: Pattern<'a>> Clone for Matches<'a, P> where
P::Searcher: Clone,
[src]
P::Searcher: Clone,
impl<'a, P: Pattern<'a>> Clone for RMatchIndices<'a, P> where
P::Searcher: Clone,
[src]
P::Searcher: Clone,
impl<'a, P: Pattern<'a>> Clone for RMatches<'a, P> where
P::Searcher: Clone,
[src]
P::Searcher: Clone,
impl<'a, P: Pattern<'a>> Clone for core::str::RSplit<'a, P> where
P::Searcher: Clone,
[src]
P::Searcher: Clone,
impl<'a, P: Pattern<'a>> Clone for RSplitN<'a, P> where
P::Searcher: Clone,
[src]
P::Searcher: Clone,
impl<'a, P: Pattern<'a>> Clone for RSplitTerminator<'a, P> where
P::Searcher: Clone,
[src]
P::Searcher: Clone,
impl<'a, P: Pattern<'a>> Clone for core::str::Split<'a, P> where
P::Searcher: Clone,
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P::Searcher: Clone,
impl<'a, P: Pattern<'a>> Clone for SplitN<'a, P> where
P::Searcher: Clone,
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P::Searcher: Clone,
impl<'a, P: Pattern<'a>> Clone for SplitTerminator<'a, P> where
P::Searcher: Clone,
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P::Searcher: Clone,
impl<'a, T> Clone for RChunksExact<'a, T>
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ⓘImportant traits for RChunksExact<'a, T>fn clone(&self) -> RChunksExact<'a, T>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<'a, T: Clone + 'a, P: Clone> Clone for core::slice::RSplit<'a, T, P> where
P: FnMut(&T) -> bool,
[src]
P: FnMut(&T) -> bool,
ⓘImportant traits for RSplit<'a, T, P>fn clone(&self) -> RSplit<'a, T, P>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<A, '_> Clone for core::option::Iter<'_, A>
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impl<A: Clone> Clone for Repeat<A>
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ⓘImportant traits for Repeat<A>fn clone(&self) -> Repeat<A>
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fn clone_from(&mut self, source: &Self)
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impl<A: Clone> Clone for core::option::IntoIter<A>
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ⓘImportant traits for IntoIter<A>fn clone(&self) -> IntoIter<A>
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fn clone_from(&mut self, source: &Self)
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impl<A: Clone, B: Clone> Clone for Chain<A, B>
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ⓘImportant traits for Chain<A, B>fn clone(&self) -> Chain<A, B>
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fn clone_from(&mut self, source: &Self)
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impl<A: Clone, B: Clone> Clone for Zip<A, B>
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ⓘImportant traits for Zip<A, B>fn clone(&self) -> Zip<A, B>
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fn clone_from(&mut self, source: &Self)
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impl<F: Clone> Clone for FromFn<F>
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ⓘImportant traits for FromFn<F>fn clone(&self) -> FromFn<F>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<F: Clone> Clone for OnceWith<F>
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ⓘImportant traits for OnceWith<F>fn clone(&self) -> OnceWith<F>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<F: Clone> Clone for RepeatWith<F>
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ⓘImportant traits for RepeatWith<F>fn clone(&self) -> RepeatWith<F>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<H> Clone for BuildHasherDefault<H>
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impl<I, U> Clone for Flatten<I> where
I: Iterator + Clone,
U: Iterator + Clone,
I::Item: IntoIterator<IntoIter = U, Item = U::Item>,
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I: Iterator + Clone,
U: Iterator + Clone,
I::Item: IntoIterator<IntoIter = U, Item = U::Item>,
impl<I: Clone + Iterator> Clone for Peekable<I> where
I::Item: Clone,
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I::Item: Clone,
ⓘImportant traits for Peekable<I>fn clone(&self) -> Peekable<I>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone> Clone for DecodeUtf16<I> where
I: Iterator<Item = u16>,
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I: Iterator<Item = u16>,
ⓘImportant traits for DecodeUtf16<I>fn clone(&self) -> DecodeUtf16<I>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<I: Clone> Clone for Cloned<I>
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ⓘImportant traits for Cloned<I>fn clone(&self) -> Cloned<I>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<I: Clone> Clone for Copied<I>
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ⓘImportant traits for Copied<I>fn clone(&self) -> Copied<I>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<I: Clone> Clone for Cycle<I>
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ⓘImportant traits for Cycle<I>fn clone(&self) -> Cycle<I>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone> Clone for Enumerate<I>
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ⓘImportant traits for Enumerate<I>fn clone(&self) -> Enumerate<I>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone> Clone for Fuse<I>
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ⓘImportant traits for Fuse<I>fn clone(&self) -> Fuse<I>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone> Clone for Skip<I>
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ⓘImportant traits for Skip<I>fn clone(&self) -> Skip<I>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone> Clone for StepBy<I>
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ⓘImportant traits for StepBy<I>fn clone(&self) -> StepBy<I>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<I: Clone> Clone for Take<I>
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ⓘImportant traits for Take<I>fn clone(&self) -> Take<I>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone, F: Clone> Clone for FilterMap<I, F>
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ⓘImportant traits for FilterMap<I, F>fn clone(&self) -> FilterMap<I, F>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone, F: Clone> Clone for Inspect<I, F>
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ⓘImportant traits for Inspect<I, F>fn clone(&self) -> Inspect<I, F>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone, F: Clone> Clone for Map<I, F>
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ⓘImportant traits for Map<I, F>fn clone(&self) -> Map<I, F>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone, P: Clone> Clone for Filter<I, P>
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ⓘImportant traits for Filter<I, P>fn clone(&self) -> Filter<I, P>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone, P: Clone> Clone for SkipWhile<I, P>
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ⓘImportant traits for SkipWhile<I, P>fn clone(&self) -> SkipWhile<I, P>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone, P: Clone> Clone for TakeWhile<I, P>
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ⓘImportant traits for TakeWhile<I, P>fn clone(&self) -> TakeWhile<I, P>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone, St: Clone, F: Clone> Clone for Scan<I, St, F>
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ⓘImportant traits for Scan<I, St, F>fn clone(&self) -> Scan<I, St, F>
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fn clone_from(&mut self, source: &Self)
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impl<I: Clone, U: Clone + IntoIterator, F: Clone> Clone for FlatMap<I, U, F> where
<U as IntoIterator>::IntoIter: Clone,
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<U as IntoIterator>::IntoIter: Clone,
impl<Idx: Clone> Clone for Range<Idx>
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ⓘImportant traits for Range<A>fn clone(&self) -> Range<Idx>
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fn clone_from(&mut self, source: &Self)
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impl<Idx: Clone> Clone for RangeFrom<Idx>
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ⓘImportant traits for RangeFrom<A>fn clone(&self) -> RangeFrom<Idx>
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fn clone_from(&mut self, source: &Self)
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impl<Idx: Clone> Clone for RangeInclusive<Idx>
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ⓘImportant traits for RangeInclusive<A>fn clone(&self) -> RangeInclusive<Idx>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<Idx: Clone> Clone for RangeTo<Idx>
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impl<Idx: Clone> Clone for RangeToInclusive<Idx>
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impl<P: Clone> Clone for Pin<P>
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ⓘImportant traits for Pin<P>fn clone(&self) -> Pin<P>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<T> Clone for Empty<T>
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ⓘImportant traits for Empty<T>fn clone(&self) -> Empty<T>
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl<T> Clone for Discriminant<T>
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impl<T, '_> Clone for core::result::Iter<'_, T>
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impl<T, '_> Clone for Chunks<'_, T>
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impl<T, '_> Clone for ChunksExact<'_, T>
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impl<T, '_> Clone for core::slice::Iter<'_, T>
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impl<T, '_> Clone for RChunks<'_, T>
[src]
impl<T, '_> Clone for Windows<'_, T>
[src]
impl<T, P, '_> Clone for core::slice::Split<'_, T, P> where
P: Clone + FnMut(&T) -> bool,
[src]
P: Clone + FnMut(&T) -> bool,
impl<T: Clone + ?Sized> Clone for ManuallyDrop<T>
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impl<T: Clone> Clone for Bound<T>
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impl<T: Clone> Clone for Option<T>
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impl<T: Clone> Clone for Poll<T>
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impl<T: Clone> Clone for RefCell<T>
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fn clone(&self) -> RefCell<T>
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Panics
Panics if the value is currently mutably borrowed.