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

   1 // { dg-require-namedlocale "de_DE.ISO8859-15" }
   2 // { dg-require-namedlocale "es_ES.ISO8859-15" }
   3
   4 // Copyright (C) 2004-2020 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   locale l1 = locale(ISO_8859(15,de_DE));
  30   locale l2 = locale(ISO_8859(15,es_ES));
  31
  32   const time_put<char> &tp = use_facet<time_put<char> >(l1);
  33   ostringstream oss;
  34   oss.imbue(l2);
  35
  36   tm t = tm();
  37   tp.put(oss.rdbuf(), oss, ' ', &t, 'A');
  38   string res = oss.str();
  39
  40   VERIFY( res == "domingo" );
  41
  42   return 0;
  43 }
  44
  45 // Two interpretations of the standard.
  46
  47 // 1 : time_get, time_put each have their own data internally
  48 //   use internal data for time and date specifics
  49 //   use getloc for ctype info
  50
  51 // 2 : time_get, time_put use the ios_base& argument and getloc to
  52 // retrieve the necessary data.
  53 //   use getloc for ctype, time and date specifics
  54
  55 // It is my opinion that the language in the standard is sufficiently
  56 // vague to permit both interpretations. In particular, the interface
  57 // for time_get and time_put is based on strftime, which as
  58 // POSIX notes is dependent on LC_TIME. The C++ standard, however,
  59 // does not specify the equivalent mappings of LC_TIME to time_get and
  60 // time_put.
  61
  62 /*
  63 The problems with the first approach, as above, are numerous.
  64
  65 1) The locale usage and design for formatters and parsers becomes
  66    fragmented. On one side, num_put and money_put, and on the other,
  67    time_put. This inconsistency is not useful.
  68
  69 2) The data structures for time and date formatting are the largest in
  70    the locale library. Making time_put and time_get keep separate
  71    copies is inefficient. (Note that time_put and time_get are in the
  72    same locale::category).
  73 */
  74
  75
  76 /*
  77 22.2.5 - The time category [lib.category.time]
  78
  79 -1- Templates time_get<charT,InputIterator> and
  80  time_put<charT,OutputIterator> provide date and time formatting and
  81  parsing. All specifications of member functions for time_put and
  82  time_get in the subclauses of lib.category.time only apply to the
  83  instantiations required in Tables 51 and 52
  84  (lib.locale.category). Their members use their ios_base&,
  85  ios_base::iostate&, and fill arguments as described in
  86  (lib.locale.categories), and the ctype<> facet, to determine
  87  formatting details.
  88 */
  89
  90 /*
  91 22.2 - Standard locale categories [lib.locale.categories]
  92
  93 -1- Each of the standard categories includes a family of facets. Some
  94  of these implement formatting or parsing of a datum, for use by
  95  standard or users' iostream operators << and >>, as members put() and
  96  get(), respectively. Each such member function takes an ios_base&
  97  argument whose members flags(), precision(), and width(), specify the
  98  format of the corresponding datum. (lib.ios.base). Those functions
  99  which need to use other facets call its member getloc() to retrieve
 100  the locale imbued there. Formatting facets use the character argument
 101  fill to fill out the specified width where necessary.
 102 */
 103
 104 /*
 105 With GCC/libstdc++, the output of the program with the arguments
 106 of de_DE.ISO8859-15 es_ES is:
 107      domingo
 108      lunes
 109      martes
 110      miércoles
 111      jueves
 112      viernes
 113      sábado
 114
 115 With Intel C++, it is: (this is clearly wrong)
 116      Sunday
 117      Monday
 118      Tuesday
 119      Wednesday
 120      Thursday
 121      Friday
 122      Saturday
 123
 124 And with RogueWave C++
 125      Sonntag
 126      Montag
 127      Dienstag
 128      Mittwoch
 129      Donnerstag
 130      Freitag
 131      Samstag
 132 */