Struct ViewExistential 

pub struct ViewExistential { /* private fields */ }

A heap-allocated any View existential container.

This is the native alternative to AnyView — constructed entirely from Rust using the Swift runtime’s value witness tables and metadata.

Implementations

impl ViewExistential

pub unsafe fn new( value: *const c_void, value_size: usize, metadata: *const c_void, view_wt: *const c_void, ) -> Self

Create a new existential from a concrete view value.

Safety

• value must point to a valid instance of the type described by metadata
• metadata must be a valid Swift type metadata pointer
• view_wt must be a valid View protocol witness table for the type

pub unsafe fn from_zero_size( metadata: *const c_void, view_wt: *const c_void, ) -> Self

Create from a zero-size type (EmptyView, Divider).

Safety

metadata must describe a type whose size is zero, and view_wt must be its View conformance. A type with a size has a value to point at, and this passes none.

pub fn metadata(&self) -> *const c_void

Get the type metadata pointer.

pub fn witness_table(&self) -> *const c_void

Get the View witness table pointer.

pub fn value_ptr(&self) -> *const c_void

Get pointer to the value (inline buffer start).

pub fn as_raw(&self) -> *const c_void

Get the raw existential container pointer (40 bytes).

Trait Implementations

impl Clone for ViewExistential

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Drop for ViewExistential

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.

impl Send for ViewExistential