diff options
Diffstat (limited to 'libstdc++-v3/doc/html/manual/backwards.html')
| -rw-r--r-- | libstdc++-v3/doc/html/manual/backwards.html | 61 |
1 files changed, 32 insertions, 29 deletions
diff --git a/libstdc++-v3/doc/html/manual/backwards.html b/libstdc++-v3/doc/html/manual/backwards.html index 2497438a1e9..fa7d92cd311 100644 --- a/libstdc++-v3/doc/html/manual/backwards.html +++ b/libstdc++-v3/doc/html/manual/backwards.html @@ -1,6 +1,6 @@ <?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> -<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Backwards Compatibility</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><meta name="keywords" content=" ISO C++ , backwards "/><meta name="keywords" content=" ISO C++ , library "/><link rel="home" href="../spine.html" title="The GNU C++ Library"/><link rel="up" href="appendix_porting.html" title="Appendix B. Porting and Maintenance"/><link rel="prev" href="api.html" title="API Evolution and Deprecation History"/><link rel="next" href="appendix_free.html" title="Appendix C. Free Software Needs Free Documentation"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Backwards Compatibility</th></tr><tr><td align="left"><a accesskey="p" href="api.html">Prev</a> </td><th width="60%" align="center">Appendix B. +<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Backwards Compatibility</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><meta name="keywords" content=" ISO C++ , backwards "/><meta name="keywords" content=" ISO C++ , library "/><meta name="keywords" content=" ISO C++ , runtime , library "/><link rel="home" href="../index.html" title="The GNU C++ Library"/><link rel="up" href="appendix_porting.html" title="Appendix B. Porting and Maintenance"/><link rel="prev" href="api.html" title="API Evolution and Deprecation History"/><link rel="next" href="appendix_free.html" title="Appendix C. Free Software Needs Free Documentation"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Backwards Compatibility</th></tr><tr><td align="left"><a accesskey="p" href="api.html">Prev</a> </td><th width="60%" align="center">Appendix B. Porting and Maintenance </th><td align="right"> <a accesskey="n" href="appendix_free.html">Next</a></td></tr></table><hr/></div><div class="section" title="Backwards Compatibility"><div class="titlepage"><div><div><h2 class="title"><a id="manual.appendix.porting.backwards"/>Backwards Compatibility</h2></div></div></div><div class="section" title="First"><div class="titlepage"><div><div><h3 class="title"><a id="backwards.first"/>First</h3></div></div></div><p>The first generation GNU C++ library was called libg++. It was a @@ -17,8 +17,8 @@ ISO Standard (e.g., statistical analysis). While there are a lot of really useful things that are used by a lot of people, the Standards Committee couldn't include everything, and so a lot of those <span class="quote">“<span class="quote">obvious</span>”</span> classes didn't get included. -</p><p>Known Issues include many of the limitations of its immediate ancestor.</p><p>Portability notes and known implementation limitations are as follows.</p><div class="section" title="No ios_base"><div class="titlepage"><div><div><h4 class="title"><a id="id494148"/>No <code class="code">ios_base</code></h4></div></div></div><p> At least some older implementations don't have <code class="code">std::ios_base</code>, so you should use <code class="code">std::ios::badbit</code>, <code class="code">std::ios::failbit</code> and <code class="code">std::ios::eofbit</code> and <code class="code">std::ios::goodbit</code>. -</p></div><div class="section" title="No cout in ostream.h, no cin in istream.h"><div class="titlepage"><div><div><h4 class="title"><a id="id494180"/>No <code class="code">cout</code> in <code class="code">ostream.h</code>, no <code class="code">cin</code> in <code class="code">istream.h</code></h4></div></div></div><p> +</p><p>Known Issues include many of the limitations of its immediate ancestor.</p><p>Portability notes and known implementation limitations are as follows.</p><div class="section" title="No ios_base"><div class="titlepage"><div><div><h4 class="title"><a id="id710570"/>No <code class="code">ios_base</code></h4></div></div></div><p> At least some older implementations don't have <code class="code">std::ios_base</code>, so you should use <code class="code">std::ios::badbit</code>, <code class="code">std::ios::failbit</code> and <code class="code">std::ios::eofbit</code> and <code class="code">std::ios::goodbit</code>. +</p></div><div class="section" title="No cout in ostream.h, no cin in istream.h"><div class="titlepage"><div><div><h4 class="title"><a id="id710603"/>No <code class="code">cout</code> in <code class="code">ostream.h</code>, no <code class="code">cin</code> in <code class="code">istream.h</code></h4></div></div></div><p> In earlier versions of the standard, <code class="filename">fstream.h</code>, <code class="filename">ostream.h</code> @@ -44,7 +44,7 @@ considered replaced and rewritten. archived. The code is considered replaced and rewritten. </p><p> Portability notes and known implementation limitations are as follows. -</p><div class="section" title="Namespace std:: not supported"><div class="titlepage"><div><div><h4 class="title"><a id="id494283"/>Namespace <code class="code">std::</code> not supported</h4></div></div></div><p> +</p><div class="section" title="Namespace std:: not supported"><div class="titlepage"><div><div><h4 class="title"><a id="id710706"/>Namespace <code class="code">std::</code> not supported</h4></div></div></div><p> Some care is required to support C++ compiler and or library implementation that do not have the standard library in <code class="code">namespace std</code>. @@ -108,7 +108,7 @@ AC_DEFUN([AC_CXX_NAMESPACE_STD], [ AC_DEFINE(HAVE_NAMESPACE_STD,,[Define if g++ supports namespace std. ]) fi ]) -</pre></div><div class="section" title="Illegal iterator usage"><div class="titlepage"><div><div><h4 class="title"><a id="id494409"/>Illegal iterator usage</h4></div></div></div><p> +</pre></div><div class="section" title="Illegal iterator usage"><div class="titlepage"><div><div><h4 class="title"><a id="id710832"/>Illegal iterator usage</h4></div></div></div><p> The following illustrate implementation-allowed illegal iterator use, and then correct use. </p><div class="itemizedlist"><ul class="itemizedlist"><li class="listitem"><p> @@ -121,7 +121,7 @@ AC_DEFUN([AC_CXX_NAMESPACE_STD], [ </p></li><li class="listitem"><p> <code class="code">if (iterator)</code> won't work any more => use <code class="code">if (iterator != iterator_type())</code> - </p></li></ul></div></div><div class="section" title="isspace from cctype is a macro"><div class="titlepage"><div><div><h4 class="title"><a id="id494471"/><code class="code">isspace</code> from <code class="filename">cctype</code> is a macro + </p></li></ul></div></div><div class="section" title="isspace from cctype is a macro"><div class="titlepage"><div><div><h4 class="title"><a id="id710893"/><code class="code">isspace</code> from <code class="filename">cctype</code> is a macro </h4></div></div></div><p> Glibc 2.0.x and 2.1.x define <code class="filename">ctype.h</code> functionality as macros (isspace, isalpha etc.). @@ -154,7 +154,7 @@ std:: (__ctype_b[(int) ( ( 'X' ) )] & (unsigned short int) _ISspace ) ; (<code class="filename">ctype.h</code>) and the definitions in namespace <code class="code">std::</code> (<code class="code"><cctype></code>). -</p></div><div class="section" title="No vector::at, deque::at, string::at"><div class="titlepage"><div><div><h4 class="title"><a id="id494566"/>No <code class="code">vector::at</code>, <code class="code">deque::at</code>, <code class="code">string::at</code></h4></div></div></div><p> +</p></div><div class="section" title="No vector::at, deque::at, string::at"><div class="titlepage"><div><div><h4 class="title"><a id="id710989"/>No <code class="code">vector::at</code>, <code class="code">deque::at</code>, <code class="code">string::at</code></h4></div></div></div><p> One solution is to add an autoconf-test for this: </p><pre class="programlisting"> AC_MSG_CHECKING(for container::at) @@ -180,7 +180,7 @@ AC_DEFINE(HAVE_CONTAINER_AT)], </pre><p> If you are using other (non-GNU) compilers it might be a good idea to check for <code class="code">string::at</code> separately. -</p></div><div class="section" title="No std::char_traits<char>::eof"><div class="titlepage"><div><div><h4 class="title"><a id="id494605"/>No <code class="code">std::char_traits<char>::eof</code></h4></div></div></div><p> +</p></div><div class="section" title="No std::char_traits<char>::eof"><div class="titlepage"><div><div><h4 class="title"><a id="id711028"/>No <code class="code">std::char_traits<char>::eof</code></h4></div></div></div><p> Use some kind of autoconf test, plus this: </p><pre class="programlisting"> #ifdef HAVE_CHAR_TRAITS @@ -188,7 +188,7 @@ AC_DEFINE(HAVE_CONTAINER_AT)], #else #define CPP_EOF EOF #endif -</pre></div><div class="section" title="No string::clear"><div class="titlepage"><div><div><h4 class="title"><a id="id494623"/>No <code class="code">string::clear</code></h4></div></div></div><p> +</pre></div><div class="section" title="No string::clear"><div class="titlepage"><div><div><h4 class="title"><a id="id711046"/>No <code class="code">string::clear</code></h4></div></div></div><p> There are two functions for deleting the contents of a string: <code class="code">clear</code> and <code class="code">erase</code> (the latter returns the string). @@ -206,12 +206,12 @@ erase(size_type __pos = 0, size_type __n = npos) Unfortunately, <code class="code">clear</code> is not implemented in this version, so you should use <code class="code">erase</code> (which is probably faster than <code class="code">operator=(charT*)</code>). -</p></div><div class="section" title="Removal of ostream::form and istream::scan extensions"><div class="titlepage"><div><div><h4 class="title"><a id="id494669"/> +</p></div><div class="section" title="Removal of ostream::form and istream::scan extensions"><div class="titlepage"><div><div><h4 class="title"><a id="id711092"/> Removal of <code class="code">ostream::form</code> and <code class="code">istream::scan</code> extensions </h4></div></div></div><p> These are no longer supported. Please use stringstreams instead. -</p></div><div class="section" title="No basic_stringbuf, basic_stringstream"><div class="titlepage"><div><div><h4 class="title"><a id="id494688"/>No <code class="code">basic_stringbuf</code>, <code class="code">basic_stringstream</code></h4></div></div></div><p> +</p></div><div class="section" title="No basic_stringbuf, basic_stringstream"><div class="titlepage"><div><div><h4 class="title"><a id="id711111"/>No <code class="code">basic_stringbuf</code>, <code class="code">basic_stringstream</code></h4></div></div></div><p> Although the ISO standard <code class="code">i/ostringstream</code>-classes are provided, (<code class="filename">sstream</code>), for compatibility with older implementations the pre-ISO @@ -299,14 +299,14 @@ any = temp; Another example of using stringstreams is in <a class="link" href="strings.html#strings.string.shrink" title="Shrink to Fit">this howto</a>. </p><p> There is additional information in the libstdc++-v2 info files, in particular <span class="quote">“<span class="quote">info iostream</span>”</span>. -</p></div><div class="section" title="Little or no wide character support"><div class="titlepage"><div><div><h4 class="title"><a id="id494844"/>Little or no wide character support</h4></div></div></div><p> +</p></div><div class="section" title="Little or no wide character support"><div class="titlepage"><div><div><h4 class="title"><a id="id711267"/>Little or no wide character support</h4></div></div></div><p> Classes <code class="classname">wstring</code> and <code class="classname">char_traits<wchar_t></code> are not supported. - </p></div><div class="section" title="No templatized iostreams"><div class="titlepage"><div><div><h4 class="title"><a id="id494863"/>No templatized iostreams</h4></div></div></div><p> + </p></div><div class="section" title="No templatized iostreams"><div class="titlepage"><div><div><h4 class="title"><a id="id711285"/>No templatized iostreams</h4></div></div></div><p> Classes <code class="classname">wfilebuf</code> and <code class="classname">wstringstream</code> are not supported. - </p></div><div class="section" title="Thread safety issues"><div class="titlepage"><div><div><h4 class="title"><a id="id494881"/>Thread safety issues</h4></div></div></div><p> + </p></div><div class="section" title="Thread safety issues"><div class="titlepage"><div><div><h4 class="title"><a id="id711304"/>Thread safety issues</h4></div></div></div><p> Earlier GCC releases had a somewhat different approach to threading configuration and proper compilation. Before GCC 3.0, configuration of the threading model was dictated by compiler @@ -364,7 +364,7 @@ libstdc++-v3. of the SGI STL (version 3.3), with extensive changes. </p><p>A more formal description of the V3 goals can be found in the official <a class="link" href="source_design_notes.html" title="Design Notes">design document</a>. - </p><p>Portability notes and known implementation limitations are as follows.</p><div class="section" title="Pre-ISO headers moved to backwards or removed"><div class="titlepage"><div><div><h4 class="title"><a id="id495006"/>Pre-ISO headers moved to backwards or removed</h4></div></div></div><p> The pre-ISO C++ headers + </p><p>Portability notes and known implementation limitations are as follows.</p><div class="section" title="Pre-ISO headers moved to backwards or removed"><div class="titlepage"><div><div><h4 class="title"><a id="id711429"/>Pre-ISO headers moved to backwards or removed</h4></div></div></div><p> The pre-ISO C++ headers (<code class="code">iostream.h</code>, <code class="code">defalloc.h</code> etc.) are available, unlike previous libstdc++ versions, but inclusion generates a warning that you are using deprecated headers. @@ -436,7 +436,7 @@ like <code class="filename">vector.h</code> can be replaced with <code class="fi directive <code class="code">using namespace std;</code> can be put at the global scope. This should be enough to get this code compiling, assuming the other usage is correct. -</p></div><div class="section" title="Extension headers hash_map, hash_set moved to ext or backwards"><div class="titlepage"><div><div><h4 class="title"><a id="id495090"/>Extension headers hash_map, hash_set moved to ext or backwards</h4></div></div></div><p>At this time most of the features of the SGI STL extension have been +</p></div><div class="section" title="Extension headers hash_map, hash_set moved to ext or backwards"><div class="titlepage"><div><div><h4 class="title"><a id="id711514"/>Extension headers hash_map, hash_set moved to ext or backwards</h4></div></div></div><p>At this time most of the features of the SGI STL extension have been replaced by standardized libraries. In particular, the unordered_map and unordered_set containers of TR1 are suitable replacement for the non-standard hash_map and hash_set @@ -508,7 +508,7 @@ AC_DEFUN([AC_HEADER_EXT_HASH_SET], [ AC_DEFINE(HAVE_EXT_HASH_SET,,[Define if ext/hash_set is present. ]) fi ]) -</pre></div><div class="section" title="No ios::nocreate/ios::noreplace."><div class="titlepage"><div><div><h4 class="title"><a id="id495193"/>No <code class="code">ios::nocreate/ios::noreplace</code>. +</pre></div><div class="section" title="No ios::nocreate/ios::noreplace."><div class="titlepage"><div><div><h4 class="title"><a id="id711617"/>No <code class="code">ios::nocreate/ios::noreplace</code>. </h4></div></div></div><p> The existence of <code class="code">ios::nocreate</code> being used for input-streams has been confirmed, most probably because the author thought it would be more correct to specify nocreate explicitly. So @@ -519,7 +519,7 @@ open the file for reading, check if it has been opened, and then decide whether you want to create/replace or not. To my knowledge, even older implementations support <code class="code">app</code>, <code class="code">ate</code> and <code class="code">trunc</code> (except for <code class="code">app</code> ?). -</p></div><div class="section" title="No stream::attach(int fd)"><div class="titlepage"><div><div><h4 class="title"><a id="id495241"/> +</p></div><div class="section" title="No stream::attach(int fd)"><div class="titlepage"><div><div><h4 class="title"><a id="id711664"/> No <code class="code">stream::attach(int fd)</code> </h4></div></div></div><p> Phil Edwards writes: It was considered and rejected for the ISO @@ -542,7 +542,7 @@ No <code class="code">stream::attach(int fd)</code> For another example of this, refer to <a class="link" href="http://www.josuttis.com/cppcode/fdstream.html">fdstream example</a> by Nicolai Josuttis. -</p></div><div class="section" title="Support for C++98 dialect."><div class="titlepage"><div><div><h4 class="title"><a id="id495309"/> +</p></div><div class="section" title="Support for C++98 dialect."><div class="titlepage"><div><div><h4 class="title"><a id="id711732"/> Support for C++98 dialect. </h4></div></div></div><p>Check for complete library coverage of the C++1998/2003 standard. </p><pre class="programlisting"> @@ -610,7 +610,7 @@ AC_DEFUN([AC_HEADER_STDCXX_98], [ AC_DEFINE(STDCXX_98_HEADERS,,[Define if ISO C++ 1998 header files are present. ]) fi ]) -</pre></div><div class="section" title="Support for C++TR1 dialect."><div class="titlepage"><div><div><h4 class="title"><a id="id495337"/> +</pre></div><div class="section" title="Support for C++TR1 dialect."><div class="titlepage"><div><div><h4 class="title"><a id="id711760"/> Support for C++TR1 dialect. </h4></div></div></div><p>Check for library coverage of the TR1 standard. </p><pre class="programlisting"> @@ -687,7 +687,7 @@ AC_DEFUN([AC_HEADER_TR1_UNORDERED_SET], [ AC_DEFINE(HAVE_TR1_UNORDERED_SET,,[Define if tr1/unordered_set is present. ]) fi ]) -</pre></div><div class="section" title="Support for C++0x dialect."><div class="titlepage"><div><div><h4 class="title"><a id="id495381"/> +</pre></div><div class="section" title="Support for C++0x dialect."><div class="titlepage"><div><div><h4 class="title"><a id="id711804"/> Support for C++0x dialect. </h4></div></div></div><p>Check for baseline language coverage in the compiler for the C++0xstandard. </p><pre class="programlisting"> @@ -899,22 +899,25 @@ AC_DEFUN([AC_HEADER_UNORDERED_SET], [ AC_DEFINE(HAVE_UNORDERED_SET,,[Define if unordered_set is present. ]) fi ]) -</pre></div><div class="section" title="Container::iterator_type is not necessarily Container::value_type*"><div class="titlepage"><div><div><h4 class="title"><a id="id495459"/> +</pre></div><div class="section" title="Container::iterator_type is not necessarily Container::value_type*"><div class="titlepage"><div><div><h4 class="title"><a id="id711882"/> Container::iterator_type is not necessarily Container::value_type* </h4></div></div></div><p> This is a change in behavior from the previous version. Now, most <span class="type">iterator_type</span> typedefs in container classes are POD objects, not <span class="type">value_type</span> pointers. -</p></div></div><div class="bibliography" title="Bibliography"><div class="titlepage"><div><div><h3 class="title"><a id="backwards.biblio"/>Bibliography</h3></div></div></div><div class="biblioentry"><a id="id495489"/><p><span class="biblioid"> - . </span><span class="citetitle"><em class="citetitle"> +</p></div></div><div class="bibliography" title="Bibliography"><div class="titlepage"><div><div><h3 class="title"><a id="backwards.biblio"/>Bibliography</h3></div></div></div><div class="biblioentry" title="Migrating to GCC 4.1"><a id="id711913"/><p><span class="title"><em> + <a class="link" href="http://www.kegel.com/gcc/gcc4.html"> Migrating to GCC 4.1 - </em>. </span><span class="author"><span class="firstname">Dan</span> <span class="surname">Kegel</span>. </span></p></div><div class="biblioentry"><a id="id495515"/><p><span class="biblioid"> - . </span><span class="citetitle"><em class="citetitle"> + </a> + </em>. </span><span class="author"><span class="firstname">Dan</span> <span class="surname">Kegel</span>. </span></p></div><div class="biblioentry" title="Building the Whole Debian Archive with GCC 4.1: A Summary"><a id="id711936"/><p><span class="title"><em> + <a class="link" href="http://lists.debian.org/debian-gcc/2006/03/msg00405.html"> Building the Whole Debian Archive with GCC 4.1: A Summary - </em>. </span><span class="author"><span class="firstname">Martin</span> <span class="surname">Michlmayr</span>. </span></p></div><div class="biblioentry"><a id="id495541"/><p><span class="biblioid"> - . </span><span class="citetitle"><em class="citetitle"> + </a> + </em>. </span><span class="author"><span class="firstname">Martin</span> <span class="surname">Michlmayr</span>. </span></p></div><div class="biblioentry" title="Migration guide for GCC-3.2"><a id="id711960"/><p><span class="title"><em> + <a class="link" href="http://annwm.lbl.gov/~leggett/Atlas/gcc-3.2.html"> Migration guide for GCC-3.2 - </em>. </span></p></div></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td align="left"><a accesskey="p" href="api.html">Prev</a> </td><td align="center"><a accesskey="u" href="appendix_porting.html">Up</a></td><td align="right"> <a accesskey="n" href="appendix_free.html">Next</a></td></tr><tr><td align="left" valign="top">API Evolution and Deprecation History </td><td align="center"><a accesskey="h" href="../spine.html">Home</a></td><td align="right" valign="top"> Appendix C. + </a> + </em>. </span></p></div></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td align="left"><a accesskey="p" href="api.html">Prev</a> </td><td align="center"><a accesskey="u" href="appendix_porting.html">Up</a></td><td align="right"> <a accesskey="n" href="appendix_free.html">Next</a></td></tr><tr><td align="left" valign="top">API Evolution and Deprecation History </td><td align="center"><a accesskey="h" href="../index.html">Home</a></td><td align="right" valign="top"> Appendix C. Free Software Needs Free Documentation </td></tr></table></div></body></html> |