Function gobject_sys::g_cclosure_marshal_VOID__DOUBLE

pub unsafe extern fn g_cclosure_marshal_VOID__DOUBLE(closure: *mut GClosure,
                                                     return_value: *mut GValue,
                                                     n_param_values: c_uint,
                                                     param_values: *const GValue,
                                                     invocation_hint: gpointer,
                                                     marshal_data: gpointer)