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

   1 // Copyright (C) 2020-2022 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 result = ranges::upper_bound(std::next(cx.begin(), i),
  40                                           std::next(cx.begin(), j),
  41                                           4, {}, [] (int a) { return a-1; });
  42         VERIFY( result.ptr == x+6 );
  43       }
  44
  45   ranges::reverse(x);
  46   test_range<int, forward_iterator_wrapper> rx(x);
  47   auto result = ranges::upper_bound(rx, 5, ranges::greater{},
  48                                     [] (int a) { return a+1; });
  49   VERIFY( result.ptr == x+5 );
  50 }
  51
  52 constexpr bool
  53 test02()
  54 {
  55   int x[] = {1, 2, 3, 4, 5};
  56   return (ranges::upper_bound(x, 6) == x+5
  57           && ranges::upper_bound(x, x, 6) == x
  58           && ranges::upper_bound(x, 1) == x+1);
  59 }
  60
  61 int
  62 main()
  63 {
  64   test01();
  65   static_assert(test02());
  66 }