Enum rustc_middle::ty::layout::SizeSkeleton

pub enum SizeSkeleton<'tcx> {
    Known(Size),
    Pointer {
        non_zero: bool,
        tail: Ty<'tcx>,
    },
}

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

A potentially-fat pointer.

Fields of Pointer

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.

Implementations

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<'_>) -> bool

Trait Implementations

impl<'tcx> Clone for SizeSkeleton<'tcx>

fn clone(&self) -> SizeSkeleton<'tcx>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'tcx> Copy for SizeSkeleton<'tcx>

impl<'tcx> Debug for SizeSkeleton<'tcx>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.