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

   1 // Copyright (C) 2019-2025 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 std::array<int, 6> cae{{0, 2, 4, 6, 8, 10}};
  24
  25 constexpr auto out1 = std::all_of(cae.begin(), cae.end(),
  26                                   [](int i){ return i % 2 == 0; });
  27
  28 static_assert(out1);
  29
  30 constexpr auto out2 = std::all_of(cae.begin(), cae.end(),
  31                                   [](int i){ return i != 8; });
  32
  33 static_assert(!out2);