Enum rustc_middle::ty::layout::SizeSkeleton
source · Expand description
Type size “skeleton”, i.e., the only information determining a type’s size. While this is conservative, (aside from constant sizes, only pointers, newtypes thereof and null pointer optimized enums are allowed), it is enough to statically check common use cases of transmute.
Variants
Known(Size)
Any statically computable Layout.
Pointer
Fields
non_zero: bool
If true, this pointer is never null.
tail: Ty<'tcx>
The type which determines the unsized metadata, if any, of this pointer. Either a type parameter or a projection depending on one, with regions erased.
A potentially-fat pointer.
Implementations
sourceimpl<'tcx> SizeSkeleton<'tcx>
impl<'tcx> SizeSkeleton<'tcx>
pub fn compute(
ty: Ty<'tcx>,
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>
) -> Result<SizeSkeleton<'tcx>, LayoutError<'tcx>>
pub fn same_size(self, other: SizeSkeleton<'tcx>) -> bool
Trait Implementations
sourceimpl<'tcx> Clone for SizeSkeleton<'tcx>
impl<'tcx> Clone for SizeSkeleton<'tcx>
sourcefn clone(&self) -> SizeSkeleton<'tcx>
fn clone(&self) -> SizeSkeleton<'tcx>
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresourceimpl<'tcx> Debug for SizeSkeleton<'tcx>
impl<'tcx> Debug for SizeSkeleton<'tcx>
impl<'tcx> Copy for SizeSkeleton<'tcx>
Auto Trait Implementations
impl<'tcx> !RefUnwindSafe for SizeSkeleton<'tcx>
impl<'tcx> Send for SizeSkeleton<'tcx>
impl<'tcx> Sync for SizeSkeleton<'tcx>
impl<'tcx> Unpin for SizeSkeleton<'tcx>
impl<'tcx> !UnwindSafe for SizeSkeleton<'tcx>
Blanket Implementations
sourceimpl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
T: Copy,
impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
T: Copy,
fn allocate_on(self, arena: &'a Arena<'tcx>) -> &'a mut T
fn allocate_from_iter(
arena: &'a Arena<'tcx>,
iter: impl IntoIterator<Item = T>
) -> &'a mut [T]ⓘNotable traits for &[u8]impl Read for &[u8]impl Write for &mut [u8]
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
sourceimpl<T, R> InternIteratorElement<T, R> for T
impl<T, R> InternIteratorElement<T, R> for T
type Output = R
fn intern_with<I, F>(iter: I, f: F) -> <T as InternIteratorElement<T, R>>::Outputwhere
I: Iterator<Item = T>,
F: FnOnce(&[T]) -> R,
sourceimpl<T> MaybeResult<T> for T
impl<T> MaybeResult<T> for T
sourceimpl<CTX, T> Value<CTX> for Twhere
CTX: DepContext,
impl<CTX, T> Value<CTX> for Twhere
CTX: DepContext,
default fn from_cycle_error(tcx: CTX) -> T
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
Layout
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.
Size: 16 bytes
Size for each variant:
Known
: 15 bytesPointer
: 15 bytes