libstdc++-v3/testsuite/22_locale/numpunct/members/wchar_t/cache_1.cc

   1 // 2003-07-06  Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2003 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 2, 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 COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 #include <locale>
  22 #include <sstream>
  23 #include <ostream>
  24 #include <testsuite_hooks.h>
  25
  26 class numpunct_checked : public std::numpunct<wchar_t>
  27 {
  28   typedef std::numpunct<wchar_t> base;
  29
  30 public:
  31   explicit
  32   numpunct_checked(std::size_t refs = 0): base(refs) { }
  33
  34   string_type
  35   base_truename() const
  36   { return base::do_truename(); }
  37
  38 protected:
  39   virtual string_type
  40   do_truename() const
  41   { return base::do_truename() + L"st"; }
  42 };
  43
  44 // Thwart locale caching strategies that incorrectly overwrite base
  45 // class data.
  46 void test01()
  47 {
  48   using namespace std;
  49
  50   bool test __attribute__((unused)) = true;
  51   const wstring         basestr(L"true");
  52   const wstring         derivedstr(L"truest");
  53
  54   const locale  loc(locale::classic(), new numpunct_checked);
  55   wstringbuf    sbuf;
  56   wostream      os(&sbuf);
  57   os.setf(ios_base::boolalpha);
  58
  59   // Pre-cache sanity check.
  60   const numpunct<wchar_t>& np = use_facet<numpunct<wchar_t> >(loc);
  61   VERIFY( np.truename() == derivedstr );
  62
  63   // Cache.
  64   os.imbue(loc);
  65   os << true;
  66   VERIFY( sbuf.str() == derivedstr );
  67
  68   // Post-cache sanity check, make sure that base class is still fine.
  69   VERIFY( np.truename() == derivedstr );
  70   const numpunct_checked& npd = static_cast<const numpunct_checked&>(np);
  71   VERIFY( npd.base_truename() == basestr );
  72 }
  73
  74 int main()
  75 {
  76   test01();
  77   return 0;
  78 }