optional_test_fail3b.cpp 663 B

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  1. // Copyright (C) 2003, Fernando Luis Cacciola Carballal.
  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. // fernando_cacciola@hotmail.com
  11. //
  12. #include<string>
  13. #include "boost/optional.hpp"
  14. struct A {} ;
  15. struct B {} ;
  16. //
  17. // THIS TEST SHOULD FAIL TO COMPILE
  18. //
  19. void test_no_unsupported_conversion()
  20. {
  21. boost::optional<A> opt1;
  22. boost::optional<B> opt2;
  23. opt2 = opt1 ; // Cannot convert from "A" to "B"
  24. }