libstdc++-v3/testsuite/25_algorithms/equal_range/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::forward_iterator_wrapper;
  28
  29 namespace ranges = std::ranges;
  30
  31 void
  32 test01()
  33 {
  34   int x[] = {1, 2, 3, 4, 5, 5, 6, 7};
  35   for (unsigned i = 0; i < 5; i++)
  36     for (unsigned j = 6; j < 8; j++)
  37       {
  38         test_container<int, forward_iterator_wrapper> cx(x);
  39         auto range = ranges::equal_range(std::next(cx.begin(), i),
  40                                          std::next(cx.begin(), j),
  41                                          4, {}, [] (int a) { return a-1; });
  42         VERIFY( range.begin().ptr == x+4 && range.end().ptr == x+6 );
  43       }
  44
  45   ranges::reverse(x);
  46   test_range<int, forward_iterator_wrapper> rx(x);
  47   auto range = ranges::equal_range(rx, 5, ranges::greater{},
  48                                    [] (int a) { return a+1; });
  49   VERIFY( range.begin().ptr == x+4 && range.end().ptr == x+5 );
  50 }
  51
  52 constexpr bool
  53 test02()
  54 {
  55   int x[] = {1, 2, 3, 4, 5};
  56   auto range1 = ranges::equal_range(x, 6);
  57   auto range2 = ranges::equal_range(x, x, 6);
  58   auto range3 = ranges::equal_range(x, 1);
  59   return (range1.begin() == x+5 && range1.end() == x+5
  60           && range2.begin() == x && range2.end() == x
  61           && range3.begin() == x && range3.end() == x+1);
  62 }
  63
  64 int
  65 main()
  66 {
  67   test01();
  68   static_assert(test02());
  69 }