Trait kvarn_async::prelude::compact_str::core::clone::Clone
1.0.0 · source · pub trait Clone: Sized {
// Required method
fn clone(&self) -> Self;
// Provided method
fn clone_from(&mut self, source: &Self) { ... }
}
Expand description
A common trait for the ability to explicitly duplicate an object.
Differs from Copy
in that Copy
is implicit and an inexpensive bit-wise copy, 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 derive
d
implementation of Clone
calls clone
on each field.
For a generic struct, #[derive]
implements Clone
conditionally by adding bound Clone
on
generic parameters.
// `derive` implements Clone for Reading<T> when T is Clone.
#[derive(Clone)]
struct Reading<T> {
frequency: T,
}
§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 a generic struct holding a function pointer. In this case, the
implementation of Clone
cannot be derive
d, but can be implemented as:
struct Generate<T>(fn() -> T);
impl<T> Copy for Generate<T> {}
impl<T> Clone for Generate<T> {
fn clone(&self) -> Self {
*self
}
}
If we derive
:
#[derive(Copy, Clone)]
struct Generate<T>(fn() -> T);
the auto-derived implementations will have unnecessary T: Copy
and T: Clone
bounds:
// Automatically derived
impl<T: Copy> Copy for Generate<T> { }
// Automatically derived
impl<T: Clone> Clone for Generate<T> {
fn clone(&self) -> Generate<T> {
Generate(Clone::clone(&self.0))
}
}
The bounds are unnecessary because clearly the function itself should be copy- and cloneable even if its return type is not:
#[derive(Copy, Clone)]
struct Generate<T>(fn() -> T);
struct NotCloneable;
fn generate_not_cloneable() -> NotCloneable {
NotCloneable
}
Generate(generate_not_cloneable).clone(); // error: trait bounds were not satisfied
// Note: With the manual implementations the above line will compile.
§Additional implementors
In addition to the implementors listed below,
the following types also implement Clone
:
- Function item types (i.e., the distinct types defined for each function)
- Function pointer types (e.g.,
fn() -> i32
) - Closure types, if they capture no value from the environment
or if all such captured values implement
Clone
themselves. Note that variables captured by shared reference always implementClone
(even if the referent doesn’t), while variables captured by mutable reference never implementClone
.
Required Methods§
Provided Methods§
sourcefn clone_from(&mut self, source: &Self)
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.
Object Safety§
Implementors§
impl Clone for IpAddr
impl Clone for kvarn_async::prelude::SocketAddr
impl Clone for kvarn_async::prelude::fmt::Alignment
impl Clone for ErrorKind
impl Clone for SeekFrom
impl Clone for Ipv6MulticastScope
impl Clone for Shutdown
impl Clone for CacheControlError
impl Clone for SanitizeError
impl Clone for AsciiChar
impl Clone for kvarn_async::prelude::compact_str::core::cmp::Ordering
impl Clone for Infallible
impl Clone for FpCategory
impl Clone for IntErrorKind
impl Clone for SearchStep
impl Clone for kvarn_async::prelude::compact_str::core::sync::atomic::Ordering
impl Clone for TryReserveErrorKind
impl Clone for VarError
impl Clone for BacktraceStyle
impl Clone for RecvTimeoutError
impl Clone for std::sync::mpsc::TryRecvError
impl Clone for _Unwind_Action
impl Clone for _Unwind_Reason_Code
impl Clone for Level
impl Clone for LevelFilter
impl Clone for tokio::sync::broadcast::error::RecvError
impl Clone for tokio::sync::broadcast::error::TryRecvError
impl Clone for tokio::sync::mpsc::error::TryRecvError
impl Clone for tokio::sync::oneshot::error::TryRecvError
impl Clone for MissedTickBehavior
impl Clone for bool
impl Clone for char
impl Clone for f32
impl Clone for f64
impl Clone for i8
impl Clone for i16
impl Clone for i32
impl Clone for i64
impl Clone for i128
impl Clone for isize
impl Clone for !
impl Clone for u8
impl Clone for u16
impl Clone for u32
impl Clone for u64
impl Clone for u128
impl Clone for usize
impl Clone for PresentExtensions
impl Clone for kvarn_async::prelude::fmt::Error
impl Clone for kvarn_async::prelude::io::Empty
impl Clone for Sink
impl Clone for AddrParseError
impl Clone for Ipv4Addr
impl Clone for Ipv6Addr
impl Clone for SocketAddrV4
impl Clone for SocketAddrV6
impl Clone for CacheControl
impl Clone for ParseBoolError
impl Clone for Utf8Error
impl Clone for kvarn_async::prelude::Bytes
impl Clone for BytesMut
impl Clone for CompactString
impl Clone for Duration
impl Clone for HeaderName
impl Clone for HeaderValue
impl Clone for kvarn_async::prelude::Instant
impl Clone for Method
impl Clone for PathBuf
impl Clone for StatusCode
impl Clone for Uri
impl Clone for Version
impl Clone for Authority
impl Clone for PathAndQuery
impl Clone for Scheme
impl Clone for Utf16Error
impl Clone for AllocError
impl Clone for Layout
impl Clone for LayoutError
impl Clone for TypeId
impl Clone for CpuidResult
impl Clone for __m128
impl Clone for __m128bh
impl Clone for __m128d
impl Clone for __m128i
impl Clone for __m256
impl Clone for __m256bh
impl Clone for __m256d
impl Clone for __m256i
impl Clone for __m512
impl Clone for __m512bh
impl Clone for __m512d
impl Clone for __m512i
impl Clone for TryFromSliceError
impl Clone for kvarn_async::prelude::compact_str::core::ascii::EscapeDefault
impl Clone for CharTryFromError
impl Clone for DecodeUtf16Error
impl Clone for kvarn_async::prelude::compact_str::core::char::EscapeDebug
impl Clone for kvarn_async::prelude::compact_str::core::char::EscapeDefault
impl Clone for kvarn_async::prelude::compact_str::core::char::EscapeUnicode
impl Clone for ParseCharError
impl Clone for ToLowercase
impl Clone for ToUppercase
impl Clone for TryFromCharError
impl Clone for FromBytesUntilNulError
impl Clone for FromBytesWithNulError
impl Clone for SipHasher
impl Clone for PhantomPinned
impl Clone for Assume
impl Clone for NonZero<i8>
impl Clone for NonZero<i16>
impl Clone for NonZero<i32>
impl Clone for NonZero<i64>
impl Clone for NonZero<i128>
impl Clone for NonZero<isize>
impl Clone for NonZero<u8>
impl Clone for NonZero<u16>
impl Clone for NonZero<u32>
impl Clone for NonZero<u64>
impl Clone for NonZero<u128>
impl Clone for NonZero<usize>
impl Clone for ParseFloatError
impl Clone for ParseIntError
impl Clone for TryFromIntError
impl Clone for RangeFull
impl Clone for kvarn_async::prelude::compact_str::core::ptr::Alignment
impl Clone for TimSortRun
impl Clone for RawWakerVTable
impl Clone for Waker
impl Clone for TryFromFloatSecsError
impl Clone for Global
impl Clone for Box<str>
impl Clone for Box<Path>
impl Clone for Box<CStr>
impl Clone for Box<OsStr>
impl Clone for Box<dyn AnyClone + Send + Sync>
impl Clone for UnorderedKeyError
impl Clone for TryReserveError
impl Clone for CString
impl Clone for FromVecWithNulError
impl Clone for IntoStringError
impl Clone for NulError
impl Clone for FromUtf8Error
impl Clone for String
impl Clone for System
impl Clone for OsString
impl Clone for FileTimes
impl Clone for FileType
impl Clone for std::fs::Metadata
impl Clone for std::fs::OpenOptions
impl Clone for Permissions
impl Clone for DefaultHasher
impl Clone for RandomState
impl Clone for std::os::macos::raw::stat
impl Clone for std::os::unix::net::addr::SocketAddr
impl Clone for UCred
impl Clone for StripPrefixError
impl Clone for ExitCode
impl Clone for ExitStatus
impl Clone for ExitStatusError
impl Clone for Output
impl Clone for std::sync::condvar::WaitTimeoutResult
impl Clone for std::sync::mpsc::RecvError
impl Clone for AccessError
impl Clone for Thread
impl Clone for ThreadId
impl Clone for SystemTime
impl Clone for SystemTimeError
impl Clone for Extensions
impl Clone for http::request::Parts
impl Clone for http::response::Parts
impl Clone for itoa::Buffer
impl Clone for ryu::buffer::Buffer
impl Clone for tokio::fs::open_options::OpenOptions
impl Clone for Handle
impl Clone for BarrierWaitResult
impl Clone for tokio::sync::oneshot::error::RecvError
impl Clone for tokio::sync::watch::error::RecvError
impl Clone for tokio::time::error::Error
impl Clone for tokio::time::instant::Instant
impl Clone for Dl_info
impl Clone for FilterOp
impl Clone for OnceState
impl Clone for ParkResult
impl Clone for ParkToken
impl Clone for RequeueOp
impl Clone for UnparkResult
impl Clone for UnparkToken
impl Clone for WaitTimeoutResult
impl Clone for __c_anonymous_ifc_ifcu
impl Clone for __c_anonymous_ifk_data
impl Clone for __c_anonymous_ifr_ifru
impl Clone for __darwin_mcontext64
impl Clone for __darwin_mmst_reg
impl Clone for __darwin_x86_exception_state64
impl Clone for __darwin_x86_float_state64
impl Clone for __darwin_x86_thread_state64
impl Clone for __darwin_xmm_reg
impl Clone for addrinfo
impl Clone for aiocb
impl Clone for arphdr
impl Clone for attribute_set_t
impl Clone for attrlist
impl Clone for attrreference_t
impl Clone for bpf_hdr
impl Clone for cmsghdr
impl Clone for ctl_info
impl Clone for dirent
impl Clone for dqblk
impl Clone for fd_set
impl Clone for flock
impl Clone for fpunchhole_t
impl Clone for fsid_t
impl Clone for fspecread_t
impl Clone for fstore_t
impl Clone for ftrimactivefile_t
impl Clone for glob_t
impl Clone for group
impl Clone for hostent
impl Clone for if_data
impl Clone for if_data64
impl Clone for if_msghdr
impl Clone for if_msghdr2
impl Clone for if_nameindex
impl Clone for ifa_msghdr
impl Clone for ifaddrs
impl Clone for ifconf
impl Clone for ifdevmtu
impl Clone for ifkpi
impl Clone for ifma_msghdr
impl Clone for ifma_msghdr2
impl Clone for ifreq
impl Clone for image_offset
impl Clone for in6_addr
impl Clone for in6_pktinfo
impl Clone for in_addr
impl Clone for in_pktinfo
impl Clone for iovec
impl Clone for ip_mreq
impl Clone for ip_mreq_source
impl Clone for ip_mreqn
impl Clone for ipc_perm
impl Clone for ipv6_mreq
impl Clone for itimerval
impl Clone for kevent
impl Clone for kevent64_s
impl Clone for lconv
impl Clone for linger
impl Clone for load_command
impl Clone for log2phys
impl Clone for mach_header
impl Clone for mach_header_64
impl Clone for mach_task_basic_info
impl Clone for mach_timebase_info
impl Clone for malloc_introspection_t
impl Clone for malloc_statistics_t
impl Clone for malloc_zone_t
impl Clone for max_align_t
impl Clone for msghdr
impl Clone for mstats
impl Clone for ntptimeval
impl Clone for option
impl Clone for os_unfair_lock_s
impl Clone for passwd
impl Clone for pollfd
impl Clone for proc_bsdinfo
impl Clone for proc_taskallinfo
impl Clone for proc_taskinfo
impl Clone for proc_threadinfo
impl Clone for proc_vnodepathinfo
impl Clone for processor_basic_info
impl Clone for processor_cpu_load_info
impl Clone for processor_set_basic_info
impl Clone for processor_set_load_info
impl Clone for protoent
impl Clone for pthread_attr_t
impl Clone for pthread_cond_t
impl Clone for pthread_condattr_t
impl Clone for pthread_mutex_t
impl Clone for pthread_mutexattr_t
impl Clone for pthread_rwlock_t
impl Clone for pthread_rwlockattr_t
impl Clone for qos_class_t
impl Clone for radvisory
impl Clone for regex_t
impl Clone for regmatch_t
impl Clone for rlimit
impl Clone for rt_metrics
impl Clone for rt_msghdr
impl Clone for rt_msghdr2
impl Clone for rusage
impl Clone for rusage_info_v0
impl Clone for rusage_info_v1
impl Clone for rusage_info_v2
impl Clone for rusage_info_v3
impl Clone for rusage_info_v4
impl Clone for sa_endpoints_t
impl Clone for sched_param
impl Clone for segment_command
impl Clone for segment_command_64
impl Clone for sembuf
impl Clone for semid_ds
impl Clone for semun
impl Clone for servent
impl Clone for sf_hdtr
impl Clone for shmid_ds
impl Clone for sigaction
impl Clone for sigevent
impl Clone for siginfo_t
impl Clone for sigval
impl Clone for sockaddr
impl Clone for sockaddr_ctl
impl Clone for sockaddr_dl
impl Clone for sockaddr_in
impl Clone for sockaddr_in6
impl Clone for sockaddr_inarp
impl Clone for sockaddr_ndrv
impl Clone for sockaddr_storage
impl Clone for sockaddr_un
impl Clone for sockaddr_vm
impl Clone for stack_t
impl Clone for stat
impl Clone for statfs
impl Clone for statvfs
impl Clone for sysdir_search_path_directory_t
impl Clone for sysdir_search_path_domain_mask_t
impl Clone for task_thread_times_info
impl Clone for tcp_connection_info
impl Clone for termios
impl Clone for thread_affinity_policy
impl Clone for thread_background_policy
impl Clone for thread_basic_info
impl Clone for thread_extended_info
impl Clone for thread_extended_policy
impl Clone for thread_identifier_info
impl Clone for thread_latency_qos_policy
impl Clone for thread_precedence_policy
impl Clone for thread_standard_policy
impl Clone for thread_throughput_qos_policy
impl Clone for thread_time_constraint_policy
impl Clone for time_value_t
impl Clone for timespec
impl Clone for timeval
impl Clone for timeval32
impl Clone for timex
impl Clone for timezone
impl Clone for tm
impl Clone for tms
impl Clone for ucontext_t
impl Clone for utimbuf
impl Clone for utmpx
impl Clone for utsname
impl Clone for vinfo_stat
impl Clone for vm_range_t
impl Clone for vm_statistics
impl Clone for vm_statistics64
impl Clone for vnode_info
impl Clone for vnode_info_path
impl Clone for vol_attributes_attr_t
impl Clone for vol_capabilities_attr_t
impl Clone for winsize
impl Clone for xsw_usage
impl Clone for xucred
impl<'a> Clone for Component<'a>
impl<'a> Clone for Prefix<'a>
impl<'a> Clone for Arguments<'a>
impl<'a> Clone for IoSlice<'a>
impl<'a> Clone for kvarn_async::prelude::str::Bytes<'a>
impl<'a> Clone for CharIndices<'a>
impl<'a> Clone for Chars<'a>
impl<'a> Clone for EncodeUtf16<'a>
impl<'a> Clone for kvarn_async::prelude::str::EscapeDebug<'a>
impl<'a> Clone for kvarn_async::prelude::str::EscapeDefault<'a>
impl<'a> Clone for kvarn_async::prelude::str::EscapeUnicode<'a>
impl<'a> Clone for Lines<'a>
impl<'a> Clone for LinesAny<'a>
impl<'a> Clone for SplitAsciiWhitespace<'a>
impl<'a> Clone for SplitWhitespace<'a>
impl<'a> Clone for Utf8Chunk<'a>
impl<'a> Clone for Utf8Chunks<'a>
impl<'a> Clone for Source<'a>
impl<'a> Clone for Location<'a>
impl<'a> Clone for EscapeAscii<'a>
impl<'a> Clone for CharSearcher<'a>
impl<'a> Clone for Ancestors<'a>
impl<'a> Clone for Components<'a>
impl<'a> Clone for std::path::Iter<'a>
impl<'a> Clone for PrefixComponent<'a>
impl<'a> Clone for QuotedStrSplitIter<'a>
impl<'a> Clone for log::Metadata<'a>
impl<'a> Clone for Record<'a>
impl<'a> Clone for PercentDecode<'a>
impl<'a> Clone for PercentEncode<'a>
impl<'a, 'b> Clone for CharSliceSearcher<'a, 'b>
impl<'a, 'b> Clone for StrSearcher<'a, 'b>
impl<'a, 'b, const N: usize> Clone for CharArrayRefSearcher<'a, 'b, N>
impl<'a, F> Clone for CharPredicateSearcher<'a, F>
impl<'a, P> Clone for MatchIndices<'a, P>
impl<'a, P> Clone for Matches<'a, P>
impl<'a, P> Clone for RMatchIndices<'a, P>
impl<'a, P> Clone for RMatches<'a, P>
impl<'a, P> Clone for kvarn_async::prelude::str::RSplit<'a, P>
impl<'a, P> Clone for RSplitN<'a, P>
impl<'a, P> Clone for RSplitTerminator<'a, P>
impl<'a, P> Clone for kvarn_async::prelude::str::Split<'a, P>
impl<'a, P> Clone for kvarn_async::prelude::str::SplitInclusive<'a, P>
impl<'a, P> Clone for SplitN<'a, P>
impl<'a, P> Clone for SplitTerminator<'a, P>
impl<'a, T> Clone for RChunksExact<'a, T>
impl<'a, T, const N: usize> Clone for ArrayWindows<'a, T, N>where
T: Clone + 'a,
impl<'a, const N: usize> Clone for CharArraySearcher<'a, N>
impl<'f> Clone for VaListImpl<'f>
impl<'fd> Clone for BorrowedFd<'fd>
impl<A> Clone for Repeat<A>where
A: Clone,
impl<A> Clone for RepeatN<A>where
A: Clone,
impl<A> Clone for kvarn_async::prelude::compact_str::core::option::IntoIter<A>where
A: Clone,
impl<A> Clone for kvarn_async::prelude::compact_str::core::option::Iter<'_, A>
impl<A> Clone for IntoIter<A>
impl<A> Clone for SmallVec<A>where
A: Array,
<A as Array>::Item: Clone,
impl<A, B> Clone for Chain<A, B>
impl<A, B> Clone for Zip<A, B>
impl<B> Clone for Cow<'_, B>
impl<B, C> Clone for ControlFlow<B, C>
impl<Dyn> Clone for DynMetadata<Dyn>where
Dyn: ?Sized,
impl<F> Clone for FromFn<F>where
F: Clone,
impl<F> Clone for OnceWith<F>where
F: Clone,
impl<F> Clone for RepeatWith<F>where
F: Clone,
impl<H> Clone for BuildHasherDefault<H>
impl<I> Clone for FromIter<I>where
I: Clone,
impl<I> Clone for DecodeUtf16<I>
impl<I> Clone for Cloned<I>where
I: Clone,
impl<I> Clone for Copied<I>where
I: Clone,
impl<I> Clone for Cycle<I>where
I: Clone,
impl<I> Clone for Enumerate<I>where
I: Clone,
impl<I> Clone for Fuse<I>where
I: Clone,
impl<I> Clone for Intersperse<I>
impl<I> Clone for Peekable<I>
impl<I> Clone for Skip<I>where
I: Clone,
impl<I> Clone for StepBy<I>where
I: Clone,
impl<I> Clone for Take<I>where
I: Clone,
impl<I, F> Clone for FilterMap<I, F>
impl<I, F> Clone for Inspect<I, F>
impl<I, F> Clone for Map<I, F>
impl<I, F, const N: usize> Clone for MapWindows<I, F, N>
impl<I, G> Clone for IntersperseWith<I, G>
impl<I, P> Clone for Filter<I, P>
impl<I, P> Clone for MapWhile<I, P>
impl<I, P> Clone for SkipWhile<I, P>
impl<I, P> Clone for TakeWhile<I, P>
impl<I, St, F> Clone for Scan<I, St, F>
impl<I, U> Clone for Flatten<I>
impl<I, U, F> Clone for FlatMap<I, U, F>
impl<I, const N: usize> Clone for kvarn_async::prelude::compact_str::core::iter::ArrayChunks<I, N>
impl<Idx> Clone for kvarn_async::prelude::compact_str::core::ops::Range<Idx>where
Idx: Clone,
impl<Idx> Clone for RangeFrom<Idx>where
Idx: Clone,
impl<Idx> Clone for RangeInclusive<Idx>where
Idx: Clone,
impl<Idx> Clone for RangeTo<Idx>where
Idx: Clone,
impl<Idx> Clone for RangeToInclusive<Idx>where
Idx: Clone,
impl<K> Clone for std::collections::hash::set::Iter<'_, K>
impl<K, V> Clone for alloc::collections::btree::map::Cursor<'_, K, V>
impl<K, V> Clone for alloc::collections::btree::map::Iter<'_, K, V>
impl<K, V> Clone for alloc::collections::btree::map::Keys<'_, K, V>
impl<K, V> Clone for alloc::collections::btree::map::Range<'_, K, V>
impl<K, V> Clone for alloc::collections::btree::map::Values<'_, K, V>
impl<K, V> Clone for std::collections::hash::map::Iter<'_, K, V>
impl<K, V> Clone for std::collections::hash::map::Keys<'_, K, V>
impl<K, V> Clone for std::collections::hash::map::Values<'_, K, V>
impl<K, V, A> Clone for BTreeMap<K, V, A>
impl<K, V, S> Clone for HashMap<K, V, S>
impl<Ptr> Clone for Pin<Ptr>where
Ptr: Clone,
impl<T> !Clone for &mut Twhere
T: ?Sized,
Shared references can be cloned, but mutable references cannot!
impl<T> Clone for Bound<T>where
T: Clone,
impl<T> Clone for Option<T>where
T: Clone,
impl<T> Clone for Poll<T>where
T: Clone,
impl<T> Clone for std::sync::mpsc::TrySendError<T>where
T: Clone,
impl<T> Clone for SendTimeoutError<T>where
T: Clone,
impl<T> Clone for tokio::sync::mpsc::error::TrySendError<T>where
T: Clone,
impl<T> Clone for *const Twhere
T: ?Sized,
impl<T> Clone for *mut Twhere
T: ?Sized,
impl<T> Clone for &Twhere
T: ?Sized,
Shared references can be cloned, but mutable references cannot!