ceph/src/boost/libs/optional/test/optional_test_ref_move.cpp

   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: akrzemi1@gmail.com
  10
  11
  12 #include "boost/optional/optional.hpp"
  13
  14 #ifdef __BORLANDC__
  15 #pragma hdrstop
  16 #endif
  17
  18 #include <string>
  19 #include "boost/core/addressof.hpp"
  20 #include "boost/core/lightweight_test.hpp"
  21
  22 using boost::optional;
  23
  24 std::string global("text");
  25
  26 optional<std::string&> make_optional_string_ref()
  27 {
  28   return optional<std::string&>(global);
  29 }
  30
  31 std::string& return_global()
  32 {
  33   return global;
  34 }
  35
  36 int main()
  37 {
  38   optional<std::string&> opt;
  39   opt = make_optional_string_ref();
  40   BOOST_TEST(bool(opt));
  41   BOOST_TEST(*opt == global);
  42   BOOST_TEST(boost::addressof(*opt) == boost::addressof(global));
  43
  44   {
  45     std::string& str = *make_optional_string_ref();
  46     BOOST_TEST(str == global);
  47     BOOST_TEST(boost::addressof(str) == boost::addressof(global));
  48   }
  49
  50   {
  51     std::string& str = make_optional_string_ref().value();
  52     BOOST_TEST(str == global);
  53     BOOST_TEST(boost::addressof(str) == boost::addressof(global));
  54   }
  55
  56   {
  57     std::string& str = make_optional_string_ref().value_or(global);
  58     BOOST_TEST(str == global);
  59     BOOST_TEST(boost::addressof(str) == boost::addressof(global));
  60   }
  61
  62   {
  63     std::string& str = make_optional_string_ref().value_or_eval(&return_global);
  64     BOOST_TEST(str == global);
  65     BOOST_TEST(boost::addressof(str) == boost::addressof(global));
  66   }
  67
  68   return boost::report_errors();
  69 }