libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/requirements/base_classes.cc

   1 // { dg-do compile }
   2 // 1999-06-28 bkoz
   3
   4 // Copyright (C) 1999-2022 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // 24.5.3 template class istreambuf_iterator
  22
  23 #include <sstream>
  24 #include <iterator>
  25 #include <testsuite_hooks.h>
  26
  27 void test01()
  28 {
  29   using namespace std;
  30
  31   // Check for required base class.
  32   typedef istreambuf_iterator<char> test_iterator;
  33   typedef char_traits<char>::off_type off_type;
  34
  35   // This is the base class required since LWG 445, which differs from C++03.
  36   // We derive from this unconditionally, then override 'reference' for C++03.
  37   typedef iterator<input_iterator_tag, char, off_type, char*, char> // { dg-warning "is deprecated" "" { target c++17 } }
  38     base_iterator;
  39
  40   istringstream isstream("this tag");
  41   test_iterator  r_it(isstream);
  42   base_iterator* base __attribute__((unused)) = &r_it;
  43 }