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

   1 // Copyright (C) 2020-2024 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   float x[] = {1, 2, 3, 4, 5, 5, 6, 7};
  34   test_container<float, forward_iterator_wrapper> cx(x);
  35   for (int i = 0; i < 7; i++)
  36     {
  37       VERIFY( ranges::binary_search(cx, i, {}, [] (int a) { return a-1; }) );
  38       VERIFY( !ranges::binary_search(cx.begin(), cx.end(), i+0.5) );
  39     }
  40   VERIFY( !ranges::binary_search(cx, 0) );
  41
  42   ranges::reverse(x);
  43   test_range<float, forward_iterator_wrapper> rx(x);
  44   VERIFY( ranges::binary_search(rx, 5, ranges::greater{}) );
  45 }
  46
  47 constexpr bool
  48 test02()
  49 {
  50   int x[] = {1, 2, 3};
  51   return (ranges::binary_search(x, 3)
  52           && !ranges::binary_search(x, x, 3));
  53 }
  54
  55 int
  56 main()
  57 {
  58   test01();
  59   static_assert(test02());
  60 }