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<h1 class="topictitle1">Namespaces</h1>
<div>
<p>This section describes the library's namespace conventions.
</p>
<div class="section"><h2 class="sectiontitle"><samp class="codeph">tbb</samp> Namespace</h2>
<p>Namespace
<samp class="codeph">tbb</samp> contains public identifiers defined by the library
that you can reference in your program.
</p>
</div>
<div class="section"><h2 class="sectiontitle"><samp class="codeph">tbb::flow</samp>
Namespace</h2>
<p>Namespace
<samp class="codeph">tbb::flow</samp> contains public identifiers defined by the
library that you can reference in your program.
</p>
<p> related to the flow graph Community Preview Feature. See
<a href="../flow_graph.htm#flow_graph">Flow Graph</a> for more information .
</p>
</div>
<div class="section"><h2 class="sectiontitle"><samp class="codeph">tbb::interface<em>x</em></samp>
Namespace</h2>
<p>Namespaces of the form
<samp class="codeph">tbb::interface<em>x</em></samp> define public identifiers that
the library injects into namespace
<samp class="codeph">tbb</samp>. The numeral
<samp class="codeph"><em>x</em></samp> corresponds to an internal version number
that serves to prevent accidental linkage of incompatible definitions. Your
code should never directly reference namespaces prefixed with
<samp class="codeph">tbb::interface<em>x</em></samp>. Instead, reference names via
namespace
<samp class="codeph">tbb</samp>.
</p>
<p>For example the header
<samp class="codeph">tbb/concurrent_hash_map.h</samp> defines the template
<samp class="codeph">concurrent_hashmap<Key,T></samp> as
<samp class="codeph">tbb::version4::concurrent_hashmap<Key,T></samp> and
employs a
<samp class="codeph">using</samp> directive to inject it into namespace
<samp class="codeph">tbb</samp>. Your source code should reference it as
<samp class="codeph">tbb::concurrent_hashmap<Key,T></samp>.
</p>
</div>
<div class="section"><h2 class="sectiontitle"><samp class="codeph">tbb::internal</samp>
Namespace</h2>
<p>Namespace
<samp class="codeph">tbb::internal</samp> serves a role similar to
<samp class="codeph">tbb::interface<em>x</em></samp>. It is retained for backwards
compatibility with older versions of the library. Your code should never
directly reference namespace
<samp class="codeph">tbb::internal</samp>. Indirect reference via a public
<samp class="codeph">typedef</samp> provided by the header files is permitted.
</p>
</div>
<div class="section"><h2 class="sectiontitle"><samp class="codeph">tbb::deprecated</samp>
Namespace</h2>
<p>The library uses the namespace
<samp class="codeph">tbb::deprecated</samp> for deprecated identifiers that have
different default meanings in namespace
<samp class="codeph">tbb</samp>. Compiling with
<samp class="codeph">TBB_DEPRECATED=1</samp> causes such identifiers to replace
their counterpart in namespace tbb.
</p>
<p>For example,
<samp class="codeph">tbb::concurrent_queue</samp> underwent changes in
Intel® Threading Building Blocks (Intel® TBB) 2.2
that split its functionality into
<samp class="codeph">tbb::concurrent_queue</samp> and
<samp class="codeph">tbb::concurrent_bounded_queue</samp> and changed the name of
some methods. For sake of legacy code, the old Intel® TBB 2.1
functionality is retained in
<samp class="codeph">tbb::deprecated::concurrent_queue</samp>, which is injected
into namespace tbb when compiled with
<samp class="codeph">TBB_DEPRECATED=1</samp>.
</p>
</div>
<div class="section"><h2 class="sectiontitle"><samp class="codeph">tbb::strict_ppl</samp>
Namespace</h2>
<p>The library uses the namespace
<samp class="codeph">tbb::strict_ppl</samp> for identifiers that are put in
namespace
<samp class="codeph">Concurrency</samp> when<samp class="codeph"> tbb/compat/ppl.h</samp> is
included.
</p>
</div>
<div class="section"><h2 class="sectiontitle"><samp class="codeph">std</samp> Namespace</h2>
<p>The library implements some C++11 features in
namespace
<samp class="codeph">std</samp>. The library version can be used by including the
corresponding header in the following table.
</p>
<div class="tablenoborder"><a name="tbl3"><!-- --></a><table cellpadding="4" summary="" id="tbl3" width="100%" frame="hsides" border="1" rules="all"><caption><span class="tablecap">C++11 Features Optonally Defined
by Intel® TBB.</span></caption>
<thead align="left">
<tr>
<th class="cellrowborder" valign="top" width="NaN%" id="d89183e256">
<p><strong>Header</strong>
</p>
</th>
<th class="cellrowborder" valign="top" width="NaN%" id="d89183e264">
<p><strong>Identifiers Added to
<samp class="codeph">std::</samp></strong>
</p>
</th>
<th class="row-nocellborder" valign="top" width="NaN%" id="d89183e274">
<p><strong>Section</strong>
</p>
</th>
</tr>
</thead>
<tbody>
<tr>
<td class="cellrowborder" valign="top" width="NaN%" headers="d89183e256 ">
<p>tbb/compat/condition_variable
</p>
</td>
<td class="cellrowborder" valign="top" width="NaN%" headers="d89183e264 ">
<p><samp class="codeph">defer_lock_t</samp>
</p>
<p><samp class="codeph">try_to_lock_t</samp>
</p>
<p><samp class="codeph">adopt_lock_t</samp>
</p>
<p><samp class="codeph">defer_lock</samp>
</p>
<p><samp class="codeph">try_to_lock</samp>
</p>
<p><samp class="codeph">adopt_lock</samp>
</p>
<p><samp class="codeph">lock_guard</samp>
</p>
<p><samp class="codeph">unique_lock</samp>
</p>
<p><samp class="codeph">swap</samp>
</p>
<p><samp class="codeph">condition_variable</samp>
</p>
<p><samp class="codeph">cv_status</samp>
</p>
<p><samp class="codeph">timeout</samp>
</p>
<p><samp class="codeph">no_timeout</samp>
</p>
</td>
<td class="row-nocellborder" valign="top" width="NaN%" headers="d89183e274 ">
<p><a href="../synchronization/c_11_synchronization.htm">C++11
Synchronization</a>
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="NaN%" headers="d89183e256 ">
<p>tbb/compat/thread
</p>
</td>
<td class="cellrowborder" valign="top" width="NaN%" headers="d89183e264 ">
<p><samp class="codeph">thread</samp>
</p>
<p><samp class="codeph">this_thread</samp>
</p>
</td>
<td class="row-nocellborder" valign="top" width="NaN%" headers="d89183e274 ">
<p>
<a href="../threads/thread_cls.htm"><samp class="codeph">thread</samp>
Class</a>
</p>
</td>
</tr>
</tbody>
</table>
</div>
<p>To prevent accidental linkage with other
implementations of these C++ library features, the library defines the
identifiers in other namespaces and injects them into namespace
<samp class="codeph">std::</samp>. This way the “mangled
name” seen by the linker will differ from the “mangled
name” generated by other implementations.
</p>
</div>
</div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="../../reference/general_conventions.htm">General Conventions</a></div>
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