text: // { dg-do run { target c++11 } }
  
  //
  // 2014-01-07  Tim Shen <timshen91@gmail.com>
  //
  // Copyright (C) 2010-2017 Free Software Foundation, Inc.
  //
  // This file is part of the GNU ISO C++ Library.  This library is free
  // software; you can redistribute it and/or modify it under the
  // terms of the GNU General Public License as published by the
  // Free Software Foundation; either version 3, or (at your option)
  // any later version.
  //
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU General Public License for more details.
  //
  // You should have received a copy of the GNU General Public License along
  // with this library; see the file COPYING3.  If not see
  // <http://www.gnu.org/licenses/>.
  
  // 28.3 Requirements [re.req]
  // 28.2 (4) Table 127 - Regular expression traits class requirements
  // 28.7 Class template regex_traits [re.traits]
  
  #include <regex>
  #include <string>
  #include <testsuite_hooks.h>
  
  using namespace std;
  
  template<typename CharT>
    class MyRegexTraits
    : public regex_traits<CharT>
    {
    public:
      CharT
      translate(CharT c) const
      {
        return c+1;
      }
    };
  
  void
  test01()
  {
    basic_regex<wchar_t, MyRegexTraits<wchar_t>> re(L".");
    VERIFY(!regex_match(L"\n", re));
    VERIFY(!regex_match(L"\r", re));
    VERIFY(!regex_match(L"\u2028", re));
    VERIFY(!regex_match(L"\u2029", re));
  }
  
  struct MyCtype : std::ctype<wchar_t>
  {
    char
    do_narrow(wchar_t c, char dflt) const override
    {
      if (c >= 256)
        return dflt;
      return ((char)c)+1;
    }
  };
  
  void
  test02()
  {
    std::locale loc(std::locale(), new MyCtype);
    std::regex_traits<wchar_t> traits;
    traits.imbue(loc);
    wchar_t wch = L'p';
    VERIFY(traits.lookup_collatename(&wch, &wch+1) == L"q");
    std::wstring ws = L"chfhs"; // chars of "digit" shifted by 1.
    VERIFY(traits.lookup_classname(ws.begin(), ws.end()) != 0);
  }
  
  int main()
  {
    test01();
    test02();
    return 0;
  }
  