libstdc++-v3/testsuite/25_algorithms/is_partitioned/constrained.cc

   1 // Copyright (C) 2020-2025 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 run { target c++20 } }
  19
  20 #include <algorithm>
  21 #include <testsuite_hooks.h>
  22 #include <testsuite_iterators.h>
  23
  24 using __gnu_test::test_container;
  25 using __gnu_test::test_range;
  26 using __gnu_test::input_iterator_wrapper;
  27 using __gnu_test::forward_iterator_wrapper;
  28
  29 namespace ranges = std::ranges;
  30
  31 void
  32 test01()
  33 {
  34   int x[] = {2,4,6,1,3,5};
  35   test_container<int, forward_iterator_wrapper> cx(x);
  36   VERIFY( ranges::is_partitioned(cx, [] (int a) { return a%2==0; }) );
  37
  38   test_range<int, input_iterator_wrapper> rx(x);
  39   VERIFY( ranges::is_partitioned(rx,
  40                                  [] (int a) { return a%2==1; },
  41                                  [] (int a) { return a+1; }) );
  42 }
  43
  44 constexpr bool
  45 test02()
  46 {
  47   int x[] = {1,2,3,4,5,6,1};
  48   return (ranges::is_partitioned(x, x+6, [] (int a) { return a<=2; })
  49           && !ranges::is_partitioned(x, x+7, [] (int a) { return a<=2; }));
  50 }
  51
  52 int
  53 main()
  54 {
  55   test01();
  56   static_assert(test02());
  57 }