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