Enum Extern 

pub enum Extern {
    Func(Func),
    Global(Global),
    Table(Table),
    Memory(Memory),
    SharedMemory(SharedMemory),
    Tag(Tag),
}

An external item to a WebAssembly module, or a list of what can possibly be exported from a wasm module.

This is both returned from Instance::exports as well as required by Instance::new. In other words, this is the type of extracted values from an instantiated module, and it’s also used to provide imported values when instantiating a module.

Variants

Func(Func)

A WebAssembly func which can be called.

Global(Global)

A WebAssembly global which acts like a Cell<T> of sorts, supporting get and set operations.

Table(Table)

A WebAssembly table which is an array of Val reference types.

Memory(Memory)

A WebAssembly linear memory.

SharedMemory(SharedMemory)

A WebAssembly shared memory; these are handled separately from Memory.

Tag(Tag)

A WebAssembly exception or control tag which can be referenced when raising an exception or stack switching.

Implementations

impl Extern

pub fn into_func(self) -> Option<Func>

Available on crate feature runtime only.

Returns the underlying Func, if this external is a function.

Returns None if this is not a function.

pub fn into_global(self) -> Option<Global>

Available on crate feature runtime only.

Returns the underlying Global, if this external is a global.

Returns None if this is not a global.

pub fn into_table(self) -> Option<Table>

Available on crate feature runtime only.

Returns the underlying Table, if this external is a table.

Returns None if this is not a table.

pub fn into_memory(self) -> Option<Memory>

Available on crate feature runtime only.

Returns the underlying Memory, if this external is a memory.

Returns None if this is not a memory.

pub fn into_shared_memory(self) -> Option<SharedMemory>

Available on crate feature runtime only.

Returns the underlying SharedMemory, if this external is a shared memory.

Returns None if this is not a shared memory.

pub fn into_tag(self) -> Option<Tag>

Available on crate feature runtime only.

Returns the underlying Tag, if this external is a tag.

Returns None if this is not a tag.

pub fn ty(&self, store: impl AsContext) -> ExternType

Available on crate feature runtime only.

Returns the type associated with this Extern.

The store argument provided must own this Extern and is used to look up type information.

Panics

Panics if this item does not belong to the store provided.

Trait Implementations

impl Clone for Extern

Available on crate feature runtime only.

fn clone(&self) -> Extern

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Extern

Available on crate feature runtime only.

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

Formats the value using the given formatter.

impl From<Func> for Extern

Available on crate feature runtime only.

fn from(r: Func) -> Self

Converts to this type from the input type.

impl From<Global> for Extern

Available on crate feature runtime only.

fn from(r: Global) -> Self

Converts to this type from the input type.

impl From<Memory> for Extern

Available on crate feature runtime only.

fn from(r: Memory) -> Self

Converts to this type from the input type.

impl From<SharedMemory> for Extern

Available on crate feature runtime only.

fn from(r: SharedMemory) -> Self

Converts to this type from the input type.

impl From<Table> for Extern

Available on crate feature runtime only.

fn from(r: Table) -> Self

Converts to this type from the input type.

impl From<Tag> for Extern

Available on crate feature runtime only.

fn from(t: Tag) -> Self

Converts to this type from the input type.