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.
Implementations on Foreign Types
impl<I> Clone for Utf16Encoder<I> where
I: Clone, [src]
I: Clone,
ⓘImportant traits for Utf16Encoder<I>fn clone(&self) -> Utf16Encoder<I>[src]
fn clone_from(&mut self, source: &Self)1.0.0[src]
impl Clone for TryFromSliceError[src]
fn clone(&self) -> TryFromSliceError[src]
fn clone_from(&mut self, source: &Self)1.0.0[src]
impl<T> Clone for NonZero<T> where
T: Zeroable + Clone, [src]
T: Zeroable + Clone,
Implementors
impl Clone for UnicodeVersionimpl Clone for DecodeUtf16Errorimpl<'a> Clone for SplitWhitespace<'a>impl<I> Clone for DecodeUtf16<I> where
I: Clone + Iterator<Item = u16>,impl<T> Clone for Vec<T> where
T: Clone,impl<T> Clone for Box<[T]> where
T: Clone,impl Clone for ParseErrorimpl<'a, K, V> Clone for std::collections::btree_map::Keys<'a, K, V>impl<'a, T> Clone for std::collections::btree_set::SymmetricDifference<'a, T>impl<T> Clone for std::vec::IntoIter<T> where
T: Clone,impl<T> Clone for VecDeque<T> where
T: Clone,impl<T> Clone for BTreeSet<T> where
T: Clone,impl<'a, T> Clone for std::collections::binary_heap::Iter<'a, T>impl<T> Clone for std::collections::vec_deque::IntoIter<T> where
T: Clone,impl<T> Clone for std::sync::Weak<T> where
T: ?Sized,impl Clone for Stringimpl<'a> Clone for EncodeUtf16<'a>impl<T> Clone for Box<T> where
T: Clone,impl Clone for Heapimpl Clone for AllocErrimpl<T> Clone for std::collections::linked_list::IntoIter<T> where
T: Clone,impl<T> Clone for Rc<T> where
T: ?Sized,impl Clone for ExchangeHeapSingletonimpl<T> Clone for std::rc::Weak<T> where
T: ?Sized,impl<'a, T> Clone for std::collections::vec_deque::Iter<'a, T>impl<'a, T> Clone for std::collections::btree_set::Iter<'a, T>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 BinaryHeap<T> where
T: Clone,impl<'a, K, V> Clone for std::collections::btree_map::Values<'a, K, V>impl<'a, T> Clone for std::collections::btree_set::Difference<'a, T>impl Clone for Layoutimpl<'a, K, V> Clone for std::collections::btree_map::Iter<'a, K, V>impl<T> Clone for Arc<T> where
T: ?Sized,impl<T> Clone for LinkedList<T> where
T: Clone,impl<K, V> Clone for BTreeMap<K, V> where
K: Clone,
V: Clone,impl<'a, T> Clone for std::collections::btree_set::Intersection<'a, T>impl Clone for Box<str>impl<'a, T> Clone for std::collections::linked_list::Iter<'a, T>impl<T> Clone for std::collections::binary_heap::IntoIter<T> where
T: Clone,impl Clone for CannotReallocInPlaceimpl<'a, T> Clone for std::collections::btree_set::Union<'a, T>impl<'a, B> Clone for Cow<'a, B> where
B: ToOwned + ?Sized,impl<T> Clone for Bound<T> where
T: Clone,impl<I, P> Clone for TakeWhile<I, P> where
I: Clone,
P: Clone,impl<A> Clone for std::option::IntoIter<A> where
A: Clone,impl<T> Clone for Unique<T> where
T: ?Sized,impl<I> Clone for Skip<I> where
I: Clone,impl<'a, P> Clone for RSplitN<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for EscapeUnicodeimpl<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<T, E> Clone for Result<T, E> where
E: Clone,
T: Clone,impl Clone for ParseCharErrorimpl Clone for RangeFullimpl Clone for SipHasherimpl Clone for ParseIntErrorimpl Clone for TraitObjectimpl<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<T> Clone for PhantomData<T> where
T: ?Sized,impl<Idx> Clone for std::ops::Range<Idx> where
Idx: Clone,impl Clone for NoneErrorimpl<T> Clone for RefCell<T> where
T: Clone,impl Clone for EscapeDebugimpl<T> Clone for Cell<T> where
T: Copy,impl<T> Clone for Wrapping<T> where
T: Clone,impl<T> Clone for Once<T> where
T: Clone,impl<I, F> Clone for FilterMap<I, F> where
F: Clone,
I: Clone,impl<'a, T> Clone for std::result::Iter<'a, T>impl<I> Clone for Peekable<I> where
I: Clone + Iterator,
<I as Iterator>::Item: Clone,impl<'a, P> Clone for std::str::Split<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for EscapeDefaultimpl<'a, P> Clone for RMatches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<H> Clone for BuildHasherDefault<H>impl<T> Clone for Empty<T>impl<I, St, F> Clone for Scan<I, St, F> where
F: Clone,
I: Clone,
St: Clone,impl<A> Clone for Repeat<A> where
A: Clone,impl<'a, 'b> Clone for CharSliceSearcher<'a, 'b>impl Clone for ParseFloatErrorimpl Clone for SipHasher13impl<I, F> Clone for Map<I, F> where
F: Clone,
I: Clone,impl<I> Clone for Fuse<I> where
I: Clone,impl<I> Clone for Cloned<I> where
I: Clone,impl<Idx> Clone for RangeFrom<Idx> where
Idx: Clone,impl<T> Clone for Rev<T> where
T: Clone,impl<'a, T, P> Clone for std::slice::RSplit<'a, T, P> where
P: Clone + FnMut(&T) -> bool,
T: 'a + Clone,impl<A, B> Clone for Zip<A, B> where
A: Clone,
B: Clone,impl<'a, T> Clone for Windows<'a, T>impl Clone for Infallibleimpl<'a> Clone for Lines<'a>impl<I> Clone for Take<I> where
I: Clone,impl<'a> Clone for Arguments<'a>impl<'a> Clone for CharSearcher<'a>impl<I> Clone for Cycle<I> where
I: Clone,impl<'a> Clone for Chars<'a>impl<'a, T, P> Clone for std::slice::Split<'a, T, P> where
P: Clone + FnMut(&T) -> bool,impl<I> Clone for DecodeUtf8<I> where
I: Clone + Iterator<Item = u8>,impl<I, P> Clone for Filter<I, P> where
I: Clone,
P: Clone,impl<'a, P> Clone for Matches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a, P> Clone for MatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<Idx> Clone for RangeTo<Idx> where
Idx: Clone,impl<Idx> Clone for RangeInclusive<Idx> where
Idx: Clone,impl<'a> Clone for Bytes<'a>impl<'a, T> Clone for std::slice::Iter<'a, T>impl<A, B> Clone for Chain<A, B> where
A: Clone,
B: Clone,impl<Y, R> Clone for GeneratorState<Y, R> where
R: Clone,
Y: Clone,impl<T> Clone for Shared<T> where
T: ?Sized,impl<'a, F> Clone for CharPredicateSearcher<'a, F> where
F: Clone + FnMut(char) -> bool,impl Clone for CharTryFromErrorimpl<'a> Clone for LinesAny<'a>impl<I, F> Clone for Inspect<I, F> where
F: Clone,
I: Clone,impl<'a> Clone for CharIndices<'a>impl Clone for std::sync::atomic::Orderingimpl Clone for Errorimpl Clone for std::cmp::Orderingimpl<Idx> Clone for RangeToInclusive<Idx> where
Idx: Clone,impl Clone for SearchStepimpl<'a, P> Clone for std::str::RSplit<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a, P> Clone for RSplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a, A> Clone for std::option::Iter<'a, A>impl Clone for ParseBoolErrorimpl<T> Clone for std::result::IntoIter<T> where
T: Clone,impl<T> Clone for ManuallyDrop<T> where
T: Clone,impl<T> Clone for Discriminant<T>impl<'a, P> Clone for RMatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a, P> Clone for SplitN<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for Utf8Errorimpl<I> Clone for Enumerate<I> where
I: Clone,impl<'a, 'b> Clone for StrSearcher<'a, 'b>impl<T> Clone for Option<T> where
T: Clone,impl<I, P> Clone for SkipWhile<I, P> where
I: Clone,
P: Clone,impl Clone for TryFromIntErrorimpl<'a, T> Clone for Chunks<'a, T>impl Clone for TypeIdimpl Clone for FpCategoryimpl 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 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