pub trait Copy: Clone { }
miri-test-libstd
only.Expand description
Types whose values can be duplicated simply by copying bits.
By default, variable bindings have ‘move semantics.’ In other words:
#[derive(Debug)]
struct Foo;
let x = Foo;
let y = x;
// `x` has moved into `y`, and so cannot be used
// println!("{x:?}"); // error: use of moved value
However, if a type implements Copy
, it instead has ‘copy semantics’:
// We can derive a `Copy` implementation. `Clone` is also required, as it's
// a supertrait of `Copy`.
#[derive(Debug, Copy, Clone)]
struct Foo;
let x = Foo;
let y = x;
// `y` is a copy of `x`
println!("{x:?}"); // A-OK!
It’s important to note that in these two examples, the only difference is whether you
are allowed to access x
after the assignment. Under the hood, both a copy and a move
can result in bits being copied in memory, although this is sometimes optimized away.
How can I implement Copy
?
There are two ways to implement Copy
on your type. The simplest is to use derive
:
#[derive(Copy, Clone)]
struct MyStruct;
You can also implement Copy
and Clone
manually:
struct MyStruct;
impl Copy for MyStruct { }
impl Clone for MyStruct {
fn clone(&self) -> MyStruct {
*self
}
}
There is a small difference between the two: the derive
strategy will also place a Copy
bound on type parameters, which isn’t always desired.
What’s the difference between Copy
and Clone
?
Copies happen implicitly, for example as part of an assignment y = x
. The behavior of
Copy
is not overloadable; it is always a simple bit-wise copy.
Cloning is an explicit action, x.clone()
. The implementation of Clone
can
provide any type-specific behavior necessary to duplicate values safely. For example,
the implementation of Clone
for String
needs to copy the pointed-to string
buffer in the heap. A simple bitwise copy of String
values would merely copy the
pointer, leading to a double free down the line. For this reason, String
is Clone
but not Copy
.
Clone
is a supertrait of Copy
, so everything which is Copy
must also implement
Clone
. If a type is Copy
then its Clone
implementation only needs to return *self
(see the example above).
When can my type be Copy
?
A type can implement Copy
if all of its components implement Copy
. For example, this
struct can be Copy
:
#[derive(Copy, Clone)]
struct Point {
x: i32,
y: i32,
}
A struct can be Copy
, and i32
is Copy
, therefore Point
is eligible to be Copy
.
By contrast, consider
struct PointList {
points: Vec<Point>,
}
The struct PointList
cannot implement Copy
, because Vec<T>
is not Copy
. If we
attempt to derive a Copy
implementation, we’ll get an error:
the trait `Copy` cannot be implemented for this type; field `points` does not implement `Copy`
Shared references (&T
) are also Copy
, so a type can be Copy
, even when it holds
shared references of types T
that are not Copy
. Consider the following struct,
which can implement Copy
, because it only holds a shared reference to our non-Copy
type PointList
from above:
#[derive(Copy, Clone)]
struct PointListWrapper<'a> {
point_list_ref: &'a PointList,
}
When can’t my type be Copy
?
Some types can’t be copied safely. For example, copying &mut T
would create an aliased
mutable reference. Copying String
would duplicate responsibility for managing the
String
’s buffer, leading to a double free.
Generalizing the latter case, any type implementing Drop
can’t be Copy
, because it’s
managing some resource besides its own size_of::<T>
bytes.
If you try to implement Copy
on a struct or enum containing non-Copy
data, you will get
the error E0204.
When should my type be Copy
?
Generally speaking, if your type can implement Copy
, it should. Keep in mind, though,
that implementing Copy
is part of the public API of your type. If the type might become
non-Copy
in the future, it could be prudent to omit the Copy
implementation now, to
avoid a breaking API change.
Additional implementors
In addition to the implementors listed below,
the following types also implement Copy
:
- 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
Copy
themselves. Note that variables captured by shared reference always implementCopy
(even if the referent doesn’t), while variables captured by mutable reference never implementCopy
.
Implementors§
impl Copy for CachePreferenceError
impl Copy for ClientCachePreference
impl Copy for CompressPreference
impl Copy for PreferredCompression
impl Copy for ServerCachePreference
impl Copy for BindIpVersion
impl Copy for CacheAction
impl Copy for kvarn::prelude::fmt::Alignment
impl Copy for kvarn::prelude::io::ErrorKind
impl Copy for SeekFrom
impl Copy for IpAddr
impl Copy for Ipv6MulticastScope
impl Copy for Shutdown
impl Copy for SocketAddr
impl Copy for SanitizeError
impl Copy for kvarn::prelude::compact_str::core::cmp::Ordering
impl Copy for Infallible
impl Copy for FpCategory
impl Copy for Which
impl Copy for SearchStep
impl Copy for kvarn::prelude::compact_str::core::sync::atomic::Ordering
impl Copy for webpki::error::Error
impl Copy for BacktraceStyle
impl Copy for std::sync::mpsc::RecvTimeoutError
impl Copy for std::sync::mpsc::TryRecvError
impl Copy for _Unwind_Action
impl Copy for _Unwind_Reason_Code
impl Copy for FlushCompress
impl Copy for FlushDecompress
impl Copy for Status
impl Copy for log::Level
impl Copy for log::LevelFilter
impl Copy for Sign
impl Copy for Directed
impl Copy for Direction
impl Copy for Undirected
impl Copy for Variant
impl Copy for uuid::Version
impl Copy for BernoulliError
impl Copy for WeightedError
impl Copy for bool
impl Copy for char
impl Copy for f32
impl Copy for f64
impl Copy for i8
impl Copy for i16
impl Copy for i32
impl Copy for i64
impl Copy for i128
impl Copy for isize
impl Copy for !
impl Copy for u8
impl Copy for u16
impl Copy for u32
impl Copy for u64
impl Copy for u128
impl Copy for usize
impl Copy for Id
impl Copy for OffsetDateTime
impl Copy for kvarn::prelude::fmt::Error
impl Copy for Empty
impl Copy for Sink
impl Copy for Ipv4Addr
impl Copy for Ipv6Addr
impl Copy for SocketAddrV4
impl Copy for SocketAddrV6
impl Copy for Utf8Error
impl Copy for kvarn::prelude::Instant
impl Copy for StatusCode
impl Copy for kvarn::prelude::Version
impl Copy for Utf16Error
impl Copy for AllocError
impl Copy for Layout
impl Copy for TypeId
impl Copy for CpuidResult
impl Copy for __m128
impl Copy for __m128bh
impl Copy for __m128d
impl Copy for __m128i
impl Copy for __m256
impl Copy for __m256bh
impl Copy for __m256d
impl Copy for __m256i
impl Copy for __m512
impl Copy for __m512bh
impl Copy for __m512d
impl Copy for __m512i
impl Copy for TryFromSliceError
impl Copy for CharTryFromError
impl Copy for TryFromCharError
impl Copy for Assume
impl Copy for NonZeroI8
impl Copy for NonZeroI16
impl Copy for NonZeroI32
impl Copy for NonZeroI64
impl Copy for NonZeroI128
impl Copy for NonZeroIsize
impl Copy for NonZeroU8
impl Copy for NonZeroU16
impl Copy for NonZeroU32
impl Copy for NonZeroU64
impl Copy for NonZeroU128
impl Copy for NonZeroUsize
impl Copy for TryFromIntError
impl Copy for RangeFull
impl Copy for kvarn::prelude::compact_str::core::ptr::Alignment
impl Copy for TimSortRun
impl Copy for RawWakerVTable
impl Copy for kvarn::prelude::compact_str::core::time::Duration
impl Copy for Digest
impl Copy for KeyRejected
impl Copy for Unspecified
impl Copy for ring::hkdf::Algorithm
impl Copy for ring::hmac::Algorithm
impl Copy for ring::hmac::Tag
impl Copy for ring::pbkdf2::Algorithm
impl Copy for Signature
impl Copy for EndOfInput
impl Copy for InvalidDnsNameError
impl Copy for AddrParseError
impl Copy for InvalidSubjectNameError
impl Copy for webpki::time::Time
impl Copy for Global
impl Copy for System
impl Copy for FileTimes
impl Copy for FileType
impl Copy for std::os::unix::ucred::UCred
impl Copy for ExitCode
impl Copy for ExitStatus
impl Copy for ExitStatusError
impl Copy for std::sync::condvar::WaitTimeoutResult
impl Copy for std::sync::mpsc::RecvError
impl Copy for AccessError
impl Copy for ThreadId
impl Copy for SystemTime
impl Copy for Adler32
impl Copy for flate2::Compression
impl Copy for getrandom::error::Error
impl Copy for Reason
impl Copy for StreamId
impl Copy for petgraph::visit::dfsvisit::Time
impl Copy for Buffer
impl Copy for Domain
impl Copy for Protocol
impl Copy for RecvFlags
impl Copy for Type
impl Copy for tracing_core::metadata::Level
impl Copy for tracing_core::metadata::LevelFilter
impl Copy for NoSubscriber
impl Copy for ATerm
impl Copy for B0
impl Copy for B1
impl Copy for Z0
impl Copy for Equal
impl Copy for Greater
impl Copy for Less
impl Copy for UTerm
impl Copy for Braced
impl Copy for Hyphenated
impl Copy for Simple
impl Copy for Urn
impl Copy for Uuid
impl Copy for NoContext
impl Copy for Timestamp
impl Copy for Bernoulli
impl Copy for Open01
impl Copy for OpenClosed01
impl Copy for Alphanumeric
impl Copy for Standard
impl Copy for UniformChar
impl Copy for UniformDuration
impl Copy for OsRng
impl Copy for PhantomPinned
impl Copy for ASN1Time
impl Copy for ASN1TimeZone
impl Copy for Aborted
impl Copy for AccessKind
impl Copy for AccessMode
impl Copy for AlertDescription
impl Copy for AlertLevel
impl Copy for BerClassFromIntError
impl Copy for BigEndian
impl Copy for BitOrder
impl Copy for BlockSwitch
impl Copy for BlockTypeCodeCalculator
impl Copy for BroCatliResult
impl Copy for BroccoliState
impl Copy for BrotliDecoderErrorCode
impl Copy for BrotliDistanceParams
impl Copy for BrotliEncoderMode
impl Copy for BrotliEncoderOperation
impl Copy for BrotliEncoderParameter
impl Copy for BrotliEncoderStreamState
impl Copy for BrotliHasherParams
impl Copy for BucketPopIndex
impl Copy for Builder
impl Copy for BytesCodec
impl Copy for Canceled
impl Copy for CapacityError
impl Copy for CertificateStatusType
impl Copy for CipherSuite
impl Copy for Class
impl Copy for ClientCertificateType
impl Copy for CloseCode
impl Copy for CodeBlockState
impl Copy for Command
impl Copy for Component
impl Copy for ComponentRange
impl Copy for Compression
impl Copy for CompressionLevel
impl Copy for CompressionStrategy
impl Copy for Config
impl Copy for ContentType
impl Copy for ContextType
impl Copy for Control
impl Copy for ConversionRange
impl Copy for CopyCommand
impl Copy for CreateKind
impl Copy for CtVersion
impl Copy for DIR
impl Copy for Data
impl Copy for DataChange
impl Copy for DataFormat
impl Copy for Date
impl Copy for DateKind
impl Copy for Day
impl Copy for DecodeError
impl Copy for DecodeKind
impl Copy for DecodePaddingMode
impl Copy for DecodePartial
impl Copy for DeliveryMode
impl Copy for DerConstraint
impl Copy for DestinationSlot
impl Copy for DictCommand
impl Copy for DictWord
impl Copy for DifferentVariant
impl Copy for Dl_info
impl Copy for Duration
impl Copy for ECCurveType
impl Copy for ECPointFormat
impl Copy for Eager
impl Copy for Elf32_Chdr
impl Copy for Elf32_Ehdr
impl Copy for Elf32_Phdr
impl Copy for Elf32_Shdr
impl Copy for Elf32_Sym
impl Copy for Elf64_Chdr
impl Copy for Elf64_Ehdr
impl Copy for Elf64_Phdr
impl Copy for Elf64_Shdr
impl Copy for Elf64_Sym
impl Copy for Endianness
impl Copy for Error
impl Copy for Error
impl Copy for Error
impl Copy for ErrorKind
impl Copy for EventKind
impl Copy for EventMask
impl Copy for ExtensionType
impl Copy for FILE
impl Copy for Fd
impl Copy for FileTime
impl Copy for FilterOp
impl Copy for Fixed
impl Copy for Flag
impl Copy for Flags
impl Copy for FormattedComponents
impl Copy for FsyncFlags
impl Copy for GeneralPurposeConfig
impl Copy for H9Opts
impl Copy for HandshakeType
impl Copy for HashAlgorithm
impl Copy for HeartbeatMessageType
impl Copy for HeartbeatMode
impl Copy for HistogramPair
impl Copy for Hour
impl Copy for HuffmanCode
impl Copy for HuffmanTree
impl Copy for Ignore
impl Copy for Incomplete
impl Copy for IndeterminateOffset
impl Copy for Instant
impl Copy for Instant
impl Copy for Interest
impl Copy for Interest
impl Copy for InvalidBufferSize
impl Copy for InvalidLength
impl Copy for InvalidMessage
impl Copy for InvalidOutputSize
impl Copy for InvalidVariant
impl Copy for IsFirst
impl Copy for KeyExchangeAlgorithm
impl Copy for KeyUpdateRequest
impl Copy for KeyUsage
impl Copy for Lazy
impl Copy for Length
impl Copy for LiteralBlockSwitch
impl Copy for LiteralPredictionModeNibble
impl Copy for LittleEndian
impl Copy for MZError
impl Copy for MZFlush
impl Copy for MZStatus
impl Copy for MetadataKind
impl Copy for MimeGuess
impl Copy for Minute
impl Copy for MissedTickBehavior
impl Copy for Mode
impl Copy for ModifyKind
impl Copy for Month
impl Copy for Month
impl Copy for MonthRepr
impl Copy for NSCertType
impl Copy for NamedCurve
impl Copy for NamedGroup
impl Copy for Needed
impl Copy for NoA1
impl Copy for NoA2
impl Copy for NoNI
impl Copy for NoS3
impl Copy for NoS4
impl Copy for Null
impl Copy for OffsetHour
impl Copy for OffsetMinute
impl Copy for OffsetPrecision
impl Copy for OffsetSecond
impl Copy for OnPoolDropBehavior
impl Copy for OnceState
impl Copy for OpCode
impl Copy for OpenHow
impl Copy for Ordinal
impl Copy for PDF
impl Copy for PSKKeyExchangeMode
impl Copy for Padding
impl Copy for ParkResult
impl Copy for ParkToken
impl Copy for Parse
impl Copy for ParseFromDescription
impl Copy for Parsed
impl Copy for Period
impl Copy for PollNext
impl Copy for PosData
impl Copy for Prefilter
impl Copy for PrettyPrinterFlag
impl Copy for PrimitiveDateTime
impl Copy for ProtocolVersion
impl Copy for Random
impl Copy for Ready
impl Copy for ReadyTimeoutError
impl Copy for ReasonCode
impl Copy for RecoderState
impl Copy for RecursiveMode
impl Copy for RecvError
impl Copy for RecvTimeoutError
impl Copy for RemovalCause
impl Copy for RemoveKind
impl Copy for RenameMode
impl Copy for RequeueOp
impl Copy for Rfc2822
impl Copy for Rfc3339
impl Copy for Role
impl Copy for Second
impl Copy for SelectTimeoutError
impl Copy for ServerNameType
impl Copy for SessionId
impl Copy for Side
impl Copy for SignatureAlgorithm
impl Copy for SignatureScheme
impl Copy for SliceOffset
impl Copy for Soundness
impl Copy for SpecificationError
impl Copy for SpeedAndMax
impl Copy for StandardAlloc
impl Copy for StartPosQueue
impl Copy for StreamResult
impl Copy for Subsecond
impl Copy for SubsecondDigits
impl Copy for SupportedCipherSuite
impl Copy for TDEFLFlush
impl Copy for TDEFLStatus
impl Copy for TINFLStatus
impl Copy for Tag
impl Copy for TbsCertificateParser
impl Copy for Time
impl Copy for TimePrecision
impl Copy for TimeoutFlags
impl Copy for Timespec
impl Copy for Tls12Resumption
impl Copy for Token
impl Copy for TruncSide
impl Copy for TryFromParsed
impl Copy for TryReadyError
impl Copy for TryRecvError
impl Copy for TryRecvError
impl Copy for TrySelectError
impl Copy for UCred
impl Copy for Union1
impl Copy for UnixTimestamp
impl Copy for UnixTimestampPrecision
impl Copy for UnparkResult
impl Copy for UnparkToken
impl Copy for UtcOffset
impl Copy for WaitTimeoutResult
impl Copy for WatchMask
impl Copy for WatcherKind
impl Copy for WebSocketConfig
impl Copy for WeekNumber
impl Copy for WeekNumberRepr
impl Copy for Weekday
impl Copy for Weekday
impl Copy for WeekdayRepr
impl Copy for X509CertificateParser
impl Copy for X509ExtensionParser
impl Copy for X509Version
impl Copy for Year
impl Copy for YearRepr
impl Copy for YesA1
impl Copy for YesA2
impl Copy for YesNI
impl Copy for YesS3
impl Copy for YesS4
impl Copy for ZopfliNode
impl Copy for __c_anonymous_ifr_ifru
libc_union
only.impl Copy for __c_anonymous_ifru_map
impl Copy for __c_anonymous_ptrace_syscall_info_data
libc_union
only.impl Copy for __c_anonymous_ptrace_syscall_info_entry
impl Copy for __c_anonymous_ptrace_syscall_info_exit
impl Copy for __c_anonymous_ptrace_syscall_info_seccomp
impl Copy for __c_anonymous_sockaddr_can_can_addr
libc_union
only.impl Copy for __c_anonymous_sockaddr_can_j1939
impl Copy for __c_anonymous_sockaddr_can_tp
impl Copy for __exit_status
impl Copy for __timeval
impl Copy for _libc_fpstate
impl Copy for _libc_fpxreg
impl Copy for _libc_xmmreg
impl Copy for addrinfo
impl Copy for af_alg_iv
impl Copy for aiocb
impl Copy for arpd_request
impl Copy for arphdr
impl Copy for arpreq
impl Copy for arpreq_old
impl Copy for can_filter
impl Copy for can_frame
impl Copy for canfd_frame
impl Copy for clone_args
impl Copy for cmsghdr
impl Copy for cpu_set_t
impl Copy for dirent
impl Copy for dirent64
impl Copy for dl_phdr_info
impl Copy for dqblk
impl Copy for epoll_event
impl Copy for fanotify_event_metadata
impl Copy for fanotify_response
impl Copy for fd_set
impl Copy for ff_condition_effect
impl Copy for ff_constant_effect
impl Copy for ff_effect
impl Copy for ff_envelope
impl Copy for ff_periodic_effect
impl Copy for ff_ramp_effect
impl Copy for ff_replay
impl Copy for ff_rumble_effect
impl Copy for ff_trigger
impl Copy for file_clone_range
impl Copy for flock
impl Copy for flock64
impl Copy for fpos64_t
impl Copy for fpos_t
impl Copy for fsid_t
impl Copy for genlmsghdr
impl Copy for glob64_t
impl Copy for glob_t
impl Copy for group
impl Copy for hostent
impl Copy for if_nameindex
impl Copy for ifaddrs
impl Copy for ifreq
impl Copy for in6_addr
impl Copy for in6_ifreq
impl Copy for in6_pktinfo
impl Copy for in6_rtmsg
impl Copy for in_addr
impl Copy for in_pktinfo
impl Copy for inotify_event
impl Copy for inotify_event
impl Copy for input_absinfo
impl Copy for input_event
impl Copy for input_id
impl Copy for input_keymap_entry
impl Copy for input_mask
impl Copy for iovec
impl Copy for ip_mreq
impl Copy for ip_mreq_source
impl Copy for ip_mreqn
impl Copy for ipc_perm
impl Copy for ipv6_mreq
impl Copy for itimerspec
impl Copy for itimerval
impl Copy for j1939_filter
impl Copy for lconv
impl Copy for linger
impl Copy for mallinfo
impl Copy for mallinfo2
impl Copy for max_align_t
impl Copy for mcontext_t
impl Copy for mmsghdr
impl Copy for mntent
impl Copy for mq_attr
impl Copy for msghdr
impl Copy for msginfo
impl Copy for msqid_ds
impl Copy for nl_mmap_hdr
impl Copy for nl_mmap_req
impl Copy for nl_pktinfo
impl Copy for nlattr
impl Copy for nlmsgerr
impl Copy for nlmsghdr
impl Copy for ntptimeval
impl Copy for open_how
impl Copy for option
impl Copy for packet_mreq
impl Copy for passwd
impl Copy for pollfd
impl Copy for posix_spawn_file_actions_t
impl Copy for posix_spawnattr_t
impl Copy for protoent
impl Copy for pthread_attr_t
impl Copy for pthread_cond_t
impl Copy for pthread_condattr_t
impl Copy for pthread_mutex_t
impl Copy for pthread_mutexattr_t
impl Copy for pthread_rwlock_t
impl Copy for pthread_rwlockattr_t
impl Copy for ptrace_peeksiginfo_args
impl Copy for ptrace_rseq_configuration
impl Copy for ptrace_syscall_info
impl Copy for regex_t
impl Copy for regmatch_t
impl Copy for rlimit
impl Copy for rlimit64
impl Copy for rtentry
impl Copy for rusage
impl Copy for sched_param
impl Copy for seccomp_data
impl Copy for seccomp_notif_sizes
impl Copy for sem_t
impl Copy for sembuf
impl Copy for semid_ds
impl Copy for seminfo
impl Copy for servent
impl Copy for shmid_ds
impl Copy for sigaction
impl Copy for sigevent
impl Copy for siginfo_t
impl Copy for signalfd_siginfo
impl Copy for sigset_t
impl Copy for sigval
impl Copy for sock_extended_err
impl Copy for sock_filter
impl Copy for sock_fprog
impl Copy for sock_txtime
impl Copy for sockaddr
impl Copy for sockaddr_alg
impl Copy for sockaddr_can
impl Copy for sockaddr_in
impl Copy for sockaddr_in6
impl Copy for sockaddr_ll
impl Copy for sockaddr_nl
impl Copy for sockaddr_storage
impl Copy for sockaddr_un
impl Copy for sockaddr_vm
impl Copy for spwd
impl Copy for stack_t
impl Copy for stat
impl Copy for stat64
impl Copy for statfs
impl Copy for statfs64
impl Copy for statvfs
impl Copy for statvfs64
impl Copy for statx
impl Copy for statx_timestamp
impl Copy for sysinfo
impl Copy for termios
impl Copy for termios2
impl Copy for timespec
impl Copy for timeval
impl Copy for timex
impl Copy for timezone
impl Copy for tm
impl Copy for tms
impl Copy for u24
impl Copy for ucontext_t
impl Copy for ucred
impl Copy for uinput_abs_setup
impl Copy for uinput_ff_erase
impl Copy for uinput_ff_upload
impl Copy for uinput_setup
impl Copy for uinput_user_dev
impl Copy for user
impl Copy for user_fpregs_struct
impl Copy for user_regs_struct
impl Copy for utimbuf
impl Copy for utmpx
impl Copy for utsname
impl Copy for vec128_storage
impl Copy for vec256_storage
impl Copy for vec512_storage
impl Copy for winsize
impl<'a> Copy for IpAddrRef<'a>
impl<'a> Copy for SubjectNameRef<'a>
impl<'a> Copy for std::path::Component<'a>
impl<'a> Copy for Prefix<'a>
impl<'a> Copy for Arguments<'a>
impl<'a> Copy for IoSlice<'a>
impl<'a> Copy for Location<'a>
impl<'a> Copy for Positive<'a>
impl<'a> Copy for Input<'a>
impl<'a> Copy for DnsNameRef<'a>
impl<'a> Copy for Ancestors<'a>
impl<'a> Copy for PrefixComponent<'a>
impl<'a> Copy for Name<'a>
impl<'a> Copy for DecodeError<'a>
impl<'a> Copy for InputPair<'a>
impl<'a> Copy for InputReference<'a>
impl<'a, E, Ix> Copy for petgraph::adj::EdgeReference<'a, E, Ix>where Ix: IndexType,
impl<'a, E, Ix> Copy for petgraph::graph_impl::stable_graph::EdgeReference<'a, E, Ix>where Ix: IndexType,
impl<'a, E, Ix> Copy for petgraph::graph_impl::EdgeReference<'a, E, Ix>where Ix: IndexType,
impl<'a, E, Ty, Ix> Copy for petgraph::csr::EdgeReference<'a, E, Ty, Ix>where Ix: Copy,
impl<'a, T> Copy for Slice<'a, T>where T: Copy,
impl<'a, T> Copy for ArcBorrow<'a, T>
impl<'a, T, const N: usize> Copy for ArrayWindows<'a, T, N>where T: Copy + 'a,
impl<'b, T> Copy for Ptr<'b, T>
impl<'fd> Copy for BorrowedFd<'fd>
impl<'prev, 'now> Copy for SubmitArgs<'prev, 'now>where 'prev: 'now,
impl<A> Copy for ExtendedGcd<A>where A: Copy,
impl<AllocU8, AllocU16, AllocI32, AllocU32, AllocU64, AllocCommand, AllocFloatX, AllocV8, AllocS16, AllocPDF, AllocStaticCommand, AllocHistogramLiteral, AllocHistogramCommand, AllocHistogramDistance, AllocHistogramPair, AllocContextType, AllocHuffmanTree, AllocZopfliNode> Copy for CombiningAllocator<AllocU8, AllocU16, AllocI32, AllocU32, AllocU64, AllocCommand, AllocFloatX, AllocV8, AllocS16, AllocPDF, AllocStaticCommand, AllocHistogramLiteral, AllocHistogramCommand, AllocHistogramDistance, AllocHistogramPair, AllocContextType, AllocHuffmanTree, AllocZopfliNode>where AllocU8: Allocator<u8> + Copy, AllocU16: Allocator<u16> + Copy, AllocI32: Allocator<i32> + Copy, AllocU32: Allocator<u32> + Copy, AllocU64: Allocator<u64> + Copy, AllocCommand: Allocator<Command> + Copy, AllocFloatX: Allocator<f32> + Copy, AllocV8: Allocator<CompatF8> + Copy, AllocS16: Allocator<Compat16x16> + Copy, AllocPDF: Allocator<PDF> + Copy, AllocStaticCommand: Allocator<Command<SliceOffset>> + Copy, AllocHistogramLiteral: Allocator<HistogramLiteral> + Copy, AllocHistogramCommand: Allocator<HistogramCommand> + Copy, AllocHistogramDistance: Allocator<HistogramDistance> + Copy, AllocHistogramPair: Allocator<HistogramPair> + Copy, AllocContextType: Allocator<ContextType> + Copy, AllocHuffmanTree: Allocator<HuffmanTree> + Copy, AllocZopfliNode: Allocator<ZopfliNode> + Copy,
impl<B> Copy for petgraph::visit::dfsvisit::Control<B>where B: Copy,
impl<B> Copy for ring::agreement::UnparsedPublicKey<B>where B: Copy + AsRef<[u8]>,
impl<B> Copy for RsaPublicKeyComponents<B>where B: Copy + AsRef<[u8]> + Debug,
impl<B> Copy for ring::signature::UnparsedPublicKey<B>where B: Copy + AsRef<[u8]>,
impl<B, C> Copy for ControlFlow<B, C>where B: Copy, C: Copy,
impl<Dyn> Copy for DynMetadata<Dyn>where Dyn: ?Sized,
impl<F> Copy for RepeatWith<F>where F: Copy,
impl<G> Copy for Reversed<G>where G: Copy,
impl<G, F> Copy for EdgeFiltered<G, F>where G: Copy, F: Copy,
impl<G, F> Copy for NodeFiltered<G, F>where G: Copy, F: Copy,
impl<Idx> Copy for RangeTo<Idx>where Idx: Copy,
impl<Idx> Copy for RangeToInclusive<Idx>where Idx: Copy,
impl<Ix> Copy for petgraph::adj::EdgeIndex<Ix>where Ix: Copy + IndexType,
impl<Ix> Copy for petgraph::graph_impl::EdgeIndex<Ix>where Ix: Copy,
impl<Ix> Copy for NodeIndex<Ix>where Ix: Copy,
impl<N> Copy for DfsEvent<N>where N: Copy,
impl<NI> Copy for Avx2Machine<NI>where NI: Copy,
impl<P> Copy for Pin<P>where P: Copy,
impl<R> Copy for ReversedEdgeReference<R>where R: Copy,
impl<S3, S4, NI> Copy for SseMachine<S3, S4, NI>where S3: Copy, S4: Copy, NI: Copy,
impl<S> Copy for Ascii<S>where S: Copy,
impl<S> Copy for UniCase<S>where S: Copy,
impl<SliceType> Copy for Command<SliceType>where SliceType: SliceWrapper<u8> + Clone + Copy,
impl<SliceType> Copy for FeatureFlagSliceType<SliceType>where SliceType: SliceWrapper<u8> + Clone + Copy,
impl<SliceType> Copy for LiteralCommand<SliceType>where SliceType: SliceWrapper<u8> + Clone + Copy,
impl<SliceType> Copy for PredictionModeContextMap<SliceType>where SliceType: SliceWrapper<u8> + Clone + Copy,
impl<T> Copy for Bound<T>where T: Copy,
impl<T> Copy for Option<T>where T: Copy,
impl<T> Copy for Poll<T>where T: Copy,
impl<T> Copy for std::sync::mpsc::TrySendError<T>where T: Copy,
impl<T> Copy for *const Twhere T: ?Sized,
impl<T> Copy for *mut Twhere T: ?Sized,
impl<T> Copy for &Twhere T: ?Sized,
Shared references can be copied, but mutable references cannot!