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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="AUTHOR" content="pme@gcc.gnu.org (Phil Edwards)">
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<meta name="KEYWORDS" content="HOWTO, libstdc++, gcc, g++, libg++, STL">
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<meta name="DESCRIPTION" content="HOWTO for libstdc++ chapter 17.">
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<meta name="GENERATOR" content="vi and eight fingers">
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2001-09-18 01:24:40 +02:00
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<title>libstdc++-v3 HOWTO: Chapter 17</title>
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<link rel="StyleSheet" href="../lib3styles.css">
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</head>
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<body>
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2001-10-09 22:18:14 +02:00
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<h1 class="centered"><a name="top">Chapter 17: Library Introduction</a></h1>
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<p>Chapter 17 is actually a list of definitions and descriptions used
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in the following chapters of the Standard when describing the actual
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library. Here, we use "Introduction" as an introduction
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to the <em>GNU implementation of</em> the ISO Standard C++ Library.
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</p>
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<!-- ####################################################### -->
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<hr>
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<h1>Contents</h1>
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<ul>
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<li><a href="#2">The Standard C++ header files</a>
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<li><a href="#3">The Standard C++ library and multithreading</a>
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<li><a href="#4"><code><foo></code> vs <code><foo.h></code></a>
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<li><a href="porting-howto.html">Porting HOWTO</a>
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<li><a href="#5">Behavior specific to libstdc++-v3</a>
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</ul>
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<hr>
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<!-- ####################################################### -->
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<h2><a name="2">The Standard C++ header files</a></h2>
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<p>The Standard C++ Library specifies 50 header files that must be
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available to all hosted implementations. Actually, the word
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"files" is a misnomer, since the contents of the headers
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don't necessarily have to be in any kind of external file. The
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only rule is that when you <code>#include</code> a certain header, the
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contents of that header, as defined by the Standard, become
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available to you, no matter how.
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</p>
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<p>The names of the headers can be easily seen in
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<a href="headers_cc.txt"><code>testsuite/17_intro/headers.cc</code></a>,
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which is a small testbed we use to make certain that the headers
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all compile and run.
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</p>
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<hr>
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<h2><a name="3">The Standard C++ library and multithreading</a></h2>
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<p>This section discusses issues surrounding the proper compilation
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of multithreaded applications which use the Standard C++
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library. This information is gcc-specific since the C++
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standard does not address matters of multithreaded applications.
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Unless explicitly prefaced, all information in this section is
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current as of the gcc 3.0 release and all later point releases.
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</p>
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<p>Earlier gcc releases had a somewhat different approach to
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threading configuration and proper compilation. Before gcc 3.0,
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configuration of the threading model was dictated by compiler
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command-line options and macros (both of which were somewhat
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thread-implementation and port-specific). There were no
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guarantees related to being able to link code compiled with one
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set of options and macro setting with another set. For gcc 3.0,
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configuration of the threading model used with libraries and
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user-code is performed when gcc is configured and built using
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the --enable-threads and --disable-threads options. The ABI is
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stable for symbol name-mangling and limited functional
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compatibility exists between code compiled under different
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threading models.
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</p>
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<p>All normal disclaimers aside, multithreaded C++ application are
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only supported when libstdc++ and all user code was built with
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compilers which report (via <code> gcc/g++ -v </code>) the same thread
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model and that model is not <em>single</em>. As long as your
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final application is actually single-threaded, then it should be
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safe to mix user code built with a thread model of
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<em>single</em> with a libstdc++ and other C++ libraries built
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with another thread model useful on the platform. Other mixes
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may or may not work but are not considered supported. (Thus, if
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you distribute a shared C++ library in binary form only, it may
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be best to compile it with a gcc configured with
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--enable-threads for maximal interchangeability and usefulness
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with a user population that may have built gcc with either
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--enable-threads or --disable-threads.)
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2001-09-18 01:24:40 +02:00
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</p>
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2001-11-16 21:59:10 +01:00
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<p>When you link a multithreaded application, you will probably
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need to add a library or flag to g++. This is a very
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non-standardized area of GCC across ports. Some ports support a
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special flag (the spelling isn't even standardized yet) to add
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all required macros to a compilation (if any such flags are
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required then you must provide the flag for all compilations not
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just linking) and link-library additions and/or replacements at
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link time. The documentation is weak. Here is a quick summary
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to display how ad hoc this is: On Solaris, both -pthreads and
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-threads (with subtly different meanings) are honored. On OSF,
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-pthread and -threads (with subtly different meanings) are
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honored. On Linux/i386, -pthread is honored. On FreeBSD,
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-pthread is honored. Some other ports use other switches.
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AFAIK, none of this is properly documented anywhere other than
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in ``gcc -dumpspecs'' (look at lib and cpp entries).
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2001-09-18 01:24:40 +02:00
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</p>
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2001-11-16 21:59:10 +01:00
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<p>See <a href="../faq/index.html#3">FAQ</a> (general overview), <a
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href="../23_containers/howto.html#3">23</a> (containers), and <a
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href="../27_io/howto.html#9">27</a> (I/O) for more information.
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</p>
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<p>The libstdc++-v3 library (unlike libstdc++-v2, all of it, not
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just the STL) has been designed so that multithreaded
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applications using it may be written. The first problem is
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finding a <em>fast</em> method of implementation portable to all
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platforms. Due to historical reasons, some of the library is
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written against per-CPU-architecture spinlocks and other parts
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against the gthr.h abstraction layer which is provided by gcc.
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A minor problem that pops up every so often is different
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interpretations of what "thread-safe" means for a
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library (not a general program). We currently use the <a
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href="http://www.sgi.com/tech/stl/thread_safety.html">same
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definition that SGI</a> uses for their STL subset. However, the
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exception for read-only containers only applies to the STL
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components.
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2001-09-18 01:24:40 +02:00
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</p>
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<p>Here is a small link farm to threads (no pun) in the mail archives
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2000-04-21 22:33:34 +02:00
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that discuss the threading problem. Each link is to the first
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ChangeLog, [...]: Fix spelling errors.
* ChangeLog, docs/doxygen/maint.cfg.in, docs/doxygen/user.cfg.in,
docs/doxygen/doxygroups.cc, docs/doxygen/Intro.3,
docs/html/17_intro/BUGS, docs/html/17_intro/C++STYLE,
docs/html/17_intro/CHECKLIST, docs/html/17_intro/DESIGN,
docs/html/17_intro/howto.html, docs/html/17_intro/porting.html,
docs/html/17_intro/porting.texi, docs/html/18_support/howto.html,
docs/html/19_diagnostics/howto.html, docs/html/20_util/howto.html,
docs/html/21_strings/howto.html,
docs/html/23_containers/howto.html,
docs/html/26_numerics/howto.html, docs/html/27_io/howto.html,
docs/html/27_io/binary_iostreams_kuehl.txt,
docs/html/ext/sgiexts.html, docs/html/faq/index.html,
docs/html/faq/index.txt, testsuite/24_iterators/iterator.cc,
include/bits/basic_file.h, include/bits/locale_facets.h,
include/bits/locale_facets.tcc, include/bits/std_sstream.h,
include/ext/ropeimpl.h, include/ext/stl_rope.h,
libsupc++/tinfo.cc, libsupc++/cxxabi.h, libsupc++/typeinfo,
libsupc++/eh_throw.cc, acinclude.m4, aclocal.m4, configure,
configure.target, ChangeLog-2000: Fix spelling errors.
From-SVN: r47291
2001-11-23 17:29:02 +01:00
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relevant message in the thread; from there you can use
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"Thread Next" to move down the thread. This farm is in
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latest-to-oldest order.
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<ul>
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2001-10-17 20:14:58 +02:00
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<li>Our threading expert Loren gives a breakdown of
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<a href="http://gcc.gnu.org/ml/libstdc++/2001-10/msg00024.html">the
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six situations involving threads</a> for the 3.0 release series.
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2001-09-18 01:24:40 +02:00
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<li><a href="http://gcc.gnu.org/ml/libstdc++/2001-05/msg00384.html">
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2001-10-17 20:14:58 +02:00
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This message</a> inspired a recent updating of issues with threading
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2001-09-15 02:41:11 +02:00
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and the SGI STL library. It also contains some example
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2001-10-17 20:14:58 +02:00
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POSIX-multithreaded STL code.
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2001-09-18 01:24:40 +02:00
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</ul>
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2001-10-17 20:14:58 +02:00
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(A large selection of links to older messages has been removed; many
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of the messages from 1999 were lost in a disk crash, and the few
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people with access to the backup tapes have been too swamped with work
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ChangeLog, [...]: Fix spelling errors.
* ChangeLog, docs/doxygen/maint.cfg.in, docs/doxygen/user.cfg.in,
docs/doxygen/doxygroups.cc, docs/doxygen/Intro.3,
docs/html/17_intro/BUGS, docs/html/17_intro/C++STYLE,
docs/html/17_intro/CHECKLIST, docs/html/17_intro/DESIGN,
docs/html/17_intro/howto.html, docs/html/17_intro/porting.html,
docs/html/17_intro/porting.texi, docs/html/18_support/howto.html,
docs/html/19_diagnostics/howto.html, docs/html/20_util/howto.html,
docs/html/21_strings/howto.html,
docs/html/23_containers/howto.html,
docs/html/26_numerics/howto.html, docs/html/27_io/howto.html,
docs/html/27_io/binary_iostreams_kuehl.txt,
docs/html/ext/sgiexts.html, docs/html/faq/index.html,
docs/html/faq/index.txt, testsuite/24_iterators/iterator.cc,
include/bits/basic_file.h, include/bits/locale_facets.h,
include/bits/locale_facets.tcc, include/bits/std_sstream.h,
include/ext/ropeimpl.h, include/ext/stl_rope.h,
libsupc++/tinfo.cc, libsupc++/cxxabi.h, libsupc++/typeinfo,
libsupc++/eh_throw.cc, acinclude.m4, aclocal.m4, configure,
configure.target, ChangeLog-2000: Fix spelling errors.
From-SVN: r47291
2001-11-23 17:29:02 +01:00
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to restore them. Many of the points have been superseded anyhow.)
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</p>
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<p>This section will be updated as new and interesting issues come
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to light.
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</p>
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<p>Return <a href="#top">to top of page</a> or
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<a href="../faq/index.html">to the FAQ</a>.
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</p>
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<hr>
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<h2><a name="4"><code><foo></code> vs <code><foo.h></code></a></h2>
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<p>The new-style headers are fully supported in libstdc++-v3. The compiler
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itself fully supports namespaces, including <code>std::</code>.
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</p>
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<p>For those of you new to ISO C++98, no, that isn't a typo, the headers
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really have new names. Marshall Cline's C++ FAQ Lite has a good
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explanation in
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<a href="http://www.cerfnet.com/~mpcline/On-Line-C++-FAQ/coding-standards.html#[25.4]">item [25.4]</a>.
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</p>
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<p>Return <a href="#top">to top of page</a> or
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<a href="../faq/index.html">to the FAQ</a>.
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</p>
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2000-04-21 22:33:34 +02:00
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2002-02-02 01:18:24 +01:00
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<hr>
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<h2><a name="5">Behavior specific to libstdc++-v3</a></h2>
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2002-02-05 01:14:37 +01:00
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<p>The ISO standard defines the following phrase:
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<blockquote><dl>
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<dt><code>[1.3.5] implementation-defined behavior</code>
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<dd>behavior, for a well-formed program construct and correct data, that
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depends on the implementation <strong>and that each implementation
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shall document</strong>.
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</dl></blockquote>
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We do so here, for the C++ library only. Behavior of the compiler,
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linker, runtime loader, and other elements of "the
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implementation" are documented elsewhere. Everything listed in
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Annex B, Implemenation Qualities, are also part of the compiler, not
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the library.
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2002-02-02 01:18:24 +01:00
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</p>
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<p>For each entry, we give the section number of the standard, when
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applicable. This list is probably incomplet and inkorrekt.
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2002-02-02 01:18:24 +01:00
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</p>
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<p><strong>[17.4.4.5]</strong> Non-reentrant functions are probably best
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discussed in the various sections on multithreading (see above).
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</p>
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<!-- [17.4.4.8]/3 says any function that doesn't have an exception-spec
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can throw whatever we want; see also its footnote. Let's list those
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in the sections where the function itself occurs.
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-->
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<p><strong>[18.1]/4</strong> The type of <code>NULL</code> is described
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<a href="../18_support/howto.html#1">here</a>.
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</p>
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<p><strong>[18.3]/8</strong> Even though it's listed in the library
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sections, libstdc++-v3 has zero control over what the cleanup code hands
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back to the runtime loader. Talk to the compiler people. :-)
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</p>
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<p><strong>[18.4.2.1]/5</strong> (bad_alloc),<br>
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<strong>[18.5.2]/5</strong> (bad_cast),<br>
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<strong>[18.5.3]/5</strong> (bad_typeid),<br>
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<strong>[18.6.1]/8</strong> (exception),<br>
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<strong>[18.6.2.1]/5</strong> (bad_exception): The <code>what()</code>
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member function of class <code>std::exception</code>, and these other
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classes publicly derived from it, simply returns the name of the
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class. But they are the <em>mangled</em> names; you will need to call
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<code>c++filt</code> and pass the names as command-line parameters to
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demangle them.
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(The classes in <code><stdexcept></code> have constructors which
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require an argument to use later for <code>what()</code> calls, so the
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question does not arise in most user-defined exceptions.)
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</p>
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2002-02-05 01:14:37 +01:00
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<p><strong>[18.5.1]/7</strong> The return value of
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<code>std::type_info::name()</code> is the mangled type name (see the
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previous entry for more).
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2002-02-02 01:18:24 +01:00
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</p>
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2002-02-05 01:14:37 +01:00
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<p><strong>[20.1.5]/5</strong> <em>"Implementors are encouraged to
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supply libraries that can accept allocators that encapsulate more
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general memory models and that support non-equal instances. In such
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implementations, any requirements imposed on allocators by containers
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beyond those requirements that appear in Table 32, and the semantics
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of containers and algorithms when allocator instances compare
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non-equal, are implementation-defined."</em> As yet we don't
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have any allocators which compare non-equal, so we can't describe how
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they behave.
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2002-02-02 01:18:24 +01:00
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</p>
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2002-02-05 01:14:37 +01:00
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<p><strong>[21.1.3.1]/3,4</strong>,<br>
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<strong>[21.1.3.2]/2</strong>,<br>
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<strong>[23.*]'s foo::iterator</strong>,<br>
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<strong>[27.*]'s foo::*_type</strong>,<br>
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<strong>others...</strong>
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Nope, these types are called implementation-defined because you
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shouldn't be taking advantage of their underlying types. Listing them
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here would defeat the purpose. :-)
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2002-02-02 01:18:24 +01:00
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</p>
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2002-02-05 01:14:37 +01:00
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<p><strong>[21.1.3.1]/5</strong> I don't really know about the mbstate_t
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stuff... see the chapter 22 notes for what does exist.
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2002-02-02 01:18:24 +01:00
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</p>
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2002-02-05 01:14:37 +01:00
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<p><strong>[22.*]</strong> Anything and everything we have on locale
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implemenation will be described
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<a href="../22_locale/howto.html">over here</a>.
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2002-02-02 01:18:24 +01:00
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</p>
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2002-02-05 01:14:37 +01:00
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<p><strong>[26.2.8]/9</strong> I have no idea what
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<code>complex<T></code>'s pow(0,0) returns.
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2002-02-02 01:18:24 +01:00
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</p>
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2002-02-05 01:14:37 +01:00
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<p><strong>[27.4.2.4]/2</strong> Calling
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<code>std::ios_base::sync_with_stdio</code> after I/O has already been
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performed on the standard stream objects will
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flush the buffers, and <!-- this line might go away -->
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destroy and recreate the underlying buffer instances. Whether or not
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the previously-written I/O is destroyed in this process depends mostly
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on the --enable-libio choice: for stdio, if the written data is
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already in the stdio buffer, the data may be completely safe!
|
2002-02-02 01:18:24 +01:00
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</p>
|
2002-02-05 01:14:37 +01:00
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<p><strong>I/O sentry ctor/dtor</strong> They can perform additional work
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than the minimum required. I don't think we're currently taking
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advantage of this yet.
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</p>
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<p><strong>[27.7.1.3]/16</strong>,<br>
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<strong>[27.8.1.4]/10</strong>
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The effects of <code>pubsetbuf/setbuf</code> are described
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<a href="../27_io/howto.html#2">in this chapter</a>.
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</p>
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<p><strong>[27.8.1.4]/16</strong> Calling <code>fstream::sync</code> when
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a get area exists will... whatever <code>fflush()</code> does, I think.
|
2002-02-02 01:18:24 +01:00
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</p>
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<p>Return <a href="#top">to top of page</a> or
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<a href="../faq/index.html">to the FAQ</a>.
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</p>
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2000-04-21 22:33:34 +02:00
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<!-- ####################################################### -->
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2001-09-18 01:24:40 +02:00
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<hr>
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2001-10-09 22:18:14 +02:00
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<p class="fineprint"><em>
|
2001-10-04 22:03:22 +02:00
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See <a href="license.html">license.html</a> for copying conditions.
|
2000-04-21 22:33:34 +02:00
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Comments and suggestions are welcome, and may be sent to
|
2001-10-09 22:18:14 +02:00
|
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<a href="mailto:libstdc++@gcc.gnu.org">the libstdc++ mailing list</a>.
|
2001-09-18 01:24:40 +02:00
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</em></p>
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2000-04-21 22:33:34 +02:00
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2001-09-18 01:24:40 +02:00
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</body>
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</html>
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2000-04-21 22:33:34 +02:00
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