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<p>Last updated: $Date$</p>
<p>Clang fully implements all published ISO C++ standards (<a
href="#cxx98">C++98 / C++03</a>, <a
href="#cxx11">C++11</a>, and <a
href="#cxx14">C++14</a>), and most of the upcoming <a
href="#cxx17">C++17</a> standard.
<p>The Clang community is continually striving to improve C++ standards
compliance between releases by submitting and tracking <a
href="cxx_dr_status.html">C++ Defect Reports</a> and implementing resolutions
as they become available.</p>
<p>Experimental work is also under way to implement <a href="#ts">C++ Technical
Specifications</a> that will help drive the future of the C++ programming
language.</p>
<p>The <a href="http://llvm.org/bugs/">LLVM bug tracker</a> contains Clang
C++ components that track known bugs with Clang's language conformance in
each language mode.</p>
<h2 id="cxx98">C++98 implementation status</h2>
<p>Clang implements all of the ISO C++ 1998 standard
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(including the defects addressed in the ISO C++ 2003 standard)
except for <tt>export</tt> (which was removed in C++11).
<h2 id="cxx11">C++11 implementation status</h2>
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<p>Clang 3.3 and later implement all of the <a
href="http://www.iso.org/iso/catalogue_detail.htm?csnumber=50372">ISO
C++ 2011 standard</a>.
<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++.
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<details>
<summary>List of features and minimum Clang version with support</summary>
<table width="689" border="1" cellspacing="0">
<th>C++11 Proposal</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> 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>
</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>
</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> 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> 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> 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> 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><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>
<td> 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>Standardized attribute syntax</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2761.pdf">N2761</a></td>
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<td class="full" 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>
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<td class="full" align="center">Clang 3.3</td>
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<tr>
<td>Conditionally-support behavior</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1627.pdf">N1627</a></td>
<td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
<td>Changing undefined behavior into diagnosable errors</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1727.pdf">N1727</a></td>
<td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
<td>Delegating constructors</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf">N1986</a></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>
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<td class="full" 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>
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<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 <a href="#n2670">(2)</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 class="separator">
</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>
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<td class="full" 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">(3)</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>
<td>Memory model</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2429.htm">N2429</a></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">(4)</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>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>
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<td class="full" align="center">Clang 3.3 <a href="#n2659">(5)</a></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>
<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>
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<td class="na" align="center">N/A <a href="#n1988">(6)</a></td>
<p>
<span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute
<span id="n2670">(2): No compiler changes are required for an implementation
such as Clang that does not provide garbage collection.</span><br>
<span id="n2748">(3): All compare-exchange operations are emitted as
strong compare-exchanges.</span><br>
<span id="n2664">(4): <code>memory_order_consume</code> is lowered to
<code>memory_order_acquire</code>.</span><br>
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<span id="n2659">(5): <code>thread_local</code> support
requires a C++ runtime library providing <code>__cxa_thread_atexit</code>, such
as <a href="http://libcxxabi.llvm.org">libc++abi</a> 3.6 or later,
or libsupc++ 4.8 or later.</span><br>
<span id="n1988">(6): No compiler changes are required for an implementation
such as Clang that does not provide any extended integer types.
<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>
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</details>
<h2 id="cxx14">C++14 implementation status</h2>
<p>Clang 3.4 and later implement all of the <a
href="http://www.iso.org/iso/catalogue_detail.htm?csnumber=64029">ISO
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C++ 2014 standard</a>.
<p>You can use Clang in C++14 mode with the <code>-std=c++14</code> option
(use <code>-std=c++1y</code> in Clang 3.4 and earlier).</p>
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<details>
<summary>List of features and minimum Clang version with support</summary>
<table width="689" border="1" cellspacing="0">
<tr>
<th>Language Feature</th>
<th>C++14 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="full" align="center">Clang 3.4</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">Clang 2.9</td>
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<td rowspan=2 style="vertical-align:middle"><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3638.html">N3638</a></td>
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<td class="full" align="center">Clang 3.3</td>
<td>Return type deduction for normal functions</td>
<td class="full" align="center">Clang 3.4</td>
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<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3648.html">N3648</a></td>
<td class="full" align="center">Clang 3.4</td>
<td>Generic lambdas</td>
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<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3649.html">N3649</a></td>
<td class="full" align="center">Clang 3.4</td>
<td>Variable templates</td>
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<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3651.pdf">N3651</a></td>
<td class="full" align="center">Clang 3.4</td>
<td>Relaxing requirements on constexpr functions</td>
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<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3652.html">N3652</a></td>
<td class="full" align="center">Clang 3.4</td>
<td>Member initializers and aggregates</td>
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<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3653.html">N3653</a></td>
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<td class="full" align="center">Clang 3.3</td>
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<td>Clarifying memory allocation</td>
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<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3664.html">N3664</a></td>
<td class="full" align="center">Clang 3.4</td>
<tr>
<td><tt>[[deprecated]]</tt> attribute</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3760.html">N3760</a></td>
<td class="full" align="center">Clang 3.4</td>
</tr>
<tr>
<td>Single quotation mark as digit separator</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3781.pdf">N3781</a></td>
<td class="full" align="center">Clang 3.4</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3778.html">N3778</a></td>
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<td class="full" align="center">Clang 3.4 <a href="#n3778">(7)</a></td>
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<p>
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<span id="n3778">(7): In Clang 3.7 and later, sized deallocation is only enabled
if the user passes the <code>-fsized-deallocation</code> flag. The user must
supply definitions of the sized deallocation functions, either by providing them
explicitly or by using a C++ standard library that does. <code>libstdc++</code>
added these functions in version 5.0, and <code>libc++</code> added them in
version 3.7.
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</span>
</p>
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</details>
<h2 id="cxx17">C++17 implementation status</h2>
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<p>Clang 5 and later implement all the features
of the C++ 2017 Draft International Standard.
<p>You can use Clang in C++17 mode with the <code>-std=c++1z</code> option.</p>
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<details open>
<summary>List of features and minimum Clang version with support</summary>
<table width="689" border="1" cellspacing="0">
<tr>
<th>Language Feature</th>
<th>Available in Clang?</th>
</tr>
<!-- Issaquah 2014 papers -->
<tr>
<td><tt>static_assert</tt> with no message</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3928.pdf">N3928</a></td>
<td class="full" align="center">Clang 3.5</td>
<tr>
<td>Disabling trigraph expansion by default</td>
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<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4086.html">N4086</a></td>
<td class="full" align="center">Clang 3.5</td>
<!--
<td rowspan="2">Terse range-based for loops (removed from C++17)</td>
<td rowspan="2"><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3994.htm">N3994</a></td>
<td class="none" align="center">Clang 3.5: Yes</td>
</tr>
<tr>
<td class="svn" align="center">SVN: No</td>
-->
<tr>
<td><tt>typename</tt> in a template template parameter</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4051.html">N4051</a></td>
<td class="full" align="center">Clang 3.5</td>
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<tr>
<td>New <tt>auto</tt> rules for direct-list-initialization
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3922.html">N3922</a></td>
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<td class="full" align="center">Clang 3.8 <a href="#n3922">(8)</a></td>
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</tr>
<td rowspan="2">Fold expressions</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4295.html">N4295</a></td>
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<td class="full" align="center">Clang 3.6</td>
<tr> <!-- from Jacksonville -->
<td><a href="http://wg21.link/p0036r0">P0036R0</a></td>
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<td class="full" align="center">Clang 3.9</td>
</tr>
<tr>
<td><tt>u8</tt> character literals</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4267.html">N4267</a></td>
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<td class="full" align="center">Clang 3.6</td>
<tr>
<td>Nested namespace definition</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4230.html">N4230</a></td>
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<td class="full" align="center">Clang 3.6</td>
<tr>
<td>Attributes for namespaces and enumerators</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4266.html">N4266</a></td>
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<td class="full" align="center">Clang 3.6</td>
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<tr>
<td>Allow constant evaluation for all non-type template arguments</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4268.html">N4268</a></td>
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<td class="full" align="center">Clang 3.6</td>
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</tr>
<!-- Kona papers -->
<tr>
<td>Remove deprecated <tt>register</tt> storage class</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0001r1.html">P0001R1</a></td>
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<td class="full" align="center">Clang 3.8</td>
</tr>
<tr>
<td>Remove deprecated <tt>bool</tt> increment</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0002r1.html">P0002R1</a></td>
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<td class="full" align="center">Clang 3.8</td>
</tr>
<tr>
<td>Make exception specifications part of the type system</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0012r1.html">P0012R1</a></td>
<td class="full" align="center">Clang 4</td>
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<td><tt>__has_include</tt> in preprocessor conditionals</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0061.html">P0061R1</a></td>
<td class="full" align="center">Yes</td>
</tr>
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<tr>
<td>New specification for inheriting constructors (<a href="cxx_dr_status.html#1941">DR1941</a> et al)</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0136r1.html">P0136R1</a></td>
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<td class="full" align="center">Clang 3.9 <a href="#p0136">(9)</a></td>
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</tr>
<!-- Jacksonville papers -->
<tr>
<td><tt>[[fallthrough]]</tt> attribute</td>
<td><a href="http://wg21.link/p0188r1">P0188R1</a></td>
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<td class="full" align="center">Clang 3.9</td>
</tr>
<tr>
<td><tt>[[nodiscard]]</tt> attribute</td>
<td><a href="http://wg21.link/p0189r1">P0189R1</a></td>
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<td class="full" align="center">Clang 3.9</td>
</tr>
<tr>
<td><tt>[[maybe_unused]]</tt> attribute</td>
<td><a href="http://wg21.link/p0212r1">P0212R1</a></td>
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<td class="full" align="center">Clang 3.9</td>
</tr>
<tr>
<td>Aggregate initialization of classes with base classes</td>
<td><a href="http://wg21.link/p0017r1">P0017R1</a></td>
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<td class="full" align="center">Clang 3.9</td>
</tr>
<tr>
<td><tt>constexpr</tt> lambda expressions</td>
<td><a href="http://wg21.link/p0170r1">P0170R1</a></td>
<td class="svn" align="center">Clang 5</td>
</tr>
<tr>
<td>Differing <tt>begin</tt> and <tt>end</tt> types in range-based <tt>for</tt></td>
<td><a href="http://wg21.link/p0184r0">P0184R0</a></td>
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<td class="full" align="center">Clang 3.9</td>
</tr>
<tr>
<td>Lambda capture of <tt>*this</tt></td>
<td><a href="http://wg21.link/p0018r3">P0018R3</a></td>
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<td class="full" align="center">Clang 3.9</td>
</tr>
<tr>
<td>Direct-list-initialization of <tt>enum</tt>s</td>
<td><a href="http://wg21.link/p0138r2">P0138R2</a></td>
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<td class="full" align="center">Clang 3.9</td>
</tr>
<tr>
<td>Hexadecimal floating-point literals</td>
<td><a href="http://wg21.link/p0245r1">P0245R1</a></td>
<td class="full" align="center">Yes</td>
</tr>
<!-- Oulu papers -->
<tr>
<td>Using attribute namespaces without repetition</td>
<td><a href="http://wg21.link/p0028r4">P0028R4</a></td>
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<td class="full" align="center">Clang 3.9</td>
</tr>
<tr>
<td>Dynamic memory allocation for over-aligned data</td>
<td><a href="http://wg21.link/p0035r4">P0035R4</a></td>
<td class="full" align="center">Clang 4</td>
</tr>
<tr>
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<td rowspan="2">Template argument deduction for class templates</td>
<td><a href="http://wg21.link/p0091r3">P0091R3</a></td>
<td rowspan="2" class="svn" align="center">Clang 5</td>
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<tr> <!-- from Issaquah -->
<td><a href="http://wg21.link/p0512r0">P0512R0</a></td>
</tr>
<td>Non-type template parameters with <tt>auto</tt> type</td>
<td><a href="http://wg21.link/p0127r2">P0127R2</a></td>
<td class="full" align="center">Clang 4</td>
</tr>
<tr>
<td>Guaranteed copy elision</td>
<td><a href="http://wg21.link/p0135r1">P0135R1</a></td>
<td class="full" align="center">Clang 4</td>
</tr>
<tr>
<td rowspan=2>Stricter expression evaluation order</td>
<td><a href="http://wg21.link/p0145r3">P0145R3</a></td>
<td class="full" align="center" rowspan=2>Clang 4 <a href="#p0145">(10)</a></td>
</tr>
<tr>
<td><a href="http://wg21.link/p0400r0">P0400R0</a></td>
</tr>
<tr>
<td>Requirement to ignore unknown attributes</td>
<td><a href="http://wg21.link/p0283r2">P0283R2</a></td>
<td class="full" align="center">Yes</td>
</tr>
<tr>
<td><tt>constexpr</tt> <em>if-statement</em>s</td>
<td><a href="http://wg21.link/p0292r2">P0292R2</a></td>
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<td class="full" align="center">Clang 3.9</td>
<tr>
<td>Inline variables</td>
<td><a href="http://wg21.link/p0386r2">P0386R2</a></td>
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<td class="full" align="center">Clang 3.9</td>
</tr>
<tr>
<td>Structured bindings</td>
<td><a href="http://wg21.link/p0217r3">P0217R3</a></td>
<td class="full" align="center">Clang 4</td>
</tr>
<tr>
<td>Separate variable and condition for <tt>if</tt> and <tt>switch</tt></td>
<td><a href="http://wg21.link/p0305r1">P0305R1</a></td>
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<td class="full" align="center">Clang 3.9</td>
<!-- Issaquah 2016 papers -->
<tr>
<td>Matching template template parameters to compatible arguments</td>
<td><a href="http://wg21.link/p0522r0">P0522R0</a></td>
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<td class="partial" align="center">Partial <a href="#p0522">(12)</a></td>
</tr>
<tr>
<td>Removing deprecated dynamic exception specifications</td>
<td><a href="http://wg21.link/p0003r5">P0003R5</a></td>
<td class="full" align="center">Clang 4</td>
</tr>
<tr>
<td>Pack expansions in <em>using-declarations</em></td>
<td><a href="http://wg21.link/p0195r2">P0195R2</a></td>
<td class="full" align="center">Clang 4</td>
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<p>
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<span id="n3922">(8): This is a backwards-incompatible change that is applied to
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all language versions that allow type deduction from <tt>auto</tt>
(per the request of the C++ committee).
In Clang 3.7, a warning is emitted for all cases that would change meaning.
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</span><br>
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<span id="p0136">(9): This is the resolution to a Defect Report, so is applied
to all language versions supporting inheriting constructors.
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</span><br>
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<span id="p0145">(10): Under the MS ABI, function parameters are destroyed from
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left to right in the callee. As a result, function parameters in calls to
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<tt>operator<<</tt>, <tt>operator>></tt>, <tt>operator->*</tt>,
<tt>operator&&</tt>, <tt>operator||</tt>, and <tt>operator,</tt>
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functions using expression syntax are no longer guaranteed to be destroyed in
reverse construction order in that ABI.
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<span id="p0522">(12): Despite being the the resolution to a Defect Report, this
feature is disabled by default in all language versions, and can be enabled
explicitly with the flag <tt>-frelaxed-template-template-args</tt> in Clang 4.
The change to the standard lacks a corresponding change for template partial
ordering, resulting in ambiguity errors for reasonable and previously-valid
code. This issue is expected to be rectified soon.
</span>
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</p>
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</details>
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<h2 id="cxx20">C++2a implementation status</h2>
<p>Clang does not yet support any of the proposed features of
<!--<p>Clang has <b>experimental</b> support for some proposed features of-->
the C++ standard following C++17, provisionally named C++2a.
Note that support for these features may change or be removed without notice,
as the draft C++2a standard evolves.
<!--<p>You can use Clang in C++2a mode with the <code>-std=c++2a</code> option.</p>-->
<details open>
<summary>List of features and minimum Clang version with support</summary>
<table width="689" border="1" cellspacing="0">
<tr>
<th>Language Feature</th>
<th>C++2a Proposal</th>
<th>Available in Clang?</th>
</tr>
<!-- Toronto 2017 papers -->
<tr>
<td>Default member initializers for bit-fields</td>
<td><a href="http://wg21.link/p0683r1">P0683R1</a></td>
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
<td class="none" align="center">No</td>
</tr>
<tr>
<td><tt>const&</tt>-qualified pointers to members</td>
<td><a href="http://wg21.link/p0704r1">P0704R1</a></td>
<td class="none" align="center">No</td>
</tr>
<tr>
<td>Allow <i>lambda-capture</i> <tt>[=, this]</tt></td>
<td><a href="http://wg21.link/p0409r2">P0409R2</a></td>
<td class="none" align="center">No</td>
</tr>
<tr>
<td><tt>__VA_OPT__</tt> for preprocessor comma elision</td>
<td><a href="http://wg21.link/p0306r4">P0306R4</a></td>
<td class="none" align="center">No</td>
</tr>
<tr>
<td>Designated initializers</td>
<td><a href="http://wg21.link/p0329r4">P0329R4</a></td>
<td class="partial" align="center">Partial (extension)</td>
</tr>
<tr>
<td><i>template-parameter-list</i> for generic lambdas</td>
<td><a href="http://wg21.link/p0428r2">P0428R2</a></td>
<td class="none" align="center">No</td>
</tr>
<tr>
<td>Initializer list constructors in class template argument deduction</td>
<td><a href="http://wg21.link/p0702r1">P0702R1</a></td>
<td class="none" align="center">No</td>
</tr>
<tr>
<td>Concepts</td>
<td><a href="http://wg21.link/p0734r0">P0734R0</a></td>
<td class="none" align="center">No</td>
</tr>
</table>
</details>
<h2 id="ts">Technical specifications and standing documents</h2>
<p>ISO C++ also publishes a number of documents describing additional language
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and library features that are not part of standard C++.</p>
<details open>
<summary>List of features and minimum Clang version with support</summary>
<table width="689" border="1" cellspacing="0">
<tr>
<th>Document</th>
<th>Latest draft</th>
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<th>Compiler flag</th>
<th>Available in Clang?</th>
</tr>
<tr>
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<td rowspan="3">SD-6: SG10 feature test recommendations</td>
<td rowspan="3"><a href="http://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6</a></td>
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<td rowspan="3">N/A</td>
<td class="full" align="center">
Clang 3.4 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3745">N3745</a>)</br>
</td>
</tr>
<tr>
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<td class="full" align="center">
Clang 3.6 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4200">N4200</a>)</a>
</td>
<tr>
<td class="full" align="center">
Clang 4 (<a href="http://wg21.link/p0096r3">P0096R3</a>)</a>
</td>
</tr>
<!-- FIXME: Implement latest recommendations.
<tr>
<td class="svn" align="center">
SVN (<a href="http://wg21.link/p0096r3">P0096R3</a>)</a>
</td>
</tr>
-->
<!-- No compiler support is known to be needed for:
* Concurrency TS
* Parallelism TS
* Ranges TS
* Networking TS
* File System TS
-->
<tr>
<td>[TS] Concepts</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0121r0.pdf">P0121R0</a></td>
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<td></td>
<td class="none" align="center">WIP</td>
</tr>
<tr>
<td>[DRAFT TS] Coroutines</td>
<td><a href="https://isocpp.org/files/papers/N4663.pdf">N4663</a></td>
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<td><tt>-fcoroutines-ts<br>-stdlib=libc++</tt></td>
<td class="svn" align="center">Clang 5</td>
<td>[TS] Library Fundamentals, Version 1 (invocation type traits)</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4480.html">N4480</a></td>
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<td>N/A</td>
<td class="none" align="center">No</td>
</tr>
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<tr>
<td>[DRAFT TS] Library Fundamentals, Version 2 (<tt>source_location</tt>)</td>
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<td><a href="http://wg21.link/n4600">N4600</a></td>
<td>N/A</td>
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<td class="none" align="center">No</td>
</tr>
<tr>
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<td>[DRAFT TS] Modules</td>
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<td><a href="http://wg21.link/n4667">N4667</a></td>
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<td><tt>-fmodules-ts</tt></td>
<td class="none" align="center">WIP</td>
</tr>
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<tr>
<td>[TS] Transactional Memory</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4514.pdf">N4514</a></td>
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<td></td>
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<td class="none" align="center">No</td>
</tr>
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</details>