libstdc++-v3/testsuite/25_algorithms/find_first_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, 12> ca0{{0, 1, 2, 3, 4, 5, 6,  7,  8,  9, 10, 11}};
  24 constexpr std::array<int, 12> cas{{3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}};
  25
  26 constexpr auto outh = std::find_first_of(ca0.begin(), ca0.end(),
  27                                          cas.begin(), cas.end());
  28
  29 constexpr auto outi = std::find_first_of(ca0.begin(), ca0.end(),
  30                                          cas.begin(), cas.end(),
  31                                         [](int i, int j){ return i + 1 == j; });
  32
  33 constexpr bool
  34 test()
  35 {
  36   return outh == ca0.begin() + 3 && outi == ca0.begin() + 2;
  37 }
  38
  39 static_assert(test());