pub struct LayoutS<FieldIdx, VariantIdx>FieldsShape<FieldIdx>, pub variants: Variants<FieldIdx, VariantIdx>, pub abi: Abi, pub largest_niche: Option<Niche>, pub align: AbiAndPrefAlign, pub size: Size, pub max_repr_align: Option<Align>, pub unadjusted_abi_align: Align, }
Says where the fields are located within the layout.
variants: Variants<FieldIdx, VariantIdx>
Encodes information about multi-variant layouts.
Multiple variants, a layout still has its own fields! Those are then
shared between all variants. One of them will be the discriminant,
but e.g. coroutines can have more.
To access all fields of this layout, both
fields and the fields of the active variant
must be taken into account.
abi defines how this data is passed between functions, and it defines
value restrictions via
Note that this is entirely orthogonal to the recursive structure defined by
fields; for example,
ManuallyDrop<Result<isize, isize>> has
Abi::ScalarPair! So, even with non-
have to be taken into account to find all fields of this layout.
The leaf scalar with the largest number of invalid values
(i.e. outside of its
valid_range), if it exists.
The largest alignment explicitly requested with
repr(align) on this type or any field.
Only used on i686-windows, where the argument passing ABI is different when alignment is
requested, even if the requested alignment is equal to the natural alignment.
The alignment the type would have, ignoring any
repr(align) but including
Only used on aarch64-linux, where the argument passing ABI ignores the requested alignment
in some cases.
Auto Trait Implementations§
impl<FieldIdx, VariantIdx> RefUnwindSafe for LayoutS<FieldIdx, VariantIdx>where
impl<FieldIdx, VariantIdx> UnwindSafe for LayoutS<FieldIdx, VariantIdx>where
Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.