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 DecodeUtf16Errorimpl Clone for UnicodeVersionimpl<I> Clone for DecodeUtf16<I> where
I: Clone + Iterator<Item = u16>,impl<'a> Clone for SplitWhitespace<'a>impl<T> Clone for Arc<T> where
T: ?Sized,impl Clone for Box<str>impl<T> Clone for BTreeSet<T> where
T: Clone,impl<T> Clone for Vec<T> where
T: Clone,impl<'a, K, V> Clone for std::collections::btree_map::Iter<'a, K, V>impl<T> Clone for VecDeque<T> where
T: Clone,impl<'a, K, V> Clone for std::collections::btree_map::Values<'a, K, V>impl<'a> Clone for EncodeUtf16<'a>impl<'a, T> Clone for std::collections::btree_set::Iter<'a, T>impl<T> Clone for std::collections::binary_heap::IntoIter<T> where
T: Clone,impl Clone for Layoutimpl<T> Clone for Rc<T> where
T: ?Sized,impl<'a, T> Clone for std::collections::vec_deque::Iter<'a, T>impl Clone for CannotReallocInPlaceimpl<T> Clone for Box<[T]> where
T: Clone,impl<'a, T> Clone for std::collections::btree_set::Union<'a, T>impl<'a, K, V> Clone for std::collections::btree_map::Range<'a, K, V>impl<T> Clone for LinkedList<T> where
T: Clone,impl Clone for ExchangeHeapSingletonimpl<T> Clone for std::vec::IntoIter<T> where
T: Clone,impl<'a, T> Clone for std::collections::btree_set::Range<'a, T>impl<'a, K, V> Clone for std::collections::btree_map::Keys<'a, K, V>impl<T> Clone for std::collections::linked_list::IntoIter<T> where
T: Clone,impl Clone for AllocErrimpl Clone for Heapimpl<T> Clone for BinaryHeap<T> where
T: Clone,impl<'a, T> Clone for std::collections::btree_set::Difference<'a, T>impl<T> Clone for std::rc::Weak<T> where
T: ?Sized,impl<'a, T> Clone for std::collections::binary_heap::Iter<'a, T>impl<'a, T> Clone for std::collections::btree_set::SymmetricDifference<'a, T>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 std::collections::vec_deque::IntoIter<T> where
T: Clone,impl<'a, B> Clone for Cow<'a, B> where
B: ToOwned + ?Sized,impl Clone for ParseErrorimpl<'a, T> Clone for std::collections::linked_list::Iter<'a, T>impl<T> Clone for std::sync::Weak<T> where
T: ?Sized,impl<T> Clone for Bound<T> where
T: Clone,impl<K, V> Clone for BTreeMap<K, V> where
K: Clone,
V: Clone,impl Clone for Stringimpl Clone for TypeIdimpl<'a> Clone for Bytes<'a>impl<'a, T, P> Clone for std::slice::RSplit<'a, T, P> where
P: Clone + FnMut(&T) -> bool,
T: 'a + Clone,impl<'a, F> Clone for CharPredicateSearcher<'a, F> where
F: Clone + FnMut(char) -> bool,impl<T> Clone for RefCell<T> where
T: Clone,impl<'a, P> Clone for RSplitN<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<Idx> Clone for RangeInclusive<Idx> where
Idx: Clone,impl Clone for TryFromIntErrorimpl<A, B> Clone for Chain<A, B> where
A: Clone,
B: Clone,impl<I, P> Clone for SkipWhile<I, P> where
I: Clone,
P: Clone,impl<'a, P> Clone for MatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I, P> Clone for TakeWhile<I, P> where
I: Clone,
P: Clone,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 Clone for std::sync::atomic::Orderingimpl<'a, P> Clone for RMatches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<Idx> Clone for RangeToInclusive<Idx> where
Idx: Clone,impl Clone for Infallibleimpl<H> Clone for BuildHasherDefault<H>impl Clone for ParseFloatErrorimpl Clone for SearchStepimpl<'a> Clone for Lines<'a>impl Clone for SipHasher24impl<'a> Clone for CharSearcher<'a>impl<I, F> Clone for Map<I, F> where
F: Clone,
I: Clone,impl Clone for ParseIntErrorimpl Clone for ParseCharErrorimpl<A> Clone for Repeat<A> where
A: Clone,impl<T> Clone for PhantomData<T> where
T: ?Sized,impl<T> Clone for Discriminant<T>impl<'a, P> Clone for SplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a, T> Clone for std::slice::Iter<'a, T>impl Clone for RangeFullimpl<T> Clone for Rev<T> where
T: Clone,impl<'a, T> Clone for Chunks<'a, T>impl<'a, A> Clone for std::option::Iter<'a, A>impl Clone for TraitObjectimpl<Y, R> Clone for GeneratorState<Y, R> where
R: Clone,
Y: Clone,impl<T> Clone for Empty<T>impl<I> Clone for Skip<I> where
I: Clone,impl<I> Clone for Take<I> where
I: Clone,impl<'a> Clone for LinesAny<'a>impl<I, F> Clone for Inspect<I, F> where
F: Clone,
I: Clone,impl Clone for std::cmp::Orderingimpl<Idx> Clone for std::ops::Range<Idx> where
Idx: Clone,impl<T> Clone for std::result::IntoIter<T> where
T: 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, 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<T> Clone for ManuallyDrop<T> where
T: Clone,impl Clone for ParseBoolErrorimpl<'a, P> Clone for RSplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<T> Clone for Wrapping<T> where
T: Clone,impl Clone for SipHasherimpl<'a, P> Clone for std::str::Split<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for SipHasher13impl<Idx> Clone for RangeFrom<Idx> where
Idx: Clone,impl<'a> Clone for Chars<'a>impl<I> Clone for DecodeUtf8<I> where
I: Clone + Iterator<Item = u8>,impl<'a, 'b> Clone for StrSearcher<'a, 'b>impl<A, B> Clone for Zip<A, B> where
A: Clone,
B: Clone,impl Clone for EscapeUnicodeimpl<I> Clone for Cloned<I> where
I: Clone,impl Clone for EscapeDefaultimpl<I, St, F> Clone for Scan<I, St, F> where
F: Clone,
I: Clone,
St: Clone,impl Clone for NoneErrorimpl<T> Clone for Shared<T> where
T: ?Sized,impl<T> Clone for Unique<T> where
T: ?Sized,impl<'a, P> Clone for SplitN<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I> Clone for Cycle<I> where
I: Clone,impl<I> Clone for Peekable<I> where
I: Clone + Iterator,
<I as Iterator>::Item: Clone,impl Clone for Utf8Errorimpl<I> Clone for Fuse<I> where
I: Clone,impl<'a, T> Clone for Windows<'a, T>impl<T, E> Clone for Result<T, E> where
E: Clone,
T: Clone,impl<'a> Clone for Arguments<'a>impl Clone for CharTryFromErrorimpl<I> Clone for Enumerate<I> where
I: Clone,impl<'a> Clone for CharIndices<'a>impl<Idx> Clone for RangeTo<Idx> where
Idx: Clone,impl<'a, 'b> Clone for CharSliceSearcher<'a, 'b>impl<T> Clone for Once<T> where
T: Clone,impl<T> Clone for Option<T> where
T: Clone,impl Clone for Errorimpl Clone for FpCategoryimpl<T> Clone for Cell<T> where
T: Copy,impl<A> Clone for std::option::IntoIter<A> where
A: Clone,impl<'a, T> Clone for std::result::Iter<'a, T>impl<I> Clone for StepBy<I> where
I: Clone,impl Clone for EscapeDebugimpl<'a, T, P> Clone for std::slice::Split<'a, T, P> where
P: Clone + FnMut(&T) -> bool,impl<'a, P> Clone for RMatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,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 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