ceph/src/boost/libs/fusion/test/sequence/adapt_assoc_struct_named_empty.cpp

   1 /*=============================================================================
   2     Copyright (c) 2016 Kohei Takahashi
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #include <boost/detail/lightweight_test.hpp>
   8 #include <boost/fusion/adapted/struct/adapt_assoc_struct_named.hpp>
   9 #include <boost/fusion/sequence/intrinsic/size.hpp>
  10 #include <boost/fusion/sequence/intrinsic/empty.hpp>
  11 #include <boost/fusion/sequence/intrinsic/begin.hpp>
  12 #include <boost/fusion/sequence/intrinsic/end.hpp>
  13 #include <boost/fusion/sequence/io/out.hpp>
  14 #include <boost/fusion/iterator/equal_to.hpp>
  15 #include <boost/fusion/container/vector/vector.hpp>
  16 #include <boost/fusion/container/list/list.hpp>
  17 #include <boost/fusion/container/generation/make_vector.hpp>
  18 #include <boost/fusion/sequence/comparison/equal_to.hpp>
  19 #include <boost/fusion/sequence/comparison/not_equal_to.hpp>
  20 #include <boost/fusion/sequence/comparison/less.hpp>
  21 #include <boost/fusion/sequence/comparison/less_equal.hpp>
  22 #include <boost/fusion/sequence/comparison/greater.hpp>
  23 #include <boost/fusion/sequence/comparison/greater_equal.hpp>
  24 #include <boost/fusion/mpl.hpp>
  25 #include <boost/fusion/support/is_view.hpp>
  26 #include <boost/mpl/is_sequence.hpp>
  27 #include <boost/mpl/assert.hpp>
  28 #include <iostream>
  29
  30 class empty_struct{};
  31 BOOST_FUSION_ADAPT_ASSOC_STRUCT_NAMED(::empty_struct,empty_struct,)
  32
  33 int
  34 main()
  35 {
  36     using namespace boost::fusion;
  37     using namespace boost;
  38
  39     std::cout << tuple_open('[');
  40     std::cout << tuple_close(']');
  41     std::cout << tuple_delimiter(", ");
  42
  43     empty_struct empty;
  44     {
  45         BOOST_MPL_ASSERT((traits::is_view<adapted::empty_struct>));
  46         adapted::empty_struct e(empty);
  47
  48         std::cout << e << std::endl;
  49         BOOST_TEST(e == make_vector());
  50
  51         BOOST_STATIC_ASSERT(fusion::result_of::size<adapted::empty_struct>::value == 0);
  52         BOOST_MPL_ASSERT((fusion::result_of::empty<adapted::empty_struct>));
  53
  54         BOOST_MPL_ASSERT((fusion::result_of::equal_to<
  55             fusion::result_of::begin<adapted::empty_struct>::type,
  56             fusion::result_of::end<adapted::empty_struct>::type>));
  57     }
  58
  59     {
  60         fusion::vector<> v;
  61         adapted::empty_struct e(empty);
  62         BOOST_TEST(v <= e);
  63         BOOST_TEST_NOT(e > v);
  64         BOOST_TEST_NOT(v < e);
  65         BOOST_TEST(v <= e);
  66         BOOST_TEST_NOT(e > v);
  67         BOOST_TEST(e >= v);
  68     }
  69
  70     {
  71         adapted::empty_struct e(empty);
  72
  73         // conversion from empty_struct to vector
  74         fusion::vector<> v(e);
  75         v = e;
  76
  77         // FIXME
  78         // conversion from empty_struct to list
  79         //fusion::list<> l(e);
  80         //l = e;
  81     }
  82
  83     BOOST_MPL_ASSERT((mpl::is_sequence<adapted::empty_struct>));
  84     BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<adapted::empty_struct, void>));
  85     BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<adapted::empty_struct, int>));
  86
  87     return boost::report_errors();
  88 }
  89