1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>API Evolution and Deprecation History</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.78.1" /><meta name="keywords" content="ISO C++, api, evolution, deprecation, history" /><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="abi.html" title="ABI Policy and Guidelines" /><link rel="next" href="backwards.html" title="Backwards Compatibility" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">API Evolution and Deprecation History</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="abi.html">Prev</a> </td><th width="60%" align="center">Appendix B. 3 Porting and Maintenance 4 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> 6A 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> 8Extensions moved to <code class="filename">include/ext</code>. 9 </p><p> 10Include files from the SGI/HP sources that pre-date the ISO standard 11are added. These files are placed into 12the <code class="filename">include/backward</code> directory and a deprecated warning 13is added that notifies on inclusion (<code class="literal">-Wno-deprecated</code> 14deactivates 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> 18Extensions from SGI/HP moved from <code class="code">namespace std</code> 19to <code class="code">namespace __gnu_cxx</code>. As part of this, the following 20new includes are 21added: <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> 23Extensions 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> 25Extensions to tree data structures added in <code class="filename">ext/rb_tree</code>. 26</p><p> 27Removal 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> 41Large 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> 44Support 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> 46Support for <code class="code">char_traits</code> beyond builtin types. 47</p><p> 48Conformant <code class="code">allocator</code> class and usage in containers. As 49part of this, the following extensions are 50added: <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> 52This is a change from all previous versions, and may require 53source-level changes due to allocator-related changes to structures 54names and template parameters, filenames, and file locations. Some, 55like <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<T,A></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<T,A></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<T, __alloc></code> is thus the same as 75 <code class="code">allocator<T></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="table.extension_allocators"></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<T></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<T></code></td><td align="left"><code class="filename">ext/malloc_allocator.h</code></td><td align="left"><code class="classname">std::__malloc_alloc_template<int></code></td><td align="left"><code class="filename">memory</code></td></tr><tr><td align="left"><code class="classname">__gnu_cxx::debug_allocator<T></code></td><td align="left"><code class="filename">ext/debug_allocator.h</code></td><td align="left"><code class="classname">std::debug_alloc<T></code></td><td align="left"><code class="filename">memory</code></td></tr><tr><td align="left"><code class="classname">__gnu_cxx::__pool_alloc<T></code></td><td align="left"><code class="filename">ext/pool_allocator.h</code></td><td align="left"><code class="classname">std::__default_alloc_template<bool,int></code></td><td align="left"><code class="filename">memory</code></td></tr><tr><td align="left"><code class="classname">__gnu_cxx::__mt_alloc<T></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<T></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="table.extension_allocators2"></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<T></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<T></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> 85Debug mode first appears. 86</p><p> 87Precompiled header support <acronym class="acronym">PCH</acronym> support. 88</p><p> 89Macro guard for changed, from <code class="literal">_GLIBCPP_</code> to <code class="literal">_GLIBCXX_</code>. 90</p><p> 91Extension <code class="filename">ext/stdio_sync_filebuf.h</code> added. 92</p><p> 93Extension <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> 96TR1 features first appear. 97</p><p> 98Extension allocator <code class="filename">ext/array_allocator.h</code> added. 99</p><p> 100Extension <code class="code">codecvt</code> specializations moved to <code class="filename">ext/codecvt_specializations.h</code>. 101</p><p> 102Removal 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> 105Removal 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, 107types, 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 113into <code class="filename">ext/concurrence.h</code> and <code class="filename">ext/atomicity.h</code>, 114including change of namespace to <code class="code">__gnu_cxx</code> in some 115cases. Added types 116include <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 117into <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, 120types, namespace moved to <code class="code">__pb_ds</code>. 121</p><p> Extensions for debug mode modified: now nested in <code class="code">namespace 122std::__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> 124and <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> 127C++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> 130Backward 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> 142Header 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> 144Debug mode for <code class="filename">unordered_map</code> and <code class="filename">unordered_set</code>. 145</p><p> 146Parallel 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> 154PCH binary files no longer installed. Instead, the source files are installed. 155</p><p> 156Namespace 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> 159C++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> 201Uglification of <code class="literal">try</code> to <code class="literal">__try</code> 202and <code class="literal">catch</code> to <code class="literal">__catch</code>. 203 </p><p> 204Audit of internal mutex usage, conversion to functions returning static 205local mutex. 206 </p><p> Extensions 207added: <code class="filename">ext/pointer.h</code> 208and <code class="filename">ext/extptr_allocator.h</code>. Support 209for non-standard pointer types has been added 210to <code class="classname">vector</code> 211and <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> 214C++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> 230Profile mode first appears. 231</p><p> 232Support 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> 234Python pretty-printers are added for use with appropriately-advanced versions of <span class="command"><strong>gdb</strong></span>. 235</p><p> 236Audit for application of function attributes nothrow, const, pure, and noreturn. 237</p><p> 238The default behavior for comparing typeinfo names changed, so 239in <code class="filename">typeinfo</code>, <code class="literal">__GXX_MERGED_TYPEINFO_NAMES</code> 240now 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 class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_50"></a><code class="constant">5</code></h3></div></div></div><p> 267 ABI transition adds new implementations of several components, using the 268 <code class="code">abi_tag</code> attribute and the <code class="code">__cxx11</code> inline 269 namespace to distinguish the new entities from the old ones. 270</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> 271 Use of the new or old ABI can be selected per-translation unit with the 272 <span class="symbol">_GLIBCXX_USE_CXX11_ABI</span> macro. 273 </p></li><li class="listitem"><p> 274 New non-reference-counted <code class="classname">string</code> implementation. 275 </p></li><li class="listitem"><p> 276 New <code class="classname">list</code> implementation containing a new 277 data member in order to provide O(1) <code class="function">size()</code>. 278 </p></li></ul></div><p> 279 C++11 support completed (movable iostreams, new I/O manipulators, 280 Unicode conversion utilities, atomic operations for 281 <code class="classname">shared_ptr</code>, functions for notifying condition 282 variables and making futures ready at thread exit). 283</p><p> 284 Changed formatting of floating point types when 285 <code class="code">ios_base::fixed|ios_base::scientific</code> is set in a stream's 286 format flags. 287</p><p> Improved C++14 support and TS implementations. </p><p> New random number engines and distributions. </p><p> 288 GDB Xmethods for containers and <code class="classname">unique_ptr</code> added. 289</p><p> 290 <code class="classname">has_trivial_default_constructor</code>, 291 <code class="classname">has_trivial_copy_constructor</code> and 292 <code class="classname">has_trivial_copy_assign</code> deprecated. 293</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>