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223 lines
5.3 KiB
XML
223 lines
5.3 KiB
XML
<section xmlns="http://docbook.org/ns/docbook" version="5.0"
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xml:id="std.localization.facet.ctype" xreflabel="ctype">
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<?dbhtml filename="ctype.html"?>
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<info><title>ctype</title>
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<keywordset>
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<keyword>
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ISO C++
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</keyword>
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<keyword>
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ctype
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</keyword>
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</keywordset>
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</info>
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<section xml:id="facet.ctype.impl"><info><title>Implementation</title></info>
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<section><info><title>Specializations</title></info>
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<para>
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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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</para>
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<para>
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The two required specializations are implemented as follows:
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</para>
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<para>
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<code>
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ctype<char>
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</code>
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</para>
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<para>
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This is simple specialization. Implementing this was a piece of cake.
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</para>
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<para>
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<code>
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ctype<wchar_t>
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</code>
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</para>
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<para>
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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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</para>
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<para>
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Neither of these two required specializations deals with Unicode
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characters.
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</para>
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</section>
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</section>
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<section xml:id="facet.ctype.future"><info><title>Future</title></info>
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<itemizedlist>
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<listitem>
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<para>
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How to deal with the global locale issue?
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</para></listitem>
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<listitem>
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<para>
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How to deal with different types than char, wchar_t? </para></listitem>
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<listitem><para>
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Overlap between codecvt/ctype: narrow/widen
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</para></listitem>
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<listitem>
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<para>
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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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</para></listitem>
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<listitem>
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<para>
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Why mask* argument in codecvt?
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</para></listitem>
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<listitem>
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<para>
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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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</para></listitem>
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<listitem>
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<para>
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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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</para></listitem>
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<listitem>
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<para>
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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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</para>
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</listitem>
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</itemizedlist>
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</section>
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<bibliography xml:id="facet.ctype.biblio"><info><title>Bibliography</title></info>
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<biblioentry>
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<citetitle>
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The GNU C Library
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</citetitle>
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<author><personname><surname>McGrath</surname><firstname>Roland</firstname></personname></author>
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<author><personname><surname>Drepper</surname><firstname>Ulrich</firstname></personname></author>
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<copyright>
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<year>2007</year>
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<holder>FSF</holder>
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</copyright>
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<pagenums>Chapters 6 Character Set Handling and 7 Locales and Internationalization</pagenums>
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</biblioentry>
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<biblioentry>
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<citetitle>
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Correspondence
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</citetitle>
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<author><personname><surname>Drepper</surname><firstname>Ulrich</firstname></personname></author>
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<copyright>
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<year>2002</year>
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<holder/>
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</copyright>
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</biblioentry>
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<biblioentry>
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<citetitle>
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ISO/IEC 14882:1998 Programming languages - C++
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</citetitle>
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<copyright>
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<year>1998</year>
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<holder>ISO</holder>
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</copyright>
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</biblioentry>
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<biblioentry>
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<citetitle>
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ISO/IEC 9899:1999 Programming languages - C
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</citetitle>
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<copyright>
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<year>1999</year>
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<holder>ISO</holder>
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</copyright>
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</biblioentry>
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<biblioentry>
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<title>
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<link xmlns:xlink="http://www.w3.org/1999/xlink"
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xlink:href="http://www.unix.org/version3/ieee_std.html">
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The Open Group Base Specifications, Issue 6 (IEEE Std. 1003.1-2004)
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</link>
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</title>
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<copyright>
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<year>1999</year>
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<holder>
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The Open Group/The Institute of Electrical and Electronics Engineers, Inc.</holder>
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</copyright>
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</biblioentry>
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<biblioentry>
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<citetitle>
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The C++ Programming Language, Special Edition
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</citetitle>
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<author><personname><surname>Stroustrup</surname><firstname>Bjarne</firstname></personname></author>
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<copyright>
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<year>2000</year>
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<holder>Addison Wesley, Inc.</holder>
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</copyright>
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<pagenums>Appendix D</pagenums>
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<publisher>
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<publishername>
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Addison Wesley
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</publishername>
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</publisher>
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</biblioentry>
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<biblioentry>
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<citetitle>
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Standard C++ IOStreams and Locales
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</citetitle>
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<subtitle>
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Advanced Programmer's Guide and Reference
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</subtitle>
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<author><personname><surname>Langer</surname><firstname>Angelika</firstname></personname></author>
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<author><personname><surname>Kreft</surname><firstname>Klaus</firstname></personname></author>
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<copyright>
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<year>2000</year>
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<holder>Addison Wesley Longman, Inc.</holder>
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</copyright>
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<publisher>
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<publishername>
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Addison Wesley Longman
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</publishername>
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</publisher>
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</biblioentry>
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</bibliography>
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</section>
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