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<!--*************************************************************************-->
<h1>C++98, C++11, and C++14 Support in Clang</h1>
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<p>Last updated: $Date$</p>

<h2 id="cxx98">C++98 implementation status</h2>

<p>Clang currently implements all of the ISO C++ 1998 standard
  (including the defects addressed in the ISO C++ 2003 standard)
  except for <tt>export</tt> (which has been removed in C++11)
  and is considered a production-quality C++ compiler.  The <a
   href="http://llvm.org/bugs/">LLVM bug tracker</a> contains a Clang
  C++ component that tracks known Clang C++ bugs.</p>

<h2 id="cxx11">C++11 implementation status</h2>

  <p>Clang implements all of the <a
    href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372">ISO
    C++ 2011 standard</a>. The following table describes the Clang version
  in which each feature became available.</p>

<p>By default, Clang builds C++ code according to the C++98 standard, with many
C++11 features accepted as extensions. You can use Clang in C++11 mode with the
<code>-std=c++11</code> option. Clang's C++11 mode can be used
with <a href="http://libcxx.llvm.org/">libc++</a> or with gcc's libstdc++, but
patches are needed to make <a href="libstdc++4.4-clang0x.patch">libstdc++-4.4</a>
work with Clang in C++11 mode. Patches are also needed to make
<a href="libstdc++4.6-clang11.patch">libstdc++-4.6</a>,
and <a href="libstdc++4.7-clang11.patch">libstdc++-4.7</a> work with Clang
releases prior to version 3.2 in C++11 mode. <tt>thread_local</tt> support
currently requires g++-4.8's C++ runtime library.</p>

<table width="689" border="1" cellspacing="0">
 <tr>
    <th>Language Feature</th>
    <th>C++11 Proposal</th>
    <th>Available in Clang?</th>
 </tr>
     <tr>
      <td>Rvalue references</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2118.html">N2118</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;Rvalue references for <code>*this</code></td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2439.htm">N2439</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Initialization of class objects by rvalues</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1610.html">N1610</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Non-static data member initializers</td>
      <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2008/n2756.htm">N2756</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Variadic templates</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2242.pdf">N2242</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;Extending variadic template template parameters</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2555.pdf">N2555</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Initializer lists</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2672.htm">N2672</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Static assertions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.html">N1720</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td><code>auto</code>-typed variables</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf">N1984</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;Multi-declarator <code>auto</code></td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1737.pdf">N1737</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;Removal of auto as a storage-class specifier</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2546.htm">N2546</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;New function declarator syntax</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2541.htm">N2541</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Lambda expressions</td>
      <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2927.pdf">N2927</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Declared type of an expression</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;Incomplete return types</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3276.pdf">N3276</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Right angle brackets</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Default template arguments for function templates</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#226">DR226</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Solving the SFINAE problem for expressions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2634.html">DR339</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Alias templates</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf">N2258</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Extern templates</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1987.htm">N1987</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Null pointer constant</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Strongly-typed enums</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf">N2347</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Forward declarations for enums</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2764.pdf">N2764</a>
      <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1206">DR1206</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Generalized attributes</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2761.pdf">N2761</a></td>
      <td class="svn" align="center">Clang 3.3 <a href="#n2761">(1)</a></td>
    </tr>
    <tr>
      <td>Generalized constant expressions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf">N2235</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Alignment support</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf">N2341</a></td>
      <td class="svn" align="center">Clang 3.3</td>
    </tr>
    <!-- Skipped N1627: Conditionally-support behavior -->
    <!-- Skipped N1727: Changing Undefined Behavior into Diagnosable Errors -->
    <tr>
      <td>Delegating constructors</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf">N1986</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Inheriting constructors</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2540.htm">N2540</a></td>
      <td class="svn" align="center">Clang 3.3</td>
    </tr>
    <tr>
      <td>Explicit conversion operators</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>New character types</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2249.html">N2249</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Unicode string literals</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Raw string literals</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Universal character names in literals</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2170.html">N2170</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>User-defined literals</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2765.pdf">N2765</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Standard Layout Types</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2342.htm">N2342</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Defaulted functions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Deleted functions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Extended friend declarations</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1791.pdf">N1791</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Extending <code>sizeof</code></td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2253.html">N2253</a>
      <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#850">DR850</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Inline namespaces</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2535.htm">N2535</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Unrestricted unions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2544.pdf">N2544</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Local and unnamed types as template arguments</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm">N2657</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Range-based for</td>
      <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2930.html">N2930</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Explicit virtual overrides</td>
      <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2928.htm">N2928</a>
      <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3206.htm">N3206</a>
      <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3272.htm">N3272</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Minimal support for garbage collection and reachability-based leak detection</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2670.htm">N2670</a></td>
      <td class="na" align="center">N/A</td>
    </tr>
    <tr>
      <td>Allowing move constructors to throw [noexcept]</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3050.html">N3050</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Defining move special member functions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3053.html">N3053</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>

    <tr class="separator">
      <th align="center" colspan="3">Concurrency</th>
    </tr>
    <tr>
      <td>Sequence points</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2239.html">N2239</a></td>
      <td class="svn" align="center">Clang 3.3</td>
    </tr>
    <tr>
      <td>Atomic operations</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html">N2427</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Strong Compare and Exchange</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2748.html">N2748</a></td>
      <td class="full" align="center">Clang 3.1 <a href="#n2748">(2)</a></td>
    </tr>
    <tr>
      <td>Bidirectional Fences</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2752.htm">N2752</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>

    <tr>
      <td>Memory model</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2429.htm">N2429</a></td>
      <td class="full" align="center">Clang 3.2</td>
    </tr>
    <tr>
      <td>Data-dependency ordering: atomics and memory model</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2664.htm">N2664</a></td>
      <td class="full" align="center">Clang 3.2 <a href="#n2664">(3)</a></td>
    </tr>
    <tr>
      <td>Propagating exceptions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html">N2179</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Abandoning a process and at_quick_exit</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2440.htm">N2440</a></td>
      <td class="na" align="center">N/A</td>
    </tr>
    <tr>
      <td>Allow atomics use in signal handlers</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2547.htm">N2547</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Thread-local storage</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2659.htm">N2659</a></td>
      <td class="svn" align="center">Clang 3.3</td>
    </tr>
    <tr>
      <td>Dynamic initialization and destruction with concurrency</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">N2660</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>

    <tr class="separator">
      <th align="center" colspan="3">C99 Features in C++11</th>
    </tr>
    <tr>
      <td><code>__func__</code> predefined identifier</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2340.htm">N2340</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>C99 preprocessor</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1653.htm">N1653</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td><code>long long</code></td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1811.pdf">N1811</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Extended integral types</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1988.pdf">N1988</a></td>
      <td class="na" align="center">N/A <a href="#n1988">(4)</a></td>
    </tr>
</table>

<p>
<span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute
has no effect.</span><br>
<span id="n2748">(2): All compare-exchange operations are emitted as
strong compare-exchanges.</span><br>
<span id="n2664">(3): <code>memory_order_consume</code> is lowered to
<code>memory_order_acquire</code>.</span><br>
<span id="n1988">(4): <code>__int128</code> is not treated as an extended
integer type, because changing <code>intmax_t</code> would be an
ABI-incompatible change.</span>
</p>

<h2 id="cxx14">C++1y implementation status</h2>

<p>Clang is introducing support for the upcoming C++ language standard,
provisionally named C++1y.  The following table describes which C++1y features
have been implemented in Clang and in which Clang version they became
available.</p>

<p>You can use Clang in C++1y mode with the <code>-std=c++1y</code> option.</p>

<table width="689" border="1" cellspacing="0">
 <tr>
    <th>Language Feature</th>
    <th>C++1y Proposal</th>
    <th>Available in Clang?</th>
 </tr>
    <tr>
      <td>Tweak to certain C++ contextual conversions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3323.pdf">N3323</a></td>
      <td class="none" align="center">No</td>
    </tr>
    <tr>
      <td>Binary literals</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3472.pdf">N3472</a></td>
      <td class="full" align="center">Yes</td>
    </tr>
    <tr>
      <td>decltype(auto)</td>
      <td rowspan=2 style="vertical-align:middle"><a href="http://isocpp.org/files/papers/N3638.html">N3638</a></td>
      <td class="svn" align="center">Clang 3.3</td>
    </tr>
    <tr>
      <td>Return type deduction for normal functions</td>
      <td class="partial" align="center">Partial</td>
    </tr>
    <tr>
      <td>Runtime-sized arrays with automatic storage duration</td>
      <td><a href="http://isocpp.org/files/papers/N3639.html">N3639</a></td>
      <td class="partial" align="center">Partial</td>
    </tr>
    <tr>
      <td>Initialized lambda captures</td>
      <td><a href="http://isocpp.org/files/papers/N3648.html">N3648</a></td>
      <td class="none" align="center">No</td>
    </tr>
    <tr>
      <td>Generic lambdas</td>
      <td><a href="http://isocpp.org/files/papers/N3649.html">N3649</a></td>
      <td class="partial" align="center">
        No [<a href="https://github.com/faisalv/clang-glambda">WIP</a>]</td>
    </tr>
    <tr>
      <td>Variable templates</td>
      <td><a href="http://isocpp.org/files/papers/N3651.pdf">N3651</a></td>
      <td class="none" align="center">No</td>
    </tr>
    <tr>
      <td>Relaxing requirements on constexpr functions</td>
      <td><a href="http://isocpp.org/files/papers/N3652.html">N3652</a></td>
      <td class="partial" align="center">Partial</td>
    </tr>
    <tr>
      <td>Member initializers and aggregates</td>
      <td><a href="http://isocpp.org/files/papers/N3653.html">N3653</a></td>
      <td class="svn" align="center">Clang 3.3</td>
    </tr>
    <tr>
      <td>Clarifying memory allocation</td>
      <td><!--<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3664.html">-->N3664<!--</a>--></td>
      <td class="full" align="center">Yes</td>
    </tr>
</table>

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