libstdc++-v3/testsuite/23_containers/array/tuple_interface/tuple_element_cpp14.cc

   1 // { dg-do compile { target c++14 } }
   2 //
   3 // Copyright (C) 2015-2020 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 #include <array>
  21 #include <type_traits>
  22 #include <testsuite_hooks.h>
  23
  24 void
  25 test01()
  26 {
  27   using namespace std;
  28
  29   const size_t len = 3;
  30   typedef array<int, len> array_type;
  31
  32   static_assert(is_same<tuple_element_t<0, array_type>, int>::value, "");
  33   static_assert(is_same<tuple_element_t<1, array_type>, int>::value, "");
  34   static_assert(is_same<tuple_element_t<2, array_type>, int>::value, "");
  35
  36   static_assert(is_same<tuple_element_t<0, const array_type>,
  37                 const int>::value, "");
  38   static_assert(is_same<tuple_element_t<1, const array_type>,
  39                 const int>::value, "");
  40   static_assert(is_same<tuple_element_t<2, const array_type>,
  41                 const int>::value, "");
  42
  43   static_assert(is_same<tuple_element_t<0, volatile array_type>,
  44                 volatile int>::value, "");
  45   static_assert(is_same<tuple_element_t<1, volatile array_type>,
  46                 volatile int>::value, "");
  47   static_assert(is_same<tuple_element_t<2, volatile array_type>,
  48                 volatile int>::value, "");
  49
  50   static_assert(is_same<tuple_element_t<0, const volatile array_type>,
  51                 const volatile int>::value, "");
  52   static_assert(is_same<tuple_element_t<1, const volatile array_type>,
  53                 const volatile int>::value, "");
  54   static_assert(is_same<tuple_element_t<2, const volatile array_type>,
  55                 const volatile int>::value, "");
  56 }
  57
  58 int main()
  59 {
  60   test01();
  61   return 0;
  62 }