Struct Layout

pub struct Layout<'a>(pub Interned<'a, LayoutData<FieldIdx, VariantIdx>>);

Tuple Fields

0: Interned<'a, LayoutData<FieldIdx, VariantIdx>>

Implementations

impl<'a> Layout<'a>

pub fn fields(self) -> &'a FieldsShape<FieldIdx>

pub fn variants(self) -> &'a Variants<FieldIdx, VariantIdx>

pub fn backend_repr(self) -> BackendRepr

pub fn largest_niche(self) -> Option<Niche>

pub fn align(self) -> AbiAndPrefAlign

pub fn size(self) -> Size

pub fn max_repr_align(self) -> Option<Align>

pub fn unadjusted_abi_align(self) -> Align

pub fn is_pointer_like(self, data_layout: &TargetDataLayout) -> bool

Whether the layout is from a type that implements std::marker::PointerLike.

Currently, that means that the type is pointer-sized, pointer-aligned, and has a initialized (non-union), scalar ABI.

Methods from Deref<Target = &'a LayoutData<FieldIdx, VariantIdx>>

pub fn is_aggregate(&self) -> bool

Returns true if this is an aggregate type (including a ScalarPair!)

pub fn is_uninhabited(&self) -> bool

Returns true if this is an uninhabited type

pub fn is_unsized(&self) -> bool

Returns true if the layout corresponds to an unsized type.

pub fn is_sized(&self) -> bool

pub fn is_1zst(&self) -> bool

Returns true if the type is sized and a 1-ZST (meaning it has size 0 and alignment 1).

pub fn is_zst(&self) -> bool

Returns true if the type is a ZST and not unsized.

Note that this does not imply that the type is irrelevant for layout! It can still have non-trivial alignment constraints. You probably want to use is_1zst instead.

pub fn eq_abi(&self, other: &Self) -> bool

Checks if these two Layout are equal enough to be considered “the same for all function call ABIs”. Note however that real ABIs depend on more details that are not reflected in the Layout; the PassMode need to be compared as well. Also note that we assume aggregates are passed via PassMode::Indirect or PassMode::Cast; more strict checks would otherwise be required.

Trait Implementations

impl<'a> Clone for Layout<'a>

fn clone(&self) -> Layout<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Layout<'a>

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

Formats the value using the given formatter.

impl<'a> Deref for Layout<'a>

type Target = &'a LayoutData<FieldIdx, VariantIdx>

The resulting type after dereferencing.

fn deref(&self) -> &&'a LayoutData<FieldIdx, VariantIdx>

Dereferences the value.

impl<'a> Hash for Layout<'a>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'a, __CTX> HashStable<__CTX> for Layout<'a>

where __CTX: HashStableContext,

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

impl<'a> PartialEq for Layout<'a>

fn eq(&self, other: &Layout<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> Copy for Layout<'a>

impl<'a> Eq for Layout<'a>

impl<'a> StructuralPartialEq for Layout<'a>

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: 8 bytes