libstdc++-v3/testsuite/25_algorithms/copy_backward/debug/constexpr_neg.cc

   1 // Copyright (C) 2020-2024 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do compile { target c++20 } }
  19 // { dg-require-debug-mode ""  }
  20
  21 #include <algorithm>
  22 #include <array>
  23
  24 constexpr bool
  25 test()
  26 {
  27   constexpr std::array<int, 12> ca0{{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}};
  28   std::array<int, 12> ma0{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}};
  29
  30   const auto out7 = std::copy_backward(ca0.begin() + 8, ca0.begin(),
  31                                        ma0.begin() + 10);
  32
  33   return true;
  34 }
  35
  36 static_assert(test()); // { dg-error "non-constant condition" }
  37
  38 // { dg-prune-output "in 'constexpr' expansion" }
  39 // { dg-prune-output "builtin_unreachable" }