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