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- <meta name="AUTHOR" content="bkoz@redhat.com (Benjamin Kosnik)" />
- <meta name="KEYWORDS" content="HOWTO, libstdc++, GCC, g++, libg++, STL" />
- <meta name="DESCRIPTION" content="Notes on the ctype implementation." />
- <title>Notes on the ctype implementation.</title>
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- <h1>
- Notes on the ctype implementation.
- </h1>
-<em>
-prepared by Benjamin Kosnik (bkoz@redhat.com) on August 30, 2000
-</em>
-
-<h2>
-1. Abstract
-</h2>
-<p>
-Woe is me.
-</p>
-
-<h2>
-2. What the standard says
-</h2>
-
-
-<h2>
-3. Problems with "C" ctype : global locales, termination.
-</h2>
-
-<p>
-For the required specialization codecvt<wchar_t, char, mbstate_t> ,
-conversions are made between the internal character set (always UCS4
-on GNU/Linux) and whatever the currently selected locale for the
-LC_CTYPE category implements.
-</p>
-
-<h2>
-4. Design
-</h2>
-The two required specializations are implemented as follows:
-
-<p>
-<code>
-ctype<char>
-</code>
-</p>
-<p>
-This is simple specialization. Implementing this was a piece of cake.
-</p>
-
-<p>
-<code>
-ctype<wchar_t>
-</code>
-</p>
-<p>
-This specialization, by specifying all the template parameters, pretty
-much ties the hands of implementors. As such, the implementation is
-straightforward, involving mcsrtombs for the conversions between char
-to wchar_t and wcsrtombs for conversions between wchar_t and char.
-</p>
-
-<p>
-Neither of these two required specializations deals with Unicode
-characters. As such, libstdc++-v3 implements
-</p>
-
-<h2>
-5. Examples
-</h2>
-
-<pre>
- typedef ctype<char> cctype;
-</pre>
-
-More information can be found in the following testcases:
-<ul>
-<li> testsuite/22_locale/ctype_char_members.cc </li>
-<li> testsuite/22_locale/ctype_wchar_t_members.cc </li>
-</ul>
-
-<h2>
-6. Unresolved Issues
-</h2>
-
-<ul>
- <li> how to deal with the global locale issue? </li>
-
- <li> how to deal with different types than char, wchar_t? </li>
-
- <li> codecvt/ctype overlap: narrow/widen </li>
-
- <li> mask typedef in codecvt_base, argument types in codecvt.
- what is know about this type? </li>
-
- <li> why mask* argument in codecvt? </li>
-
- <li> can this be made (more) generic? is there a simple way to
- straighten out the configure-time mess that is a by-product of
- this class? </li>
-
- <li> get the ctype<wchar_t>::mask stuff under control. Need to
- make some kind of static table, and not do lookup evertime
- somebody hits the do_is... functions. Too bad we can't just
- redefine mask for ctype<wchar_t> </li>
-
- <li> rename abstract base class. See if just smash-overriding
- is a better approach. Clarify, add sanity to naming. </li>
-
-</ul>
-
-
-<h2>
-7. Acknowledgments
-</h2>
-Ulrich Drepper for patient answering of late-night questions, skeletal
-examples, and C language expertise.
-
-<h2>
-8. Bibliography / Referenced Documents
-</h2>
-
-Drepper, Ulrich, GNU libc (glibc) 2.2 manual. In particular, Chapters "6. Character Set Handling" and "7 Locales and Internationalization"
-
-<p>
-Drepper, Ulrich, Numerous, late-night email correspondence
-</p>
-
-<p>
-ISO/IEC 14882:1998 Programming languages - C++
-</p>
-
-<p>
-ISO/IEC 9899:1999 Programming languages - C
-</p>
-
-<p>
-Langer, Angelika and Klaus Kreft, Standard C++ IOStreams and Locales, Advanced Programmer's Guide and Reference, Addison Wesley Longman, Inc. 2000
-</p>
-
-<p>
-Stroustrup, Bjarne, Appendix D, The C++ Programming Language, Special Edition, Addison Wesley, Inc. 2000
-</p>
-
-<p>
-System Interface Definitions, Issue 6 (IEEE Std. 1003.1-200x)
-The Open Group/The Institute of Electrical and Electronics Engineers, Inc.
-http://www.opennc.org/austin/docreg.html
-</p>
-
-</body>
-</html>
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