libstdc++-v3/testsuite/24_iterators/input/tag.cc

   1 // Copyright (C) 2019-2022 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-do compile { target c++11 } }
  19
  20 #include <iterator>
  21
  22 using std::input_iterator_tag;
  23 using std::output_iterator_tag;
  24 using std::iterator_traits;
  25
  26 static_assert( std::is_empty<input_iterator_tag>::value );
  27 static_assert( std::is_trivially_copy_constructible<input_iterator_tag>::value );
  28
  29 static_assert( ! std::is_base_of<output_iterator_tag,
  30                                  input_iterator_tag>::value );
  31 static_assert( ! std::is_convertible<input_iterator_tag*,
  32                                      output_iterator_tag*>::value );