# Struct rustc_target::abi::LayoutS

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    pub struct LayoutS<FieldIdx, VariantIdx>where
        FieldIdx: Idx,
        VariantIdx: Idx,{
        pub fields: 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,
    }

## Fields§

§`fields: FieldsShape<FieldIdx>`

Says where the fields are located within the layout.

§`variants: Variants<FieldIdx, VariantIdx>`

Encodes information about multi-variant layouts. Even with `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: Abi`

The `abi` defines how this data is passed between functions, and it defines value restrictions via `valid_range`.

Note that this is entirely orthogonal to the recursive structure defined by `variants` and `fields`; for example, `ManuallyDrop<Result<isize, isize>>` has `Abi::ScalarPair`! So, even with non-`Aggregate` `abi`, `fields` and `variants` have to be taken into account to find all fields of this layout.

§`largest_niche: Option<Niche>`

The leaf scalar with the largest number of invalid values (i.e. outside of its `valid_range`), if it exists.

§`align: AbiAndPrefAlign`§`size: Size`§`max_repr_align: Option<Align>`

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.

§`unadjusted_abi_align: Align`

The alignment the type would have, ignoring any `repr(align)` but including `repr(packed)`. Only used on aarch64-linux, where the argument passing ABI ignores the requested alignment in some cases.

## Auto Trait Implementations§

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### impl<FieldIdx, VariantIdx> RefUnwindSafe for LayoutS<FieldIdx, VariantIdx>
where VariantIdx: RefUnwindSafe,

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### impl<FieldIdx, VariantIdx> Send for LayoutS<FieldIdx, VariantIdx>
where VariantIdx: Send,

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### impl<FieldIdx, VariantIdx> Sync for LayoutS<FieldIdx, VariantIdx>
where VariantIdx: Sync,

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### impl<FieldIdx, VariantIdx> Unpin for LayoutS<FieldIdx, VariantIdx>
where VariantIdx: Unpin,

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### impl<FieldIdx, VariantIdx> UnwindSafe for LayoutS<FieldIdx, VariantIdx>
where VariantIdx: UnwindSafe,

## Blanket Implementations§

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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

## Layout§

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.