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