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

   1 // Copyright (C) 2019-2023 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 #include <functional>
  24
  25 constexpr bool
  26 test()
  27 {
  28   std::array<int, 12> ar1{{0, 1, 2, 3, 4, 5, 6, 6, 8, 9, 9, 11}};
  29   std::array<int, 12> ar2{{0, 1, 2, 3, 4, 5, 6, 6, 8, 9, 9, 11}};
  30
  31   const auto out33 = std::unique(ar1.begin(), ar1.end());
  32
  33   const auto out44 = std::unique(ar2.begin(), ar2.end(), std::equal_to<int>());
  34
  35   return out33 == ar1.begin() + 10 && out44 == ar2.begin() + 10;
  36 }
  37
  38 static_assert(test());