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Library/boost/libs/optional/test/optional_test_ref_move.cpp
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19 дек 2024, 19:11
19 дек 2024, 19:11
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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(); }