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

   1 // Copyright (C) 2020-2021 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 run { target c++2a } }
  20
  21 #include <algorithm>
  22 #include <testsuite_hooks.h>
  23 #include <testsuite_iterators.h>
  24
  25 using __gnu_test::test_container;
  26 using __gnu_test::test_range;
  27 using __gnu_test::input_iterator_wrapper;
  28 using __gnu_test::forward_iterator_wrapper;
  29
  30 namespace ranges = std::ranges;
  31
  32 void
  33 test01()
  34 {
  35   int x[] = {2,4,6,1,3,5};
  36   test_container<int, forward_iterator_wrapper> cx(x);
  37   VERIFY( ranges::is_partitioned(cx, [] (int a) { return a%2==0; }) );
  38
  39   test_range<int, input_iterator_wrapper> rx(x);
  40   VERIFY( ranges::is_partitioned(rx,
  41                                  [] (int a) { return a%2==1; },
  42                                  [] (int a) { return a+1; }) );
  43 }
  44
  45 constexpr bool
  46 test02()
  47 {
  48   int x[] = {1,2,3,4,5,6,1};
  49   return (ranges::is_partitioned(x, x+6, [] (int a) { return a<=2; })
  50           && !ranges::is_partitioned(x, x+7, [] (int a) { return a<=2; }));
  51 }
  52
  53 int
  54 main()
  55 {
  56   test01();
  57   static_assert(test02());
  58 }