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

   1 // Copyright (C) 2007, 2008, 2009 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 3, 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 COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 #include <string>
  19 #include <locale>
  20 #include <testsuite_hooks.h>
  21
  22 // Based on Langer Kreft "Standard C++ IOStreams and Locales" p 316-318
  23 struct base_facet: public std::locale::facet
  24 {
  25   virtual std::string msg() const
  26   { return "base class"; }
  27
  28   static std::locale::id id;
  29 };
  30
  31 std::locale::id base_facet::id;
  32
  33
  34 struct derived_facet: public base_facet
  35 {
  36   virtual std::string msg() const
  37   { return "derived class"; }
  38
  39   virtual std::string msg_repeater() const
  40   { return "derived class derived class"; }
  41
  42 };
  43
  44 // PR libstdc++/30127
  45 // PR libstdc++/34449
  46 int main()
  47 {
  48   bool test __attribute__((unused)) = true;
  49
  50   using std::locale;
  51   using std::has_facet;
  52   using std::use_facet;
  53
  54   locale loc_c = locale::classic();
  55   locale loc_base(loc_c, new base_facet);
  56   locale loc_derived(loc_c, new derived_facet);
  57
  58   // Standard facets.
  59   VERIFY( has_facet<std::ctype<char> >(loc_c) );
  60   VERIFY( has_facet<std::ctype<char> >(loc_base) );
  61   VERIFY( has_facet<std::ctype<char> >(loc_derived) );
  62
  63   // User defined base facet.
  64   VERIFY( !has_facet<base_facet>(loc_c) );
  65   VERIFY( has_facet<base_facet>(loc_base) );
  66   VERIFY( has_facet<base_facet>(loc_derived) );
  67
  68   // User defined derived facet.
  69   VERIFY( !has_facet<derived_facet>(loc_c) );
  70   VERIFY( !has_facet<derived_facet>(loc_base) );
  71   VERIFY( has_facet<derived_facet>(loc_derived) );
  72
  73
  74   // 1
  75   try
  76     {
  77       if (has_facet<derived_facet>(loc_base))
  78         {
  79           use_facet<derived_facet>(loc_base).msg_repeater();
  80           VERIFY( false );
  81         }
  82     }
  83   catch (...)
  84     {
  85       // Expect no exception.
  86       VERIFY( true );
  87     }
  88
  89   // 2
  90   try
  91     {
  92       if (has_facet<base_facet>(loc_derived))
  93         use_facet<base_facet>(loc_derived).msg();
  94       else
  95         VERIFY( true );
  96     }
  97   catch (...)
  98     {
  99       // Expect no exception.
 100       VERIFY( true );
 101     }
 102
 103   return 0;
 104 }