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

   1 // { dg-do compile { target c++11 } }
   2 //
   3 // Copyright (C) 2011-2023 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10 //
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 //
  21 // NB: This file is for testing type_traits with NO OTHER INCLUDES.
  22
  23 #include <type_traits>
  24
  25 void test01()
  26 {
  27   using namespace std;
  28
  29   enum E1 : unsigned { };
  30   enum E2 : char { };
  31   enum class E3 { };
  32   enum class E4 : unsigned char { c = 1 };
  33   enum class E5 : int { a = -1, b = 1 };
  34   enum class E6 : long { c = __LONG_MAX__ };
  35
  36   static_assert(is_same<underlying_type<E1>::type, unsigned>::value, "Error");
  37   static_assert(is_same<underlying_type<E2>::type, char>::value, "Error");
  38   static_assert(is_same<underlying_type<E3>::type, int>::value, "Error");
  39   static_assert(is_same<underlying_type<E4>::type,
  40                         unsigned char>::value, "Error");
  41   static_assert(is_same<underlying_type<E5>::type, int>::value, "Error");
  42   static_assert(is_same<underlying_type<E6>::type, long>::value, "Error");
  43 }