libstdc++-v3/testsuite/23_containers/array/requirements/constexpr_swap.cc

   1 // { dg-do compile { target c++20 } }
   2 //
   3 // Copyright (C) 2019-2025 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 constexpr bool
  23 test_array()
  24 {
  25   auto ok = true;
  26
  27   std::array<float,3> fa{{1.1f, 2.2f, 3.3f}};
  28
  29   std::array<float,3> fb{{4.4f, 5.5f, 6.6f}};
  30
  31   fb.swap(fa);
  32
  33   ok = ok && (fa[0] == 4.4f);
  34
  35   std::swap(fa, fb);
  36
  37   ok = ok && (fa[0] == 1.1f);
  38
  39   return ok;
  40 }
  41
  42 static_assert(test_array());