libstdc++-v3/testsuite/20_util/common_type/requirements/typedefs-2.cc

   1 // { dg-do compile { target c++11 } }
   2 // 2009-11-12  Paolo Carlini  <paolo.carlini@oracle.com>
   3 //
   4 // Copyright (C) 2009-2024 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <type_traits>
  22
  23 // DR 1255.
  24 void test01()
  25 {
  26   using std::common_type;
  27   using std::is_same;
  28
  29   static_assert( is_same<common_type<void>::type, void>(),
  30                  "common_type<void>" );
  31   static_assert( is_same<common_type<const void>::type, void>(),
  32                  "common_type<const void>" );
  33   static_assert( is_same<common_type<volatile void>::type, void>(),
  34                  "common_type<volatile void>" );
  35   static_assert( is_same<common_type<const volatile void>::type, void>(),
  36                  "common_type<const volatile void>" );
  37
  38   static_assert( is_same<common_type<void, void>::type, void>(),
  39                  "common_type<void, void>" );
  40   static_assert( is_same<common_type<void, const void>::type, void>(),
  41                  "common_type<void, const void>" );
  42   static_assert( is_same<common_type<void, volatile void>::type, void>(),
  43                  "common_type<void, volatile void>" );
  44   static_assert( is_same<common_type<void, const volatile void>::type, void>(),
  45                  "common_type<void, const volatile void>" );
  46   static_assert( is_same<common_type<const void, void>::type, void>(),
  47                  "common_type<const void, void>" );
  48   static_assert( is_same<common_type<const void, const void>::type, void>(),
  49                  "common_type<const void, const void>" );
  50   static_assert( is_same<common_type<const void, volatile void>::type, void>(),
  51                  "common_type<const void, volatile void>" );
  52   static_assert( is_same<common_type<const void, const volatile void>::type,
  53                    void>(), "common_type<const void, const volatile void>" );
  54   static_assert( is_same<common_type<volatile void, void>::type, void>(),
  55                  "common_type<volatile void, void>" );
  56   static_assert( is_same<common_type<volatile void, volatile void>::type,
  57                    void>(), "common_type<volatile void, volatile void>" );
  58   static_assert( is_same<common_type<volatile void, const void>::type,
  59                    void>(), "common_type<volatile void, const void>" );
  60   static_assert( is_same<common_type<volatile void, const volatile void>::type,
  61                    void>(), "common_type<volatile void, const volatile void>" );
  62   static_assert( is_same<common_type<const volatile void, void>::type, void>(),
  63                  "common_type<const volatile void, const volatile void>" );
  64   static_assert( is_same<common_type<const volatile void, const void>::type,
  65                    void>(), "common_type<const volatile void, const void>" );
  66   static_assert( is_same<common_type<const volatile void, volatile void>::type,
  67                    void>(), "common_type<const volatile void, volatile void>" );
  68   static_assert( is_same<common_type<const volatile void, const volatile void>::type,
  69                    void>(),
  70                  "common_type<const volatile void, const volatile void>" );
  71 }