Type Definition js::jsapi::JSHasInstanceOp

type JSHasInstanceOp = Option<unsafe extern "C" fn(cx: *mut JSContext, obj: HandleObject, vp: MutableHandleValue, bp: *mut bool) -> bool>;

Check whether v is an instance of obj. Return false on error or exception, true on success with true in *bp if v is an instance of obj, false in *bp otherwise.