libstdc++-v3/testsuite/25_algorithms/rotate/constexpr.cc

   1 //
   2 // This file is part of the GNU ISO C++ Library.  This library is free
   3 // software; you can redistribute it and/or modify it under the
   4 // terms of the GNU General Public License as published by the
   5 // Free Software Foundation; either version 3, or (at your option)
   6 // any later version.
   7
   8 // This library is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 // GNU General Public License for more details.
  12
  13 // You should have received a copy of the GNU General Public License along
  14 // with this library; see the file COPYING3.  If not see
  15 // <http://www.gnu.org/licenses/>.
  16
  17 // { dg-options "-std=gnu++2a" }
  18 // { dg-do compile { target c++2a } }
  19
  20 #include <algorithm>
  21 #include <array>
  22
  23 constexpr bool
  24 test()
  25 {
  26   auto ok = true;
  27
  28   std::array<int, 12> ar0{{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}};
  29
  30   std::rotate(ar0.begin(), ar0.begin() + 5, ar0.end());
  31
  32   return ar0[0] == 5 && ar0[5] == 10;
  33 }
  34
  35 static_assert(test());