libstdc++-v3/testsuite/experimental/iterator/requirements.cc

   1 // Copyright (C) 2015-2024 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 compile { target c++14 } }
  19
  20 // This is a compile-only test with minimal includes
  21 #include <experimental/iterator>
  22 #include <iosfwd> // No guarantee that <experimental/iterator> includes this!
  23
  24 using namespace std::experimental;
  25
  26 template<typename Delim, typename Char>
  27 struct tester
  28 {
  29   using joiner_type = ostream_joiner<Delim, Char>;
  30   using ostream_type = std::basic_ostream<Char>;
  31   using test_type = decltype(make_ostream_joiner(std::declval<ostream_type&>(),
  32                                                  std::declval<Delim>()));
  33
  34   static_assert(is_same_v<test_type, joiner_type>, "");
  35
  36   static_assert(is_same_v<typename test_type::char_type, Char>, "");
  37
  38   static_assert(is_same_v<typename test_type::traits_type,
  39                           std::char_traits<Char>>, "");
  40
  41   static_assert(is_same_v<typename test_type::ostream_type, ostream_type>, "");
  42
  43   static_assert(is_same_v<typename test_type::iterator_category,
  44                           std::output_iterator_tag>, "");
  45
  46   static_assert(is_same_v<typename test_type::value_type,        void>, "");
  47   static_assert(is_same_v<typename test_type::difference_type,   void>, "");
  48   static_assert(is_same_v<typename test_type::pointer,           void>, "");
  49   static_assert(is_same_v<typename test_type::reference,         void>, "");
  50 };
  51
  52 tester<char, char> cc;
  53 tester<int, char> ic;
  54 #if _GLIBCXX_USE_WCHAR_T
  55 tester<wchar_t, wchar_t> ww;
  56 tester<int, wchar_t> iw;
  57 #endif
  58
  59 std::ostream& os();
  60
  61 // Ensure that contents of <iterator> are defined by <experimental/iterator>:
  62 std::reverse_iterator<int*> ii;
  63 std::move_iterator<int*> mi;
  64 std::istream_iterator<int> isi;
  65 std::ostream_iterator<int> osi(os());
  66 std::istreambuf_iterator<char> isbi;
  67
  68 #include <ostream>
  69 std::ostreambuf_iterator<char> osbi(os());