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<h1 class="centered"><a name="top">API Evolution and Deprecation History</a></h1>
<p class="fineprint"><em>
The latest version of this document is always available at
<a href="http://gcc.gnu.org/onlinedocs/libstdc++/17_intro/api.html">
http://gcc.gnu.org/onlinedocs/libstdc++/17_intro/api.html</a>.
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<hr />
<h3 class="left">
<a name="intro">API Evolution, Deprecation, and History of User Visible Changes</a>
</h3>
<p> A list of user-visible changes, by release version.
</p>
<h3 class="left">
<a name="3.0">3.0</a>
</h3>
<p>
Extensions moved to <code>include/ext</code>.
</p>
<p>
Include files from the SGI/HP sources that pre-date the ISO standard
are added. These files are placed into
the <code>include/backward</code> directory and a deprecated warning
is added that notifies on inclusion (<code>-Wno-deprecated</code>
deactivates the warning.)
</p>
<p>Deprecated include <backward/strstream> added.</p>
<p>Removal of include <builtinbuf.h>, <indstream.h>, <parsestream.h>, <PlotFile.h>, <SFile.h>, <stdiostream.h>, and <stream.h>.</p>
<h3 class="left">
<a name="3.1">3.1</a>
</h3>
<p>
Extensions from SGI/HP moved from <code>namespace std</code>
to <code>namespace __gnu_cxx</code>. As part of this, the following
new includes are
added: <ext/algorithm>, <ext/functional>, <ext/iterator>, <ext/memory>, and <ext/numeric>.
</p>
<p>
Extensions to <code>basic_filebuf</code> introduced: <code>__gnu_cxx::enc_filebuf</code>, and <code>__gnu_cxx::stdio_filebuf</code>.
</p>
<p>
Extensions to tree data structures added in <ext/rb_tree>.
</p>
<p>
Removal of <ext/tree>, moved to <backward/tree.h>.
</p>
<h3 class="left">
<a name="3.2">3.2</a>
</h3>
<p>Symbol versioning introduced for shared library.</p>
<p>Removal of include <backward/strstream.h>.</p>
<h3 class="left">
<a name="3.3">3.3</a>
</h3>
<p>Allocator changes. Change <code>__malloc_alloc</code> to <code>malloc_allocator</code> and <code>__new_alloc</code> to <code>new_allocator</code>. </p>
<p>Error handling in iostreams cleaned up, made consistent. </p>
<h3 class="left">
<a name="3.4">3.4</a>
</h3>
<p>
Large file support.
</p>
<p> Extensions for generic characters and <code>char_traits</code> added in <ext/pod_char_traits.h>.
</p>
<p>
Support for <code>wchar_t</code> specializations of <code>basic_filebuf</code> enhanced to support <code>UTF-8</code> and <code>Unicode</code>, depending on host. More hosts support basic <code>wchar_t</code> functionality.
</p>
<p>
Support for <code>char_traits</code> beyond builtin types.
</p>
<p>
Conformant <code>allocator</code> class and usage in containers. As
part of this, the following extensions are
added: <ext/bitmap_allocator.h>, <ext/debug_allocator.h>, <ext/mt_allocator.h>, <ext/malloc_allocator.h>,<ext/new_allocator.h>, <ext/pool_allocator.h>.
</p>
<p>
Debug mode first appears.
</p>
<p>
PCH support.
</p>
<p>
Macro guard for libstdc++ changed, from _GLIBCPP_ to _GLIBCXX_.
</p>
<p>
Extension <ext/stdio_sync_filebuf.h> added.
</p>
<p>
Extension <ext/demangle.h> added.
</p>
<h3 class="left">
<a name="4.0">4.0</a>
</h3>
<p>
TR1 features first appear.
</p>
<p>
Extension allocator <ext/array_allocator.h> added.
</p>
<p>
Extension <code>codecvt</code> specializations moved to <ext/codecvt_specializations.h>.
</p>
<p>
Removal of <ext/demangle.h>.
</p>
<h3 class="left">
<a name="4.1">4.1</a>
</h3>
<p>
Removal of <cassert> from all standard headers: now has to be explicitly included for <code>std::assert</code> calls.
</p>
<p> Extensions for policy-based data structures first added. New includes,
types, namespace <code>pb_assoc</code>.
</p>
<p> Extensions for typelists added in <ext/typelist.h>.
</p>
<p> Extension for policy-based <code>basic_string</code> first added: <code>__gnu_cxx::__versa_string</code> in <ext/vstring.h>.
</p>
<h3 class="left">
<a name="4.2">4.2</a>
</h3>
<p> Default visibility attributes applied to <code>namespace std</code>. Support for <code>-fvisibility</code>.
</p>
<p>TR1 <random>, <complex>, and C compatibility headers added.</p>
<p> Extensions for concurrent programming consolidated
into <ext/concurrence.h> and <ext/atomicity.h>,
including change of namespace to <code>__gnu_cxx</code> in some
cases. Added types
include <code>_Lock_policy</code>, <code>__concurrence_lock_error</code>, <code>__concurrence_unlock_error</code>, <code>__mutex</code>, <code>__scoped_lock</code>.</p>
<p> Extensions for type traits consolidated
into <ext/type_traits.h>. Additional traits are added
(<code>__conditional_type</code>, <code>__enable_if</code>, others.)
</p>
<p> Extensions for policy-based data structures revised. New includes,
types, namespace moved to <code>__pb_ds</code>.
</p>
<p> Extensions for debug mode modified: now nested in <code>namespace
std::__debug</code> and extensions in <code>namespace
__gnu_cxx::__debug</code>.</p>
<p> Extensions added: <ext/typelist.h>
and <ext/throw_allocator.h>.
</p>
<h3 class="left">
<a name="4.3">4.3</a>
</h3>
<p>
C++0X features first appear.
</p>
<p>TR1 <regex> and <cmath>'s mathematical special function added.</p>
<p>
Backward include edit.
</p>
<ul>
<li> Removed: <algobase.h> <algo.h> <alloc.h> <bvector.h> <complex.h>
defalloc.h> <deque.h> <fstream.h> <function.h> <hash_map.h> <hash_set.h>
hashtable.h> <heap.h> <iomanip.h> <iostream.h> <istream.h> <iterator.h>
list.h> <map.h> <multimap.h> <multiset.h> <new.h> <ostream.h> <pair.h> <queue.h>
rope.h> <set.h> <slist.h> <stack.h> <streambuf.h> <stream.h> <tempbuf.h>
<tree.h> <vector.h>
</li>
<li> Added: <hash_map> and <hash_set></li>
<li> Added in C++0x: <auto_ptr.h> and <binders.h></li>
</ul>
<p>
Header dependency streamlining.
</p>
<ul>
<li><algorithm> no longer includes <climits>, <cstring>, or <iosfwd> </li>
<li><bitset> no longer includes <istream> or <ostream>, adds <iosfwd> </li>
<li><functional> no longer includes <cstddef></li>
<li><iomanip> no longer includes <istream>, <istream>, or <functional>, adds <ioswd> </li>
<li><numeric> no longer includes <iterator></li>
<li><string> no longer includes <algorithm> or <memory></li>
<li><valarray> no longer includes <numeric> or <cstdlib></li>
<li><tr1/hashtable> no longer includes <memory> or <functional></li>
<li><tr1/memory> no longer includes <algorithm></li>
<li><tr1/random> no longer includes <algorithm> or <fstream></li>
</ul>
<p>
Debug mode for <unordered_map> and <unordered_set>.
</p>
<p>
Parallel mode first appears.
</p>
<p>Variadic template implementations of items in <tuple> and
<functional>.
</p>
<p>Default <code>what</code> implementations give more elaborate
exception strings for <code>bad_cast</code>,
<code>bad_typeid</code>, <code>bad_exception</code>, and
<code>bad_alloc</code>.
</p>
<p>
PCH binary files no longer installed. Instead, the source files are installed.
</p>
<p>
Namespace pb_ds moved to __gnu_pb_ds.
</p>
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