1 // Copyright (C) 2014 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 "boost/optional/optional.hpp"
13 
14 #ifdef BOOST_BORLANDC
15 #pragma hdrstop
16 #endif
17 
18 #include "boost/core/lightweight_test.hpp"
19 #include "boost/none.hpp"
20 
21 
22 struct SemiRegular // no operator==
23 {
operator ==SemiRegular24 private: void operator==(SemiRegular const&) const {}
operator !=SemiRegular25 private: void operator!=(SemiRegular const&) const {}
26 };
27 
test_equal_to_none_of_noncomparable_T()28 void test_equal_to_none_of_noncomparable_T()
29 {
30   boost::optional<SemiRegular> i = SemiRegular();
31   boost::optional<SemiRegular> o;
32 
33   BOOST_TEST(i != boost::none);
34   BOOST_TEST(boost::none != i);
35   BOOST_TEST(o == boost::none);
36   BOOST_TEST(boost::none == o);
37 }
38 
main()39 int main()
40 {
41   test_equal_to_none_of_noncomparable_T();
42   return boost::report_errors();
43 }
44