Type Alias mozjs::jsapi::JSMayResolveOp

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pub type JSMayResolveOp = Option<unsafe extern "C" fn(_: *const JSAtomState, _: PropertyKey, _: *mut JSObject) -> bool>;
Expand description

A class with a resolve hook can optionally have a mayResolve hook. This hook must have no side effects and must return true for a given id if the resolve hook may resolve this id. This is useful when we’re doing a “pure” lookup: if mayResolve returns false, we know we don’t have to call the effectful resolve hook.

maybeObj, if non-null, is the object on which we’re doing the lookup. This can be nullptr: during JIT compilation we sometimes know the Class but not the object.

Aliased Type§

enum JSMayResolveOp {
    None,
    Some(unsafe extern "C" fn(_: *const JSAtomState, _: PropertyKey, _: *mut JSObject) -> bool),
}

Variants§

§1.0.0

None

No value.

§1.0.0

Some(unsafe extern "C" fn(_: *const JSAtomState, _: PropertyKey, _: *mut JSObject) -> bool)

Some value of type T.

Trait Implementations§

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impl<T: CustomTrace> CustomTrace for Option<T>

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impl<T: FromJSValConvertible> FromJSValConvertible for Option<T>

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type Config = <T as FromJSValConvertible>::Config

Optional configurable behaviour switch; use () for no configuration.
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unsafe fn from_jsval( cx: *mut JSContext, value: HandleValue<'_>, option: T::Config ) -> Result<ConversionResult<Option<T>>, ()>

Convert val to type Self. Optional configuration of type T can be passed as the option argument. If it returns Err(()), a JSAPI exception is pending. If it returns Ok(Failure(reason)), there is no pending JSAPI exception.
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impl<T: ToJSValConvertible> ToJSValConvertible for Option<T>

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unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue<'_>)

Convert self to a JSVal. JSAPI failure causes a panic.
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impl<T: Traceable> Traceable for Option<T>

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unsafe fn trace(&self, trc: *mut JSTracer)

Trace self.