Trait HostError 

pub trait HostError:
    'static
    + Display
    + Debug
    + DowncastSync { }

Trait that allows the host to return a custom error.

It should be useful for representing custom traps, troubles at instantiation time or other host-specific conditions.

Types that implement this trait can automatically be converted to rwasm::Error and rwasm::Trap and will be represented as a boxed HostError. You can then use the various methods on rwasm::Error to get your custom error type back

Implementations

impl dyn HostError

pub fn is<__T: HostError>(&self) -> bool

Returns true if the trait object wraps an object of type __T.

pub fn downcast<__T: HostError>(self: Box<Self>) -> Result<Box<__T>, Box<Self>>

Returns a boxed object from a boxed trait object if the underlying object is of type __T. Returns the original boxed trait if it isn’t.

pub fn downcast_rc<__T: HostError>(self: Rc<Self>) -> Result<Rc<__T>, Rc<Self>>

Returns an Rc-ed object from an Rc-ed trait object if the underlying object is of type __T. Returns the original Rc-ed trait if it isn’t.

pub fn downcast_ref<__T: HostError>(&self) -> Option<&__T>

Returns a reference to the object within the trait object if it is of type __T, or None if it isn’t.

pub fn downcast_mut<__T: HostError>(&mut self) -> Option<&mut __T>

Returns a mutable reference to the object within the trait object if it is of type __T, or None if it isn’t.

Implementors