gcc-4_9-branch/libstdc++-v3/doc/html/manual/api.html

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   3   Porting and Maintenance
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   5 </th><td width="20%" align="right"> <a accesskey="n" href="backwards.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="appendix.porting.api"></a>API Evolution and Deprecation History</h2></div></div></div><p>
   6 A list of user-visible changes, in chronological order
   7 </p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_300"></a><code class="constant">3.0</code></h3></div></div></div><p>
   8 Extensions moved to <code class="filename">include/ext</code>.
   9   </p><p>
  10 Include files from the SGI/HP sources that pre-date the ISO standard
  11 are added. These files are placed into
  12 the <code class="filename">include/backward</code> directory and a deprecated warning
  13 is added that notifies on inclusion (<code class="literal">-Wno-deprecated</code>
  14 deactivates the warning.)
  15 </p><p>Deprecated include <code class="filename">backward/strstream</code> added.</p><p>Removal of include <code class="filename">builtinbuf.h</code>, <code class="filename">indstream.h</code>, <code class="filename">parsestream.h</code>, <code class="filename">PlotFile.h</code>, <code class="filename">SFile.h</code>, <code class="filename">stdiostream.h</code>, and <code class="filename">stream.h</code>.
  16 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_310"></a><code class="constant">3.1</code></h3></div></div></div><p>
  17   </p><p>
  18 Extensions from SGI/HP moved from <code class="code">namespace std</code>
  19 to <code class="code">namespace __gnu_cxx</code>. As part of this, the following
  20 new includes are
  21 added: <code class="filename">ext/algorithm</code>, <code class="filename">ext/functional</code>, <code class="filename">ext/iterator</code>, <code class="filename">ext/memory</code>, and <code class="filename">ext/numeric</code>.
  22 </p><p>
  23 Extensions to <code class="code">basic_filebuf</code> introduced: <code class="code">__gnu_cxx::enc_filebuf</code>, and <code class="code">__gnu_cxx::stdio_filebuf</code>.
  24 </p><p>
  25 Extensions to tree data structures added in <code class="filename">ext/rb_tree</code>.
  26 </p><p>
  27 Removal of <code class="filename">ext/tree</code>, moved to <code class="filename">backward/tree.h</code>.
  28 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_320"></a><code class="constant">3.2</code></h3></div></div></div><p>
  29   </p><p>Symbol versioning introduced for shared library.</p><p>Removal of include <code class="filename">backward/strstream.h</code>.</p><p>Allocator changes. Change <code class="code">__malloc_alloc</code> to <code class="code">malloc_allocator</code> and <code class="code">__new_alloc</code> to <code class="code">new_allocator</code>. </p><p> For GCC releases from 2.95 through the 3.1 series, defining
  30    <code class="literal">__USE_MALLOC</code> on the gcc command line would change the
  31    default allocation strategy to instead use <code class="code"> malloc</code> and
  32    <code class="function">free</code>. For the 3.2 and 3.3 release series the same
  33    functionality was spelled <code class="literal">_GLIBCXX_FORCE_NEW</code>. From
  34    GCC 3.4 onwards the functionality is enabled by setting
  35    <code class="literal">GLIBCXX_FORCE_NEW</code> in the environment, see
  36    <a class="link" href="mt_allocator.html" title="Chapter 20. The mt_allocator">the mt allocator chapter</a>
  37    for details.
  38    </p><p>Error handling in iostreams cleaned up, made consistent. </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_330"></a><code class="constant">3.3</code></h3></div></div></div><p>
  39   </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_340"></a><code class="constant">3.4</code></h3></div></div></div><p>
  40   </p><p>
  41 Large file support.
  42 </p><p> Extensions for generic characters and <code class="code">char_traits</code> added in <code class="filename">ext/pod_char_traits.h</code>.
  43 </p><p>
  44 Support for <code class="code">wchar_t</code> specializations of <code class="code">basic_filebuf</code> enhanced to support <code class="code">UTF-8</code> and <code class="code">Unicode</code>, depending on host. More hosts support basic <code class="code">wchar_t</code> functionality.
  45 </p><p>
  46 Support for <code class="code">char_traits</code> beyond builtin types.
  47 </p><p>
  48 Conformant <code class="code">allocator</code> class and usage in containers. As
  49 part of this, the following extensions are
  50 added: <code class="filename">ext/bitmap_allocator.h</code>, <code class="filename">ext/debug_allocator.h</code>, <code class="filename">ext/mt_allocator.h</code>, <code class="filename">ext/malloc_allocator.h</code>,<code class="filename">ext/new_allocator.h</code>, <code class="filename">ext/pool_allocator.h</code>.
  51 </p><p>
  52 This is a change from all previous versions, and may require
  53 source-level changes due to allocator-related changes to structures
  54 names and template parameters, filenames, and file locations. Some,
  55 like <code class="code">__simple_alloc, __allocator, __alloc, </code> and <code class="code">
  56 _Alloc_traits</code> have been removed.
  57 </p><p>Default behavior of <code class="code">std::allocator</code> has changed.</p><p>
  58    Previous versions prior to 3.4 cache allocations in a memory
  59    pool, instead of passing through to call the global allocation
  60    operators (i.e., <code class="classname">__gnu_cxx::pool_allocator</code>).  More
  61    recent versions default to the
  62    simpler <code class="classname">__gnu_cxx::new_allocator</code>.
  63 </p><p> Previously, all allocators were written to the SGI
  64    style, and all STL containers expected this interface. This
  65    interface had a traits class called <code class="code">_Alloc_traits</code> that
  66    attempted to provide more information for compile-time allocation
  67    selection and optimization. This traits class had another allocator
  68    wrapper, <code class="code">__simple_alloc&lt;T,A&gt;</code>, which was a
  69    wrapper around another allocator, A, which itself is an allocator
  70    for instances of T. But wait, there's more:
  71    <code class="code">__allocator&lt;T,A&gt;</code> is another adapter.  Many of
  72    the provided allocator classes were SGI style: such classes can be
  73    changed to a conforming interface with this wrapper:
  74    <code class="code">__allocator&lt;T, __alloc&gt;</code> is thus the same as
  75    <code class="code">allocator&lt;T&gt;</code>.
  76    </p><p> The class <code class="classname">allocator</code> used the typedef
  77    <span class="type">__alloc</span> to select an underlying allocator that
  78    satisfied memory allocation requests. The selection of this
  79    underlying allocator was not user-configurable.
  80    </p><div class="table"><a id="idm270857241760"></a><p class="title"><strong>Table B.6. Extension Allocators</strong></p><div class="table-contents"><table summary="Extension Allocators" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Allocator (3.4)</th><th align="left">Header (3.4)</th><th align="left">Allocator (3.[0-3])</th><th align="left">Header (3.[0-3])</th></tr></thead><tbody><tr><td align="left"><code class="classname">__gnu_cxx::new_allocator&lt;T&gt;</code></td><td align="left"><code class="filename">ext/new_allocator.h</code></td><td align="left"><code class="classname">std::__new_alloc</code></td><td align="left"><code class="filename">memory</code></td></tr><tr><td align="left"><code class="classname">__gnu_cxx::malloc_allocator&lt;T&gt;</code></td><td align="left"><code class="filename">ext/malloc_allocator.h</code></td><td align="left"><code class="classname">std::__malloc_alloc_template&lt;int&gt;</code></td><td align="left"><code class="filename">memory</code></td></tr><tr><td align="left"><code class="classname">__gnu_cxx::debug_allocator&lt;T&gt;</code></td><td align="left"><code class="filename">ext/debug_allocator.h</code></td><td align="left"><code class="classname">std::debug_alloc&lt;T&gt;</code></td><td align="left"><code class="filename">memory</code></td></tr><tr><td align="left"><code class="classname">__gnu_cxx::__pool_alloc&lt;T&gt;</code></td><td align="left"><code class="filename">ext/pool_allocator.h</code></td><td align="left"><code class="classname">std::__default_alloc_template&lt;bool,int&gt;</code></td><td align="left"><code class="filename">memory</code></td></tr><tr><td align="left"><code class="classname">__gnu_cxx::__mt_alloc&lt;T&gt;</code></td><td align="left"><code class="filename">ext/mt_allocator.h</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left"><code class="classname">__gnu_cxx::bitmap_allocator&lt;T&gt;</code></td><td align="left"><code class="filename">ext/bitmap_allocator.h</code></td><td align="left"> </td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /><p> Releases after gcc-3.4 have continued to add to the collection
  81    of available allocators. All of these new allocators are
  82    standard-style. The following table includes details, along with
  83    the first released version of GCC that included the extension allocator.
  84    </p><div class="table"><a id="idm270857214128"></a><p class="title"><strong>Table B.7. Extension Allocators Continued</strong></p><div class="table-contents"><table summary="Extension Allocators Continued" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /></colgroup><thead><tr><th align="left">Allocator</th><th align="left">Include</th><th align="left">Version</th></tr></thead><tbody><tr><td align="left"><code class="classname">__gnu_cxx::array_allocator&lt;T&gt;</code></td><td align="left"><code class="filename">ext/array_allocator.h</code></td><td align="left">4.0.0</td></tr><tr><td align="left"><code class="classname">__gnu_cxx::throw_allocator&lt;T&gt;</code></td><td align="left"><code class="filename">ext/throw_allocator.h</code></td><td align="left">4.2.0</td></tr></tbody></table></div></div><br class="table-break" /><p>
  85 Debug mode first appears.
  86 </p><p>
  87 Precompiled header support <acronym class="acronym">PCH</acronym> support.
  88 </p><p>
  89 Macro guard for changed, from <code class="literal">_GLIBCPP_</code> to <code class="literal">_GLIBCXX_</code>.
  90 </p><p>
  91 Extension <code class="filename">ext/stdio_sync_filebuf.h</code> added.
  92 </p><p>
  93 Extension <code class="filename">ext/demangle.h</code> added.
  94 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_400"></a><code class="constant">4.0</code></h3></div></div></div><p>
  95   </p><p>
  96 TR1 features first appear.
  97 </p><p>
  98 Extension allocator <code class="filename">ext/array_allocator.h</code> added.
  99 </p><p>
 100 Extension <code class="code">codecvt</code> specializations moved to <code class="filename">ext/codecvt_specializations.h</code>.
 101 </p><p>
 102 Removal of <code class="filename">ext/demangle.h</code>.
 103 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_410"></a><code class="constant">4.1</code></h3></div></div></div><p>
 104   </p><p>
 105 Removal of <code class="filename">cassert</code> from all standard headers: now has to be explicitly included for <code class="code">std::assert</code> calls.
 106 </p><p> Extensions for policy-based data structures first added. New includes,
 107 types, namespace <code class="code">pb_assoc</code>.
 108 </p><p> Extensions for typelists added in <code class="filename">ext/typelist.h</code>.
 109 </p><p> Extension for policy-based <code class="code">basic_string</code> first added: <code class="code">__gnu_cxx::__versa_string</code> in <code class="filename">ext/vstring.h</code>.
 110 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_420"></a><code class="constant">4.2</code></h3></div></div></div><p>
 111   </p><p> Default visibility attributes applied to <code class="code">namespace std</code>. Support for <code class="code">-fvisibility</code>.
 112 </p><p>TR1 <code class="filename">random</code>, <code class="filename">complex</code>, and C compatibility headers added.</p><p> Extensions for concurrent programming consolidated
 113 into <code class="filename">ext/concurrence.h</code> and <code class="filename">ext/atomicity.h</code>,
 114 including change of namespace to <code class="code">__gnu_cxx</code> in some
 115 cases. Added types
 116 include <code class="code">_Lock_policy</code>, <code class="code">__concurrence_lock_error</code>, <code class="code">__concurrence_unlock_error</code>, <code class="code">__mutex</code>, <code class="code">__scoped_lock</code>.</p><p> Extensions for type traits consolidated
 117 into <code class="filename">ext/type_traits.h</code>. Additional traits are added
 118 (<code class="code">__conditional_type</code>, <code class="code">__enable_if</code>, others.)
 119 </p><p> Extensions for policy-based data structures revised. New includes,
 120 types, namespace moved to <code class="code">__pb_ds</code>.
 121 </p><p> Extensions for debug mode modified: now nested in <code class="code">namespace
 122 std::__debug</code> and extensions in <code class="code">namespace
 123 __gnu_cxx::__debug</code>.</p><p> Extensions added: <code class="filename">ext/typelist.h</code>
 124 and <code class="filename">ext/throw_allocator.h</code>.
 125 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_430"></a><code class="constant">4.3</code></h3></div></div></div><p>
 126   </p><p>
 127 C++0X features first appear.
 128 </p><p>TR1 <code class="filename">regex</code> and <code class="filename">cmath</code>'s mathematical special function added.
 129 </p><p>
 130 Backward include edit.
 131 </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>Removed</p><p>
 132 <code class="filename">algobase.h</code> <code class="filename">algo.h</code> <code class="filename">alloc.h</code> <code class="filename">bvector.h</code> <code class="filename">complex.h</code>
 133 <code class="filename">defalloc.h</code> <code class="filename">deque.h</code> <code class="filename">fstream.h</code> <code class="filename">function.h</code> <code class="filename">hash_map.h</code> <code class="filename">hash_set.h</code>
 134 <code class="filename">hashtable.h</code> <code class="filename">heap.h</code> <code class="filename">iomanip.h</code> <code class="filename">iostream.h</code> <code class="filename">istream.h</code> <code class="filename">iterator.h</code>
 135 <code class="filename">list.h</code> <code class="filename">map.h</code> <code class="filename">multimap.h</code> <code class="filename">multiset.h</code> <code class="filename">new.h</code> <code class="filename">ostream.h</code> <code class="filename">pair.h</code> <code class="filename">queue.h</code> <code class="filename">rope.h</code> <code class="filename">set.h</code> <code class="filename">slist.h</code> <code class="filename">stack.h</code> <code class="filename">streambuf.h</code> <code class="filename">stream.h</code> <code class="filename">tempbuf.h</code>
 136 <code class="filename">tree.h</code> <code class="filename">vector.h</code>
 137   </p></li><li class="listitem"><p>Added</p><p>
 138   <code class="filename">hash_map</code> and <code class="filename">hash_set</code>
 139   </p></li><li class="listitem"><p>Added in C++11</p><p>
 140     <code class="filename">auto_ptr.h</code> and <code class="filename">binders.h</code>
 141   </p></li></ul></div><p>
 142 Header dependency streamlining.
 143 </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><code class="filename">algorithm</code> no longer includes <code class="filename">climits</code>, <code class="filename">cstring</code>, or <code class="filename">iosfwd</code> </p></li><li class="listitem"><p><code class="filename">bitset</code> no longer includes <code class="filename">istream</code> or <code class="filename">ostream</code>, adds <code class="filename">iosfwd</code> </p></li><li class="listitem"><p><code class="filename">functional</code> no longer includes <code class="filename">cstddef</code></p></li><li class="listitem"><p><code class="filename">iomanip</code> no longer includes <code class="filename">istream</code>, <code class="filename">istream</code>, or <code class="filename">functional</code>, adds <code class="filename">ioswd</code> </p></li><li class="listitem"><p><code class="filename">numeric</code> no longer includes <code class="filename">iterator</code></p></li><li class="listitem"><p><code class="filename">string</code> no longer includes <code class="filename">algorithm</code> or <code class="filename">memory</code></p></li><li class="listitem"><p><code class="filename">valarray</code> no longer includes <code class="filename">numeric</code> or <code class="filename">cstdlib</code></p></li><li class="listitem"><p><code class="filename">tr1/hashtable</code> no longer includes <code class="filename">memory</code> or <code class="filename">functional</code></p></li><li class="listitem"><p><code class="filename">tr1/memory</code> no longer includes <code class="filename">algorithm</code></p></li><li class="listitem"><p><code class="filename">tr1/random</code> no longer includes <code class="filename">algorithm</code> or <code class="filename">fstream</code></p></li></ul></div><p>
 144 Debug mode for <code class="filename">unordered_map</code> and <code class="filename">unordered_set</code>.
 145 </p><p>
 146 Parallel mode first appears.
 147 </p><p>Variadic template implementations of items in <code class="filename">tuple</code> and
 148     <code class="filename">functional</code>.
 149 </p><p>Default <code class="code">what</code> implementations give more elaborate
 150     exception strings for <code class="code">bad_cast</code>,
 151     <code class="code">bad_typeid</code>, <code class="code">bad_exception</code>, and
 152     <code class="code">bad_alloc</code>.
 153 </p><p>
 154 PCH binary files no longer installed. Instead, the source files are installed.
 155 </p><p>
 156 Namespace pb_ds moved to __gnu_pb_ds.
 157 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_440"></a><code class="constant">4.4</code></h3></div></div></div><p>
 158   </p><p>
 159 C++0X features.
 160 </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>
 161     Added.
 162   </p><p>
 163     <code class="filename">atomic</code>,
 164     <code class="filename">chrono</code>,
 165     <code class="filename">condition_variable</code>,
 166     <code class="filename">forward_list</code>,
 167     <code class="filename">initializer_list</code>,
 168     <code class="filename">mutex</code>,
 169     <code class="filename">ratio</code>,
 170     <code class="filename">thread</code>
 171   </p></li><li class="listitem"><p>
 172     Updated and improved.
 173   </p><p>
 174     <code class="filename">algorithm</code>,
 175     <code class="filename">system_error</code>,
 176     <code class="filename">type_traits</code>
 177   </p></li><li class="listitem"><p>
 178     Use of the GNU extension namespace association converted to inline namespaces.
 179   </p></li><li class="listitem"><p>
 180     Preliminary support for <code class="classname">initializer_list</code>
 181     and defaulted and deleted constructors in container classes.
 182   </p></li><li class="listitem"><p>
 183     <code class="classname">unique_ptr</code>.
 184   </p></li><li class="listitem"><p>
 185     Support for new character types <span class="type">char16_t</span>
 186     and <span class="type">char32_t</span> added
 187     to <code class="classname">char_traits</code>, <code class="classname">basic_string</code>, <code class="classname">numeric_limits</code>,
 188     and assorted compile-time type traits.
 189   </p></li><li class="listitem"><p>
 190     Support for string conversions <code class="function">to_string</code>
 191     and <code class="function">to_wstring</code>.
 192   </p></li><li class="listitem"><p>
 193     Member functions taking string arguments were added to iostreams
 194     including <code class="classname">basic_filebuf</code>, <code class="classname">basic_ofstream</code>,
 195     and <code class="classname">basic_ifstream</code>.
 196   </p></li><li class="listitem"><p>
 197     Exception propagation support,
 198     including <code class="classname">exception_ptr</code>, <code class="function">current_exception</code>, <code class="function">copy_exception</code>,
 199     and <code class="function">rethrow_exception</code>.
 200   </p></li></ul></div><p>
 201 Uglification of <code class="literal">try</code> to <code class="literal">__try</code>
 202 and <code class="literal">catch</code> to <code class="literal">__catch</code>.
 203   </p><p>
 204 Audit of internal mutex usage, conversion to functions returning static
 205 local mutex.
 206   </p><p> Extensions
 207 added: <code class="filename">ext/pointer.h</code>
 208 and <code class="filename">ext/extptr_allocator.h</code>. Support
 209 for non-standard pointer types has been added
 210 to <code class="classname">vector</code>
 211 and <code class="classname">forward_list</code>.
 212 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_450"></a><code class="constant">4.5</code></h3></div></div></div><p>
 213   </p><p>
 214 C++0X features.
 215 </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>
 216     Added.
 217   </p><p>
 218     <code class="filename">functional</code>,
 219     <code class="filename">future</code>,
 220     <code class="filename">random</code>
 221   </p></li><li class="listitem"><p>
 222     Updated and improved.
 223   </p><p>
 224     <code class="filename">atomic</code>,
 225     <code class="filename">system_error</code>,
 226     <code class="filename">type_traits</code>
 227   </p></li><li class="listitem"><p>
 228     Add support for explicit operators and standard layout types.
 229   </p></li></ul></div><p>
 230 Profile mode first appears.
 231 </p><p>
 232 Support for decimal floating-point arithmetic, including <code class="classname">decimal32</code>, <code class="classname">decimal64</code>, and <code class="classname">decimal128</code>.
 233 </p><p>
 234 Python pretty-printers are added for use with appropriately-advanced versions of <span class="command"><strong>gdb</strong></span>.
 235 </p><p>
 236 Audit for application of function attributes nothrow, const, pure, and noreturn.
 237 </p><p>
 238 The default behavior for comparing typeinfo names changed, so
 239 in <code class="filename">typeinfo</code>, <code class="literal">__GXX_MERGED_TYPEINFO_NAMES</code>
 240 now defaults to zero.
 241 </p><p> Extensions modified: <code class="filename">ext/throw_allocator.h</code>.
 242 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_460"></a><code class="constant">4.6</code></h3></div></div></div><p>
 243   Use constexpr and nullptr where appropriate throughout the library.
 244 </p><p>
 245   The library was updated to avoid including
 246   <code class="filename">stddef.h</code> in order
 247   to reduce namespace pollution.
 248 </p><p>Reference-count annotations to assist data race detectors.
 249 </p><p>
 250   Added <code class="function">make_exception_ptr</code> as an alias of
 251   <code class="function">copy_exception</code>.
 252 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_470"></a><code class="constant">4.7</code></h3></div></div></div><p>Use of noexcept throughout library.</p><p>Partial support for C++11 allocators first appears.</p><p>
 253   <code class="classname">monotonic_clock</code> renamed to
 254   <code class="classname">steady_clock</code> as required by the final C++11
 255   standard.
 256 </p><p>A new clocale model for newlib is available.</p><p>
 257   The library was updated to avoid including
 258   <code class="filename">unistd.h</code> in order
 259   to reduce namespace pollution.
 260 </p><p>Debug Mode was improved for unordered containers. </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_480"></a><code class="constant">4.8</code></h3></div></div></div><p>
 261   New random number engines and distributions.
 262   Optimisations for random.
 263 </p><p>New --enable-libstdcxx-verbose configure option</p><p>
 264   The --enable-libstdcxx-time configure option becomes unnecessary given a
 265   sufficiently recent glibc.
 266 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_490"></a><code class="constant">4.9</code></h3></div></div></div><p> Implementation of <code class="classname">regex</code> completed. </p><p> C++14 library and TS implementations are added. </p><p> <code class="function">copy_exception</code> deprecated. </p><p> <code class="classname">__gnu_cxx::array_allocator</code> deprecated. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="abi.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="appendix_porting.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="backwards.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ABI Policy and Guidelines </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Backwards Compatibility</td></tr></table></div></body></html>