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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">Clang 2.9</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 <a href="#n3778">(6)</a></td>
 505     </tr>
 506 </table>
 507 <p>
 508 <span id="n3778">(6): In Clang SVN, using sized deallocation in C++14 mode requires linking either
 509 libc++ 3.7 or later, or libstdc++ 5 or later. Alternatively, you can use the
 510 <code>-Xclang -fdefine-sized-deallocation</code> compiler option to enable the implementation from
 511 Clang 3.4 through Clang 3.6, where weak definitions of sized deallocation functions are implicitly
 512 generated (by the compiler). You can also use the <code>-Xclang -fno-sized-deallocation</code> option
 513 to disable sized deallocation. Note that both of these flags arw temporary provisions and may go away
 514 soon.
 515 </span>
 516 </p>
 517
 518 <h2 id="cxx17">C++1z implementation status</h2>
 519
 520 <p>Clang has <b>highly experimental</b> support for some proposed features of
 521 the C++ standard following C++14,
 522 provisionally named C++1z.  The following table describes which C++1z features
 523 have been implemented in Clang and in which Clang version they became
 524 available.</p>
 525
 526 <p>Note that support for these features may change or be removed without notice,
 527 as the draft C++1z standard evolves.</p>
 528
 529 <p>You can use Clang in C++1z mode with the <code>-std=c++1z</code> option.</p>
 530
 531 <table width="689" border="1" cellspacing="0">
 532  <tr>
 533     <th>Language Feature</th>
 534     <th>C++1z Proposal</th>
 535     <th>Available in Clang?</th>
 536  </tr>
 537     <!-- Issaquah papers -->
 538     <tr>
 539       <td><tt>static_assert</tt> with no message</td>
 540       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3928.pdf">N3928</a></td>
 541       <td class="full" align="center">Clang 3.5</td>
 542     </tr>
 543     <!-- Rapperswil papers -->
 544     <tr>
 545       <td>Disabling trigraph expansion by default</td>
 546       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4086.html">N4086</a></td>
 547       <td class="full" align="center">Clang 3.5</td>
 548     </tr>
 549     <!--
 550     <tr>
 551       <td rowspan="2">Terse range-based for loops (removed from C++1z)</td>
 552       <td rowspan="2"><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3994.htm">N3994</a></td>
 553       <td class="none" align="center">Clang 3.5: Yes</td>
 554     </tr>
 555     <tr>
 556       <td class="svn" align="center">SVN: No</td>
 557     </tr>
 558     -->
 559     <tr>
 560       <td><tt>typename</tt> in a template template parameter</td>
 561       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4051.html">N4051</a></td>
 562       <td class="full" align="center">Clang 3.5</td>
 563     </tr>
 564     <tr>
 565       <td>New <tt>auto</tt> rules for direct-list-initialization
 566       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3922.html">N3922</a></td>
 567       <td class="none" align="center">No</td>
 568     </tr>
 569     <!-- Urbana papers -->
 570     <tr>
 571       <td>Fold expressions</td>
 572       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4295.html">N4295</a></td>
 573       <td class="svn" align="center">Clang 3.6</td>
 574     </tr>
 575     <tr>
 576       <td><tt>u8</tt> character literals</td>
 577       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4267.html">N4267</a></td>
 578       <td class="svn" align="center">Clang 3.6</td>
 579     </tr>
 580     <tr>
 581       <td>Nested namespace definition</td>
 582       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4230.html">N4230</a></td>
 583       <td class="svn" align="center">Clang 3.6</td>
 584     </tr>
 585     <tr>
 586       <td>Attributes for namespaces and enumerators</td>
 587       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4266.html">N4266</a></td>
 588       <td class="svn" align="center">Clang 3.6</td>
 589     </tr>
 590     <tr>
 591       <td>Allow constant evaluation for all non-type template arguments</td>
 592       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4268.html">N4268</a></td>
 593       <td class="svn" align="center">Clang 3.6</td>
 594     </tr>
 595 </table>
 596
 597 <h2 id="ts">Technical specifications and standing documents</h2>
 598
 599 <p>ISO C++ also publishes a number of documents describing additional language
 600 and library features that are not part of standard C++. The following table
 601 describes which language features have been implemented in Clang and in which
 602 Clang version they became available:</p>
 603
 604 <table width="689" border="1" cellspacing="0">
 605  <tr>
 606     <th>Document</th>
 607     <th>Latest draft</th>
 608     <th>Available in Clang?</th>
 609  </tr>
 610     <tr>
 611       <td rowspan="2">SD-6: SG10 feature test recommendations</td>
 612       <td rowspan="2"><a href="http://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6</a></td>
 613       <td class="full" align="center">
 614         Clang 3.4 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3745">N3745</a>)</br>
 615       </td>
 616     </tr>
 617     <tr>
 618       <td class="svn" align="center">
 619         Clang 3.6 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4200">N4200</a>)</a>
 620       </td>
 621     </tr>
 622     <tr>
 623       <td>[DRAFT TS] Array extensions (arrays of runtime bound)</td>
 624       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3820.html">N3820</a></td>
 625       <td class="none" align="center">No</td>
 626     </tr>
 627     <tr>
 628       <td>[DRAFT TS] Library fundamentals (invocation type traits)</td>
 629       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3908.html">N3908</a></td>
 630       <td class="none" align="center">No</td>
 631     </tr>
 632     <tr>
 633       <td>[DRAFT TS] Concepts</td>
 634       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3929.pdf">N3929</a></td>
 635       <td class="none" align="center">No</td>
 636     </tr>
 637 </table>
 638
 639 </div>
 640 </body>
 641 </html>