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

   1 // 2003-07-06  Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2003-2024 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 #include <locale>
  21 #include <sstream>
  22 #include <ostream>
  23 #include <testsuite_hooks.h>
  24
  25 class numpunct_checked : public std::numpunct<char>
  26 {
  27   typedef std::numpunct<char> base;
  28
  29 public:
  30   explicit
  31   numpunct_checked(std::size_t refs = 0): base(refs) { }
  32
  33   string_type
  34   base_truename() const
  35   { return base::do_truename(); }
  36
  37 protected:
  38   virtual string_type
  39   do_truename() const
  40   { return base::do_truename() + "st"; }
  41 };
  42
  43 // Thwart locale caching strategies that incorrectly overwrite base
  44 // class data.
  45 void test01()
  46 {
  47   using namespace std;
  48
  49   const string  basestr("true");
  50   const string  derivedstr("truest");
  51
  52   const locale  loc(locale::classic(), new numpunct_checked);
  53   stringbuf     sbuf;
  54   ostream       os(&sbuf);
  55   os.setf(ios_base::boolalpha);
  56
  57   // Pre-cache sanity check.
  58   const numpunct<char>& np = use_facet<numpunct<char> >(loc);
  59   VERIFY( np.truename() == derivedstr );
  60
  61   // Cache.
  62   os.imbue(loc);
  63   os << true;
  64   VERIFY( sbuf.str() == derivedstr );
  65
  66   // Post-cache sanity check, make sure that base class is still fine.
  67   VERIFY( np.truename() == derivedstr );
  68   const numpunct_checked& npd = static_cast<const numpunct_checked&>(np);
  69   VERIFY( npd.base_truename() == basestr );
  70 }
  71
  72 int main()
  73 {
  74   test01();
  75   return 0;
  76 }