1 // Copyright (C) 2015, Andrzej Krzemienski.
2 //
3 // Use, modification, and distribution is subject to the Boost Software
4 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
5 // http://www.boost.org/LICENSE_1_0.txt)
6 //
7 // See http://www.boost.org/lib/optional for documentation.
8 //
9 // You are welcome to contact the author at:
10 //  [email protected]
11 
12 #include <iostream>
13 #include "boost/none.hpp"
14 // but no boost/optional/optional_io.hpp
15 
16 // THIS TEST SHOULD FAIL TO COMPILE
17 // Unless one includes header boost/optional/optional_io.hpp, it should not be possible
18 // to stream out boost::none.
19 
test_streaming_out_none()20 void test_streaming_out_none()
21 {
22   std::cout << boost::none;
23 }