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 derived
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 derived, 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.
Implementors
impl<'a> Clone for SplitWhitespace<'a>impl<I> Clone for Utf16Encoder<I> where
I: Clone,impl<I> Clone for DecodeUtf16<I> where
I: Clone + Iterator<Item = u16>,impl Clone for DecodeUtf16Errorimpl Clone for Stringimpl<'a> Clone for EncodeUtf16<'a>impl<'a, T> Clone for std::collections::vec_deque::Iter<'a, T>impl<'a, T> Clone for std::collections::linked_list::Iter<'a, T>impl<T> Clone for std::rc::Weak<T> where
T: ?Sized,impl Clone for Layoutimpl<T> Clone for std::collections::vec_deque::IntoIter<T> where
T: Clone,impl Clone for ExchangeHeapSingletonimpl<'a, B> Clone for Cow<'a, B> where
B: ToOwned + ?Sized,impl<T> Clone for Box<T> where
T: Clone,impl<'a, K, V> Clone for std::collections::btree_map::Range<'a, K, V>impl Clone for AllocErrimpl<'a, T> Clone for std::collections::btree_set::SymmetricDifference<'a, T>impl<'a, T> Clone for std::collections::btree_set::Iter<'a, T>impl<T> Clone for std::collections::linked_list::IntoIter<T> where
T: Clone,impl<'a, T> Clone for std::collections::btree_set::Intersection<'a, T>impl<'a, K, V> Clone for std::collections::btree_map::Values<'a, K, V>impl<T> Clone for BinaryHeap<T> where
T: Clone,impl<'a, T> Clone for std::collections::binary_heap::Iter<'a, T>impl<T> Clone for Bound<T> where
T: Clone,impl<T> Clone for LinkedList<T> where
T: Clone,impl Clone for Heapimpl Clone for ParseErrorimpl<'a, T> Clone for std::collections::btree_set::Range<'a, T>impl<T> Clone for VecDeque<T> where
T: Clone,impl Clone for CannotReallocInPlaceimpl<T> Clone for Vec<T> where
T: Clone,impl<'a, K, V> Clone for std::collections::btree_map::Keys<'a, K, V>impl<'a, T> Clone for std::collections::btree_set::Difference<'a, T>impl<'a, T> Clone for std::collections::btree_set::Union<'a, T>impl<T> Clone for Rc<T> where
T: ?Sized,impl Clone for Box<str>impl<'a, K, V> Clone for std::collections::btree_map::Iter<'a, K, V>impl<T> Clone for BTreeSet<T> where
T: Clone,impl<T> Clone for std::sync::Weak<T> where
T: ?Sized,impl<T> Clone for Arc<T> where
T: ?Sized,impl<T> Clone for std::collections::binary_heap::IntoIter<T> where
T: Clone,impl<T> Clone for std::vec::IntoIter<T> where
T: Clone,impl<T> Clone for Box<[T]> where
T: Clone,impl<K, V> Clone for BTreeMap<K, V> where
K: Clone,
V: Clone,impl Clone for _Unwind_Stateimpl Clone for _Unwind_Reason_Codeimpl Clone for XorShiftRngimpl Clone for Expimpl Clone for Exp1impl Clone for IsaacRngimpl Clone for ChaChaRngimpl Clone for Isaac64Rngimpl Clone for Normalimpl Clone for ReseedWithDefaultimpl Clone for StandardNormalimpl Clone for LogNormalimpl Clone for pthread_rwlockattr_timpl Clone for utimbufimpl Clone for sockaddr_llimpl Clone for itimerspecimpl Clone for ff_periodic_effectimpl Clone for winsizeimpl Clone for spwdimpl Clone for utsnameimpl Clone for statvfsimpl Clone for rlimitimpl Clone for if_nameindeximpl Clone for shmid_dsimpl Clone for fd_setimpl Clone for tmimpl Clone for sockaddr_in6impl Clone for timevalimpl Clone for msginfoimpl Clone for lconvimpl Clone for tmsimpl Clone for glob_timpl Clone for pthread_mutex_timpl Clone for dirent64impl Clone for pollfdimpl Clone for input_eventimpl Clone for rlimit64impl Clone for pthread_mutexattr_timpl Clone for input_maskimpl Clone for ff_rumble_effectimpl Clone for pthread_attr_timpl Clone for hostentimpl Clone for utmpximpl Clone for itimervalimpl Clone for dqblkimpl Clone for sem_timpl Clone for sockaddr_inimpl Clone for libc::unix::notbsd::linux::other::b32::statimpl Clone for ip_mreqimpl Clone for ucredimpl Clone for sockaddr_storageimpl Clone for cmsghdrimpl Clone for stat64impl Clone for statfs64impl Clone for Dl_infoimpl Clone for ifaddrsimpl Clone for lingerimpl Clone for fsid_timpl Clone for sockaddr_unimpl Clone for cpu_set_timpl Clone for flockimpl Clone for stack_timpl Clone for sockaddrimpl Clone for epoll_eventimpl Clone for sembufimpl Clone for groupimpl Clone for ff_effectimpl Clone for msqid_dsimpl Clone for ff_replayimpl Clone for aiocbimpl Clone for ff_condition_effectimpl Clone for sockaddr_nlimpl Clone for rusageimpl Clone for __timevalimpl Clone for ff_constant_effectimpl Clone for direntimpl Clone for iovecimpl Clone for sigset_timpl Clone for ipc_permimpl Clone for sigeventimpl Clone for addrinfoimpl Clone for sigactionimpl Clone for ff_triggerimpl Clone for signalfd_siginfoimpl Clone for input_absinfoimpl Clone for input_keymap_entryimpl Clone for in6_addrimpl Clone for ff_envelopeimpl Clone for mq_attrimpl Clone for termiosimpl Clone for mmsghdrimpl Clone for pthread_rwlock_timpl Clone for passwdimpl Clone for statfsimpl Clone for pthread_condattr_timpl Clone for __exit_statusimpl Clone for sched_paramimpl Clone for sigvalimpl Clone for in_addrimpl Clone for sysinfoimpl Clone for siginfo_timpl Clone for msghdrimpl Clone for glob64_timpl Clone for statvfs64impl Clone for timespecimpl Clone for pthread_cond_timpl Clone for ff_ramp_effectimpl Clone for input_idimpl Clone for ipv6_mreqimpl Clone for EscapeUnicodeimpl<Idx> Clone for std::ops::Range<Idx> where
Idx: Clone,impl<T> Clone for PhantomData<T> where
T: ?Sized,impl<T> Clone for Shared<T> where
T: ?Sized,impl<I> Clone for Cycle<I> where
I: Clone,impl Clone for ParseCharErrorimpl Clone for TryFromIntErrorimpl<T> Clone for Empty<T>impl<'a, P> Clone for SplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for EscapeDefaultimpl<'a, P> Clone for Matches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<T, E> Clone for Result<T, E> where
E: Clone,
T: Clone,impl<I> Clone for Cloned<I> where
I: Clone,impl Clone for CharTryFromErrorimpl<'a, T, P> Clone for std::slice::Split<'a, T, P> where
P: Clone + FnMut(&T) -> bool,impl<I> Clone for StepBy<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 Clone for SipHasher13impl Clone for FpCategoryimpl<'a, P> Clone for SplitN<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I> Clone for Peekable<I> where
I: Clone + Iterator,
<I as Iterator>::Item: Clone,impl<I> Clone for Skip<I> where
I: Clone,impl<'a> Clone for Arguments<'a>impl<'a, P> Clone for RMatches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for ParseBoolErrorimpl<'a, 'b> Clone for StrSearcher<'a, 'b>impl<T> Clone for Wrapping<T> where
T: Clone,impl<'a> Clone for Chars<'a>impl<'a> Clone for CharIndices<'a>impl<'a, F> Clone for CharPredicateSearcher<'a, F> where
F: Clone + FnMut(char) -> bool,impl<T> Clone for Once<T> where
T: Clone,impl<A> Clone for std::option::IntoIter<A> where
A: Clone,impl<'a> Clone for CharSearcher<'a>impl Clone for ParseFloatErrorimpl<'a, P> Clone for std::str::RSplit<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<A, B> Clone for Zip<A, B> where
A: Clone,
B: Clone,impl<T> Clone for Discriminant<T>impl<I, F> Clone for Map<I, F> where
F: Clone,
I: Clone,impl<I, F> Clone for FilterMap<I, F> where
F: Clone,
I: Clone,impl Clone for SipHasherimpl<Idx> Clone for RangeInclusive<Idx> where
Idx: Clone,impl<Idx> Clone for RangeToInclusive<Idx> where
Idx: Clone,impl<I, St, F> Clone for Scan<I, St, F> where
F: Clone,
I: Clone,
St: Clone,impl<A, B> Clone for Chain<A, B> where
A: Clone,
B: Clone,impl<'a, T> Clone for Windows<'a, T>impl<I> Clone for Enumerate<I> where
I: Clone,impl Clone for std::sync::atomic::Orderingimpl<I, F> Clone for Inspect<I, F> where
F: Clone,
I: Clone,impl<I> Clone for Take<I> where
I: Clone,impl<H> Clone for BuildHasherDefault<H>impl Clone for RangeFullimpl<A> Clone for Repeat<A> where
A: Clone,impl<'a, T, P> Clone for std::slice::RSplit<'a, T, P> where
P: Clone + FnMut(&T) -> bool,
T: 'a + Clone,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<'a> Clone for Lines<'a>impl<T> Clone for Rev<T> where
T: Clone,impl Clone for Utf8Errorimpl<'a, P> Clone for RMatchIndices<'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 Clone for EscapeDebugimpl Clone for SipHasher24impl Clone for std::cmp::Orderingimpl<'a> Clone for Bytes<'a>impl<'a, T> Clone for Chunks<'a, T>impl<T> Clone for NonZero<T> where
T: Zeroable + Clone,impl<I> Clone for Fuse<I> where
I: Clone,impl<I, P> Clone for SkipWhile<I, P> where
I: Clone,
P: Clone,impl<I, P> Clone for Filter<I, P> where
I: Clone,
P: Clone,impl<T> Clone for Unique<T> where
T: ?Sized,impl<'a, A> Clone for std::option::Iter<'a, A>impl<T> Clone for Option<T> where
T: Clone,impl<T> Clone for Cell<T> where
T: Copy,impl<'a, T> Clone for std::slice::Iter<'a, T>impl Clone for TraitObjectimpl Clone for ParseIntErrorimpl<I> Clone for DecodeUtf8<I> where
I: Clone + Iterator<Item = u8>,impl<Idx> Clone for RangeTo<Idx> where
Idx: Clone,impl<Idx> Clone for RangeFrom<Idx> where
Idx: Clone,impl<'a> Clone for LinesAny<'a>impl Clone for SearchStepimpl Clone for TypeIdimpl<'a, T> Clone for std::result::Iter<'a, T>impl<'a, P> Clone for MatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a, 'b> Clone for CharSliceSearcher<'a, 'b>impl Clone for Errorimpl<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 TakeWhile<I, P> where
I: Clone,
P: Clone,impl Clone for LocalKeyStateimpl Clone for ThreadIdimpl Clone for Threadimpl<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 RandomStateimpl Clone for DefaultHasherimpl<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 VarErrorimpl Clone for CStringimpl Clone for NulErrorimpl Clone for FromBytesWithNulErrorimpl Clone for IntoStringErrorimpl Clone for OsStringimpl Clone for Metadataimpl Clone for OpenOptionsimpl Clone for Permissionsimpl Clone for FileTypeimpl<T: Clone> Clone for Cursor<T>impl Clone for ErrorKindimpl Clone for SeekFromimpl Clone for IpAddrimpl Clone for Ipv6MulticastScopeimpl Clone for Ipv4Addrimpl Clone for Ipv6Addrimpl Clone for std::net::SocketAddrimpl Clone for SocketAddrV4impl Clone for SocketAddrV6impl Clone for AddrParseErrorimpl Clone for Shutdownimpl Clone for std::os::linux::raw::statimpl<'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 PathBufimpl Clone for StripPrefixErrorimpl Clone for Outputimpl Clone for ExitStatusimpl<T: Clone> Clone for SendError<T>impl Clone for RecvErrorimpl Clone for TryRecvErrorimpl Clone for RecvTimeoutErrorimpl<T: Clone> Clone for TrySendError<T>impl<T> Clone for Sender<T>impl<T> Clone for SyncSender<T>impl Clone for WaitTimeoutResultimpl Clone for Durationimpl Clone for Instantimpl Clone for SystemTimeimpl Clone for SystemTimeErrorimpl<'a> Clone for EncodeWide<'a>impl Clone for std::os::unix::net::SocketAddr