libstdc++-v3/testsuite/22_locale/global_templates/user_facet_hierarchies.cc

   1 // Copyright (C) 2007, 2008 Free Software Foundation
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 2, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING.  If not, write to the Free
  16 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  17 // USA.
  18
  19 #include <string>
  20 #include <locale>
  21 #include <testsuite_hooks.h>
  22
  23 // Based on Langer Kreft "Standard C++ IOStreams and Locales" p 316-318
  24 struct base_facet: public std::locale::facet
  25 {
  26   virtual std::string msg() const
  27   { return "base class"; }
  28
  29   static std::locale::id id;
  30 };
  31
  32 std::locale::id base_facet::id;
  33
  34
  35 struct derived_facet: public base_facet
  36 {
  37   virtual std::string msg() const
  38   { return "derived class"; }
  39
  40   virtual std::string msg_repeater() const
  41   { return "derived class derived class"; }
  42
  43 };
  44
  45 // PR libstdc++/30127
  46 // PR libstdc++/34449
  47 int main()
  48 {
  49   bool test __attribute__((unused)) = true;
  50
  51   using std::locale;
  52   using std::has_facet;
  53   using std::use_facet;
  54
  55   locale loc_c = locale::classic();
  56   locale loc_base(loc_c, new base_facet);
  57   locale loc_derived(loc_c, new derived_facet);
  58
  59   // Standard facets.
  60   VERIFY( has_facet<std::ctype<char> >(loc_c) );
  61   VERIFY( has_facet<std::ctype<char> >(loc_base) );
  62   VERIFY( has_facet<std::ctype<char> >(loc_derived) );
  63
  64   // User defined base facet.
  65   VERIFY( !has_facet<base_facet>(loc_c) );
  66   VERIFY( has_facet<base_facet>(loc_base) );
  67   VERIFY( has_facet<base_facet>(loc_derived) );
  68
  69   // User defined derived facet.
  70   VERIFY( !has_facet<derived_facet>(loc_c) );
  71   VERIFY( !has_facet<derived_facet>(loc_base) );
  72   VERIFY( has_facet<derived_facet>(loc_derived) );
  73
  74
  75   // 1
  76   try
  77     {
  78       if (has_facet<derived_facet>(loc_base))
  79         {
  80           use_facet<derived_facet>(loc_base).msg_repeater();
  81           VERIFY( false );
  82         }
  83     }
  84   catch (...)
  85     {
  86       // Expect no exception.
  87       VERIFY( true );
  88     }
  89
  90   // 2
  91   try
  92     {
  93       if (has_facet<base_facet>(loc_derived))
  94         use_facet<base_facet>(loc_derived).msg();
  95       else
  96         VERIFY( true );
  97     }
  98   catch (...)
  99     {
 100       // Expect no exception.
 101       VERIFY( true );
 102     }
 103
 104   return 0;
 105 }