Function g_function_info_invoke 

pub unsafe extern "C" fn g_function_info_invoke(
    info: *mut GIFunctionInfo,
    in_args: *const GIArgument,
    n_in_args: c_int,
    out_args: *const GIArgument,
    n_out_args: c_int,
    return_value: *mut GIArgument,
    error: *mut *mut GError,
) -> gboolean