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

   1 // Copyright (C) 2019-2022 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-options "-std=gnu++2a" }
  19 // { dg-do compile { target c++2a } }
  20
  21 #include <algorithm>
  22 #include <array>
  23
  24 // heap
  25 constexpr std::array<int, 23>
  26 ahu{{22,
  27      21, 20,
  28      17, 16, 19, 18,//v
  29      11, 10,  9,  8, 23, 14, 13, 12, 3, 2, 1, 0, 7, 6, 5, 4}};
  30
  31 constexpr auto outq = std::is_heap_until(ahu.begin(), ahu.end());
  32
  33 constexpr auto outr = std::is_heap_until(ahu.begin(), ahu.end(),
  34                                          std::less<int>());
  35
  36 constexpr bool
  37 test()
  38 {
  39   return outq == ahu.begin() + 11 && outr == ahu.begin() + 11;
  40 }
  41
  42 static_assert(test());