Struct Shape

pub struct Shape {
    pub name: NameFn,
    pub typeid: TypeId,
    pub layout: Layout,
    pub innards: Innards,
    pub set_to_default: Option<SetToDefaultFn>,
    pub drop_in_place: Option<DropFn>,
}

Schema for reflection of a type

Fields

name: NameFn

A descriptive name for the type, e.g. u64, or Person

typeid: TypeId

The typeid of the underlying type

layout: Layout

Size & alignment

innards: Innards

Details/contents of the value

set_to_default: Option<SetToDefaultFn>

Set the value at a given address to the default value for this type

drop_in_place: Option<DropFn>

Drop the value at a given address

Safety

This function should be called only for initialized values. It’s the caller’s responsibility to ensure the address points to a valid value.

Implementations

impl Shape

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

Pretty-print this shape, recursively.

pub fn known_fields(&self) -> &'static [Field]

Returns a slice of statically known fields. Fields that are not in there might still be inserted if it’s a dynamic collection.

pub fn field_by_name(&self, name: &str) -> Option<&Field>

Returns a reference to a field with the given name, if it exists

pub fn field_by_index(&self, index: usize) -> Result<&Field, FieldError>

Returns a reference to a field with the given index, if it exists

pub fn dangling(&self) -> NonNull<u8>

Returns a dangling pointer for this shape.

This is useful for zero-sized types (ZSTs) which don’t need actual memory allocation, but still need a properly aligned “some address”.

Safety

This function returns a dangling pointer. It should only be used in contexts where a non-null pointer is required but no actual memory access will occur, such as for ZSTs.

Trait Implementations

impl Clone for Shape

fn clone(&self) -> Shape

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Shape

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

Formats the value using the given formatter.

impl Display for Shape

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

Formats the value using the given formatter.

impl Hash for Shape

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 PartialEq for Shape

fn eq(&self, other: &Self) -> 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 Copy for Shape

impl Eq for Shape