libstdc++-v3/testsuite/22_locale/time_put/put/char/9780-1.cc

   1 // { dg-require-namedlocale "de_DE" }
   2 // { dg-require-namedlocale "es_ES" }
   3
   4 // Copyright (C) 2004, 2005, 2009 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <sstream>
  22 #include <locale>
  23 #include <testsuite_hooks.h>
  24
  25 int main()
  26 {
  27   using namespace std;
  28
  29   bool test __attribute__((unused)) = true;
  30   locale l1 = locale("de_DE");
  31   locale l2 = locale("es_ES");
  32
  33   const time_put<char> &tp = use_facet<time_put<char> >(l1);
  34   ostringstream oss;
  35   oss.imbue(l2);
  36
  37   tm t = tm();
  38   tp.put(oss.rdbuf(), oss, ' ', &t, 'A');
  39   string res = oss.str();
  40
  41   VERIFY( res == "domingo" );
  42
  43   return 0;
  44 }
  45
  46 // Two interpretations of the standard.
  47
  48 // 1 : time_get, time_put each have their own data internally
  49 //   use internal data for time and date specifics
  50 //   use getloc for ctype info
  51
  52 // 2 : time_get, time_put use the ios_base& argument and getloc to
  53 // retrieve the necessary data.
  54 //   use getloc for ctype, time and date specifics
  55
  56 // It is my opinion that the language in the standard is sufficiently
  57 // vague to permit both interpretations. In particular, the interface
  58 // for time_get and time_put is based on strftime, which as
  59 // POSIX notes is dependent on LC_TIME. The C++ standard, however,
  60 // does not specify the equivalent mappings of LC_TIME to time_get and
  61 // time_put.
  62
  63 /*
  64 The problems with the first approach, as above, are numerous.
  65
  66 1) The locale usage and design for formatters and parsers becomes
  67    fragmented. On one side, num_put and money_put, and on the other,
  68    time_put. This inconsistency is not useful.
  69
  70 2) The data structures for time and date formatting are the largest in
  71    the locale library. Making time_put and time_get keep separate
  72    copies is inefficient. (Note that time_put and time_get are in the
  73    same locale::category).
  74 */
  75
  76
  77 /*
  78 22.2.5 - The time category [lib.category.time]
  79
  80 -1- Templates time_get<charT,InputIterator> and
  81  time_put<charT,OutputIterator> provide date and time formatting and
  82  parsing. All specifications of member functions for time_put and
  83  time_get in the subclauses of lib.category.time only apply to the
  84  instantiations required in Tables 51 and 52
  85  (lib.locale.category). Their members use their ios_base&,
  86  ios_base::iostate&, and fill arguments as described in
  87  (lib.locale.categories), and the ctype<> facet, to determine
  88  formatting details.
  89 */
  90
  91 /*
  92 22.2 - Standard locale categories [lib.locale.categories]
  93
  94 -1- Each of the standard categories includes a family of facets. Some
  95  of these implement formatting or parsing of a datum, for use by
  96  standard or users' iostream operators << and >>, as members put() and
  97  get(), respectively. Each such member function takes an ios_base&
  98  argument whose members flags(), precision(), and width(), specify the
  99  format of the corresponding datum. (lib.ios.base). Those functions
 100  which need to use other facets call its member getloc() to retrieve
 101  the locale imbued there. Formatting facets use the character argument
 102  fill to fill out the specified width where necessary.
 103 */
 104
 105 /*
 106 With GCC/libstdc++, the output of the program with the arguments
 107 of de_DE es_ES is:
 108      domingo
 109      lunes
 110      martes
 111      miércoles
 112      jueves
 113      viernes
 114      sábado
 115
 116 With Intel C++, it is: (this is clearly wrong)
 117      Sunday
 118      Monday
 119      Tuesday
 120      Wednesday
 121      Thursday
 122      Friday
 123      Saturday
 124
 125 And with RogueWave C++
 126      Sonntag
 127      Montag
 128      Dienstag
 129      Mittwoch
 130      Donnerstag
 131      Freitag
 132      Samstag
 133 */