ceph/src/boost/libs/fusion/test/support/unused.cpp

   1 /*=============================================================================
   2     Copyright (c) 2018 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
   8 #include <boost/config.hpp>
   9 #include <boost/fusion/support/unused.hpp>
  10 #include <boost/type_traits/detail/yes_no_type.hpp>
  11 #include <boost/static_assert.hpp>
  12 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  13 #include <utility>
  14 #endif
  15
  16 struct T { };
  17
  18 void unused_construction()
  19 {
  20     boost::fusion::unused_type dephault;
  21
  22     boost::fusion::unused_type BOOST_ATTRIBUTE_UNUSED parenthesis = boost::fusion::unused_type();
  23 #ifndef BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
  24     boost::fusion::unused_type BOOST_ATTRIBUTE_UNUSED brace{};
  25     boost::fusion::unused_type BOOST_ATTRIBUTE_UNUSED list_copy = {};
  26 #endif
  27
  28     boost::fusion::unused_type copy_copy BOOST_ATTRIBUTE_UNUSED = dephault;
  29     boost::fusion::unused_type copy_direct BOOST_ATTRIBUTE_UNUSED (dephault);
  30 #ifndef BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
  31     boost::fusion::unused_type copy_copy_brace_direct BOOST_ATTRIBUTE_UNUSED = {dephault};
  32     boost::fusion::unused_type copy_direct_brace BOOST_ATTRIBUTE_UNUSED {dephault};
  33 #endif
  34
  35 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  36     boost::fusion::unused_type move_copy BOOST_ATTRIBUTE_UNUSED = std::move(dephault);
  37     boost::fusion::unused_type move_direct BOOST_ATTRIBUTE_UNUSED (std::move(dephault));
  38 #ifndef BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
  39     boost::fusion::unused_type move_copy_brace_direct BOOST_ATTRIBUTE_UNUSED = {std::move(dephault)};
  40     boost::fusion::unused_type move_direct_brace BOOST_ATTRIBUTE_UNUSED {std::move(dephault)};
  41 #endif
  42 #endif
  43
  44
  45     T value;
  46
  47     boost::fusion::unused_type T_copy_copy BOOST_ATTRIBUTE_UNUSED = value;
  48     boost::fusion::unused_type T_copy_direct BOOST_ATTRIBUTE_UNUSED (value);
  49 #ifndef BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
  50     boost::fusion::unused_type T_copy_copy_brace_direct BOOST_ATTRIBUTE_UNUSED = {value};
  51     boost::fusion::unused_type T_copy_direct_brace BOOST_ATTRIBUTE_UNUSED {value};
  52 #endif
  53
  54 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  55     boost::fusion::unused_type T_move_copy BOOST_ATTRIBUTE_UNUSED = std::move(value);
  56     boost::fusion::unused_type T_move_direct BOOST_ATTRIBUTE_UNUSED (std::move(value));
  57 #ifndef BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
  58     boost::fusion::unused_type T_move_copy_brace_direct BOOST_ATTRIBUTE_UNUSED = {std::move(value)};
  59     boost::fusion::unused_type T_move_direct_brace BOOST_ATTRIBUTE_UNUSED {std::move(value)};
  60 #endif
  61 #endif
  62 }
  63
  64 void unused_assignment()
  65 {
  66     boost::fusion::unused_type val1, val2;
  67
  68     val1 = val2;
  69 #ifndef BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
  70     val1 = {};
  71 #endif
  72 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  73     val1 = std::move(val2);
  74 #endif
  75
  76
  77     T value;
  78
  79     val1 = value;
  80 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  81     val1 = std::move(value);
  82 #endif
  83 }
  84
  85 boost::type_traits::yes_type test_unused(boost::fusion::detail::unused_only const&);
  86 boost::type_traits::no_type  test_unused(...);
  87
  88 void only_unused()
  89 {
  90     BOOST_STATIC_ASSERT((sizeof(test_unused(boost::fusion::unused)) == sizeof(boost::type_traits::yes_type)));
  91     BOOST_STATIC_ASSERT((sizeof(test_unused(0)) == sizeof(boost::type_traits::no_type)));
  92
  93     boost::fusion::unused_type my_unused;
  94     (void)my_unused;
  95     BOOST_STATIC_ASSERT((sizeof(test_unused(my_unused)) == sizeof(boost::type_traits::yes_type)));
  96 }