Struct Layout 

pub struct Layout {
    pub size: u64,
    pub align: u64,
    pub niches: Vec<NicheRange>,
    pub discriminant: Option<DiscriminantStrategy>,
}

The layout of a Gruel type: size, alignment, niches, and (for enums) its discriminant strategy.

Layout is a pure function of the type. Because types are interned, the pool caches the result of layout_of keyed by Type.

Fields

size: u64

ABI size in bytes (matches LLVM store width).

align: u64

ABI alignment in bytes.

niches: Vec<NicheRange>

Forbidden bit-pattern ranges within a value of this type.

discriminant: Option<DiscriminantStrategy>

For enum types: how the discriminant is encoded. None for non-enums.

Implementations

impl Layout

pub fn scalar(size: u64, align: u64) -> Self

A layout with the given size and alignment, no niches, no enum repr.

pub fn zero_sized() -> Self

A zero-sized layout.

pub fn discriminant_strategy(&self) -> Option<DiscriminantStrategy>

Discriminant strategy for enum types; None for non-enum types.

Trait Implementations

impl Clone for Layout

fn clone(&self) -> Layout

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Layout

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

Formats the value using the given formatter.

impl PartialEq for Layout

fn eq(&self, other: &Layout) -> 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 Eq for Layout

impl StructuralPartialEq for Layout