Struct RowTypeLayout

pub struct RowTypeLayout {
    pub layout: Layout,
    pub elements: Arc<[ProductTypeElementLayout]>,
}

The type of a row, annotated with a Layout.

This type ensures that the minimum row size is adhered to.

Fields

layout: Layout

The memoized layout of the product type.

elements: Arc<[ProductTypeElementLayout]>

The fields of the product type with their own layout annotations.

This is Arced at the row type level as clones and drops of this showed up in flamegraphs. A RowTypeLayout will typically be cloned once per table per transaction, assuming the table is touched during that transaction. This can be expensive for modules that have a lot of reducer calls per second.

Implementations

impl RowTypeLayout

pub fn product(&self) -> ProductTypeLayoutView<'_>

Returns a view of this row type as a product type.

pub fn size(&self) -> Size

Returns the row size for this row type.

Trait Implementations

impl Clone for RowTypeLayout

fn clone(&self) -> RowTypeLayout

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RowTypeLayout

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

Formats the value using the given formatter.

impl From<ProductType> for RowTypeLayout

fn from(ty: ProductType) -> Self

Converts to this type from the input type.

impl HasLayout for RowTypeLayout

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 Index<usize> for RowTypeLayout

type Output = AlgebraicTypeLayout

The returned type after indexing.

fn index(&self, index: usize) -> &Self::Output

Performs the indexing (container[index]) operation.

impl MemoryUsage for RowTypeLayout

fn heap_usage(&self) -> usize

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

impl PartialEq for RowTypeLayout

fn eq(&self, other: &RowTypeLayout) -> 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 RowTypeLayout

impl StructuralPartialEq for RowTypeLayout