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 StandardNormal
impl Clone for LogNormal
impl Clone for ReseedWithDefault
impl Clone for Exp
impl Clone for ChaChaRng
impl Clone for IsaacRng
impl Clone for XorShiftRng
impl Clone for Isaac64Rng
impl Clone for Normal
impl Clone for Exp1
impl Clone for _Unwind_Action
impl Clone for _Unwind_Reason_Code
impl<'a> Clone for SplitWhitespace<'a>
impl Clone for DecodeUtf16Error
impl<I> Clone for DecodeUtf16<I> where
I: Clone + Iterator<Item = u16>,impl<I> Clone for Utf16Encoder<I> where
I: Clone,impl Clone for EscapeUnicode
impl<'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 SplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for RangeFull
impl Clone for TraitObject
impl<'a, A> Clone for std::option::Iter<'a, A>
impl<Idx> Clone for std::ops::Range<Idx> where
Idx: Clone,impl<I> Clone for Take<I> where
I: Clone,impl Clone for EscapeDebug
impl<I> Clone for Fuse<I> where
I: Clone,impl<'a, T> Clone for Windows<'a, T>
impl<I> Clone for Cycle<I> where
I: Clone,impl<I, P> Clone for SkipWhile<I, P> where
I: Clone,
P: Clone,impl<I> Clone for Peekable<I> where
I: Clone + Iterator,
<I as Iterator>::Item: Clone,impl<A> Clone for std::option::IntoIter<A> where
A: Clone,impl<'a, P> Clone for Matches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I, P> Clone for Filter<I, P> where
I: Clone,
P: Clone,impl<I> Clone for Skip<I> where
I: Clone,impl<T> Clone for Option<T> where
T: Clone,impl<H> Clone for BuildHasherDefault<H>
impl<'a, P> Clone for MatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for ParseIntError
impl Clone for SipHasher
impl<'a, P> Clone for RSplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for TypeId
impl<Idx> Clone for RangeInclusive<Idx> where
Idx: Clone,impl<I, F> Clone for Inspect<I, F> where
F: Clone,
I: Clone,impl Clone for EscapeDefault
impl Clone for SipHasher24
impl<T> Clone for PhantomData<T> where
T: ?Sized,impl<'a> Clone for CharSearcher<'a>
impl<'a> Clone for CharIndices<'a>
impl<'a, 'b> Clone for StrSearcher<'a, 'b>
impl<'a, P> Clone for std::str::RSplit<'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<'a, T, P> Clone for std::slice::RSplit<'a, T, P> where
P: Clone + FnMut(&T) -> bool,
T: 'a + Clone,impl Clone for std::cmp::Ordering
impl<'a, F> Clone for CharPredicateSearcher<'a, F> where
F: Clone + FnMut(char) -> bool,impl<'a, P> Clone for RMatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for SearchStep
impl<I, P> Clone for TakeWhile<I, P> where
I: Clone,
P: Clone,impl Clone for TryFromIntError
impl Clone for ParseFloatError
impl<'a, P> Clone for SplitN<'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<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<'a, T> Clone for Chunks<'a, T>
impl<T> Clone for NonZero<T> where
T: Zeroable + Clone,impl<T> Clone for Empty<T>
impl<T> Clone for Once<T> where
T: Clone,impl<'a> Clone for LinesAny<'a>
impl Clone for Utf8Error
impl<'a, P> Clone for std::str::Split<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for Error
impl<T> Clone for Unique<T> where
T: ?Sized,impl<T> Clone for RefCell<T> where
T: Clone,impl<'a, T> Clone for std::slice::Iter<'a, T>
impl Clone for FpCategory
impl<'a, P> Clone for RMatches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I> Clone for Cloned<I> where
I: Clone,impl Clone for std::sync::atomic::Ordering
impl Clone for ParseCharError
impl<T> Clone for Wrapping<T> where
T: Clone,impl<'a> Clone for Arguments<'a>
impl<'a, 'b> Clone for CharSliceSearcher<'a, 'b>
impl<A, B> Clone for Zip<A, B> where
A: Clone,
B: Clone,impl<A> Clone for Repeat<A> where
A: Clone,impl<T> Clone for Shared<T> where
T: ?Sized,impl<'a> Clone for Chars<'a>
impl<I> Clone for Enumerate<I> where
I: Clone,impl<T> Clone for Cell<T> where
T: Copy,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<Idx> Clone for RangeTo<Idx> where
Idx: Clone,impl<'a, T> Clone for std::result::Iter<'a, T>
impl<T, E> Clone for Result<T, E> where
E: Clone,
T: Clone,impl<A, B> Clone for Chain<A, B> where
A: Clone,
B: Clone,impl<'a> Clone for Bytes<'a>
impl<I, St, F> Clone for Scan<I, St, F> where
F: Clone,
I: Clone,
St: Clone,impl<'a> Clone for Lines<'a>
impl<T> Clone for Discriminant<T>
impl Clone for CharTryFromError
impl Clone for SipHasher13
impl<Idx> Clone for RangeToInclusive<Idx> where
Idx: Clone,impl Clone for ParseBoolError
impl<Idx> Clone for RangeFrom<Idx> where
Idx: Clone,impl<T> Clone for Rev<T> where
T: Clone,impl Clone for sigaction
impl Clone for timespec
impl Clone for sockaddr_storage
impl Clone for proc_threadinfo
impl Clone for termios
impl Clone for ipv6_mreq
impl Clone for statfs
impl Clone for utsname
impl Clone for dirent
impl Clone for passwd
impl Clone for mach_timebase_info
impl Clone for siginfo_t
impl Clone for if_nameindex
impl Clone for kevent
impl Clone for kevent64_s
impl Clone for ip_mreq
impl Clone for fstore_t
impl Clone for tm
impl Clone for in6_addr
impl Clone for utimbuf
impl Clone for sf_hdtr
impl Clone for Dl_info
impl Clone for itimerval
impl Clone for msghdr
impl Clone for pthread_attr_t
impl Clone for pthread_rwlockattr_t
impl Clone for if_msghdr
impl Clone for aiocb
impl Clone for cmsghdr
impl Clone for utmpx
impl Clone for glob_t
impl Clone for statvfs
impl Clone for lconv
impl Clone for flock
impl Clone for hostent
impl Clone for sockaddr
impl Clone for linger
impl Clone for timeval
impl Clone for fsid_t
impl Clone for pthread_condattr_t
impl Clone for stat
impl Clone for pthread_mutex_t
impl Clone for pthread_cond_t
impl Clone for addrinfo
impl Clone for iovec
impl Clone for if_data
impl Clone for pollfd
impl Clone for sigval
impl Clone for group
impl Clone for xsw_usage
impl Clone for sockaddr_in6
impl Clone for rusage
impl Clone for rlimit
impl Clone for fd_set
impl Clone for winsize
impl Clone for stack_t
impl Clone for sockaddr_in
impl Clone for tms
impl Clone for proc_bsdinfo
impl Clone for dqblk
impl Clone for proc_taskinfo
impl Clone for sigevent
impl Clone for proc_taskallinfo
impl Clone for radvisory
impl Clone for sockaddr_un
impl Clone for in_addr
impl Clone for pthread_rwlock_t
impl Clone for ifaddrs
impl Clone for pthread_mutexattr_t
impl<T> Clone for BinaryHeap<T> where
T: Clone,impl Clone for CannotReallocInPlace
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, T> Clone for std::collections::btree_set::SymmetricDifference<'a, T>
impl<T> Clone for std::collections::linked_list::IntoIter<T> where
T: Clone,impl<T> Clone for std::collections::vec_deque::IntoIter<T> where
T: Clone,impl<T> Clone for Arc<T> where
T: ?Sized,impl Clone for Heap
impl<T> Clone for Rc<T> where
T: ?Sized,impl Clone for AllocErr
impl<'a, T> Clone for std::collections::vec_deque::Iter<'a, T>
impl<T> Clone for Box<T> where
T: Clone,impl Clone for String
impl<T> Clone for std::rc::Weak<T> where
T: ?Sized,impl<T> Clone for std::vec::IntoIter<T> where
T: Clone,impl<'a, T> Clone for std::collections::linked_list::Iter<'a, T>
impl<'a, T> Clone for std::collections::btree_set::Difference<'a, T>
impl<'a> Clone for EncodeUtf16<'a>
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<T> Clone for std::sync::Weak<T> where
T: ?Sized,impl<T> Clone for Bound<T> where
T: Clone,impl<T> Clone for Vec<T> where
T: Clone,impl<T> Clone for BTreeSet<T> where
T: Clone,impl<'a, K, V> Clone for std::collections::btree_map::Values<'a, K, V>
impl Clone for Box<str>
impl Clone for Layout
impl<'a, T> Clone for std::collections::btree_set::Range<'a, T>
impl<T> Clone for LinkedList<T> where
T: Clone,impl<'a, T> Clone for std::collections::btree_set::Intersection<'a, T>
impl Clone for ParseError
impl<T> Clone for std::collections::binary_heap::IntoIter<T> where
T: Clone,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 Clone for ExchangeHeapSingleton
impl<T> Clone for Box<[T]> where
T: Clone,impl<T> Clone for VecDeque<T> where
T: Clone,impl<'a, K, V> Clone for std::collections::btree_map::Range<'a, K, V>
impl<'a, K, V> Clone for std::collections::btree_map::Keys<'a, K, V>
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