Trait core::marker::Freeze

pub unsafe auto trait Freeze { }

🔬This is a nightly-only experimental API. (freeze #121675)

Used to determine whether a type contains any UnsafeCell internally, but not through an indirection. This affects, for example, whether a static of that type is placed in read-only static memory or writable static memory. This can be used to declare that a constant with a generic type will not contain interior mutability, and subsequently allow placing the constant behind references.

Safety

This trait is a core part of the language, it is just expressed as a trait in libcore for convenience. Do not implement it for other types.

Implementors

impl<T> Freeze for NonZero<T>

where T: ZeroablePrimitive + Freeze,

impl<T: ?Sized> !Freeze for UnsafeCell<T>

impl<T: ?Sized> Freeze for *const T

impl<T: ?Sized> Freeze for *mut T

impl<T: ?Sized> Freeze for &T

impl<T: ?Sized> Freeze for &mut T

impl<T: ?Sized> Freeze for PhantomData<T>

Auto implementors

impl !Freeze for AtomicBool

impl !Freeze for AtomicI8

impl !Freeze for AtomicI16

impl !Freeze for AtomicI32

impl !Freeze for AtomicI64

impl !Freeze for AtomicIsize

impl !Freeze for AtomicU8

impl !Freeze for AtomicU16

impl !Freeze for AtomicU32

impl !Freeze for AtomicU64

impl !Freeze for AtomicUsize

impl Freeze for AsciiChar

impl Freeze for core::cmp::Ordering

impl Freeze for Infallible

impl Freeze for c_void

impl Freeze for core::fmt::Alignment

impl Freeze for BasicBlock

impl Freeze for UnwindTerminateReason

impl Freeze for IpAddr

impl Freeze for Ipv6MulticastScope

impl Freeze for SocketAddr

impl Freeze for FpCategory

impl Freeze for IntErrorKind

impl Freeze for SearchStep

impl Freeze for core::sync::atomic::Ordering

impl Freeze for bool

impl Freeze for char

impl Freeze for f32

impl Freeze for f64

impl Freeze for i8

impl Freeze for i16

impl Freeze for i32

impl Freeze for i64

impl Freeze for i128

impl Freeze for isize

impl Freeze for str

impl Freeze for u8

impl Freeze for u16

impl Freeze for u32

impl Freeze for u64

impl Freeze for u128

impl Freeze for ()

impl Freeze for usize

impl Freeze for AllocError

impl Freeze for Layout

impl Freeze for LayoutError

impl Freeze for TypeId

impl Freeze for float64x1_t

impl Freeze for float64x1x2_t

impl Freeze for float64x1x3_t

impl Freeze for float64x1x4_t

impl Freeze for float64x2_t

impl Freeze for float64x2x2_t

impl Freeze for float64x2x3_t

impl Freeze for float64x2x4_t

impl Freeze for SY

impl Freeze for float32x2_t

impl Freeze for float32x2x2_t

impl Freeze for float32x2x3_t

impl Freeze for float32x2x4_t

impl Freeze for float32x4_t

impl Freeze for float32x4x2_t

impl Freeze for float32x4x3_t

impl Freeze for float32x4x4_t

impl Freeze for int8x4_t

impl Freeze for int8x8_t

impl Freeze for int8x8x2_t

impl Freeze for int8x8x3_t

impl Freeze for int8x8x4_t

impl Freeze for int8x16_t

impl Freeze for int8x16x2_t

impl Freeze for int8x16x3_t

impl Freeze for int8x16x4_t

impl Freeze for int16x2_t

impl Freeze for int16x4_t

impl Freeze for int16x4x2_t

impl Freeze for int16x4x3_t

impl Freeze for int16x4x4_t

impl Freeze for int16x8_t

impl Freeze for int16x8x2_t

impl Freeze for int16x8x3_t

impl Freeze for int16x8x4_t

impl Freeze for int32x2_t

impl Freeze for int32x2x2_t

impl Freeze for int32x2x3_t

impl Freeze for int32x2x4_t

impl Freeze for int32x4_t

impl Freeze for int32x4x2_t

impl Freeze for int32x4x3_t

impl Freeze for int32x4x4_t

impl Freeze for int64x1_t

impl Freeze for int64x1x2_t

impl Freeze for int64x1x3_t

impl Freeze for int64x1x4_t

impl Freeze for int64x2_t

impl Freeze for int64x2x2_t

impl Freeze for int64x2x3_t

impl Freeze for int64x2x4_t

impl Freeze for poly8x8_t

impl Freeze for poly8x8x2_t

impl Freeze for poly8x8x3_t

impl Freeze for poly8x8x4_t

impl Freeze for poly8x16_t

impl Freeze for poly8x16x2_t

impl Freeze for poly8x16x3_t

impl Freeze for poly8x16x4_t

impl Freeze for poly16x4_t

impl Freeze for poly16x4x2_t

impl Freeze for poly16x4x3_t

impl Freeze for poly16x4x4_t

impl Freeze for poly16x8_t

impl Freeze for poly16x8x2_t

impl Freeze for poly16x8x3_t

impl Freeze for poly16x8x4_t

impl Freeze for poly64x1_t

impl Freeze for poly64x1x2_t

impl Freeze for poly64x1x3_t

impl Freeze for poly64x1x4_t

impl Freeze for poly64x2_t

impl Freeze for poly64x2x2_t

impl Freeze for poly64x2x3_t

impl Freeze for poly64x2x4_t

impl Freeze for uint8x4_t

impl Freeze for uint8x8_t

impl Freeze for uint8x8x2_t

impl Freeze for uint8x8x3_t

impl Freeze for uint8x8x4_t

impl Freeze for uint8x16_t

impl Freeze for uint8x16x2_t

impl Freeze for uint8x16x3_t

impl Freeze for uint8x16x4_t

impl Freeze for uint16x2_t

impl Freeze for uint16x4_t

impl Freeze for uint16x4x2_t

impl Freeze for uint16x4x3_t

impl Freeze for uint16x4x4_t

impl Freeze for uint16x8_t

impl Freeze for uint16x8x2_t

impl Freeze for uint16x8x3_t

impl Freeze for uint16x8x4_t

impl Freeze for uint32x2_t

impl Freeze for uint32x2x2_t

impl Freeze for uint32x2x3_t

impl Freeze for uint32x2x4_t

impl Freeze for uint32x4_t

impl Freeze for uint32x4x2_t

impl Freeze for uint32x4x3_t

impl Freeze for uint32x4x4_t

impl Freeze for uint64x1_t

impl Freeze for uint64x1x2_t

impl Freeze for uint64x1x3_t

impl Freeze for uint64x1x4_t

impl Freeze for uint64x2_t

impl Freeze for uint64x2x2_t

impl Freeze for uint64x2x3_t

impl Freeze for uint64x2x4_t

impl Freeze for v2f64

impl Freeze for v2i64

impl Freeze for v2u64

impl Freeze for v4f32

impl Freeze for v4f64

impl Freeze for v4i32

impl Freeze for v4i64

impl Freeze for v4u32

impl Freeze for v4u64

impl Freeze for v8f32

impl Freeze for v8i16

impl Freeze for v8i32

impl Freeze for v8u16

impl Freeze for v8u32

impl Freeze for v16i8

impl Freeze for v16i16

impl Freeze for v16u8

impl Freeze for v16u16

impl Freeze for v32i8

impl Freeze for v32u8

impl Freeze for vector_bool_char

impl Freeze for vector_bool_int

impl Freeze for vector_bool_long

impl Freeze for vector_bool_short

impl Freeze for vector_double

impl Freeze for vector_float

impl Freeze for vector_signed_char

impl Freeze for vector_signed_int

impl Freeze for vector_signed_long

impl Freeze for vector_signed_short

impl Freeze for vector_unsigned_char

impl Freeze for vector_unsigned_int

impl Freeze for vector_unsigned_long

impl Freeze for vector_unsigned_short

impl Freeze for v128

impl Freeze for CpuidResult

impl Freeze for __m128

impl Freeze for __m128bh

impl Freeze for __m128d

impl Freeze for __m128i

impl Freeze for __m256

impl Freeze for __m256bh

impl Freeze for __m256d

impl Freeze for __m256i

impl Freeze for __m512

impl Freeze for __m512bh

impl Freeze for __m512d

impl Freeze for __m512i

impl Freeze for TryFromSliceError

impl Freeze for core::ascii::EscapeDefault

impl Freeze for BorrowError

impl Freeze for BorrowMutError

impl Freeze for CharTryFromError

impl Freeze for DecodeUtf16Error

impl Freeze for core::char::EscapeDebug

impl Freeze for core::char::EscapeDefault

impl Freeze for core::char::EscapeUnicode

impl Freeze for ParseCharError

impl Freeze for ToLowercase

impl Freeze for ToUppercase

impl Freeze for TryFromCharError

impl Freeze for FromBytesUntilNulError

impl Freeze for FromBytesWithNulError

impl Freeze for CStr

impl Freeze for Error

impl Freeze for SipHasher

impl Freeze for ReturnToArg

impl Freeze for UnwindActionArg

impl Freeze for Assume

impl Freeze for AddrParseError

impl Freeze for Ipv4Addr

impl Freeze for Ipv6Addr

impl Freeze for SocketAddrV4

impl Freeze for SocketAddrV6

impl Freeze for ParseFloatError

impl Freeze for ParseIntError

impl Freeze for TryFromIntError

impl Freeze for RangeFull

impl Freeze for core::ptr::Alignment

impl Freeze for TimSortRun

impl Freeze for ParseBoolError

impl Freeze for Utf8Error

impl Freeze for LocalWaker

impl Freeze for RawWaker

impl Freeze for RawWakerVTable

impl Freeze for Waker

impl Freeze for Duration

impl Freeze for TryFromFloatSecsError

impl Freeze for PhantomPinned

impl<'a> !Freeze for Request<'a>

impl<'a> Freeze for Source<'a>

impl<'a> Freeze for core::ffi::c_str::Bytes<'a>

impl<'a> Freeze for Arguments<'a>

impl<'a> Freeze for Formatter<'a>

impl<'a> Freeze for BorrowedCursor<'a>

impl<'a> Freeze for Location<'a>

impl<'a> Freeze for PanicInfo<'a>

impl<'a> Freeze for EscapeAscii<'a>

impl<'a> Freeze for CharSearcher<'a>

impl<'a> Freeze for core::str::Bytes<'a>

impl<'a> Freeze for CharIndices<'a>

impl<'a> Freeze for Chars<'a>

impl<'a> Freeze for EncodeUtf16<'a>

impl<'a> Freeze for core::str::EscapeDebug<'a>

impl<'a> Freeze for core::str::EscapeDefault<'a>

impl<'a> Freeze for core::str::EscapeUnicode<'a>

impl<'a> Freeze for Lines<'a>

impl<'a> Freeze for LinesAny<'a>

impl<'a> Freeze for SplitAsciiWhitespace<'a>

impl<'a> Freeze for SplitWhitespace<'a>

impl<'a> Freeze for Utf8Chunk<'a>

impl<'a> Freeze for Utf8Chunks<'a>

impl<'a> Freeze for Context<'a>

impl<'a> Freeze for ContextBuilder<'a>

impl<'a, 'b> Freeze for DebugList<'a, 'b>

impl<'a, 'b> Freeze for DebugMap<'a, 'b>

impl<'a, 'b> Freeze for DebugSet<'a, 'b>

impl<'a, 'b> Freeze for DebugStruct<'a, 'b>

impl<'a, 'b> Freeze for DebugTuple<'a, 'b>

impl<'a, 'b> Freeze for CharSliceSearcher<'a, 'b>

impl<'a, 'b> Freeze for StrSearcher<'a, 'b>

impl<'a, 'b, const N: usize> Freeze for CharArrayRefSearcher<'a, 'b, N>

impl<'a, 'f> Freeze for VaList<'a, 'f>

impl<'a, A> Freeze for core::option::Iter<'a, A>

impl<'a, A> Freeze for core::option::IterMut<'a, A>

impl<'a, F> Freeze for CharPredicateSearcher<'a, F>

where F: FnOnce(char) + Freeze,

impl<'a, I> Freeze for ByRefSized<'a, I>

impl<'a, P> Freeze for MatchIndices<'a, P>

where <P as Pattern<'a>>::Searcher: Freeze,

impl<'a, P> Freeze for Matches<'a, P>

where <P as Pattern<'a>>::Searcher: Freeze,

impl<'a, P> Freeze for RMatchIndices<'a, P>

where <P as Pattern<'a>>::Searcher: Freeze,

impl<'a, P> Freeze for RMatches<'a, P>

where <P as Pattern<'a>>::Searcher: Freeze,

impl<'a, P> Freeze for core::str::RSplit<'a, P>

where <P as Pattern<'a>>::Searcher: Freeze,

impl<'a, P> Freeze for core::str::RSplitN<'a, P>

where <P as Pattern<'a>>::Searcher: Freeze,

impl<'a, P> Freeze for RSplitTerminator<'a, P>

where <P as Pattern<'a>>::Searcher: Freeze,

impl<'a, P> Freeze for core::str::Split<'a, P>

where <P as Pattern<'a>>::Searcher: Freeze,

impl<'a, P> Freeze for core::str::SplitInclusive<'a, P>

where <P as Pattern<'a>>::Searcher: Freeze,

impl<'a, P> Freeze for core::str::SplitN<'a, P>

where <P as Pattern<'a>>::Searcher: Freeze,

impl<'a, P> Freeze for SplitTerminator<'a, P>

where <P as Pattern<'a>>::Searcher: Freeze,

impl<'a, T> Freeze for core::result::Iter<'a, T>

impl<'a, T> Freeze for core::result::IterMut<'a, T>

impl<'a, T> Freeze for Chunks<'a, T>

impl<'a, T> Freeze for ChunksExact<'a, T>

impl<'a, T> Freeze for ChunksExactMut<'a, T>

impl<'a, T> Freeze for ChunksMut<'a, T>

impl<'a, T> Freeze for core::slice::Iter<'a, T>

impl<'a, T> Freeze for core::slice::IterMut<'a, T>

impl<'a, T> Freeze for RChunks<'a, T>

impl<'a, T> Freeze for RChunksExact<'a, T>

impl<'a, T> Freeze for RChunksExactMut<'a, T>

impl<'a, T> Freeze for RChunksMut<'a, T>

impl<'a, T> Freeze for Windows<'a, T>

impl<'a, T, P> Freeze for ChunkBy<'a, T, P>

where P: Freeze,

impl<'a, T, P> Freeze for ChunkByMut<'a, T, P>

where P: Freeze,

impl<'a, T, P> Freeze for core::slice::RSplit<'a, T, P>

where P: FnOnce(&T) + Freeze,

impl<'a, T, P> Freeze for RSplitMut<'a, T, P>

where P: FnOnce(&T) + Freeze,

impl<'a, T, P> Freeze for core::slice::RSplitN<'a, T, P>

where P: FnOnce(&T) + Freeze,

impl<'a, T, P> Freeze for RSplitNMut<'a, T, P>

where P: FnOnce(&T) + Freeze,

impl<'a, T, P> Freeze for core::slice::Split<'a, T, P>

where P: FnOnce(&T) + Freeze,

impl<'a, T, P> Freeze for core::slice::SplitInclusive<'a, T, P>

where P: FnOnce(&T) + Freeze,

impl<'a, T, P> Freeze for SplitInclusiveMut<'a, T, P>

where P: FnOnce(&T) + Freeze,

impl<'a, T, P> Freeze for SplitMut<'a, T, P>

where P: FnOnce(&T) + Freeze,

impl<'a, T, P> Freeze for core::slice::SplitN<'a, T, P>

where P: FnOnce(&T) + Freeze,

impl<'a, T, P> Freeze for SplitNMut<'a, T, P>

where P: FnOnce(&T) + Freeze,

impl<'a, T, const N: usize> Freeze for core::slice::ArrayChunks<'a, T, N>

impl<'a, T, const N: usize> Freeze for ArrayChunksMut<'a, T, N>

impl<'a, T, const N: usize> Freeze for ArrayWindows<'a, T, N>

impl<'a, const N: usize> Freeze for CharArraySearcher<'a, N>

impl<'b, T> Freeze for Ref<'b, T>

where T: ?Sized,

impl<'b, T> Freeze for RefMut<'b, T>

where T: ?Sized,

impl<'data> Freeze for BorrowedBuf<'data>

impl<'f> Freeze for VaListImpl<'f>

impl<A> Freeze for Repeat<A>

where A: Freeze,

impl<A> Freeze for RepeatN<A>

where A: Freeze,

impl<A> Freeze for core::option::IntoIter<A>

where A: Freeze,

impl<A, B> Freeze for Chain<A, B>

where A: Freeze, B: Freeze,

impl<A, B> Freeze for Zip<A, B>

where A: Freeze, B: Freeze,

impl<B, C> Freeze for ControlFlow<B, C>

where C: Freeze, B: Freeze,

impl<Dyn> Freeze for DynMetadata<Dyn>

where Dyn: ?Sized,

impl<F> Freeze for FormatterFn<F>

where F: FnMut(&mut Formatter<'_>) + FnOnce(&mut Formatter<'_>) + Freeze,

impl<F> Freeze for PollFn<F>

where F: Freeze,

impl<F> Freeze for FromFn<F>

where F: Freeze,

impl<F> Freeze for OnceWith<F>

where F: Freeze,

impl<F> Freeze for RepeatWith<F>

where F: Freeze,

impl<H> Freeze for BuildHasherDefault<H>

impl<I> Freeze for FromIter<I>

where I: Freeze,

impl<I> Freeze for DecodeUtf16<I>

where I: Freeze,

impl<I> Freeze for Cloned<I>

where I: Freeze,

impl<I> Freeze for Copied<I>

where I: Freeze,

impl<I> Freeze for Cycle<I>

where I: Freeze,

impl<I> Freeze for Enumerate<I>

where I: Freeze,

impl<I> Freeze for Flatten<I>

where <<I as Iterator>::Item as IntoIterator>::IntoIter: Freeze, I: Freeze,

impl<I> Freeze for Fuse<I>

where I: Freeze,

impl<I> Freeze for Intersperse<I>

where <I as Iterator>::Item: Sized + Freeze, I: Freeze,

impl<I> Freeze for Peekable<I>

where I: Freeze, <I as Iterator>::Item: Freeze,

impl<I> Freeze for Skip<I>

where I: Freeze,

impl<I> Freeze for StepBy<I>

where I: Freeze,

impl<I> Freeze for Take<I>

where I: Freeze,

impl<I, F> Freeze for FilterMap<I, F>

where I: Freeze, F: Freeze,

impl<I, F> Freeze for Inspect<I, F>

where I: Freeze, F: Freeze,

impl<I, F> Freeze for Map<I, F>

where I: Freeze, F: Freeze,

impl<I, F, const N: usize> Freeze for MapWindows<I, F, N>

where F: Freeze, I: Freeze, <I as Iterator>::Item: Freeze,

impl<I, G> Freeze for IntersperseWith<I, G>

where G: Freeze, <I as Iterator>::Item: Freeze, I: Freeze,

impl<I, P> Freeze for Filter<I, P>

where I: Freeze, P: Freeze,

impl<I, P> Freeze for MapWhile<I, P>

where I: Freeze, P: Freeze,

impl<I, P> Freeze for SkipWhile<I, P>

where I: Freeze, P: Freeze,

impl<I, P> Freeze for TakeWhile<I, P>

where I: Freeze, P: Freeze,

impl<I, St, F> Freeze for Scan<I, St, F>

where I: Freeze, F: Freeze, St: Freeze,

impl<I, U, F> Freeze for FlatMap<I, U, F>

where <U as IntoIterator>::IntoIter: Freeze, I: Freeze, F: Freeze,

impl<I, const N: usize> Freeze for core::iter::ArrayChunks<I, N>

where I: Freeze, <I as Iterator>::Item: Freeze,

impl<Idx> Freeze for Range<Idx>

where Idx: Freeze,

impl<Idx> Freeze for RangeFrom<Idx>

where Idx: Freeze,

impl<Idx> Freeze for RangeInclusive<Idx>

where Idx: Freeze,

impl<Idx> Freeze for RangeTo<Idx>

where Idx: Freeze,

impl<Idx> Freeze for RangeToInclusive<Idx>

where Idx: Freeze,

impl<Ptr> Freeze for Pin<Ptr>

where Ptr: Freeze,

impl<Ret, T> Freeze for fn(T₁, T₂, …, Tₙ) -> Ret

impl<T> !Freeze for Cell<T>

impl<T> !Freeze for OnceCell<T>

impl<T> !Freeze for RefCell<T>

impl<T> !Freeze for SyncUnsafeCell<T>

impl<T> !Freeze for AtomicPtr<T>

impl<T> Freeze for Bound<T>

where T: Freeze,

impl<T> Freeze for Option<T>

where T: Freeze,

impl<T> Freeze for Poll<T>

where T: Freeze,

impl<T> Freeze for [T]

where T: Freeze,

impl<T> Freeze for (T₁, T₂, …, Tₙ)

where T: Freeze,

impl<T> Freeze for Reverse<T>

where T: Freeze,

impl<T> Freeze for Pending<T>

impl<T> Freeze for Ready<T>

where T: Freeze,

impl<T> Freeze for Empty<T>

impl<T> Freeze for Once<T>

where T: Freeze,

impl<T> Freeze for Rev<T>

where T: Freeze,

impl<T> Freeze for Discriminant<T>

where <T as DiscriminantKind>::Discriminant: Freeze,

impl<T> Freeze for ManuallyDrop<T>

where T: Freeze + ?Sized,

impl<T> Freeze for Saturating<T>

where T: Freeze,

impl<T> Freeze for Wrapping<T>

where T: Freeze,

impl<T> Freeze for Yeet<T>

where T: Freeze,

impl<T> Freeze for AssertUnwindSafe<T>

where T: Freeze,

impl<T> Freeze for NonNull<T>

where T: ?Sized,

impl<T> Freeze for core::result::IntoIter<T>

where T: Freeze,

impl<T> Freeze for Exclusive<T>

where T: Freeze + ?Sized,

impl<T> Freeze for MaybeUninit<T>

where T: Freeze,

impl<T, E> Freeze for Result<T, E>

where T: Freeze, E: Freeze,

impl<T, F = fn() -> T> !Freeze for LazyCell<T, F>

impl<T, F> Freeze for Successors<T, F>

where F: Freeze, T: Freeze,

impl<T, const N: usize> Freeze for [T; N]

where T: Freeze,

impl<T, const N: usize> Freeze for core::array::IntoIter<T, N>

where T: Freeze,

impl<T, const N: usize> Freeze for Mask<T, N>

where LaneCount<N>: Sealed, T: Sealed + SimdCast<Mask = T> + Sealed + SimdElement + Copy + Clone + Sealed + Freeze,

impl<T, const N: usize> Freeze for Simd<T, N>

where T: Copy + Clone + Sealed + Freeze, LaneCount<N>: Sealed,

impl<T, const N: usize> Freeze for [MaybeUninit<T>; N]

where T: Freeze,

impl<Y, R> Freeze for CoroutineState<Y, R>

where Y: Freeze, R: Freeze,

impl<const N: usize> Freeze for LaneCount<N>

impl<const N: usize> Freeze for GetManyMutError<N>

impl<const N: usize> Freeze for [u8; N]