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  25 <!--*************************************************************************-->
  26 <h1>C++ Support in Clang</h1>
  27 <!--*************************************************************************-->
  28 <p>Last updated: $Date$</p>
  29
  30 <p>Clang fully implements all published ISO C++ standards including <a
  31 href="#cxx11">C++11</a>, as well as the upcoming <a
  32 href="#cxx14">C++14</a> standard, and some parts of the fledgling <a
  33 href="#cxx17">C++1z</a> standard,
  34 and is considered a production-quality C++ compiler.
  35
  36 <p>The Clang community is continually striving to improve C++ standards
  37 compliance between releases by submitting and tracking <a
  38 href="cxx_dr_status.html">C++ Defect Reports</a> and implementing resolutions
  39 as they become available.</p>
  40
  41 <p>Experimental work is also under way to implement <a href="#ts">C++ Technical
  42 Specifications</a> that will help drive the future of the C++ programming
  43 language.</p>
  44
  45 <p>The <a href="http://llvm.org/bugs/">LLVM bug tracker</a> contains Clang
  46 C++ components that track known bugs with Clang's language conformance in
  47 each language mode.</p>
  48
  49 <h2 id="cxx98">C++98 implementation status</h2>
  50
  51 <p>Clang implements all of the ISO C++ 1998 standard
  52   (including the defects addressed in the ISO C++ 2003 standard)
  53   except for <tt>export</tt> (which was removed in C++11).
  54
  55 <h2 id="cxx11">C++11 implementation status</h2>
  56
  57   <p>Clang 3.3 and later implement all of the <a
  58     href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372">ISO
  59     C++ 2011 standard</a>. The following table describes the Clang version
  60   in which each feature became available.</p>
  61
  62 <p>By default, Clang builds C++ code according to the C++98 standard, with many
  63 C++11 features accepted as extensions. You can use Clang in C++11 mode with the
  64 <code>-std=c++11</code> option. Clang's C++11 mode can be used
  65 with <a href="http://libcxx.llvm.org/">libc++</a> or with gcc's libstdc++, but
  66 patches are needed to make <a href="libstdc++4.4-clang0x.patch">libstdc++-4.4</a>
  67 work with Clang in C++11 mode. Patches are also needed to make
  68 <a href="libstdc++4.6-clang11.patch">libstdc++-4.6</a>
  69 and <a href="libstdc++4.7-clang11.patch">libstdc++-4.7</a> work with Clang
  70 releases prior to version 3.2 in C++11 mode. <tt>thread_local</tt> support
  71 currently requires the C++ runtime library from g++-4.8 or later.</p>
  72
  73 <table width="689" border="1" cellspacing="0">
  74  <tr>
  75     <th>Language Feature</th>
  76     <th>C++11 Proposal</th>
  77     <th>Available in Clang?</th>
  78  </tr>
  79      <tr>
  80       <td>Rvalue references</td>
  81       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2118.html">N2118</a></td>
  82       <td class="full" align="center">Clang 2.9</td>
  83     </tr>
  84     <tr>
  85       <td>&nbsp;&nbsp;&nbsp;&nbsp;Rvalue references for <code>*this</code></td>
  86       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2439.htm">N2439</a></td>
  87       <td class="full" align="center">Clang 2.9</td>
  88     </tr>
  89     <tr>
  90       <td>Initialization of class objects by rvalues</td>
  91       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1610.html">N1610</a></td>
  92       <td class="full" align="center">Clang 2.9</td>
  93     </tr>
  94     <tr>
  95       <td>Non-static data member initializers</td>
  96       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2008/n2756.htm">N2756</a></td>
  97       <td class="full" align="center">Clang 3.0</td>
  98     </tr>
  99     <tr>
 100       <td>Variadic templates</td>
 101       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2242.pdf">N2242</a></td>
 102       <td class="full" align="center">Clang 2.9</td>
 103     </tr>
 104     <tr>
 105       <td>&nbsp;&nbsp;&nbsp;&nbsp;Extending variadic template template parameters</td>
 106       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2555.pdf">N2555</a></td>
 107       <td class="full" align="center">Clang 2.9</td>
 108     </tr>
 109     <tr>
 110       <td>Initializer lists</td>
 111       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2672.htm">N2672</a></td>
 112       <td class="full" align="center">Clang 3.1</td>
 113     </tr>
 114     <tr>
 115       <td>Static assertions</td>
 116       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.html">N1720</a></td>
 117       <td class="full" align="center">Clang 2.9</td>
 118     </tr>
 119     <tr>
 120       <td><code>auto</code>-typed variables</td>
 121       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf">N1984</a></td>
 122       <td class="full" align="center">Clang 2.9</td>
 123     </tr>
 124     <tr>
 125       <td>&nbsp;&nbsp;&nbsp;&nbsp;Multi-declarator <code>auto</code></td>
 126       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1737.pdf">N1737</a></td>
 127       <td class="full" align="center">Clang 2.9</td>
 128     </tr>
 129     <tr>
 130       <td>&nbsp;&nbsp;&nbsp;&nbsp;Removal of auto as a storage-class specifier</td>
 131       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2546.htm">N2546</a></td>
 132       <td class="full" align="center">Clang 2.9</td>
 133     </tr>
 134     <tr>
 135       <td>&nbsp;&nbsp;&nbsp;&nbsp;New function declarator syntax</td>
 136       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2541.htm">N2541</a></td>
 137       <td class="full" align="center">Clang 2.9</td>
 138     </tr>
 139     <tr>
 140       <td>Lambda expressions</td>
 141       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2927.pdf">N2927</a></td>
 142       <td class="full" align="center">Clang 3.1</td>
 143     </tr>
 144     <tr>
 145       <td>Declared type of an expression</td>
 146       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a></td>
 147       <td class="full" align="center">Clang 2.9</td>
 148     </tr>
 149     <tr>
 150       <td>&nbsp;&nbsp;&nbsp;&nbsp;Incomplete return types</td>
 151       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3276.pdf">N3276</a></td>
 152       <td class="full" align="center">Clang 3.1</td>
 153     </tr>
 154     <tr>
 155       <td>Right angle brackets</td>
 156       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a></td>
 157       <td class="full" align="center">Clang 2.9</td>
 158     </tr>
 159     <tr>
 160       <td>Default template arguments for function templates</td>
 161       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#226">DR226</a></td>
 162       <td class="full" align="center">Clang 2.9</td>
 163     </tr>
 164     <tr>
 165       <td>Solving the SFINAE problem for expressions</td>
 166       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2634.html">DR339</a></td>
 167       <td class="full" align="center">Clang 2.9</td>
 168     </tr>
 169     <tr>
 170       <td>Alias templates</td>
 171       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf">N2258</a></td>
 172       <td class="full" align="center">Clang 3.0</td>
 173     </tr>
 174     <tr>
 175       <td>Extern templates</td>
 176       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1987.htm">N1987</a></td>
 177       <td class="full" align="center">Clang 2.9</td>
 178     </tr>
 179     <tr>
 180       <td>Null pointer constant</td>
 181       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a></td>
 182       <td class="full" align="center">Clang 3.0</td>
 183     </tr>
 184     <tr>
 185       <td>Strongly-typed enums</td>
 186       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf">N2347</a></td>
 187       <td class="full" align="center">Clang 2.9</td>
 188     </tr>
 189     <tr>
 190       <td>Forward declarations for enums</td>
 191       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2764.pdf">N2764</a>
 192       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1206">DR1206</a></td>
 193       <td class="full" align="center">Clang 3.1</td>
 194     </tr>
 195     <tr>
 196       <td>Standardized attribute syntax</td>
 197       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2761.pdf">N2761</a></td>
 198       <td class="full" align="center">Clang 3.3 <a href="#n2761">(1)</a></td>
 199     </tr>
 200     <tr>
 201       <td>Generalized constant expressions</td>
 202       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf">N2235</a></td>
 203       <td class="full" align="center">Clang 3.1</td>
 204     </tr>
 205     <tr>
 206       <td>Alignment support</td>
 207       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf">N2341</a></td>
 208       <td class="full" align="center">Clang 3.3</td>
 209     </tr>
 210     <tr>
 211       <td>Conditionally-support behavior</td>
 212       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1627.pdf">N1627</a></td>
 213       <td class="full" align="center">Clang 2.9</td>
 214     </tr>
 215     <tr>
 216       <td>Changing undefined behavior into diagnosable errors</td>
 217       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1727.pdf">N1727</a></td>
 218       <td class="full" align="center">Clang 2.9</td>
 219     </tr>
 220     <tr>
 221       <td>Delegating constructors</td>
 222       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf">N1986</a></td>
 223       <td class="full" align="center">Clang 3.0</td>
 224     </tr>
 225     <tr>
 226       <td>Inheriting constructors</td>
 227       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2540.htm">N2540</a></td>
 228       <td class="full" align="center">Clang 3.3</td>
 229     </tr>
 230     <tr>
 231       <td>Explicit conversion operators</td>
 232       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a></td>
 233       <td class="full" align="center">Clang 3.0</td>
 234     </tr>
 235     <tr>
 236       <td>New character types</td>
 237       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2249.html">N2249</a></td>
 238       <td class="full" align="center">Clang 2.9</td>
 239     </tr>
 240     <tr>
 241       <td>Unicode string literals</td>
 242       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
 243       <td class="full" align="center">Clang 3.0</td>
 244     </tr>
 245     <tr>
 246       <td>Raw string literals</td>
 247       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
 248       <td class="full" align="center">Clang 3.0</td>
 249     </tr>
 250     <tr>
 251       <td>Universal character names in literals</td>
 252       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2170.html">N2170</a></td>
 253       <td class="full" align="center">Clang 3.1</td>
 254     </tr>
 255     <tr>
 256       <td>User-defined literals</td>
 257       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2765.pdf">N2765</a></td>
 258       <td class="full" align="center">Clang 3.1</td>
 259     </tr>
 260     <tr>
 261       <td>Standard Layout Types</td>
 262       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2342.htm">N2342</a></td>
 263       <td class="full" align="center">Clang 3.0</td>
 264     </tr>
 265     <tr>
 266       <td>Defaulted functions</td>
 267       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
 268       <td class="full" align="center">Clang 3.0</td>
 269     </tr>
 270     <tr>
 271       <td>Deleted functions</td>
 272       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
 273       <td class="full" align="center">Clang 2.9</td>
 274     </tr>
 275     <tr>
 276       <td>Extended friend declarations</td>
 277       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1791.pdf">N1791</a></td>
 278       <td class="full" align="center">Clang 2.9</td>
 279     </tr>
 280     <tr>
 281       <td>Extending <code>sizeof</code></td>
 282       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2253.html">N2253</a>
 283       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#850">DR850</a></td>
 284       <td class="full" align="center">Clang 3.1</td>
 285     </tr>
 286     <tr>
 287       <td>Inline namespaces</td>
 288       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2535.htm">N2535</a></td>
 289       <td class="full" align="center">Clang 2.9</td>
 290     </tr>
 291     <tr>
 292       <td>Unrestricted unions</td>
 293       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2544.pdf">N2544</a></td>
 294       <td class="full" align="center">Clang 3.1</td>
 295     </tr>
 296     <tr>
 297       <td>Local and unnamed types as template arguments</td>
 298       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm">N2657</a></td>
 299       <td class="full" align="center">Clang 2.9</td>
 300     </tr>
 301     <tr>
 302       <td>Range-based for</td>
 303       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2930.html">N2930</a></td>
 304       <td class="full" align="center">Clang 3.0</td>
 305     </tr>
 306     <tr>
 307       <td>Explicit virtual overrides</td>
 308       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2928.htm">N2928</a>
 309       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3206.htm">N3206</a>
 310       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3272.htm">N3272</a></td>
 311       <td class="full" align="center">Clang 3.0</td>
 312     </tr>
 313     <tr>
 314       <td>Minimal support for garbage collection and reachability-based leak detection</td>
 315       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2670.htm">N2670</a></td>
 316       <td class="na" align="center">N/A <a href="#n2670">(2)</a></td>
 317     </tr>
 318     <tr>
 319       <td>Allowing move constructors to throw [noexcept]</td>
 320       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3050.html">N3050</a></td>
 321       <td class="full" align="center">Clang 3.0</td>
 322     </tr>
 323     <tr>
 324       <td>Defining move special member functions</td>
 325       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3053.html">N3053</a></td>
 326       <td class="full" align="center">Clang 3.0</td>
 327     </tr>
 328
 329     <tr class="separator">
 330       <th align="center" colspan="3">Concurrency</th>
 331     </tr>
 332     <tr>
 333       <td>Sequence points</td>
 334       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2239.html">N2239</a></td>
 335       <td class="full" align="center">Clang 3.3</td>
 336     </tr>
 337     <tr>
 338       <td>Atomic operations</td>
 339       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html">N2427</a></td>
 340       <td class="full" align="center">Clang 3.1</td>
 341     </tr>
 342     <tr>
 343       <td>Strong Compare and Exchange</td>
 344       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2748.html">N2748</a></td>
 345       <td class="full" align="center">Clang 3.1 <a href="#n2748">(3)</a></td>
 346     </tr>
 347     <tr>
 348       <td>Bidirectional Fences</td>
 349       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2752.htm">N2752</a></td>
 350       <td class="full" align="center">Clang 3.1</td>
 351     </tr>
 352
 353     <tr>
 354       <td>Memory model</td>
 355       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2429.htm">N2429</a></td>
 356       <td class="full" align="center">Clang 3.2</td>
 357     </tr>
 358     <tr>
 359       <td>Data-dependency ordering: atomics and memory model</td>
 360       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2664.htm">N2664</a></td>
 361       <td class="full" align="center">Clang 3.2 <a href="#n2664">(4)</a></td>
 362     </tr>
 363     <tr>
 364       <td>Propagating exceptions</td>
 365       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html">N2179</a></td>
 366       <td class="full" align="center">Clang 2.9</td>
 367     </tr>
 368     <tr>
 369       <td>Allow atomics use in signal handlers</td>
 370       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2547.htm">N2547</a></td>
 371       <td class="full" align="center">Clang 3.1</td>
 372     </tr>
 373     <tr>
 374       <td>Thread-local storage</td>
 375       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2659.htm">N2659</a></td>
 376       <td class="full" align="center">Clang 3.3</td>
 377     </tr>
 378     <tr>
 379       <td>Dynamic initialization and destruction with concurrency</td>
 380       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">N2660</a></td>
 381       <td class="full" align="center">Clang 2.9</td>
 382     </tr>
 383
 384     <tr class="separator">
 385       <th align="center" colspan="3">C99 Features in C++11</th>
 386     </tr>
 387     <tr>
 388       <td><code>__func__</code> predefined identifier</td>
 389       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2340.htm">N2340</a></td>
 390       <td class="full" align="center">Clang 2.9</td>
 391     </tr>
 392     <tr>
 393       <td>C99 preprocessor</td>
 394       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1653.htm">N1653</a></td>
 395       <td class="full" align="center">Clang 2.9</td>
 396     </tr>
 397     <tr>
 398       <td><code>long long</code></td>
 399       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1811.pdf">N1811</a></td>
 400       <td class="full" align="center">Clang 2.9</td>
 401     </tr>
 402     <tr>
 403       <td>Extended integral types</td>
 404       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1988.pdf">N1988</a></td>
 405       <td class="na" align="center">N/A <a href="#n1988">(5)</a></td>
 406     </tr>
 407 </table>
 408
 409 <p>
 410 <span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute
 411 has no effect.</span><br>
 412 <span id="n2670">(2): No compiler changes are required for an implementation
 413 such as Clang that does not provide garbage collection.</span><br>
 414 <span id="n2748">(3): All compare-exchange operations are emitted as
 415 strong compare-exchanges.</span><br>
 416 <span id="n2664">(4): <code>memory_order_consume</code> is lowered to
 417 <code>memory_order_acquire</code>.</span><br>
 418 <span id="n1988">(5): No compiler changes are required for an implementation
 419 such as Clang that does not provide any extended integer types.
 420 <code>__int128</code> is not treated as an extended integer type,
 421 because changing <code>intmax_t</code> would be an ABI-incompatible
 422 change.</span>
 423 </p>
 424
 425 <h2 id="cxx14">C++14 implementation status</h2>
 426
 427 <p>Clang 3.4 and later implement all of the Draft International Standard (see <a
 428 href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3797.pdf">most
 429 recent publicly available draft</a>)
 430 of the upcoming C++14 language standard. The following table describes the
 431 Clang version in which each feature became available.</p>
 432
 433 <p>You can use Clang in C++14 mode with the <code>-std=c++14</code> option
 434 (use <code>-std=c++1y</code> in Clang 3.4 and earlier).</p>
 435
 436 <table width="689" border="1" cellspacing="0">
 437  <tr>
 438     <th>Language Feature</th>
 439     <th>C++14 Proposal</th>
 440     <th>Available in Clang?</th>
 441  </tr>
 442     <tr>
 443       <td>Tweak to certain C++ contextual conversions</td>
 444       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3323.pdf">N3323</a></td>
 445       <td class="full" align="center">Clang 3.4</td>
 446     </tr>
 447     <tr>
 448       <td>Binary literals</td>
 449       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3472.pdf">N3472</a></td>
 450       <td class="full" align="center">Yes</td>
 451     </tr>
 452     <tr>
 453       <td>decltype(auto)</td>
 454       <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>
 455       <td class="full" align="center">Clang 3.3</td>
 456     </tr>
 457     <tr>
 458       <td>Return type deduction for normal functions</td>
 459       <td class="full" align="center">Clang 3.4</td>
 460     </tr>
 461     <tr>
 462       <td>Initialized lambda captures</td>
 463       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3648.html">N3648</a></td>
 464       <td class="full" align="center">Clang 3.4</td>
 465     </tr>
 466     <tr>
 467       <td>Generic lambdas</td>
 468       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3649.html">N3649</a></td>
 469       <td class="full" align="center">Clang 3.4</td>
 470     </tr>
 471     <tr>
 472       <td>Variable templates</td>
 473       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3651.pdf">N3651</a></td>
 474       <td class="full" align="center">Clang 3.4</td>
 475     </tr>
 476     <tr>
 477       <td>Relaxing requirements on constexpr functions</td>
 478       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3652.html">N3652</a></td>
 479       <td class="full" align="center">Clang 3.4</td>
 480     </tr>
 481     <tr>
 482       <td>Member initializers and aggregates</td>
 483       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3653.html">N3653</a></td>
 484       <td class="full" align="center">Clang 3.3</td>
 485     </tr>
 486     <tr>
 487       <td>Clarifying memory allocation</td>
 488       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3664.html">N3664</a></td>
 489       <td class="full" align="center">Clang 3.4</td>
 490     </tr>
 491     <tr>
 492       <td><tt>[[deprecated]]</tt> attribute</td>
 493       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3760.html">N3760</a></td>
 494       <td class="full" align="center">Clang 3.4</td>
 495     </tr>
 496     <tr>
 497       <td>Single quotation mark as digit separator</td>
 498       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3781.pdf">N3781</a></td>
 499       <td class="full" align="center">Clang 3.4</td>
 500     </tr>
 501     <tr>
 502       <td>C++ Sized Deallocation</td>
 503       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3778.html">N3778</a></td>
 504       <td class="full" align="center">Clang 3.4</td>
 505     </tr>
 506 </table>
 507
 508 <h2 id="cxx17">C++1z implementation status</h2>
 509
 510 <p>Clang has <b>highly experimental</b> support for some proposed features of
 511 the C++ standard following C++14,
 512 provisionally named C++1z.  The following table describes which C++1z features
 513 have been implemented in Clang and in which Clang version they became
 514 available.</p>
 515
 516 <p>Note that support for these features may change or be removed without notice,
 517 as the draft C++1z standard evolves.</p>
 518
 519 <p>You can use Clang in C++1z mode with the <code>-std=c++1z</code> option.</p>
 520
 521 <table width="689" border="1" cellspacing="0">
 522  <tr>
 523     <th>Language Feature</th>
 524     <th>C++1z Proposal</th>
 525     <th>Available in Clang?</th>
 526  </tr>
 527     <!-- Issaquah papers -->
 528     <tr>
 529       <td><tt>static_assert</tt> with no message</td>
 530       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3928.pdf">N3928</a></td>
 531       <td class="full" align="center">Clang 3.5</td>
 532     </tr>
 533     <!-- Rapperswil papers -->
 534     <tr>
 535       <td>Disabling trigraph expansion by default</td>
 536       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4086.html">N4086</a></td>
 537       <td class="full" align="center">Clang 3.5</td>
 538     </tr>
 539     <tr>
 540       <td>Terse range-based for loops</td>
 541       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3994.htm">N3994</a></td>
 542       <td class="full" align="center">Clang 3.5</td>
 543     </tr>
 544     <tr>
 545       <td><tt>typename</tt> in a template template parameter</td>
 546       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4051.html">N4051</a></td>
 547       <td class="full" align="center">Clang 3.5</td>
 548     </tr>
 549     <tr>
 550       <td>New <tt>auto</tt> rules for direct-list-initialization
 551       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3922.html">N3922</a></td>
 552       <td class="no" align="center">No</td>
 553     </tr>
 554     <!-- Urbana papers -->
 555     <tr>
 556       <td>Fold expressions</td>
 557       <td><!--<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4295.html">-->N4295<!--</a>--></td>
 558       <td class="svn" align="center">SVN</td>
 559     </tr>
 560     <tr>
 561       <td><tt>u8</tt> character literals</td>
 562       <td><!--<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4267.html">-->N4267<!--</a>--></td>
 563       <td class="svn" align="center">SVN</td>
 564     </tr>
 565     <tr>
 566       <td>Nested namespace definition</td>
 567       <td><!--<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4230.html">-->N4230<!--</a>--></td>
 568       <td class="svn" align="center">SVN</td>
 569     </tr>
 570     <tr>
 571       <td>Attributes for namespaces and enumerators</td>
 572       <td><!--<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4266.html">-->N4266<!--</a>--></td>
 573       <td class="svn" align="center">SVN</td>
 574     </tr>
 575     <tr>
 576       <td>Allow constant evaluation for all non-type template arguments</td>
 577       <td><!--<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4268.html">-->N4268<!--</a>--></td>
 578       <td class="svn" align="center">SVN</td>
 579     </tr>
 580 </table>
 581
 582 <h2 id="ts">Technical specifications and standing documents</h2>
 583
 584 <p>ISO C++ also publishes a number of documents describing additional language
 585 and library features that are not part of standard C++. The following table
 586 describes which language features have been implemented in Clang and in which
 587 Clang version they became available:</p>
 588
 589 <table width="689" border="1" cellspacing="0">
 590  <tr>
 591     <th>Document</th>
 592     <th>Latest draft</th>
 593     <th>Available in Clang?</th>
 594  </tr>
 595     <tr>
 596       <td rowspan="2">SD-6: SG10 feature test recommendations</td>
 597       <td rowspan="2"><a href="http://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6</a></td>
 598       <td class="full" align="center">
 599         Clang 3.4 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3745">N3745</a>)</br>
 600       </td>
 601     </tr>
 602     <tr>
 603       <td class="full" align="center">
 604         SVN (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4200">N4200</a>)</a>
 605       </td>
 606     </tr>
 607     <tr>
 608       <td>[DRAFT TS] Array extensions (arrays of runtime bound)</td>
 609       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3820.html">N3820</a></td>
 610       <td class="none" align="center">No</td>
 611     </tr>
 612     <tr>
 613       <td>[DRAFT TS] Library fundamentals (invocation type traits)</td>
 614       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3908.html">N3908</a></td>
 615       <td class="none" align="center">No</td>
 616     </tr>
 617     <tr>
 618       <td>[DRAFT TS] Concepts</td>
 619       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3929.pdf">N3929</a></td>
 620       <td class="none" align="center">No</td>
 621     </tr>
 622 </table>
 623
 624 </div>
 625 </body>
 626 </html>