Enum rustc::ty::layout::SizeSkeleton

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

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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 usecases of transmute.

Variants

Known(Size)

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Any statically computable Layout.

Pointer

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

A potentially-fat pointer.

Fields of Pointer

non_zero: bool	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead? If true, this pointer is never null.
tail: Ty<'tcx>	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead? 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.

Methods

impl<'a, 'tcx> SizeSkeleton<'tcx>

pub fn compute(
    ty: Ty<'tcx>,
    tcx: TyCtxt<'a, 'tcx, 'tcx>,
    param_env: ParamEnv<'tcx>
) -> Result<SizeSkeleton<'tcx>, LayoutError<'tcx>>

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

pub fn same_size(self, other: SizeSkeleton) -> bool

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Trait Implementations

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

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> Debug for SizeSkeleton<'tcx>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.