libstdc++-v3/testsuite/21_strings/basic_string/inserters_extractors/wchar_t/4.cc

   1 // 1999-07-01 bkoz
   2
   3 // Copyright (C) 1999-2021 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 21.3.7.9 inserters and extractors
  21
  22 // NB: This file is predicated on sstreams, istreams, and ostreams
  23 // working, not to mention other major details like char_traits, and
  24 // all of the string class.
  25
  26 #include <string>
  27 #include <sstream>
  28 #include <testsuite_hooks.h>
  29
  30 // testing basic_stringbuf::xsputn via stress testing with large strings
  31 // based on a bug report libstdc++ 9
  32 void test04(std::size_t size)
  33 {
  34   std::wstring str(size, L's');
  35   std::size_t expected_size = 2 * (size + 1);
  36   std::wostringstream oss(str);
  37
  38   // sanity checks
  39   VERIFY( str.size() == size );
  40   VERIFY( oss.good() );
  41
  42   // stress test
  43   oss << str << std::endl;
  44   if (!oss.good())
  45     VERIFY( false );
  46
  47   oss << str << std::endl;
  48   if (!oss.good())
  49     VERIFY( false );
  50
  51   VERIFY( str.size() == size );
  52   VERIFY( oss.good() );
  53   std::wstring str_tmp = oss.str();
  54   VERIFY( str_tmp.size() == expected_size );
  55 }
  56
  57 int main()
  58 {
  59   test04(1); // expected_size == 4
  60   test04(1000); // expected_size == 2002
  61   test04(10000); // expected_size == 20002
  62   return 0;
  63 }