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<T> Clone for NonZero<T> where
T: Zeroable + Clone, [src]
T: Zeroable + Clone,
impl Clone for TryFromSliceError[src]
fn clone(&self) -> TryFromSliceError[src]
fn clone_from(&mut self, source: &Self)1.0.0[src]
Implementors
impl Clone for DecodeUtf16Errorimpl<I> Clone for DecodeUtf16<I> where
I: Clone + Iterator<Item = u16>,impl Clone for UnicodeVersionimpl<'a> Clone for SplitWhitespace<'a>impl Clone for CannotReallocInPlaceimpl<'a, T> Clone for std::collections::btree_set::Difference<'a, T>impl<T> Clone for std::collections::vec_deque::IntoIter<T> where
T: Clone,impl<T> Clone for Bound<T> where
T: Clone,impl<T> Clone for Box<T> where
T: Clone,impl<T> Clone for std::vec::IntoIter<T> where
T: Clone,impl<T> Clone for Rc<T> where
T: ?Sized,impl<'a, T> Clone for std::collections::btree_set::SymmetricDifference<'a, T>impl<T> Clone for LinkedList<T> where
T: Clone,impl Clone for Heapimpl<'a, K, V> Clone for std::collections::btree_map::Keys<'a, K, V>impl<'a, K, V> Clone for std::collections::btree_map::Iter<'a, K, V>impl<T> Clone for BinaryHeap<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::Union<'a, T>impl<'a, T> Clone for std::collections::btree_set::Intersection<'a, T>impl<'a, K, V> Clone for std::collections::btree_map::Values<'a, K, V>impl<T> Clone for std::rc::Weak<T> where
T: ?Sized,impl<T> Clone for std::collections::binary_heap::IntoIter<T> where
T: Clone,impl<T> Clone for VecDeque<T> where
T: Clone,impl<T> Clone for BTreeSet<T> where
T: Clone,impl Clone for Box<str>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<T> Clone for Arc<T> where
T: ?Sized,impl<T> Clone for std::collections::linked_list::IntoIter<T> where
T: Clone,impl<'a, K, V> Clone for std::collections::btree_map::Range<'a, K, V>impl<'a> Clone for EncodeUtf16<'a>impl<K, V> Clone for BTreeMap<K, V> where
K: Clone,
V: Clone,impl<T> Clone for Vec<T> where
T: Clone,impl Clone for AllocErrimpl Clone for ExchangeHeapSingletonimpl<'a, T> Clone for std::collections::binary_heap::Iter<'a, T>impl<T> Clone for std::sync::Weak<T> where
T: ?Sized,impl<T> Clone for Box<[T]> where
T: Clone,impl Clone for Stringimpl Clone for ParseErrorimpl Clone for Layoutimpl<'a, T> Clone for std::collections::btree_set::Range<'a, T>impl<'a, B> Clone for Cow<'a, B> where
B: ToOwned + ?Sized,impl Clone for std::cmp::Orderingimpl<'a, T> Clone for std::slice::Iter<'a, T>impl<'a, A> Clone for std::option::Iter<'a, A>impl<I> Clone for Peekable<I> where
I: Clone + Iterator,
<I as Iterator>::Item: Clone,impl<I, F> Clone for Inspect<I, F> where
F: Clone,
I: Clone,impl<'a, P> Clone for RSplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a> Clone for Bytes<'a>impl<'a, 'b> Clone for CharSliceSearcher<'a, 'b>impl Clone for ParseFloatErrorimpl Clone for SipHasher13impl<I> Clone for Skip<I> where
I: Clone,impl<T> Clone for Unique<T> where
T: ?Sized,impl<'a, P> Clone for MatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl Clone for ParseBoolErrorimpl<'a> Clone for LinesAny<'a>impl<'a> Clone for CharIndices<'a>impl<T> Clone for RefCell<T> where
T: Clone,impl<T> Clone for ManuallyDrop<T> where
T: Clone,impl<I> Clone for StepBy<I> where
I: Clone,impl Clone for std::sync::atomic::Orderingimpl<'a, P> Clone for RMatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<'a> Clone for Chars<'a>impl<'a, T> Clone for std::result::Iter<'a, T>impl Clone for TypeIdimpl<'a, T> Clone for Windows<'a, T>impl<I> Clone for Fuse<I> where
I: Clone,impl Clone for Utf8Errorimpl<'a, P> Clone for std::str::RSplit<'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 Errorimpl<'a> Clone for CharSearcher<'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<'a> Clone for Arguments<'a>impl Clone for TraitObjectimpl<A> Clone for Repeat<A> where
A: Clone,impl<'a, P> Clone for RMatches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<T> Clone for std::result::IntoIter<T> where
T: Clone,impl Clone for EscapeUnicodeimpl Clone for ParseCharErrorimpl<Idx> Clone for std::ops::Range<Idx> where
Idx: Clone,impl<A> Clone for std::option::IntoIter<A> where
A: Clone,impl<T> Clone for Wrapping<T> where
T: Clone,impl<'a, 'b> Clone for StrSearcher<'a, 'b>impl<'a, P> Clone for std::str::Split<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I, F> Clone for Map<I, F> where
F: Clone,
I: Clone,impl<'a, T> Clone for Chunks<'a, T>impl<T> Clone for Rev<T> where
T: 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, P> Clone for TakeWhile<I, P> where
I: Clone,
P: Clone,impl Clone for SipHasherimpl Clone for SearchStepimpl<I> Clone for Take<I> where
I: Clone,impl<T> Clone for Discriminant<T>impl<T> Clone for Shared<T> where
T: ?Sized,impl<T, E> Clone for Result<T, E> where
E: Clone,
T: Clone,impl Clone for NoneErrorimpl Clone for EscapeDefaultimpl<Idx> Clone for RangeFrom<Idx> where
Idx: Clone,impl Clone for CharTryFromErrorimpl<Idx> Clone for RangeTo<Idx> where
Idx: Clone,impl<T> Clone for Once<T> where
T: Clone,impl<I, P> Clone for Filter<I, P> where
I: Clone,
P: Clone,impl Clone for TryFromIntErrorimpl<Y, R> Clone for GeneratorState<Y, R> where
R: Clone,
Y: Clone,impl Clone for RangeFullimpl<'a, P> Clone for SplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I> Clone for Enumerate<I> where
I: Clone,impl<'a, T, P> Clone for std::slice::Split<'a, T, P> where
P: Clone + FnMut(&T) -> bool,impl<Idx> Clone for RangeToInclusive<Idx> where
Idx: Clone,impl Clone for EscapeDebugimpl<A, B> Clone for Zip<A, B> where
A: Clone,
B: Clone,impl<T> Clone for Option<T> where
T: Clone,impl<'a, P> Clone for Matches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<I, St, F> Clone for Scan<I, St, F> where
F: Clone,
I: Clone,
St: Clone,impl<I> Clone for Cycle<I> where
I: Clone,impl<T> Clone for Empty<T>impl Clone for ParseIntErrorimpl<H> Clone for BuildHasherDefault<H>impl<Idx> Clone for RangeInclusive<Idx> where
Idx: Clone,impl<I, F> Clone for FilterMap<I, F> where
F: Clone,
I: Clone,impl<'a, F> Clone for CharPredicateSearcher<'a, F> where
F: Clone + FnMut(char) -> bool,impl Clone for SipHasher24impl Clone for FpCategoryimpl<A, B> Clone for Chain<A, B> where
A: Clone,
B: Clone,impl<I> Clone for Cloned<I> where
I: Clone,impl<I> Clone for DecodeUtf8<I> where
I: Clone + Iterator<Item = u8>,impl<I, P> Clone for SkipWhile<I, P> where
I: Clone,
P: Clone,impl<T> Clone for Cell<T> where
T: Copy,impl<'a, P> Clone for SplitN<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: Clone,impl<T> Clone for PhantomData<T> where
T: ?Sized,impl Clone for Infallibleimpl 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