Struct Caller 

pub struct Caller<'a, T> { /* private fields */ }

Represents the caller’s context when creating a host function via Func::wrap.

Implementations

impl<'a, T> Caller<'a, T>

pub fn new<C>(ctx: &'a mut C, instance: Option<&Instance>) -> Self

where C: AsContextMut<Data = T>,

Creates a new Caller from the given store context and Instance handle.

pub fn get_export(&self, name: &str) -> Option<Extern>

Queries the caller for an exported definition identifier by name.

Returns None if there is no associated Instance of the caller or if the caller does not provide an export under the name name.

pub fn data(&self) -> &T

Returns a shared reference to the user provided host data.

pub fn data_mut(&mut self) -> &mut T

Returns an exclusive reference to the user provided host data.

pub fn engine(&self) -> &Engine

Returns a shared reference to the used Engine.

pub fn fuel_consumed(&self) -> Option<u64>

Returns the amount of fuel consumed by executions of the Store so far.

Returns None if fuel metering is disabled.

pub fn get_fuel(&self) -> Result<u64, Error>

Returns the remaining fuel of the Store if fuel metering is enabled.

For more information see Store::get_fuel.

Errors

If fuel metering is disabled.

pub fn set_fuel(&mut self, fuel: u64) -> Result<(), Error>

Sets the remaining fuel of the Store to value if fuel metering is enabled.

For more information see Store::get_fuel.

Errors

If fuel metering is disabled.

Trait Implementations

impl<T> AsContext for Caller<'_, T>

type Data = T

The user state associated with the Store, aka the T in Store<T>.

fn as_context(&self) -> StoreContext<'_, Self::Data>

Returns the store context that this type provides access to.

impl<T> AsContextMut for Caller<'_, T>

fn as_context_mut(&mut self) -> StoreContextMut<'_, Self::Data>

Returns the store context that this type provides access to.

impl<'a, T: AsContextMut> From<&'a mut T> for Caller<'a, T::Data>

fn from(ctx: &'a mut T) -> Self

Converts to this type from the input type.