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