l4/pkg/libstdc++-v3/contrib/libstdc++-v3-4.4/doc/xml/manual/ctype.xml

   1 <sect1 id="manual.localization.facet.ctype" xreflabel="ctype">
   2 <?dbhtml filename="ctype.html"?>
   3
   4 <sect1info>
   5   <keywordset>
   6     <keyword>
   7       ISO C++
   8     </keyword>
   9     <keyword>
  10       ctype
  11     </keyword>
  12   </keywordset>
  13 </sect1info>
  14
  15 <title>ctype</title>
  16
  17 <sect2 id="facet.ctype.impl" xreflabel="facet.ctype.impl">
  18 <title>Implementation</title>
  19
  20   <sect3>
  21     <title>Specializations</title>
  22
  23 <para>
  24 For the required specialization codecvt&lt;wchar_t, char, mbstate_t&gt; ,
  25 conversions are made between the internal character set (always UCS4
  26 on GNU/Linux) and whatever the currently selected locale for the
  27 LC_CTYPE category implements.
  28 </para>
  29
  30 <para>
  31 The two required specializations are implemented as follows:
  32 </para>
  33
  34 <para>
  35 <code>
  36 ctype&lt;char&gt;
  37 </code>
  38 </para>
  39 <para>
  40 This is simple specialization. Implementing this was a piece of cake.
  41 </para>
  42
  43 <para>
  44 <code>
  45 ctype&lt;wchar_t&gt;
  46 </code>
  47 </para>
  48 <para>
  49 This specialization, by specifying all the template parameters, pretty
  50 much ties the hands of implementors. As such, the implementation is
  51 straightforward, involving mcsrtombs for the conversions between char
  52 to wchar_t and wcsrtombs for conversions between wchar_t and char.
  53 </para>
  54
  55 <para>
  56 Neither of these two required specializations deals with Unicode
  57 characters.
  58 </para>
  59
  60   </sect3>
  61 </sect2>
  62
  63 <sect2 id="facet.ctype.future" xreflabel="facet.ctype.future">
  64 <title>Future</title>
  65
  66
  67 <itemizedlist>
  68    <listitem>
  69    <para>
  70    How to deal with the global locale issue?
  71    </para></listitem>
  72
  73    <listitem>
  74    <para>
  75    How to deal with different types than char, wchar_t? </para></listitem>
  76
  77    <listitem><para>
  78    Overlap between codecvt/ctype: narrow/widen
  79    </para></listitem>
  80
  81    <listitem>
  82      <para>
  83        Mask typedef in codecvt_base, argument types in codecvt.  what
  84        is know about this type?
  85    </para></listitem>
  86
  87    <listitem>
  88    <para>
  89    Why mask* argument in codecvt?
  90    </para></listitem>
  91
  92    <listitem>
  93      <para>
  94        Can this be made (more) generic? is there a simple way to
  95        straighten out the configure-time mess that is a by-product of
  96        this class?
  97    </para></listitem>
  98
  99    <listitem>
 100      <para>
 101        Get the ctype&lt;wchar_t&gt;::mask stuff under control. Need to
 102        make some kind of static table, and not do lookup every time
 103        somebody hits the do_is... functions. Too bad we can't just
 104        redefine mask for ctype&lt;wchar_t&gt;
 105    </para></listitem>
 106
 107    <listitem>
 108      <para>
 109        Rename abstract base class. See if just smash-overriding is a
 110        better approach. Clarify, add sanity to naming.
 111      </para>
 112    </listitem>
 113
 114 </itemizedlist>
 115
 116
 117 </sect2>
 118
 119
 120 <bibliography id="facet.ctype.biblio" xreflabel="facet.ctype.biblio">
 121 <title>Bibliography</title>
 122
 123   <biblioentry>
 124     <title>
 125       The GNU C Library
 126     </title>
 127
 128     <author>
 129       <surname>McGrath</surname>
 130       <firstname>Roland</firstname>
 131     </author>
 132     <author>
 133       <surname>Drepper</surname>
 134       <firstname>Ulrich</firstname>
 135     </author>
 136
 137     <copyright>
 138       <year>2007</year>
 139       <holder>FSF</holder>
 140     </copyright>
 141     <pagenums>Chapters 6  Character Set Handling and 7 Locales and Internationalization</pagenums>
 142
 143   </biblioentry>
 144
 145   <biblioentry>
 146     <title>
 147       Correspondence
 148     </title>
 149
 150     <author>
 151       <surname>Drepper</surname>
 152       <firstname>Ulrich</firstname>
 153     </author>
 154
 155     <copyright>
 156       <year>2002</year>
 157       <holder></holder>
 158     </copyright>
 159   </biblioentry>
 160
 161   <biblioentry>
 162     <title>
 163       ISO/IEC 14882:1998 Programming languages - C++
 164     </title>
 165
 166     <copyright>
 167       <year>1998</year>
 168       <holder>ISO</holder>
 169     </copyright>
 170   </biblioentry>
 171
 172   <biblioentry>
 173     <title>
 174       ISO/IEC 9899:1999 Programming languages - C
 175     </title>
 176
 177     <copyright>
 178       <year>1999</year>
 179       <holder>ISO</holder>
 180     </copyright>
 181   </biblioentry>
 182
 183   <biblioentry>
 184     <title>
 185       System Interface Definitions, Issue 6 (IEEE Std. 1003.1-200x)
 186     </title>
 187
 188     <copyright>
 189       <year>1999</year>
 190       <holder>
 191       The Open Group/The Institute of Electrical and Electronics Engineers, Inc.</holder>
 192     </copyright>
 193
 194     <biblioid>
 195       <ulink url="http://www.opennc.org/austin/docreg.html">
 196       </ulink>
 197     </biblioid>
 198
 199   </biblioentry>
 200
 201   <biblioentry>
 202     <title>
 203       The C++ Programming Language, Special Edition
 204     </title>
 205
 206     <author>
 207       <surname>Stroustrup</surname>
 208       <firstname>Bjarne</firstname>
 209     </author>
 210
 211     <copyright>
 212       <year>2000</year>
 213       <holder>Addison Wesley, Inc.</holder>
 214     </copyright>
 215     <pagenums>Appendix D</pagenums>
 216
 217     <publisher>
 218       <publishername>
 219         Addison Wesley
 220       </publishername>
 221     </publisher>
 222
 223   </biblioentry>
 224
 225
 226   <biblioentry>
 227     <title>
 228       Standard C++ IOStreams and Locales
 229     </title>
 230     <subtitle>
 231       Advanced Programmer's Guide and Reference
 232     </subtitle>
 233
 234     <author>
 235       <surname>Langer</surname>
 236       <firstname>Angelika</firstname>
 237     </author>
 238
 239     <author>
 240       <surname>Kreft</surname>
 241       <firstname>Klaus</firstname>
 242     </author>
 243
 244     <copyright>
 245       <year>2000</year>
 246       <holder>Addison Wesley Longman, Inc.</holder>
 247     </copyright>
 248
 249     <publisher>
 250       <publishername>
 251         Addison Wesley Longman
 252       </publishername>
 253     </publisher>
 254
 255   </biblioentry>
 256
 257 </bibliography>
 258
 259 </sect1>