Trait std::clone::Clone 1.0.0
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#[lang = "clone"]pub trait Clone { fn clone(&self) -> Self; fn clone_from(&mut self, source: &Self) { ... } }
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.
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 an array holding more than 32 elements of a type that is Clone
; the standard
library only implements Clone
up until arrays of size 32. In this case, the implementation of
Clone
cannot be derive
d, but can be implemented as:
#[derive(Copy)] struct Stats { frequencies: [i32; 100], } impl Clone for Stats { fn clone(&self) -> Stats { *self } }Run
Required Methods
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.
Implementations on Foreign Types
impl Clone for TryFromSliceError
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fn clone(&self) -> TryFromSliceError
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fn clone_from(&mut self, source: &Self)
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impl<T> Clone for NonZero<T> where
T: Zeroable + Clone,
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T: Zeroable + Clone,
impl<I> Clone for Utf16Encoder<I> where
I: Clone,
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I: Clone,
ⓘImportant traits for Utf16Encoder<I>fn clone(&self) -> Utf16Encoder<I>
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fn clone_from(&mut self, source: &Self)
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Implementors
impl<'a, K, V> Clone for std::collections::btree_map::Keys<'a, K, V>
impl<T> Clone for Box<T> where
T: Clone,impl<'a, T> Clone for std::collections::btree_set::Difference<'a, T>
impl<'a, T> Clone for std::collections::vec_deque::Iter<'a, T>
impl<'a, K, V> Clone for std::collections::btree_map::Iter<'a, K, V>
impl<'a, T> Clone for std::collections::btree_set::SymmetricDifference<'a, T>
impl<T> Clone for std::collections::binary_heap::IntoIter<T> where
T: Clone,impl<T> Clone for BinaryHeap<T> where
T: Clone,impl Clone for AllocErr
impl<T> Clone for Vec<T> where
T: Clone,impl<'a, T> Clone for std::collections::btree_set::Range<'a, T>
impl Clone for Box<str>
impl<K, V> Clone for BTreeMap<K, V> where
K: Clone,
V: Clone,impl<T> Clone for std::rc::Weak<T> where
T: ?Sized,impl<T> Clone for std::collections::linked_list::IntoIter<T> where
T: Clone,impl<T> Clone for std::vec::IntoIter<T> where
T: Clone,impl<'a, T> Clone for std::collections::linked_list::Iter<'a, T>
impl<'a, T> Clone for std::collections::btree_set::Union<'a, T>
impl<T> Clone for std::sync::Weak<T> where
T: ?Sized,impl<T> Clone for LinkedList<T> where
T: Clone,impl<'a> Clone for EncodeUtf16<'a>
impl<T> Clone for Bound<T> where
T: Clone,impl Clone for Layout
impl<T> Clone for VecDeque<T> where
T: Clone,impl<'a, K, V> Clone for std::collections::btree_map::Values<'a, K, V>
impl Clone for Heap
impl<T> Clone for Box<[T]> where
T: Clone,impl<T> Clone for BTreeSet<T> where
T: Clone,impl<'a, B> Clone for Cow<'a, B> where
B: ToOwned + ?Sized,impl Clone for String
impl Clone for CannotReallocInPlace
impl<'a, T> Clone for std::collections::btree_set::Iter<'a, T>
impl<'a, T> Clone for std::collections::btree_set::Intersection<'a, T>
impl<T> Clone for Rc<T> where
T: ?Sized,impl Clone for ParseError
impl<'a, K, V> Clone for std::collections::btree_map::Range<'a, K, V>
impl<T> Clone for Arc<T> where
T: ?Sized,impl<'a, T> Clone for std::collections::binary_heap::Iter<'a, T>
impl<T> Clone for std::collections::vec_deque::IntoIter<T> where
T: Clone,impl Clone for ExchangeHeapSingleton
impl<I> Clone for Enumerate<I> where
I: Clone,impl<'a, P> Clone for RMatches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for NoneError
impl Clone for SearchStep
impl<'a, P> Clone for std::str::RSplit<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for SipHasher
impl Clone for Error
impl Clone for std::cmp::Ordering
impl Clone for ParseCharError
impl Clone for ParseBoolError
impl<'a> Clone for Bytes<'a>
impl<'a, A> Clone for std::option::Iter<'a, A>
impl<'a, P> Clone for MatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I, F> Clone for Inspect<I, F> where
F: Clone,
I: Clone,impl Clone for SipHasher24
impl Clone for std::sync::atomic::Ordering
impl<T> Clone for Wrapping<T> where
T: Clone,impl<I, P> Clone for TakeWhile<I, P> where
I: Clone,
P: Clone,impl<'a, T, P> Clone for std::slice::RSplit<'a, T, P> where
P: Clone + FnMut(&T) -> bool,
T: 'a + Clone,impl<'a> Clone for Chars<'a>
impl<A> Clone for Repeat<A> where
A: Clone,impl<Idx> Clone for std::ops::Range<Idx> where
Idx: Clone,impl<I> Clone for Cycle<I> where
I: Clone,impl<I> Clone for DecodeUtf8<I> where
I: Clone + Iterator<Item = u8>,impl Clone for CharTryFromError
impl<T, E> Clone for Result<T, E> where
E: Clone,
T: Clone,impl Clone for SipHasher13
impl<H> Clone for BuildHasherDefault<H>
impl<'a> Clone for LinesAny<'a>
impl<'a, P> Clone for Matches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for FpCategory
impl<A, B> Clone for Zip<A, B> where
A: Clone,
B: Clone,impl<'a, T> Clone for std::result::Iter<'a, T>
impl<'a, T, P> Clone for std::slice::Split<'a, T, P> where
P: Clone + FnMut(&T) -> bool,impl Clone for ParseIntError
impl Clone for EscapeUnicode
impl<I> Clone for Take<I> where
I: Clone,impl<'a> Clone for CharSearcher<'a>
impl<T> Clone for Unique<T> where
T: ?Sized,impl<T> Clone for ManuallyDrop<T> where
T: Clone,impl<T> Clone for RefCell<T> where
T: Clone,impl Clone for Infallible
impl<'a, P> Clone for SplitN<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<T> Clone for Rev<T> where
T: Clone,impl<I> Clone for StepBy<I> where
I: Clone,impl<T> Clone for std::result::IntoIter<T> where
T: Clone,impl Clone for ParseFloatError
impl<I> Clone for Peekable<I> where
I: Clone + Iterator,
<I as Iterator>::Item: Clone,impl<T> Clone for PhantomData<T> where
T: ?Sized,impl<Idx> Clone for RangeFrom<Idx> where
Idx: Clone,impl<A> Clone for std::option::IntoIter<A> where
A: Clone,impl<I, F> Clone for FilterMap<I, F> where
F: Clone,
I: Clone,impl Clone for TraitObject
impl Clone for Utf8Error
impl<'a, P> Clone for std::str::Split<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<T> Clone for Option<T> where
T: Clone,impl<'a, T> Clone for Windows<'a, T>
impl<Y, R> Clone for GeneratorState<Y, R> where
R: Clone,
Y: Clone,impl<'a, T> Clone for std::slice::Iter<'a, T>
impl<T> Clone for Discriminant<T>
impl<Idx> Clone for RangeInclusive<Idx> where
Idx: Clone,impl<T> Clone for Once<T> where
T: Clone,impl<Idx> Clone for RangeToInclusive<Idx> where
Idx: Clone,impl Clone for TypeId
impl<I, F> Clone for Map<I, F> where
F: Clone,
I: Clone,impl<'a, T> Clone for Chunks<'a, T>
impl<'a, F> Clone for CharPredicateSearcher<'a, F> where
F: Clone + FnMut(char) -> bool,impl<'a> Clone for CharIndices<'a>
impl<'a, P> Clone for RSplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I> Clone for Fuse<I> where
I: Clone,impl<Idx> Clone for RangeTo<Idx> where
Idx: Clone,impl<I, St, F> Clone for Scan<I, St, F> where
F: Clone,
I: Clone,
St: Clone,impl Clone for EscapeDefault
impl<I, U, F> Clone for FlatMap<I, U, F> where
F: Clone,
I: Clone,
U: Clone + IntoIterator,
<U as IntoIterator>::IntoIter: Clone,
<U as IntoIterator>::IntoIter: Clone,impl<I, P> Clone for Filter<I, P> where
I: Clone,
P: Clone,impl<T> Clone for Cell<T> where
T: Copy,impl<I> Clone for Cloned<I> where
I: Clone,impl<T> Clone for Shared<T> where
T: ?Sized,impl<I, P> Clone for SkipWhile<I, P> where
I: Clone,
P: Clone,impl Clone for TryFromIntError
impl<'a> Clone for Lines<'a>
impl<'a, P> Clone for SplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for EscapeDebug
impl Clone for RangeFull
impl<I> Clone for Skip<I> where
I: Clone,impl<'a> Clone for Arguments<'a>
impl<'a, P> Clone for RMatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a, 'b> Clone for CharSliceSearcher<'a, 'b>
impl<'a, 'b> Clone for StrSearcher<'a, 'b>
impl<T> Clone for Empty<T>
impl<A, B> Clone for Chain<A, B> where
A: Clone,
B: Clone,impl<'a, P> Clone for RSplitN<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for DecodeUtf16Error
impl Clone for UnicodeVersion
impl<I> Clone for DecodeUtf16<I> where
I: Clone + Iterator<Item = u16>,impl<'a> Clone for SplitWhitespace<'a>
impl Clone for LocalKeyState
impl Clone for ThreadId
impl Clone for Thread
impl<K: Clone, V: Clone, S: Clone> Clone for HashMap<K, V, S>
impl<'a, K, V> Clone for std::collections::hash_map::Iter<'a, K, V>
impl<'a, K, V> Clone for std::collections::hash_map::Keys<'a, K, V>
impl<'a, K, V> Clone for std::collections::hash_map::Values<'a, K, V>
impl Clone for RandomState
impl Clone for DefaultHasher
impl<T: Clone, S: Clone> Clone for HashSet<T, S>
impl<'a, K> Clone for std::collections::hash_set::Iter<'a, K>
impl<'a, T, S> Clone for std::collections::hash_set::Intersection<'a, T, S>
impl<'a, T, S> Clone for std::collections::hash_set::Difference<'a, T, S>
impl<'a, T, S> Clone for std::collections::hash_set::SymmetricDifference<'a, T, S>
impl<'a, T, S> Clone for std::collections::hash_set::Union<'a, T, S>
impl Clone for VarError
impl Clone for CString
impl Clone for NulError
impl Clone for FromBytesWithNulError
impl Clone for IntoStringError
impl Clone for OsString
impl Clone for Metadata
impl Clone for OpenOptions
impl Clone for Permissions
impl Clone for FileType
impl<T: Clone> Clone for Cursor<T>
impl Clone for ErrorKind
impl Clone for SeekFrom
impl Clone for IpAddr
impl Clone for Ipv6MulticastScope
impl Clone for Ipv4Addr
impl Clone for Ipv6Addr
impl Clone for std::net::SocketAddr
impl Clone for SocketAddrV4
impl Clone for SocketAddrV6
impl Clone for AddrParseError
impl Clone for Shutdown
impl Clone for stat
impl<'a> Clone for Prefix<'a>
impl<'a> Clone for PrefixComponent<'a>
impl<'a> Clone for Component<'a>
impl<'a> Clone for Components<'a>
impl<'a> Clone for std::path::Iter<'a>
impl Clone for PathBuf
impl Clone for StripPrefixError
impl Clone for Output
impl Clone for ExitStatus
impl<T: Clone> Clone for SendError<T>
impl Clone for RecvError
impl Clone for TryRecvError
impl Clone for RecvTimeoutError
impl<T: Clone> Clone for TrySendError<T>
impl<T> Clone for Sender<T>
impl<T> Clone for SyncSender<T>
impl Clone for WaitTimeoutResult
impl Clone for Duration
impl Clone for Instant
impl Clone for SystemTime
impl Clone for SystemTimeError
impl<'a> Clone for EncodeWide<'a>
impl Clone for std::os::unix::net::SocketAddr