Trait std::clone::Clone 1.0.0
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[src]
#[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.
Implementors
impl Clone for Normal
impl Clone for XorShiftRng
impl Clone for ReseedWithDefault
impl Clone for Exp1
impl Clone for Exp
impl Clone for IsaacRng
impl Clone for StandardNormal
impl Clone for ChaChaRng
impl Clone for LogNormal
impl Clone for Isaac64Rng
impl Clone for _Unwind_Action
impl Clone for _Unwind_Reason_Code
impl<I> Clone for DecodeUtf16<I> where
I: Clone + Iterator<Item = u16>,impl<I> Clone for Utf16Encoder<I> where
I: Clone,impl<'a> Clone for SplitWhitespace<'a>
impl Clone for DecodeUtf16Error
impl Clone for RangeFull
impl Clone for SipHasher13
impl<A> Clone for Repeat<A> where
A: Clone,impl<I, P> Clone for TakeWhile<I, P> where
I: Clone,
P: Clone,impl<'a, 'b> Clone for StrSearcher<'a, 'b>
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<T> Clone for Unique<T> where
T: ?Sized,impl<Idx> Clone for std::ops::Range<Idx> where
Idx: Clone,impl Clone for FpCategory
impl<I, P> Clone for SkipWhile<I, P> where
I: Clone,
P: Clone,impl<T> Clone for Option<T> where
T: Clone,impl Clone for TryFromIntError
impl<'a, P> Clone for MatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for TraitObject
impl<I> Clone for Peekable<I> where
I: Clone + Iterator,
<I as Iterator>::Item: Clone,impl<'a> Clone for CharSearcher<'a>
impl<A, B> Clone for Zip<A, B> where
A: Clone,
B: Clone,impl<'a, A> Clone for std::option::Iter<'a, A>
impl<Idx> Clone for RangeTo<Idx> where
Idx: Clone,impl<'a> Clone for CharIndices<'a>
impl<'a, P> Clone for RSplitN<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a> Clone for Lines<'a>
impl<I> Clone for Skip<I> where
I: Clone,impl<I, F> Clone for Map<I, F> where
F: Clone,
I: Clone,impl<'a> Clone for LinesAny<'a>
impl<'a, P> Clone for std::str::RSplit<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I, F> Clone for FilterMap<I, F> where
F: Clone,
I: Clone,impl<'a, T> Clone for std::slice::Iter<'a, T>
impl<T> Clone for Shared<T> where
T: ?Sized,impl<'a, F> Clone for CharPredicateSearcher<'a, F> where
F: Clone + FnMut(char) -> bool,impl<I, P> Clone for Filter<I, P> where
I: Clone,
P: Clone,impl<I> Clone for Take<I> where
I: Clone,impl<T> Clone for Cell<T> where
T: Copy,impl Clone for ParseFloatError
impl<T> Clone for Rev<T> where
T: Clone,impl<'a, T> Clone for std::result::Iter<'a, T>
impl Clone for Error
impl<'a, T, P> Clone for std::slice::RSplit<'a, T, P> where
P: Clone + FnMut(&T) -> bool,
T: 'a + Clone,impl<'a, T, P> Clone for std::slice::Split<'a, T, P> where
P: Clone + FnMut(&T) -> bool,impl<I, St, F> Clone for Scan<I, St, F> where
F: Clone,
I: Clone,
St: Clone,impl<'a, 'b> Clone for CharSliceSearcher<'a, 'b>
impl<'a, T> Clone for Chunks<'a, T>
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<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> Clone for DecodeUtf8<I> where
I: Clone + Iterator<Item = u8>,impl Clone for EscapeDebug
impl<A> Clone for std::option::IntoIter<A> where
A: Clone,impl<'a, P> Clone for RMatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for SipHasher
impl<T> Clone for PhantomData<T> where
T: ?Sized,impl Clone for ParseBoolError
impl<'a, P> Clone for SplitN<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<H> Clone for BuildHasherDefault<H>
impl<T> Clone for NonZero<T> where
T: Zeroable + Clone,impl Clone for ParseIntError
impl Clone for ParseCharError
impl Clone for EscapeDefault
impl<'a> Clone for Arguments<'a>
impl<'a, P> Clone for std::str::Split<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<T> Clone for Once<T> where
T: Clone,impl<T> Clone for Empty<T>
impl<Idx> Clone for RangeFrom<Idx> where
Idx: Clone,impl Clone for CharTryFromError
impl<Idx> Clone for RangeToInclusive<Idx> where
Idx: Clone,impl<Idx> Clone for RangeInclusive<Idx> where
Idx: Clone,impl<'a> Clone for Chars<'a>
impl<'a, P> Clone for SplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for TypeId
impl<'a> Clone for Bytes<'a>
impl<'a, T> Clone for Windows<'a, T>
impl<T> Clone for Discriminant<T>
impl<I> Clone for StepBy<I> where
I: Clone,impl<I> Clone for Fuse<I> where
I: Clone,impl Clone for SearchStep
impl<T> Clone for Wrapping<T> where
T: Clone,impl Clone for SipHasher24
impl Clone for std::cmp::Ordering
impl<A, B> Clone for Chain<A, B> where
A: Clone,
B: Clone,impl Clone for Utf8Error
impl<T, E> Clone for Result<T, E> where
E: Clone,
T: Clone,impl<'a, P> Clone for Matches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I> Clone for Cloned<I> where
I: Clone,impl<I> Clone for Cycle<I> where
I: Clone,impl Clone for EscapeUnicode
impl<I, F> Clone for Inspect<I, F> where
F: Clone,
I: Clone,impl Clone for std::sync::atomic::Ordering
impl Clone for statfs
impl Clone for statvfs
impl Clone for pthread_mutex_t
impl Clone for sched_param
impl Clone for sigval
impl Clone for fsid_t
impl Clone for pthread_attr_t
impl Clone for stat64
impl Clone for group
impl Clone for if_nameindex
impl Clone for ff_condition_effect
impl Clone for linger
impl Clone for ff_ramp_effect
impl Clone for hostent
impl Clone for pthread_rwlock_t
impl Clone for pthread_cond_t
impl Clone for sockaddr_ll
impl Clone for ff_envelope
impl Clone for input_absinfo
impl Clone for msghdr
impl Clone for rlimit64
impl Clone for pthread_condattr_t
impl Clone for itimerspec
impl Clone for dirent64
impl Clone for spwd
impl Clone for pthread_mutexattr_t
impl Clone for sigset_t
impl Clone for sockaddr_storage
impl Clone for flock
impl Clone for msginfo
impl Clone for lconv
impl Clone for termios
impl Clone for sockaddr
impl Clone for fd_set
impl Clone for sysinfo
impl Clone for msqid_ds
impl Clone for winsize
impl Clone for __exit_status
impl Clone for pollfd
impl Clone for sockaddr_in6
impl Clone for aiocb
impl Clone for Dl_info
impl Clone for input_keymap_entry
impl Clone for ipc_perm
impl Clone for cpu_set_t
impl Clone for __timeval
impl Clone for utsname
impl Clone for sigaction
impl Clone for statvfs64
impl Clone for in6_addr
impl Clone for glob_t
impl Clone for tms
impl Clone for utmpx
impl Clone for input_event
impl Clone for passwd
impl Clone for utimbuf
impl Clone for addrinfo
impl Clone for stat
impl Clone for input_id
impl Clone for signalfd_siginfo
impl Clone for sem_t
impl Clone for statfs64
impl Clone for in_addr
impl Clone for ipv6_mreq
impl Clone for dirent
impl Clone for ff_replay
impl Clone for pthread_rwlockattr_t
impl Clone for glob64_t
impl Clone for tm
impl Clone for ip_mreq
impl Clone for epoll_event
impl Clone for timeval
impl Clone for ff_effect
impl Clone for rusage
impl Clone for sigevent
impl Clone for sembuf
impl Clone for siginfo_t
impl Clone for ff_constant_effect
impl Clone for cmsghdr
impl Clone for sockaddr_in
impl Clone for itimerval
impl Clone for timespec
impl Clone for mmsghdr
impl Clone for ucred
impl Clone for ifaddrs
impl Clone for dqblk
impl Clone for iovec
impl Clone for ff_periodic_effect
impl Clone for shmid_ds
impl Clone for sockaddr_nl
impl Clone for stack_t
impl Clone for ff_rumble_effect
impl Clone for mq_attr
impl Clone for sockaddr_un
impl Clone for ff_trigger
impl Clone for rlimit
impl Clone for input_mask
impl<'a> Clone for EncodeUtf16<'a>
impl<K, V> Clone for BTreeMap<K, V> where
K: Clone,
V: Clone,impl<'a, K, V> Clone for std::collections::btree_map::Iter<'a, K, V>
impl Clone for Heap
impl<T> Clone for Box<T> where
T: Clone,impl Clone for Box<str>
impl Clone for ExchangeHeapSingleton
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<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<T> Clone for Box<[T]> where
T: Clone,impl<T> Clone for Vec<T> where
T: Clone,impl<T> Clone for BTreeSet<T> where
T: Clone,impl<T> Clone for std::rc::Weak<T> where
T: ?Sized,impl<T> Clone for std::vec::IntoIter<T> where
T: Clone,impl Clone for AllocErr
impl<'a, B> Clone for Cow<'a, B> where
B: ToOwned + ?Sized,impl Clone for Layout
impl<'a, T> Clone for std::collections::binary_heap::Iter<'a, T>
impl<'a, T> Clone for std::collections::btree_set::Union<'a, T>
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 Bound<T> where
T: Clone,impl<T> Clone for std::sync::Weak<T> where
T: ?Sized,impl<T> Clone for Rc<T> where
T: ?Sized,impl<'a, K, V> Clone for std::collections::btree_map::Values<'a, K, V>
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::collections::vec_deque::IntoIter<T> where
T: Clone,impl<T> Clone for VecDeque<T> where
T: Clone,impl Clone for ParseError
impl<T> Clone for LinkedList<T> where
T: Clone,impl<'a, T> Clone for std::collections::btree_set::Iter<'a, T>
impl Clone for String
impl<'a, T> Clone for std::collections::btree_set::SymmetricDifference<'a, T>
impl<'a, T> Clone for std::collections::btree_set::Difference<'a, T>
impl Clone for CannotReallocInPlace
impl<T> Clone for BinaryHeap<T> where
T: Clone,impl<T> Clone for std::collections::binary_heap::IntoIter<T> where
T: Clone,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 std::os::linux::raw::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