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