Struct SumTypeLayout

pub struct SumTypeLayout {
    pub layout: Layout,
    pub variants: Box<[SumTypeVariantLayout]>,
    pub payload_offset: u16,
}

A mirrior of SumType annotated with a Layout.

Fields

layout: Layout

The layout of a sum value of this sum type.

variants: Box<[SumTypeVariantLayout]>

The variants of the sum type.

payload_offset: u16

The relative offset of a sum value’s payload for sums of this type. Sum value tags are always at offset 0.

Implementations

impl SumTypeLayout

pub fn offset_of_variant_data(&self, _variant_tag: u8) -> usize

pub fn offset_of_tag(&self) -> usize

Trait Implementations

impl Clone for SumTypeLayout

fn clone(&self) -> SumTypeLayout

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for SumTypeLayout

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

Formats the value using the given formatter.

impl<'de> DeserializeSeed<'de> for &SumTypeLayout

type Output = SumValue

The type produced by using this seed.

fn deserialize<D: Deserializer<'de>>( self, deserializer: D, ) -> Result<Self::Output, D::Error>

Equivalent to the more common Deserialize::deserialize associated function, except with some initial piece of data (the seed self) passed in.

impl From<SumType> for SumTypeLayout

fn from(ty: SumType) -> Self

Converts to this type from the input type.

impl HasLayout for SumTypeLayout

fn layout(&self) -> &Layout

Returns the layout for objects of this type.

fn size(&self) -> usize

Returns the size, in bytes, for objects of this type.

fn align(&self) -> usize

Returns the alignment, in bytes, for objects of this type.

impl MemoryUsage for SumTypeLayout

fn heap_usage(&self) -> usize

The heap memory usage of this type. The default implementation returns 0.

impl PartialEq for SumTypeLayout

fn eq(&self, other: &SumTypeLayout) -> 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<'de> SumVisitor<'de> for &SumTypeLayout

type Output = SumValue

The resulting sum.

fn sum_name(&self) -> Option<&str>

Returns the name of the sum, if any.

fn is_option(&self) -> bool

Returns whether an option is expected.

fn visit_sum<A: SumAccess<'de>>(self, data: A) -> Result<Self::Output, A::Error>

Drives the deserialization of a sum value.

impl VariantVisitor for &SumTypeLayout

type Output = u8

The result of identifying a variant, e.g., some index type.

fn variant_names(&self, names: &mut dyn ValidNames)

Provides the visitor the chance to add valid names into names.

fn visit_tag<E: Error>(self, tag: u8) -> Result<Self::Output, E>

Identify the variant based on tag.

fn visit_name<E: Error>(self, name: &str) -> Result<Self::Output, E>

Identify the variant based on name.

impl Eq for SumTypeLayout

impl StructuralPartialEq for SumTypeLayout