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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 15. Facets aka Categories</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><meta name="keywords" content=" ISO C++ , library " /><link rel="home" href="../spine.html" title="The GNU C++ Library Documentation" /><link rel="up" href="localization.html" title="Part VI. Localization" /><link rel="prev" href="locales.html" title="Chapter 14. Locales" /><link rel="next" href="codecvt.html" title="codecvt" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 15. Facets aka Categories</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="locales.html">Prev</a> </td><th width="60%" align="center">Part VI.
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Localization
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</th><td width="20%" align="right"> <a accesskey="n" href="codecvt.html">Next</a></td></tr></table><hr /></div><div class="chapter" title="Chapter 15. Facets aka Categories"><div class="titlepage"><div><div><h2 class="title"><a id="manual.localization.facet"></a>Chapter 15. Facets aka Categories</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="facets.html#manual.localization.facet.ctype">ctype</a></span></dt><dd><dl><dt><span class="sect2"><a href="facets.html#facet.ctype.impl">Implementation</a></span></dt><dt><span class="sect2"><a href="facets.html#facet.ctype.future">Future</a></span></dt></dl></dd><dt><span class="sect1"><a href="codecvt.html">codecvt</a></span></dt><dd><dl><dt><span class="sect2"><a href="codecvt.html#facet.codecvt.req">Requirements</a></span></dt><dt><span class="sect2"><a href="codecvt.html#facet.codecvt.design">Design</a></span></dt><dt><span class="sect2"><a href="codecvt.html#facet.codecvt.impl">Implementation</a></span></dt><dt><span class="sect2"><a href="codecvt.html#facet.codecvt.use">Use</a></span></dt><dt><span class="sect2"><a href="codecvt.html#facet.codecvt.future">Future</a></span></dt></dl></dd><dt><span class="sect1"><a href="messages.html">messages</a></span></dt><dd><dl><dt><span class="sect2"><a href="messages.html#facet.messages.req">Requirements</a></span></dt><dt><span class="sect2"><a href="messages.html#facet.messages.design">Design</a></span></dt><dt><span class="sect2"><a href="messages.html#facet.messages.impl">Implementation</a></span></dt><dt><span class="sect2"><a href="messages.html#facet.messages.use">Use</a></span></dt><dt><span class="sect2"><a href="messages.html#facet.messages.future">Future</a></span></dt></dl></dd></dl></div><div class="sect1" title="ctype"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.localization.facet.ctype"></a>ctype</h2></div></div></div><div class="sect2" title="Implementation"><div class="titlepage"><div><div><h3 class="title"><a id="facet.ctype.impl"></a>Implementation</h3></div></div></div><div class="sect3" title="Specializations"><div class="titlepage"><div><div><h4 class="title"><a id="id602134"></a>Specializations</h4></div></div></div><p>
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For the required specialization codecvt<wchar_t, char, mbstate_t> ,
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conversions are made between the internal character set (always UCS4
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on GNU/Linux) and whatever the currently selected locale for the
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LC_CTYPE category implements.
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</p><p>
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The two required specializations are implemented as follows:
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</p><p>
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<code class="code">
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ctype<char>
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</code>
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</p><p>
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This is simple specialization. Implementing this was a piece of cake.
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</p><p>
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<code class="code">
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ctype<wchar_t>
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</code>
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</p><p>
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This specialization, by specifying all the template parameters, pretty
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much ties the hands of implementors. As such, the implementation is
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straightforward, involving mcsrtombs for the conversions between char
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to wchar_t and wcsrtombs for conversions between wchar_t and char.
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</p><p>
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Neither of these two required specializations deals with Unicode
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characters.
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</p></div></div><div class="sect2" title="Future"><div class="titlepage"><div><div><h3 class="title"><a id="facet.ctype.future"></a>Future</h3></div></div></div><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>
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How to deal with the global locale issue?
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</p></li><li class="listitem"><p>
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How to deal with different types than char, wchar_t? </p></li><li class="listitem"><p>
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Overlap between codecvt/ctype: narrow/widen
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</p></li><li class="listitem"><p>
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Mask typedef in codecvt_base, argument types in codecvt. what
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is know about this type?
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</p></li><li class="listitem"><p>
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Why mask* argument in codecvt?
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</p></li><li class="listitem"><p>
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Can this be made (more) generic? is there a simple way to
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straighten out the configure-time mess that is a by-product of
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this class?
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</p></li><li class="listitem"><p>
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Get the ctype<wchar_t>::mask stuff under control. Need to
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make some kind of static table, and not do lookup every time
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somebody hits the do_is... functions. Too bad we can't just
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redefine mask for ctype<wchar_t>
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</p></li><li class="listitem"><p>
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Rename abstract base class. See if just smash-overriding is a
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better approach. Clarify, add sanity to naming.
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</p></li></ul></div></div><div class="bibliography" title="Bibliography"><div class="titlepage"><div><div><h3 class="title"><a id="facet.ctype.biblio"></a>Bibliography</h3></div></div></div><div class="biblioentry" title="The GNU C Library"><a id="id721212"></a><p><span class="title"><i>
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The GNU C Library
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</i>. </span><span class="author"><span class="firstname">Roland</span> <span class="surname">McGrath</span>. </span><span class="author"><span class="firstname">Ulrich</span> <span class="surname">Drepper</span>. </span><span class="copyright">Copyright © 2007 FSF. </span><span class="pagenums">Chapters 6 Character Set Handling and 7 Locales and Internationalization. </span></p></div><div class="biblioentry" title="Correspondence"><a id="id611041"></a><p><span class="title"><i>
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Correspondence
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</i>. </span><span class="author"><span class="firstname">Ulrich</span> <span class="surname">Drepper</span>. </span><span class="copyright">Copyright © 2002 . </span></p></div><div class="biblioentry" title="ISO/IEC 14882:1998 Programming languages - C++"><a id="id612309"></a><p><span class="title"><i>
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ISO/IEC 14882:1998 Programming languages - C++
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</i>. </span><span class="copyright">Copyright © 1998 ISO. </span></p></div><div class="biblioentry" title="ISO/IEC 9899:1999 Programming languages - C"><a id="id612328"></a><p><span class="title"><i>
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ISO/IEC 9899:1999 Programming languages - C
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</i>. </span><span class="copyright">Copyright © 1999 ISO. </span></p></div><div class="biblioentry" title="The Open Group Base Specifications, Issue 6 (IEEE Std. 1003.1-2004)"><a id="id626861"></a><p><span class="title"><i>
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The Open Group Base Specifications, Issue 6 (IEEE Std. 1003.1-2004)
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</i>. </span><span class="copyright">Copyright © 1999
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The Open Group/The Institute of Electrical and Electronics Engineers, Inc.. </span><span class="biblioid">
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<a class="ulink" href="http://www.unix.org/version3/ieee_std.html" target="_top">
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</a>
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. </span></p></div><div class="biblioentry" title="The C++ Programming Language, Special Edition"><a id="id626888"></a><p><span class="title"><i>
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The C++ Programming Language, Special Edition
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</i>. </span><span class="author"><span class="firstname">Bjarne</span> <span class="surname">Stroustrup</span>. </span><span class="copyright">Copyright © 2000 Addison Wesley, Inc.. </span><span class="pagenums">Appendix D. </span><span class="publisher"><span class="publishername">
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Addison Wesley
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. </span></span></p></div><div class="biblioentry" title="Standard C++ IOStreams and Locales"><a id="id655841"></a><p><span class="title"><i>
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Standard C++ IOStreams and Locales
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</i>. </span><span class="subtitle">
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Advanced Programmer's Guide and Reference
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. </span><span class="author"><span class="firstname">Angelika</span> <span class="surname">Langer</span>. </span><span class="author"><span class="firstname">Klaus</span> <span class="surname">Kreft</span>. </span><span class="copyright">Copyright © 2000 Addison Wesley Longman, Inc.. </span><span class="publisher"><span class="publishername">
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Addison Wesley Longman
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. </span></span></p></div></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="locales.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="localization.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="codecvt.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 14. Locales </td><td width="20%" align="center"><a accesskey="h" href="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> codecvt</td></tr></table></div></body></html>
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