Type Alias mozjs::jsapi::EnsureCanAddPrivateElementOp
source · pub type EnsureCanAddPrivateElementOp = Option<unsafe extern "C" fn(_: *mut JSContext, _: Handle<Value>) -> bool>;
Expand description
Install an context wide callback that implements the ECMA262 specification
host hook HostEnsureCanAddPrivateElement
.
This hook, which should only be overriden for Web Browsers, examines the provided object to determine if the addition of a private field is allowed, throwing an exception and returning false if not.
The default implementation of this hook, which will be used unless overriden,
examines only proxy objects, and throws if the proxy handler returns true
from the handler method throwOnPrivateField()
.
Aliased Type§
enum EnsureCanAddPrivateElementOp {
None,
Some(unsafe extern "C" fn(_: *mut JSContext, _: Handle<Value>) -> bool),
}
Variants§
None
No value.
Some(unsafe extern "C" fn(_: *mut JSContext, _: Handle<Value>) -> bool)
Some value of type T
.
Trait Implementations§
source§impl<T: CustomTrace> CustomTrace for Option<T>
impl<T: CustomTrace> CustomTrace for Option<T>
source§impl<T: FromJSValConvertible> FromJSValConvertible for Option<T>
impl<T: FromJSValConvertible> FromJSValConvertible for Option<T>
§type Config = <T as FromJSValConvertible>::Config
type Config = <T as FromJSValConvertible>::Config
Optional configurable behaviour switch; use () for no configuration.
source§unsafe fn from_jsval(
cx: *mut JSContext,
value: HandleValue<'_>,
option: T::Config
) -> Result<ConversionResult<Option<T>>, ()>
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.