libstdc++-v3/testsuite/23_containers/array/element_access/constexpr_element_access.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2011-2022 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
  22 void test01()
  23 {
  24   // array
  25   constexpr std::array<std::size_t, 6> a = { { 0, 55, 66, 99, 4115, 2 } };
  26   constexpr auto v1 = a[1];
  27   constexpr auto v2 = a.at(2);
  28   constexpr auto v3 = a.front();
  29   constexpr auto v4 = a.back();
  30   static_assert( (v1 + v2 + v3 + v4) == (55 + 66 + 0 + 2), "" );
  31 }