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

   1 // Copyright (C) 2020-2023 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_range;
  25 using __gnu_test::test_container;
  26 using __gnu_test::bidirectional_iterator_wrapper;
  27
  28 namespace ranges = std::ranges;
  29
  30 void
  31 test01()
  32 {
  33   int x[] = { 1, 2, 3, 4 };
  34   int w[4];
  35   test_container<int, bidirectional_iterator_wrapper> cx(x), cw(w);
  36   const int y[] = { 4, 3, 2, 1 };
  37
  38   auto [in,out] = ranges::reverse_copy(cx, cw.begin());
  39   VERIFY( in == ranges::end(cx) && out == cw.end() );
  40   VERIFY( ranges::equal(cw, y) );
  41 }
  42
  43 void
  44 test02()
  45 {
  46   int x[] = { 1, 2, 3, 4, 5 };
  47   int w[5];
  48   test_range<int, bidirectional_iterator_wrapper> rx(x), rw(w);
  49   const int y[] = { 5, 4, 3, 2, 1 };
  50
  51   auto [in,out] = ranges::reverse_copy(rx, ranges::begin(rw));
  52   VERIFY( in == ranges::end(rx) && out == ranges::end(rw) );
  53   VERIFY( ranges::equal(rw, y) );
  54 }
  55
  56 constexpr bool
  57 test03()
  58 {
  59   const int x[] = { 1, 2, 3 };
  60   int w[2];
  61   const int y[] = { 2, 1 };
  62   ranges::reverse_copy(x, x+2, w);
  63   return ranges::equal(w, y);
  64 }
  65
  66 int
  67 main()
  68 {
  69   test01();
  70   test02();
  71
  72   static_assert(test03());
  73 }