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<T> Clone for NonZero<T> where
T: Zeroable + Clone,
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T: Zeroable + Clone,
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<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)
1.0.0[src]
Implementors
impl Clone for Layout
impl<'a, K, V> Clone for std::collections::btree_map::Iter<'a, K, V>
impl<'a, T> Clone for std::collections::btree_set::Iter<'a, T>
impl<'a, T> Clone for std::collections::btree_set::Range<'a, T>
impl<K, V> Clone for BTreeMap<K, V> where
K: Clone,
V: Clone,impl<T> Clone for BinaryHeap<T> where
T: Clone,impl<'a, B> Clone for Cow<'a, B> where
B: ToOwned + ?Sized,impl<'a> Clone for EncodeUtf16<'a>
impl<T> Clone for std::vec::IntoIter<T> where
T: Clone,impl<'a, T> Clone for std::collections::btree_set::Union<'a, T>
impl<T> Clone for Rc<T> where
T: ?Sized,impl<T> Clone for Arc<T> where
T: ?Sized,impl Clone for CannotReallocInPlace
impl Clone for Box<str>
impl<T> Clone for Box<T> where
T: Clone,impl<'a, T> Clone for std::collections::vec_deque::Iter<'a, T>
impl<T> Clone for std::collections::vec_deque::IntoIter<T> where
T: Clone,impl<T> Clone for VecDeque<T> where
T: Clone,impl Clone for ExchangeHeapSingleton
impl<T> Clone for Box<[T]> where
T: Clone,impl Clone for String
impl<T> Clone for Vec<T> where
T: Clone,impl<'a, K, V> Clone for std::collections::btree_map::Keys<'a, K, V>
impl<'a, K, V> Clone for std::collections::btree_map::Range<'a, K, V>
impl<T> Clone for Bound<T> where
T: Clone,impl<T> Clone for std::collections::linked_list::IntoIter<T> where
T: Clone,impl<'a, T> Clone for std::collections::btree_set::Difference<'a, T>
impl Clone for AllocErr
impl<'a, T> Clone for std::collections::btree_set::SymmetricDifference<'a, T>
impl<T> Clone for std::rc::Weak<T> where
T: ?Sized,impl<T> Clone for std::collections::binary_heap::IntoIter<T> where
T: Clone,impl<'a, T> Clone for std::collections::btree_set::Intersection<'a, T>
impl Clone for ParseError
impl<'a, T> Clone for std::collections::binary_heap::Iter<'a, T>
impl<'a, K, V> Clone for std::collections::btree_map::Values<'a, K, V>
impl<T> Clone for BTreeSet<T> where
T: Clone,impl Clone for Heap
impl<T> Clone for LinkedList<T> where
T: Clone,impl<'a, T> Clone for std::collections::linked_list::Iter<'a, T>
impl<T> Clone for std::sync::Weak<T> where
T: ?Sized,impl<'a, T> Clone for std::result::Iter<'a, T>
impl<'a> Clone for CharSearcher<'a>
impl<'a> Clone for Lines<'a>
impl<I> Clone for Fuse<I> where
I: Clone,impl<A> Clone for Repeat<A> where
A: Clone,impl Clone for TraitObject
impl Clone for EscapeDefault
impl<I, P> Clone for TakeWhile<I, P> where
I: Clone,
P: Clone,impl<'a, P> Clone for RMatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a, A> Clone for std::option::Iter<'a, A>
impl<I> Clone for Enumerate<I> where
I: Clone,impl<T, E> Clone for Result<T, E> where
E: Clone,
T: Clone,impl<I> Clone for Cloned<I> where
I: Clone,impl<'a, P> Clone for std::str::Split<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I> Clone for DecodeUtf8<I> where
I: Clone + Iterator<Item = u8>,impl Clone for EscapeUnicode
impl<'a, P> Clone for SplitN<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for ParseFloatError
impl<T> Clone for Wrapping<T> where
T: Clone,impl Clone for SipHasher13
impl Clone for ParseIntError
impl<I, P> Clone for SkipWhile<I, P> where
I: Clone,
P: Clone,impl<I> Clone for Take<I> where
I: Clone,impl Clone for SearchStep
impl<'a, P> Clone for Matches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<Idx> Clone for RangeFrom<Idx> where
Idx: Clone,impl<T> Clone for std::result::IntoIter<T> where
T: Clone,impl Clone for Error
impl<Idx> Clone for std::ops::Range<Idx> where
Idx: Clone,impl Clone for Infallible
impl Clone for FpCategory
impl Clone for NoneError
impl Clone for ParseCharError
impl<'a> Clone for Bytes<'a>
impl<I> Clone for Peekable<I> where
I: Clone + Iterator,
<I as Iterator>::Item: Clone,impl Clone for CharTryFromError
impl<'a, T, P> Clone for std::slice::Split<'a, T, P> where
P: Clone + FnMut(&T) -> bool,impl Clone for TypeId
impl Clone for RangeFull
impl<I> Clone for StepBy<I> where
I: Clone,impl<I, F> Clone for FilterMap<I, F> where
F: Clone,
I: Clone,impl<'a, T> Clone for Chunks<'a, T>
impl<T> Clone for Cell<T> where
T: Copy,impl<A, B> Clone for Chain<A, B> where
A: Clone,
B: Clone,impl<A, B> Clone for Zip<A, B> where
A: Clone,
B: Clone,impl<I, F> Clone for Map<I, F> where
F: Clone,
I: Clone,impl<'a, 'b> Clone for CharSliceSearcher<'a, 'b>
impl<I> Clone for Cycle<I> where
I: Clone,impl<T> Clone for Discriminant<T>
impl<T> Clone for Rev<T> where
T: Clone,impl<'a, T, P> Clone for std::slice::RSplit<'a, T, P> where
P: Clone + FnMut(&T) -> bool,
T: 'a + Clone,impl<I, St, F> Clone for Scan<I, St, F> where
F: Clone,
I: Clone,
St: Clone,impl<T> Clone for Shared<T> where
T: ?Sized,impl<'a, P> Clone for RMatches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<T> Clone for ManuallyDrop<T> where
T: Clone,impl<Idx> Clone for RangeInclusive<Idx> where
Idx: Clone,impl Clone for SipHasher
impl<'a> Clone for Arguments<'a>
impl Clone for Utf8Error
impl<'a, P> Clone for RSplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<T> Clone for RefCell<T> where
T: Clone,impl Clone for std::cmp::Ordering
impl<A> Clone for std::option::IntoIter<A> where
A: Clone,impl<T> Clone for Unique<T> where
T: ?Sized,impl<T> Clone for PhantomData<T> where
T: ?Sized,impl Clone for std::sync::atomic::Ordering
impl<'a> Clone for Chars<'a>
impl<Idx> Clone for RangeTo<Idx> where
Idx: Clone,impl Clone for ParseBoolError
impl<'a> Clone for CharIndices<'a>
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<'a, 'b> Clone for StrSearcher<'a, 'b>
impl Clone for SipHasher24
impl<'a, P> Clone for MatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a, P> Clone for RSplitN<'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<'a, P> Clone for SplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<T> Clone for Option<T> where
T: Clone,impl<Y, R> Clone for GeneratorState<Y, R> where
R: Clone,
Y: Clone,impl<'a> Clone for LinesAny<'a>
impl<I, P> Clone for Filter<I, P> where
I: Clone,
P: Clone,impl<H> Clone for BuildHasherDefault<H>
impl<'a, T> Clone for std::slice::Iter<'a, T>
impl Clone for TryFromIntError
impl<T> Clone for Once<T> where
T: Clone,impl Clone for EscapeDebug
impl<'a, P> Clone for std::str::RSplit<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a, T> Clone for Windows<'a, T>
impl<'a, F> Clone for CharPredicateSearcher<'a, F> where
F: Clone + FnMut(char) -> bool,impl<I> Clone for Skip<I> where
I: Clone,impl<Idx> Clone for RangeToInclusive<Idx> where
Idx: Clone,impl<T> Clone for Empty<T>
impl Clone for UnicodeVersion
impl<I> Clone for DecodeUtf16<I> where
I: Clone + Iterator<Item = u16>,impl Clone for DecodeUtf16Error
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