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</th></tr><tr><td width=
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</a> </td><th width=
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4 Porting and Maintenance
6 </th><td width=
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</a></td></tr></table><hr /></div><div class=
"sect1" title=
"API Evolution and Deprecation History"><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>
7 A list of user-visible changes, in chronological order
8 </p><div class=
"sect2" title=
"3.0"><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>
9 Extensions moved to
<code class=
"filename">include/ext
</code>.
11 Include files from the SGI/HP sources that pre-date the ISO standard
12 are added. These files are placed into
13 the
<code class=
"filename">include/backward
</code> directory and a deprecated warning
14 is added that notifies on inclusion (
<code class=
"literal">-Wno-deprecated
</code>
15 deactivates the warning.)
16 </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>.
17 </p></div><div class=
"sect2" title=
"3.1"><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>
19 Extensions from SGI/HP moved from
<code class=
"code">namespace std
</code>
20 to
<code class=
"code">namespace __gnu_cxx
</code>. As part of this, the following
22 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>.
24 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>.
26 Extensions to tree data structures added in
<code class=
"filename">ext/rb_tree
</code>.
28 Removal of
<code class=
"filename">ext/tree
</code>, moved to
<code class=
"filename">backward/tree.h
</code>.
29 </p></div><div class=
"sect2" title=
"3.2"><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>
30 </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
31 <code class=
"literal">__USE_MALLOC
</code> on the gcc command line would change the
32 default allocation strategy to instead use
<code class=
"code"> malloc
</code> and
33 <code class=
"function">free
</code>. (This same functionality is now spelled
<code class=
"literal">_GLIBCXX_FORCE_NEW
</code>, see
34 <a class=
"link" href=
"using_macros.html" title=
"Macros">this page
</a>
36 </p><p>Error handling in iostreams cleaned up, made consistent.
</p></div><div class=
"sect2" title=
"3.3"><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>
37 </p></div><div class=
"sect2" title=
"3.4"><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> Extensions for generic characters and
<code class=
"code">char_traits
</code> added in
<code class=
"filename">ext/pod_char_traits.h
</code>.
42 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.
44 Support for
<code class=
"code">char_traits
</code> beyond builtin types.
46 Conformant
<code class=
"code">allocator
</code> class and usage in containers. As
47 part of this, the following extensions are
48 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>.
50 This is a change from all previous versions, and may require
51 source-level changes due to allocator-related changes to structures
52 names and template parameters, filenames, and file locations. Some,
53 like
<code class=
"code">__simple_alloc, __allocator, __alloc,
</code> and
<code class=
"code">
54 _Alloc_traits
</code> have been removed.
55 </p><p>Default behavior of
<code class=
"code">std::allocator
</code> has changed.
</p><p>
56 Previous versions prior to
3.4 cache allocations in a memory
57 pool, instead of passing through to call the global allocation
58 operators (i.e.,
<code class=
"classname">__gnu_cxx::pool_allocator
</code>). More
59 recent versions default to the
60 simpler
<code class=
"classname">__gnu_cxx::new_allocator
</code>.
61 </p><p> Previously, all allocators were written to the SGI
62 style, and all STL containers expected this interface. This
63 interface had a traits class called
<code class=
"code">_Alloc_traits
</code> that
64 attempted to provide more information for compile-time allocation
65 selection and optimization. This traits class had another allocator
66 wrapper,
<code class=
"code">__simple_alloc
<T,A
></code>, which was a
67 wrapper around another allocator, A, which itself is an allocator
68 for instances of T. But wait, there's more:
69 <code class=
"code">__allocator
<T,A
></code> is another adapter. Many of
70 the provided allocator classes were SGI style: such classes can be
71 changed to a conforming interface with this wrapper:
72 <code class=
"code">__allocator
<T, __alloc
></code> is thus the same as
73 <code class=
"code">allocator
<T
></code>.
74 </p><p> The class
<code class=
"classname">allocator
</code> used the typedef
75 <span class=
"type">__alloc
</span> to select an underlying allocator that
76 satisfied memory allocation requests. The selection of this
77 underlying allocator was not user-configurable.
78 </p><div class=
"table"><a id=
"id654608"></a><p class=
"title"><b>Table B
.1. Extension Allocators
</b></p><div class=
"table-contents"><table summary=
"Extension Allocators" border=
"1"><colgroup><col align=
"left" /><col align=
"left" /><col align=
"left" /><col align=
"left" /></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
79 of available allocators. All of these new allocators are
80 standard-style. The following table includes details, along with
81 the first released version of GCC that included the extension allocator.
82 </p><div class=
"table"><a id=
"id534867"></a><p class=
"title"><b>Table B
.2. Extension Allocators Continued
</b></p><div class=
"table-contents"><table summary=
"Extension Allocators Continued" border=
"1"><colgroup><col align=
"left" /><col align=
"left" /><col align=
"left" /></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>
83 Debug mode first appears.
85 Precompiled header support
<acronym class=
"acronym">PCH
</acronym> support.
87 Macro guard for changed, from
<code class=
"literal">_GLIBCPP_
</code> to
<code class=
"literal">_GLIBCXX_
</code>.
89 Extension
<code class=
"filename">ext/stdio_sync_filebuf.h
</code> added.
91 Extension
<code class=
"filename">ext/demangle.h
</code> added.
92 </p></div><div class=
"sect2" title=
"4.0"><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>
94 TR1 features first appear.
96 Extension allocator
<code class=
"filename">ext/array_allocator.h
</code> added.
98 Extension
<code class=
"code">codecvt
</code> specializations moved to
<code class=
"filename">ext/codecvt_specializations.h
</code>.
100 Removal of
<code class=
"filename">ext/demangle.h
</code>.
101 </p></div><div class=
"sect2" title=
"4.1"><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>
103 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.
104 </p><p> Extensions for policy-based data structures first added. New includes,
105 types, namespace
<code class=
"code">pb_assoc
</code>.
106 </p><p> Extensions for typelists added in
<code class=
"filename">ext/typelist.h
</code>.
107 </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>.
108 </p></div><div class=
"sect2" title=
"4.2"><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>
109 </p><p> Default visibility attributes applied to
<code class=
"code">namespace std
</code>. Support for
<code class=
"code">-fvisibility
</code>.
110 </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
111 into
<code class=
"filename">ext/concurrence.h
</code> and
<code class=
"filename">ext/atomicity.h
</code>,
112 including change of namespace to
<code class=
"code">__gnu_cxx
</code> in some
114 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
115 into
<code class=
"filename">ext/type_traits.h
</code>. Additional traits are added
116 (
<code class=
"code">__conditional_type
</code>,
<code class=
"code">__enable_if
</code>, others.)
117 </p><p> Extensions for policy-based data structures revised. New includes,
118 types, namespace moved to
<code class=
"code">__pb_ds
</code>.
119 </p><p> Extensions for debug mode modified: now nested in
<code class=
"code">namespace
120 std::__debug
</code> and extensions in
<code class=
"code">namespace
121 __gnu_cxx::__debug
</code>.
</p><p> Extensions added:
<code class=
"filename">ext/typelist.h
</code>
122 and
<code class=
"filename">ext/throw_allocator.h
</code>.
123 </p></div><div class=
"sect2" title=
"4.3"><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>
125 C++
0X features first appear.
126 </p><p>TR1
<code class=
"filename">regex
</code> and
<code class=
"filename">cmath
</code>'s mathematical special function added.
128 Backward include edit.
129 </p><div class=
"itemizedlist"><ul class=
"itemizedlist" type=
"disc"><li class=
"listitem"><p>Removed
</p><p>
130 <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>
131 <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>
132 <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>
133 <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>
134 <code class=
"filename">tree.h
</code> <code class=
"filename">vector.h
</code>
135 </p></li><li class=
"listitem"><p>Added
</p><p>
136 <code class=
"filename">hash_map
</code> and
<code class=
"filename">hash_set
</code>
137 </p></li><li class=
"listitem"><p>Added in C++
0x
</p><p>
138 <code class=
"filename">auto_ptr.h
</code> and
<code class=
"filename">binders.h
</code>
139 </p></li></ul></div><p>
140 Header dependency streamlining.
141 </p><div class=
"itemizedlist"><ul class=
"itemizedlist" 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>
142 Debug mode for
<code class=
"filename">unordered_map
</code> and
<code class=
"filename">unordered_set
</code>.
144 Parallel mode first appears.
145 </p><p>Variadic template implementations of items in
<code class=
"filename">tuple
</code> and
146 <code class=
"filename">functional
</code>.
147 </p><p>Default
<code class=
"code">what
</code> implementations give more elaborate
148 exception strings for
<code class=
"code">bad_cast
</code>,
149 <code class=
"code">bad_typeid
</code>,
<code class=
"code">bad_exception
</code>, and
150 <code class=
"code">bad_alloc
</code>.
152 PCH binary files no longer installed. Instead, the source files are installed.
154 Namespace pb_ds moved to __gnu_pb_ds.
155 </p></div><div class=
"sect2" title=
"4.4"><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><div class=
"itemizedlist"><ul class=
"itemizedlist" type=
"disc"><li class=
"listitem"><p>
161 <code class=
"filename">atomic
</code>,
162 <code class=
"filename">chrono
</code>,
163 <code class=
"filename">condition_variable
</code>,
164 <code class=
"filename">forward_list
</code>,
165 <code class=
"filename">initializer_list
</code>,
166 <code class=
"filename">mutex
</code>,
167 <code class=
"filename">ratio
</code>,
168 <code class=
"filename">thread
</code>
169 </p></li><li class=
"listitem"><p>
170 Updated and improved.
172 <code class=
"filename">algorithm
</code>,
173 <code class=
"filename">system_error
</code>,
174 <code class=
"filename">type_traits
</code>
175 </p></li><li class=
"listitem"><p>
176 Use of the GNU extension namespace association converted to inline namespaces.
177 </p></li><li class=
"listitem"><p>
178 Preliminary support for
<code class=
"classname">initializer_list
</code>
179 and defaulted and deleted constructors in container classes.
180 </p></li><li class=
"listitem"><p>
181 <code class=
"classname">unique_ptr
</code>.
182 </p></li><li class=
"listitem"><p>
183 Support for new character types
<span class=
"type">char16_t
</span>
184 and
<span class=
"type">char32_t
</span> added
185 to
<code class=
"classname">char_traits
</code>,
<code class=
"classname">basic_string
</code>,
<code class=
"classname">numeric_limits
</code>,
186 and assorted compile-time type traits.
187 </p></li><li class=
"listitem"><p>
188 Support for string conversions
<code class=
"function">to_string
</code>
189 and
<code class=
"function">to_wstring
</code>.
190 </p></li><li class=
"listitem"><p>
191 Member functions taking string arguments were added to iostreams
192 including
<code class=
"classname">basic_filebuf
</code>,
<code class=
"classname">basic_ofstream
</code>,
193 and
<code class=
"classname">basic_ifstream
</code>.
194 </p></li><li class=
"listitem"><p>
195 Exception propagation support,
196 including
<code class=
"classname">exception_ptr
</code>,
<code class=
"function">current_exception
</code>,
<code class=
"function">copy_exception
</code>,
197 and
<code class=
"function">rethrow_exception
</code>.
198 </p></li></ul></div><p>
199 Uglification of
<code class=
"literal">try
</code> to
<code class=
"literal">__try
</code>
200 and
<code class=
"literal">catch
</code> to
<code class=
"literal">__catch
</code>.
202 Audit of internal mutex usage, conversion to functions returning static
205 added:
<code class=
"filename">ext/pointer.h
</code>
206 and
<code class=
"filename">ext/extptr_allocator.h
</code>. Support
207 for non-standard pointer types has been added
208 to
<code class=
"classname">vector
</code>
209 and
<code class=
"classname">forward_list
</code>.
210 </p></div><div class=
"sect2" title=
"4.5"><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><div class=
"itemizedlist"><ul class=
"itemizedlist" type=
"disc"><li class=
"listitem"><p>
216 <code class=
"filename">functional
</code>,
217 <code class=
"filename">future
</code>,
218 <code class=
"filename">random
</code>
219 </p></li><li class=
"listitem"><p>
220 Updated and improved.
222 <code class=
"filename">atomic
</code>,
223 <code class=
"filename">system_error
</code>,
224 <code class=
"filename">type_traits
</code>
225 </p></li><li class=
"listitem"><p>
226 Add support for explicit operators and standard layout types.
227 </p></li></ul></div><p>
228 Profile mode first appears.
230 Support for decimal floating-point arithmetic, including
<code class=
"classname">decimal32
</code>,
<code class=
"classname">decimal64
</code>, and
<code class=
"classname">decimal128
</code>.
232 Python pretty-printers are added for use with appropriately-advanced versions of
<span class=
"command"><strong>gdb
</strong></span>.
234 Audit for application of function attributes notrow, const, pure, and noreturn.
236 The default behavior for comparing typeinfo names changed, so
237 in
<code class=
"filename">typeinfo
</code>,
<code class=
"literal">__GXX_MERGED_TYPEINFO_NAMES
</code>
238 now defaults to zero.
239 </p><p> Extensions modified:
<code class=
"filename">ext/throw_allocator.h
</code>.
240 </p></div></div><div class=
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