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- // Copyright (C) 2014 Andrzej Krzemienski.
- //
- // Use, modification, and distribution is subject to the Boost Software
- // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- //
- // See http://www.boost.org/lib/optional for documentation.
- //
- // You are welcome to contact the author at: akrzemi1@gmail.com
- #include "boost/optional/optional.hpp"
- #ifdef __BORLANDC__
- #pragma hdrstop
- #endif
- #include <string>
- #include "boost/core/addressof.hpp"
- #include "boost/core/lightweight_test.hpp"
- using boost::optional;
- std::string global("text");
- optional<std::string&> make_optional_string_ref()
- {
- return optional<std::string&>(global);
- }
- std::string& return_global()
- {
- return global;
- }
- int main()
- {
- optional<std::string&> opt;
- opt = make_optional_string_ref();
- BOOST_TEST(bool(opt));
- BOOST_TEST(*opt == global);
- BOOST_TEST(boost::addressof(*opt) == boost::addressof(global));
-
- {
- std::string& str = *make_optional_string_ref();
- BOOST_TEST(str == global);
- BOOST_TEST(boost::addressof(str) == boost::addressof(global));
- }
-
- {
- std::string& str = make_optional_string_ref().value();
- BOOST_TEST(str == global);
- BOOST_TEST(boost::addressof(str) == boost::addressof(global));
- }
-
- {
- std::string& str = make_optional_string_ref().value_or(global);
- BOOST_TEST(str == global);
- BOOST_TEST(boost::addressof(str) == boost::addressof(global));
- }
-
- {
- std::string& str = make_optional_string_ref().value_or_eval(&return_global);
- BOOST_TEST(str == global);
- BOOST_TEST(boost::addressof(str) == boost::addressof(global));
- }
-
- return boost::report_errors();
- }
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