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

   1 // Copyright (C) 2019-2024 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
  20 #include <algorithm>
  21 #include <array>
  22
  23 constexpr bool
  24 test()
  25 {
  26   auto ok = true;
  27
  28   std::array<int, 23>
  29   ah{{0,
  30       1, 2,
  31       3, 4, 5, 6,
  32       7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22}};
  33
  34   std::make_heap(ah.begin(), ah.end() - 3);
  35   ok = ok && std::is_heap(ah.begin(), ah.end() - 3);
  36
  37   std::push_heap(ah.begin(), ah.end() - 2);
  38   std::push_heap(ah.begin(), ah.end() - 1);
  39   std::push_heap(ah.begin(), ah.end());
  40   ok = ok && std::is_heap(ah.begin(), ah.end());
  41
  42   return ok;
  43 }
  44
  45 static_assert(test());