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

   1 // { dg-options "-std=gnu++11" }
   2 // { dg-do compile }
   3 // 2009-11-12  Paolo Carlini  <paolo.carlini@oracle.com>
   4 //
   5 // Copyright (C) 2009-2013 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12 //
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU General Public License along
  19 // with this library; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  21
  22 #include <type_traits>
  23
  24 // DR 1255.
  25 void test01()
  26 {
  27   using std::common_type;
  28   using std::is_same;
  29
  30   static_assert( is_same<common_type<void>::type, void>(),
  31                  "common_type<void>" );
  32   static_assert( is_same<common_type<const void>::type, void>(),
  33                  "common_type<const void>" );
  34   static_assert( is_same<common_type<volatile void>::type, void>(),
  35                  "common_type<volatile void>" );
  36   static_assert( is_same<common_type<const volatile void>::type, void>(),
  37                  "common_type<const volatile void>" );
  38
  39   static_assert( is_same<common_type<void, void>::type, void>(),
  40                  "common_type<void, void>" );
  41   static_assert( is_same<common_type<void, const void>::type, void>(),
  42                  "common_type<void, const void>" );
  43   static_assert( is_same<common_type<void, volatile void>::type, void>(),
  44                  "common_type<void, volatile void>" );
  45   static_assert( is_same<common_type<void, const volatile void>::type, void>(),
  46                  "common_type<void, const volatile void>" );
  47   static_assert( is_same<common_type<const void, void>::type, void>(),
  48                  "common_type<const void, void>" );
  49   static_assert( is_same<common_type<const void, const void>::type, void>(),
  50                  "common_type<const void, const void>" );
  51   static_assert( is_same<common_type<const void, volatile void>::type, void>(),
  52                  "common_type<const void, volatile void>" );
  53   static_assert( is_same<common_type<const void, const volatile void>::type,
  54                    void>(), "common_type<const void, const volatile void>" );
  55   static_assert( is_same<common_type<volatile void, void>::type, void>(),
  56                  "common_type<volatile void, void>" );
  57   static_assert( is_same<common_type<volatile void, volatile void>::type,
  58                    void>(), "common_type<volatile void, volatile void>" );
  59   static_assert( is_same<common_type<volatile void, const void>::type,
  60                    void>(), "common_type<volatile void, const void>" );
  61   static_assert( is_same<common_type<volatile void, const volatile void>::type,
  62                    void>(), "common_type<volatile void, const volatile void>" );
  63   static_assert( is_same<common_type<const volatile void, void>::type, void>(),
  64                  "common_type<const volatile void, const volatile void>" );
  65   static_assert( is_same<common_type<const volatile void, const void>::type,
  66                    void>(), "common_type<const volatile void, const void>" );
  67   static_assert( is_same<common_type<const volatile void, volatile void>::type,
  68                    void>(), "common_type<const volatile void, volatile void>" );
  69   static_assert( is_same<common_type<const volatile void, const volatile void>::type,
  70                    void>(),
  71                  "common_type<const volatile void, const volatile void>" );
  72 }