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5fdbeb16 | 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 Stylesheets Vsnapshot" /><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. |
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3 | Porting and Maintenance |
4 | ||
53b03cce | 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> |
4394b61e | 6 | A list of user-visible changes, in chronological order |
53b03cce | 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> |
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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.) | |
cad3fc8c | 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>. |
53b03cce | 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> |
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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 | |
cad3fc8c | 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>. |
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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> | |
cad3fc8c | 25 | Extensions to tree data structures added in <code class="filename"><ext/rb_tree></code>. |
46abada0 | 26 | </p><p> |
cad3fc8c | 27 | Removal of <code class="filename"><ext/tree></code>, moved to <code class="filename"><backward/tree.h></code>. |
53b03cce | 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> |
cad3fc8c | 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 |
46abada0 | 30 | <code class="literal">__USE_MALLOC</code> on the gcc command line would change the |
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31 | default allocation strategy to instead use <code class="code">malloc</code> and |
32 | <code class="code">free</code>. For the 3.2 and 3.3 release series the same | |
3f6de40f | 33 | functionality was spelled <code class="literal">_GLIBCXX_FORCE_NEW</code>. From |
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34 | GCC 3.4 onwards the default allocator uses <code class="code">new</code> anyway, |
35 | but for the optional pooling allocators the functionality is enabled by | |
36 | setting <code class="literal">GLIBCXX_FORCE_NEW</code> in the environment, see | |
544be2be | 37 | <a class="link" href="mt_allocator.html" title="Chapter 19. The mt_allocator">the mt allocator chapter</a> |
7fa94fbb | 38 | for details. |
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39 | </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> |
40 | </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> | |
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41 | </p><p> |
42 | Large file support. | |
cad3fc8c | 43 | </p><p> Extensions for generic characters and <code class="code">char_traits</code> added in <code class="filename"><ext/pod_char_traits.h></code>. |
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44 | </p><p> |
45 | 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. | |
46 | </p><p> | |
47 | Support for <code class="code">char_traits</code> beyond builtin types. | |
48 | </p><p> | |
49 | Conformant <code class="code">allocator</code> class and usage in containers. As | |
50 | part of this, the following extensions are | |
cad3fc8c | 51 | 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>. |
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52 | </p><p> |
53 | This is a change from all previous versions, and may require | |
54 | source-level changes due to allocator-related changes to structures | |
55 | names and template parameters, filenames, and file locations. Some, | |
56 | like <code class="code">__simple_alloc, __allocator, __alloc, </code> and <code class="code"> | |
57 | _Alloc_traits</code> have been removed. | |
58 | </p><p>Default behavior of <code class="code">std::allocator</code> has changed.</p><p> | |
59 | Previous versions prior to 3.4 cache allocations in a memory | |
60 | pool, instead of passing through to call the global allocation | |
4394b61e | 61 | operators (i.e., <code class="classname">__gnu_cxx::pool_allocator</code>). More |
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62 | recent versions default to the |
63 | simpler <code class="classname">__gnu_cxx::new_allocator</code>. | |
64 | </p><p> Previously, all allocators were written to the SGI | |
65 | style, and all STL containers expected this interface. This | |
66 | interface had a traits class called <code class="code">_Alloc_traits</code> that | |
67 | attempted to provide more information for compile-time allocation | |
68 | selection and optimization. This traits class had another allocator | |
69 | wrapper, <code class="code">__simple_alloc<T,A></code>, which was a | |
70 | wrapper around another allocator, A, which itself is an allocator | |
71 | for instances of T. But wait, there's more: | |
72 | <code class="code">__allocator<T,A></code> is another adapter. Many of | |
73 | the provided allocator classes were SGI style: such classes can be | |
74 | changed to a conforming interface with this wrapper: | |
75 | <code class="code">__allocator<T, __alloc></code> is thus the same as | |
76 | <code class="code">allocator<T></code>. | |
77 | </p><p> The class <code class="classname">allocator</code> used the typedef | |
78 | <span class="type">__alloc</span> to select an underlying allocator that | |
79 | satisfied memory allocation requests. The selection of this | |
80 | underlying allocator was not user-configurable. | |
cad3fc8c | 81 | </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 class="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 |
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82 | of available allocators. All of these new allocators are |
83 | standard-style. The following table includes details, along with | |
84 | the first released version of GCC that included the extension allocator. | |
cad3fc8c | 85 | </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 class="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> |
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86 | Debug mode first appears. |
87 | </p><p> | |
88 | Precompiled header support <acronym class="acronym">PCH</acronym> support. | |
89 | </p><p> | |
90 | Macro guard for changed, from <code class="literal">_GLIBCPP_</code> to <code class="literal">_GLIBCXX_</code>. | |
91 | </p><p> | |
cad3fc8c | 92 | Extension <code class="filename"><ext/stdio_sync_filebuf.h></code> added. |
46abada0 | 93 | </p><p> |
cad3fc8c | 94 | Extension <code class="filename"><ext/demangle.h></code> added. |
53b03cce | 95 | </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> |
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96 | </p><p> |
97 | TR1 features first appear. | |
98 | </p><p> | |
cad3fc8c | 99 | Extension allocator <code class="filename"><ext/array_allocator.h></code> added. |
46abada0 | 100 | </p><p> |
cad3fc8c | 101 | Extension <code class="code">codecvt</code> specializations moved to <code class="filename"><ext/codecvt_specializations.h></code>. |
46abada0 | 102 | </p><p> |
cad3fc8c | 103 | Removal of <code class="filename"><ext/demangle.h></code>. |
53b03cce | 104 | </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> |
46abada0 | 105 | </p><p> |
cad3fc8c | 106 | 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. |
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107 | </p><p> Extensions for policy-based data structures first added. New includes, |
108 | types, namespace <code class="code">pb_assoc</code>. | |
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109 | </p><p> Extensions for typelists added in <code class="filename"><ext/typelist.h></code>. |
110 | </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>. | |
53b03cce | 111 | </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> |
46abada0 | 112 | </p><p> Default visibility attributes applied to <code class="code">namespace std</code>. Support for <code class="code">-fvisibility</code>. |
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113 | </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 |
114 | into <code class="filename"><ext/concurrence.h></code> and <code class="filename"><ext/atomicity.h></code>, | |
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115 | including change of namespace to <code class="code">__gnu_cxx</code> in some |
116 | cases. Added types | |
117 | 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 | |
cad3fc8c | 118 | into <code class="filename"><ext/type_traits.h></code>. Additional traits are added |
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119 | (<code class="code">__conditional_type</code>, <code class="code">__enable_if</code>, others.) |
120 | </p><p> Extensions for policy-based data structures revised. New includes, | |
121 | types, namespace moved to <code class="code">__pb_ds</code>. | |
122 | </p><p> Extensions for debug mode modified: now nested in <code class="code">namespace | |
123 | std::__debug</code> and extensions in <code class="code">namespace | |
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124 | __gnu_cxx::__debug</code>.</p><p> Extensions added: <code class="filename"><ext/typelist.h></code> |
125 | and <code class="filename"><ext/throw_allocator.h></code>. | |
53b03cce | 126 | </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> |
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127 | </p><p> |
128 | C++0X features first appear. | |
cad3fc8c | 129 | </p><p>TR1 <code class="filename"><regex></code> and <code class="filename"><cmath></code>'s mathematical special function added. |
4396e063 | 130 | </p><p> |
46abada0 | 131 | Backward include edit. |
53b03cce | 132 | </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>Removed</p><p> |
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133 | <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> |
134 | <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> | |
135 | <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> | |
136 | <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> | |
137 | <code class="filename"><tree.h></code> <code class="filename"><vector.h></code> | |
4396e063 | 138 | </p></li><li class="listitem"><p>Added</p><p> |
cad3fc8c | 139 | <code class="filename"><hash_map></code> and <code class="filename"><hash_set></code> |
f25481f4 | 140 | </p></li><li class="listitem"><p>Added in C++11</p><p> |
cad3fc8c | 141 | <code class="filename"><auto_ptr.h></code> and <code class="filename"><binders.h></code> |
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142 | </p></li></ul></div><p> |
143 | Header dependency streamlining. | |
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144 | </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> |
145 | Debug mode for <code class="filename"><unordered_map></code> and <code class="filename"><unordered_set></code>. | |
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146 | </p><p> |
147 | Parallel mode first appears. | |
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148 | </p><p>Variadic template implementations of items in <code class="filename"><tuple></code> and |
149 | <code class="filename"><functional></code>. | |
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150 | </p><p>Default <code class="code">what</code> implementations give more elaborate |
151 | exception strings for <code class="code">bad_cast</code>, | |
152 | <code class="code">bad_typeid</code>, <code class="code">bad_exception</code>, and | |
153 | <code class="code">bad_alloc</code>. | |
154 | </p><p> | |
18246ced | 155 | PCH binary files no longer installed. Instead, the source files are installed. |
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156 | </p><p> |
157 | Namespace pb_ds moved to __gnu_pb_ds. | |
53b03cce | 158 | </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> |
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159 | </p><p> |
160 | C++0X features. | |
53b03cce | 161 | </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> |
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162 | Added. |
163 | </p><p> | |
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164 | <code class="filename"><atomic></code>, |
165 | <code class="filename"><chrono></code>, | |
166 | <code class="filename"><condition_variable></code>, | |
167 | <code class="filename"><forward_list></code>, | |
168 | <code class="filename"><initializer_list></code>, | |
169 | <code class="filename"><mutex></code>, | |
170 | <code class="filename"><ratio></code>, | |
171 | <code class="filename"><thread></code> | |
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172 | </p></li><li class="listitem"><p> |
173 | Updated and improved. | |
174 | </p><p> | |
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175 | <code class="filename"><algorithm></code>, |
176 | <code class="filename"><system_error></code>, | |
177 | <code class="filename"><type_traits></code> | |
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178 | </p></li><li class="listitem"><p> |
179 | Use of the GNU extension namespace association converted to inline namespaces. | |
180 | </p></li><li class="listitem"><p> | |
181 | Preliminary support for <code class="classname">initializer_list</code> | |
182 | and defaulted and deleted constructors in container classes. | |
183 | </p></li><li class="listitem"><p> | |
184 | <code class="classname">unique_ptr</code>. | |
185 | </p></li><li class="listitem"><p> | |
186 | Support for new character types <span class="type">char16_t</span> | |
187 | and <span class="type">char32_t</span> added | |
188 | to <code class="classname">char_traits</code>, <code class="classname">basic_string</code>, <code class="classname">numeric_limits</code>, | |
189 | and assorted compile-time type traits. | |
190 | </p></li><li class="listitem"><p> | |
191 | Support for string conversions <code class="function">to_string</code> | |
192 | and <code class="function">to_wstring</code>. | |
193 | </p></li><li class="listitem"><p> | |
194 | Member functions taking string arguments were added to iostreams | |
195 | including <code class="classname">basic_filebuf</code>, <code class="classname">basic_ofstream</code>, | |
196 | and <code class="classname">basic_ifstream</code>. | |
197 | </p></li><li class="listitem"><p> | |
198 | Exception propagation support, | |
199 | including <code class="classname">exception_ptr</code>, <code class="function">current_exception</code>, <code class="function">copy_exception</code>, | |
200 | and <code class="function">rethrow_exception</code>. | |
201 | </p></li></ul></div><p> | |
202 | Uglification of <code class="literal">try</code> to <code class="literal">__try</code> | |
203 | and <code class="literal">catch</code> to <code class="literal">__catch</code>. | |
204 | </p><p> | |
a2edd3e9 | 205 | Audit of internal mutex usage, conversion to functions returning static |
4396e063 BK |
206 | local mutex. |
207 | </p><p> Extensions | |
cad3fc8c JW |
208 | added: <code class="filename"><ext/pointer.h></code> |
209 | and <code class="filename"><ext/extptr_allocator.h></code>. Support | |
4396e063 BK |
210 | for non-standard pointer types has been added |
211 | to <code class="classname">vector</code> | |
212 | and <code class="classname">forward_list</code>. | |
53b03cce | 213 | </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> |
4396e063 BK |
214 | </p><p> |
215 | C++0X features. | |
53b03cce | 216 | </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> |
4396e063 BK |
217 | Added. |
218 | </p><p> | |
cad3fc8c JW |
219 | <code class="filename"><functional></code>, |
220 | <code class="filename"><future></code>, | |
221 | <code class="filename"><random></code> | |
4396e063 BK |
222 | </p></li><li class="listitem"><p> |
223 | Updated and improved. | |
224 | </p><p> | |
cad3fc8c JW |
225 | <code class="filename"><atomic></code>, |
226 | <code class="filename"><system_error></code>, | |
227 | <code class="filename"><type_traits></code> | |
4396e063 BK |
228 | </p></li><li class="listitem"><p> |
229 | Add support for explicit operators and standard layout types. | |
230 | </p></li></ul></div><p> | |
231 | Profile mode first appears. | |
232 | </p><p> | |
18246ced | 233 | Support for decimal floating-point arithmetic, including <code class="classname">decimal32</code>, <code class="classname">decimal64</code>, and <code class="classname">decimal128</code>. |
4396e063 BK |
234 | </p><p> |
235 | Python pretty-printers are added for use with appropriately-advanced versions of <span class="command"><strong>gdb</strong></span>. | |
236 | </p><p> | |
040175d5 | 237 | Audit for application of function attributes nothrow, const, pure, and noreturn. |
a2edd3e9 BK |
238 | </p><p> |
239 | The default behavior for comparing typeinfo names changed, so | |
cad3fc8c | 240 | in <code class="filename"><typeinfo></code>, <code class="literal">__GXX_MERGED_TYPEINFO_NAMES</code> |
a2edd3e9 | 241 | now defaults to zero. |
cad3fc8c | 242 | </p><p> Extensions modified: <code class="filename"><ext/throw_allocator.h></code>. |
040175d5 JW |
243 | </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> |
244 | Use constexpr and nullptr where appropriate throughout the library. | |
245 | </p><p> | |
453e2916 | 246 | The library was updated to avoid including |
cad3fc8c | 247 | <code class="filename"><stddef.h></code> in order |
040175d5 JW |
248 | to reduce namespace pollution. |
249 | </p><p>Reference-count annotations to assist data race detectors. | |
250 | </p><p> | |
251 | Added <code class="function">make_exception_ptr</code> as an alias of | |
252 | <code class="function">copy_exception</code>. | |
253 | </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> | |
254 | <code class="classname">monotonic_clock</code> renamed to | |
255 | <code class="classname">steady_clock</code> as required by the final C++11 | |
256 | standard. | |
257 | </p><p>A new clocale model for newlib is available.</p><p> | |
453e2916 | 258 | The library was updated to avoid including |
cad3fc8c | 259 | <code class="filename"><unistd.h></code> in order |
040175d5 JW |
260 | to reduce namespace pollution. |
261 | </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> | |
262 | New random number engines and distributions. | |
263 | Optimisations for random. | |
264 | </p><p>New --enable-libstdcxx-verbose configure option</p><p> | |
265 | The --enable-libstdcxx-time configure option becomes unnecessary given a | |
266 | sufficiently recent glibc. | |
52556a87 | 267 | </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_51"></a><code class="constant">5</code></h3></div></div></div><p> |
040175d5 JW |
268 | ABI transition adds new implementations of several components, using the |
269 | <code class="code">abi_tag</code> attribute and the <code class="code">__cxx11</code> inline | |
270 | namespace to distinguish the new entities from the old ones. | |
271 | </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> | |
272 | Use of the new or old ABI can be selected per-translation unit with the | |
52556a87 | 273 | <a class="xref" href="using_macros.html" title="Macros">Macros</a>. |
040175d5 JW |
274 | </p></li><li class="listitem"><p> |
275 | New non-reference-counted <code class="classname">string</code> implementation. | |
276 | </p></li><li class="listitem"><p> | |
277 | New <code class="classname">list</code> implementation containing a new | |
278 | data member in order to provide O(1) <code class="function">size()</code>. | |
52556a87 JW |
279 | </p></li><li class="listitem"><p> |
280 | New <code class="classname">ios_base::failure</code> implementation inheriting | |
281 | from <code class="classname">system_error</code>. | |
040175d5 JW |
282 | </p></li></ul></div><p> |
283 | C++11 support completed (movable iostreams, new I/O manipulators, | |
284 | Unicode conversion utilities, atomic operations for | |
285 | <code class="classname">shared_ptr</code>, functions for notifying condition | |
286 | variables and making futures ready at thread exit). | |
287 | </p><p> | |
288 | Changed formatting of floating point types when | |
289 | <code class="code">ios_base::fixed|ios_base::scientific</code> is set in a stream's | |
290 | format flags. | |
291 | </p><p> Improved C++14 support and TS implementations. </p><p> New random number engines and distributions. </p><p> | |
292 | GDB Xmethods for containers and <code class="classname">unique_ptr</code> added. | |
293 | </p><p> | |
294 | <code class="classname">has_trivial_default_constructor</code>, | |
295 | <code class="classname">has_trivial_copy_constructor</code> and | |
296 | <code class="classname">has_trivial_copy_assign</code> deprecated. | |
52556a87 JW |
297 | </p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="api.rel_53"></a><code class="constant">5.3</code></h4></div></div></div><p> Experimental implementation of the C++ Filesystem TS added. </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_61"></a><code class="constant">6</code></h3></div></div></div><p> C++14 support completed. </p><p> |
298 | Support for mathematical special functions (ISO/IEC 29124:2010) added. | |
299 | </p><p> | |
300 | Assertions to check function preconditions can be enabled by defining the | |
a1ffe9b6 JW |
301 | <a class="link" href="using_macros.html" title="Macros"><span class="symbol">_GLIBCXX_ASSERTIONS</span> |
302 | macro</a>. | |
52556a87 JW |
303 | The initial set of assertions are a subset of the checks enabled by |
304 | the Debug Mode, but without the ABI changes and changes to algorithmic | |
305 | complexity that are caused by enabling the full Debug Mode. | |
306 | </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_71"></a><code class="constant">7</code></h3></div></div></div><p> | |
307 | The type of exception thrown by iostreams changed to the <code class="code">cxx11</code> | |
308 | ABI version of <code class="classname">std::ios_base::failure</code>. | |
309 | </p><p> | |
310 | Experimental C++17 support added, including most new library features. | |
311 | The meaning of <code class="classname">shared_ptr<T[]></code> changed to | |
312 | match the C++17 semantics. | |
313 | </p><p> | |
314 | <a class="xref" href="using_macros.html" title="Macros">Macros</a> added. | |
315 | </p><p> | |
316 | <code class="classname">has_trivial_default_constructor</code>, | |
317 | <code class="classname">has_trivial_copy_constructor</code> and | |
318 | <code class="classname">has_trivial_copy_assign</code> removed. | |
85adc2ec JW |
319 | </p><p> |
320 | Calling a <code class="code">std::bind</code> result as volatile was deprecated for C++17. | |
cad3fc8c JW |
321 | </p><p> Profile Mode was deprecated. </p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="api.rel_72"></a><code class="constant">7.2</code></h4></div></div></div><p> |
322 | Library Fundamentals TS header | |
323 | <code class="filename"><experimental/source_location></code> | |
324 | added. | |
325 | </p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="api.rel_73"></a><code class="constant">7.3</code></h4></div></div></div><p> | |
52556a87 JW |
326 | Including new C++14 or C++17 headers without a suitable <code class="option">-std</code> |
327 | no longer causes compilation to fail via <code class="literal">#error</code>. | |
328 | Instead the header is simply empty and doesn't define anything. | |
329 | </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_81"></a><code class="constant">8</code></h3></div></div></div><p> | |
330 | The exceptions thrown by iostreams can now be caught by handlers for either | |
331 | version of <code class="classname">std::ios_base::failure</code>. | |
332 | </p><p> | |
cad3fc8c JW |
333 | Improved experimental C++17 support. Headers |
334 | <code class="filename"><charconv></code> and | |
335 | <code class="filename"><filesystem></code>. | |
52556a87 | 336 | Experimental implementation of the C++17 Filesystem library added. |
cad3fc8c JW |
337 | </p><p> |
338 | Experimental C++2a support | |
339 | (<code class="function">to_address</code> and <code class="classname">endian</code>). | |
52556a87 JW |
340 | </p><p> |
341 | AddressSanitizer annotations added to <code class="classname">std::vector</code> | |
342 | to detect out-of-range accesses to the unused capacity of a vector. | |
343 | </p><p> | |
344 | <code class="function">std::char_traits<char16_t>::to_int_type(u'\uFFFF')</code> | |
345 | now returns <code class="literal">0xFFFD</code>, as <code class="literal">0xFFFF</code> is | |
346 | used for <code class="function">std::char_traits<char16_t>::eof()</code>. | |
347 | </p><p> | |
348 | The extension allowing arithmetic on | |
349 | <code class="classname">std::atomic<void*></code> and types like | |
350 | <code class="classname">std::atomic<R(*)()></code> was deprecated. | |
351 | </p><p> | |
352 | The <code class="function">std::uncaught_exception</code> function was deprecated | |
353 | for C++17 mode. | |
354 | </p><p> | |
355 | The nested typedefs <span class="type">std::hash::result_type</span> and | |
356 | <span class="type">std::hash::argument_type</span> were deprecated for C++17 mode. | |
357 | </p><p> | |
358 | The deprecated iostream members <span class="type">ios_base::io_state</span>, | |
359 | <span class="type">ios_base::open_mode</span>, <span class="type">ios_base::seek_dir</span>, and | |
360 | <code class="function">basic_streambuf::stossc</code> were removed for C++17 mode. | |
361 | </p><p> | |
362 | The non-standard C++0x <code class="function">std::copy_exception</code> function | |
363 | was removed. | |
364 | </p><p> | |
365 | For <code class="option">-std=c++11</code>, <code class="option">-std=c++14</code>, and | |
366 | <code class="option">-std=c++17</code> modes the <code class="filename"><complex.h></code> | |
367 | header no longer includes the C99 <code class="filename"><complex.h></code> | |
368 | header. | |
369 | </p><p> | |
370 | For the non-default <code class="option">--enable-symvers=gnu-versioned-namespace</code> | |
371 | configuration, the shared library SONAME has been changed to | |
372 | <code class="filename">libstdc++.so.8</code>. | |
cad3fc8c JW |
373 | </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_91"></a><code class="constant">9</code></h3></div></div></div><p> |
374 | C++17 header | |
375 | <code class="filename"><memory_resource></code> | |
376 | added. | |
377 | </p><p> | |
378 | Experimental C++2a support improved, with new headers | |
379 | <code class="filename"><bit></code> and | |
380 | <code class="filename"><version></code> added. | |
381 | Support for new character type <span class="type">char8_t</span> added | |
382 | to <code class="classname">char_traits</code>, <code class="classname">basic_string</code>, | |
383 | <code class="classname">numeric_limits</code>, | |
384 | and relevant locale facets and type traits. | |
385 | </p><p> | |
386 | Experimental implementation of the Networking TS library added, | |
387 | with new headers | |
388 | <code class="filename"><experimental/buffer></code>, | |
389 | <code class="filename"><experimental/executor></code>, | |
390 | <code class="filename"><experimental/internet></code>, | |
391 | <code class="filename"><experimental/io_context></code>, | |
392 | <code class="filename"><experimental/net></code>, | |
393 | <code class="filename"><experimental/netfwd></code>, | |
394 | <code class="filename"><experimental/socket></code>, | |
395 | and | |
396 | <code class="filename"><experimental/timer></code>. | |
544be2be JW |
397 | </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_101"></a><code class="constant">10</code></h3></div></div></div><p> Deprecated features removed: |
398 | </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> Profile Mode </li><li class="listitem"><code class="classname">__gnu_cxx::array_allocator</code></li></ul></div><p> | |
258059d9 JW |
399 | </p><p> |
400 | The non-standard <code class="function">std::__is_nullptr_t</code> type trait | |
401 | was deprecated. | |
fb3fc4bd JW |
402 | </p><p> |
403 | The <code class="classname">std::packaged_task</code> constructors taking | |
404 | an allocator argument are only defined for C++11 and C++14. | |
258059d9 JW |
405 | </p><p> |
406 | Several members of <code class="classname">std::allocator</code> were removed | |
407 | for C++20 mode. The removed functionality has been provided by | |
408 | <code class="classname">std::allocator_traits</code> since C++11 and that should | |
409 | be used instead. | |
3ef33e75 JW |
410 | </p><p> |
411 | The type of the <code class="classname">std::iterator</code> base class of | |
412 | <code class="classname">std::istreambuf_iterator</code> was changed to be | |
413 | consistent for all <code class="option">-std</code> modes. | |
414 | Before GCC 10.1 the base class had one type in C++98 mode and a | |
415 | different type in C++11 and later modes. The type in C++98 mode | |
416 | was changed to be the same as for C++11 and later. | |
0e0beddd JW |
417 | </p><p> |
418 | Experimental C++2a support improved, with new headers | |
419 | <code class="filename"><concepts></code>, | |
420 | <code class="filename"><ranges></code>, | |
421 | <code class="filename"><compare></code>, | |
422 | <code class="filename"><coroutine></code>, | |
423 | <code class="filename"><numbers></code>, | |
424 | <code class="filename"><span></code>, | |
425 | and | |
426 | <code class="filename"><stop_token></code> | |
427 | added. | |
428 | </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_111"></a><code class="constant">11</code></h3></div></div></div><p> | |
429 | The <code class="option">--enable-cheaders=c_std</code> configuration | |
430 | was deprecated. | |
431 | </p><p> | |
432 | When compiling as C++20, the <code class="function">operator>></code> overloads | |
433 | for extracting strings into character buffers only work with arrays, | |
434 | not raw pointers. | |
435 | </p><p> | |
436 | <code class="code">std::string::reserve(n)</code> will no longer reduce | |
437 | the string's capacity. | |
438 | Calling <code class="function">reserve()</code> with no arguments is equivalent | |
439 | to <code class="function">shrink_to_fit()</code>, but is deprecated. | |
440 | <code class="function">shrink_to_fit()</code> should be used instead. | |
7f2f4b87 JW |
441 | </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_121"></a><code class="constant">12</code></h3></div></div></div><p> |
442 | The <code class="function">std::random_shuffle</code> algorithms are deprecated | |
443 | for C++14 and later. The C++11 <code class="function">std::shuffle</code> algorithm | |
444 | can be used instead. | |
f4130a3e JW |
445 | </p><p> |
446 | The <code class="function">std::unexpected</code> function and related typedef and | |
447 | accessors for the unexpected handler are deprecated for C++11 and later. | |
448 | Dynamic exception specifications should be replaced with <code class="code">noexcept</code>. | |
e2e98f52 | 449 | </p><p> |
9c186493 JW |
450 | C++98 adaptable function utilities |
451 | (<code class="code">std::bind1st</code>, <code class="code">std::unary_function</code>, | |
452 | <code class="code">std::ptr_fun</code>, <code class="code">std::mem_fun_ref</code> etc.) | |
453 | were deprecated for C++11. | |
454 | <code class="code">std::iterator</code>, <code class="code">std::raw_storage_iterator</code>, | |
455 | <code class="code">get_temporary_buffer</code>, and <code class="code">std::not_fun</code> | |
456 | were deprecated for C++17. | |
457 | </p><p> | |
458 | Non-standard <code class="code">std::pair</code> constructors were deprecated. | |
12a88e6e JW |
459 | A non-standard default argument for |
460 | <code class="code">vector<bool>::insert(const_iterator, const bool&)</code> | |
461 | was deprecated. | |
9c186493 | 462 | </p><p> |
e2e98f52 JW |
463 | The <code class="literal">bitmap</code>, <code class="literal">mt</code>, and <code class="literal">pool</code> |
464 | options for <code class="option">--enable-libstdcxx-allocator</code> were removed. | |
fe9571a3 JW |
465 | For the <code class="literal">new</code> option, <code class="classname">std::allocator</code> |
466 | no longer derives from <code class="classname">__gnu_cxx::new_allocator</code>; | |
467 | they both derive from <code class="classname">std::__new_allocator</code> instead. | |
9e18a253 JW |
468 | </p><p> |
469 | <code class="function">std::condition_variable::wait</code> changed to be | |
470 | <code class="code">noexcept(false)</code> to allow thread cancellation exceptions to | |
471 | be thrown from <code class="function">pthread_cond_wait</code> without aborting | |
472 | the process. | |
85adc2ec JW |
473 | </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_123"></a><code class="constant">12.3</code></h3></div></div></div><p> |
474 | Calling a <code class="code">std::bind</code> result as volatile is ill-formed for C++20 | |
475 | and later. | |
53b03cce | 476 | </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> |