pub unsafe extern "C" fn jsc_class_add_constructorv(
jsc_class: *mut JSCClass,
name: *const c_char,
callback: GCallback,
user_data: gpointer,
destroy_notify: GDestroyNotify,
return_type: GType,
n_parameters: c_uint,
parameter_types: *mut GType
) -> *mut JSCValue