libstdc++-v3/testsuite/25_algorithms/equal_range/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::forward_iterator_wrapper;
  27
  28 namespace ranges = std::ranges;
  29
  30 void
  31 test01()
  32 {
  33   int x[] = {1, 2, 3, 4, 5, 5, 6, 7};
  34   for (unsigned i = 0; i < 5; i++)
  35     for (unsigned j = 6; j < 8; j++)
  36       {
  37         test_container<int, forward_iterator_wrapper> cx(x);
  38         auto range = ranges::equal_range(std::next(cx.begin(), i),
  39                                          std::next(cx.begin(), j),
  40                                          4, {}, [] (int a) { return a-1; });
  41         VERIFY( range.begin().ptr == x+4 && range.end().ptr == x+6 );
  42       }
  43
  44   ranges::reverse(x);
  45   test_range<int, forward_iterator_wrapper> rx(x);
  46   auto range = ranges::equal_range(rx, 5, ranges::greater{},
  47                                    [] (int a) { return a+1; });
  48   VERIFY( range.begin().ptr == x+4 && range.end().ptr == x+5 );
  49 }
  50
  51 constexpr bool
  52 test02()
  53 {
  54   int x[] = {1, 2, 3, 4, 5};
  55   auto range1 = ranges::equal_range(x, 6);
  56   auto range2 = ranges::equal_range(x, x, 6);
  57   auto range3 = ranges::equal_range(x, 1);
  58   return (range1.begin() == x+5 && range1.end() == x+5
  59           && range2.begin() == x && range2.end() == x
  60           && range3.begin() == x && range3.end() == x+1);
  61 }
  62
  63 int
  64 main()
  65 {
  66   test01();
  67   static_assert(test02());
  68 }