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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.
  71
  72 <table width="689" border="1" cellspacing="0">
  73  <tr>
  74     <th>Language Feature</th>
  75     <th>C++11 Proposal</th>
  76     <th>Available in Clang?</th>
  77  </tr>
  78      <tr>
  79       <td>Rvalue references</td>
  80       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2118.html">N2118</a></td>
  81       <td class="full" align="center">Clang 2.9</td>
  82     </tr>
  83     <tr>
  84       <td>&nbsp;&nbsp;&nbsp;&nbsp;Rvalue references for <code>*this</code></td>
  85       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2439.htm">N2439</a></td>
  86       <td class="full" align="center">Clang 2.9</td>
  87     </tr>
  88     <tr>
  89       <td>Initialization of class objects by rvalues</td>
  90       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1610.html">N1610</a></td>
  91       <td class="full" align="center">Clang 2.9</td>
  92     </tr>
  93     <tr>
  94       <td>Non-static data member initializers</td>
  95       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2008/n2756.htm">N2756</a></td>
  96       <td class="full" align="center">Clang 3.0</td>
  97     </tr>
  98     <tr>
  99       <td>Variadic templates</td>
 100       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2242.pdf">N2242</a></td>
 101       <td class="full" align="center">Clang 2.9</td>
 102     </tr>
 103     <tr>
 104       <td>&nbsp;&nbsp;&nbsp;&nbsp;Extending variadic template template parameters</td>
 105       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2555.pdf">N2555</a></td>
 106       <td class="full" align="center">Clang 2.9</td>
 107     </tr>
 108     <tr>
 109       <td>Initializer lists</td>
 110       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2672.htm">N2672</a></td>
 111       <td class="full" align="center">Clang 3.1</td>
 112     </tr>
 113     <tr>
 114       <td>Static assertions</td>
 115       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.html">N1720</a></td>
 116       <td class="full" align="center">Clang 2.9</td>
 117     </tr>
 118     <tr>
 119       <td><code>auto</code>-typed variables</td>
 120       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf">N1984</a></td>
 121       <td class="full" align="center">Clang 2.9</td>
 122     </tr>
 123     <tr>
 124       <td>&nbsp;&nbsp;&nbsp;&nbsp;Multi-declarator <code>auto</code></td>
 125       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1737.pdf">N1737</a></td>
 126       <td class="full" align="center">Clang 2.9</td>
 127     </tr>
 128     <tr>
 129       <td>&nbsp;&nbsp;&nbsp;&nbsp;Removal of auto as a storage-class specifier</td>
 130       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2546.htm">N2546</a></td>
 131       <td class="full" align="center">Clang 2.9</td>
 132     </tr>
 133     <tr>
 134       <td>&nbsp;&nbsp;&nbsp;&nbsp;New function declarator syntax</td>
 135       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2541.htm">N2541</a></td>
 136       <td class="full" align="center">Clang 2.9</td>
 137     </tr>
 138     <tr>
 139       <td>Lambda expressions</td>
 140       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2927.pdf">N2927</a></td>
 141       <td class="full" align="center">Clang 3.1</td>
 142     </tr>
 143     <tr>
 144       <td>Declared type of an expression</td>
 145       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a></td>
 146       <td class="full" align="center">Clang 2.9</td>
 147     </tr>
 148     <tr>
 149       <td>&nbsp;&nbsp;&nbsp;&nbsp;Incomplete return types</td>
 150       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3276.pdf">N3276</a></td>
 151       <td class="full" align="center">Clang 3.1</td>
 152     </tr>
 153     <tr>
 154       <td>Right angle brackets</td>
 155       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a></td>
 156       <td class="full" align="center">Clang 2.9</td>
 157     </tr>
 158     <tr>
 159       <td>Default template arguments for function templates</td>
 160       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#226">DR226</a></td>
 161       <td class="full" align="center">Clang 2.9</td>
 162     </tr>
 163     <tr>
 164       <td>Solving the SFINAE problem for expressions</td>
 165       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2634.html">DR339</a></td>
 166       <td class="full" align="center">Clang 2.9</td>
 167     </tr>
 168     <tr>
 169       <td>Alias templates</td>
 170       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf">N2258</a></td>
 171       <td class="full" align="center">Clang 3.0</td>
 172     </tr>
 173     <tr>
 174       <td>Extern templates</td>
 175       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1987.htm">N1987</a></td>
 176       <td class="full" align="center">Clang 2.9</td>
 177     </tr>
 178     <tr>
 179       <td>Null pointer constant</td>
 180       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a></td>
 181       <td class="full" align="center">Clang 3.0</td>
 182     </tr>
 183     <tr>
 184       <td>Strongly-typed enums</td>
 185       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf">N2347</a></td>
 186       <td class="full" align="center">Clang 2.9</td>
 187     </tr>
 188     <tr>
 189       <td>Forward declarations for enums</td>
 190       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2764.pdf">N2764</a>
 191       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1206">DR1206</a></td>
 192       <td class="full" align="center">Clang 3.1</td>
 193     </tr>
 194     <tr>
 195       <td>Standardized attribute syntax</td>
 196       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2761.pdf">N2761</a></td>
 197       <td class="full" align="center">Clang 3.3 <a href="#n2761">(1)</a></td>
 198     </tr>
 199     <tr>
 200       <td>Generalized constant expressions</td>
 201       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf">N2235</a></td>
 202       <td class="full" align="center">Clang 3.1</td>
 203     </tr>
 204     <tr>
 205       <td>Alignment support</td>
 206       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf">N2341</a></td>
 207       <td class="full" align="center">Clang 3.3</td>
 208     </tr>
 209     <tr>
 210       <td>Conditionally-support behavior</td>
 211       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1627.pdf">N1627</a></td>
 212       <td class="full" align="center">Clang 2.9</td>
 213     </tr>
 214     <tr>
 215       <td>Changing undefined behavior into diagnosable errors</td>
 216       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1727.pdf">N1727</a></td>
 217       <td class="full" align="center">Clang 2.9</td>
 218     </tr>
 219     <tr>
 220       <td>Delegating constructors</td>
 221       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf">N1986</a></td>
 222       <td class="full" align="center">Clang 3.0</td>
 223     </tr>
 224     <tr>
 225       <td>Inheriting constructors</td>
 226       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2540.htm">N2540</a></td>
 227       <td class="full" align="center">Clang 3.3</td>
 228     </tr>
 229     <tr>
 230       <td>Explicit conversion operators</td>
 231       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a></td>
 232       <td class="full" align="center">Clang 3.0</td>
 233     </tr>
 234     <tr>
 235       <td>New character types</td>
 236       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2249.html">N2249</a></td>
 237       <td class="full" align="center">Clang 2.9</td>
 238     </tr>
 239     <tr>
 240       <td>Unicode string literals</td>
 241       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
 242       <td class="full" align="center">Clang 3.0</td>
 243     </tr>
 244     <tr>
 245       <td>Raw string literals</td>
 246       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
 247       <td class="full" align="center">Clang 3.0</td>
 248     </tr>
 249     <tr>
 250       <td>Universal character names in literals</td>
 251       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2170.html">N2170</a></td>
 252       <td class="full" align="center">Clang 3.1</td>
 253     </tr>
 254     <tr>
 255       <td>User-defined literals</td>
 256       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2765.pdf">N2765</a></td>
 257       <td class="full" align="center">Clang 3.1</td>
 258     </tr>
 259     <tr>
 260       <td>Standard Layout Types</td>
 261       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2342.htm">N2342</a></td>
 262       <td class="full" align="center">Clang 3.0</td>
 263     </tr>
 264     <tr>
 265       <td>Defaulted functions</td>
 266       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
 267       <td class="full" align="center">Clang 3.0</td>
 268     </tr>
 269     <tr>
 270       <td>Deleted functions</td>
 271       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
 272       <td class="full" align="center">Clang 2.9</td>
 273     </tr>
 274     <tr>
 275       <td>Extended friend declarations</td>
 276       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1791.pdf">N1791</a></td>
 277       <td class="full" align="center">Clang 2.9</td>
 278     </tr>
 279     <tr>
 280       <td>Extending <code>sizeof</code></td>
 281       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2253.html">N2253</a>
 282       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#850">DR850</a></td>
 283       <td class="full" align="center">Clang 3.1</td>
 284     </tr>
 285     <tr>
 286       <td>Inline namespaces</td>
 287       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2535.htm">N2535</a></td>
 288       <td class="full" align="center">Clang 2.9</td>
 289     </tr>
 290     <tr>
 291       <td>Unrestricted unions</td>
 292       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2544.pdf">N2544</a></td>
 293       <td class="full" align="center">Clang 3.1</td>
 294     </tr>
 295     <tr>
 296       <td>Local and unnamed types as template arguments</td>
 297       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm">N2657</a></td>
 298       <td class="full" align="center">Clang 2.9</td>
 299     </tr>
 300     <tr>
 301       <td>Range-based for</td>
 302       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2930.html">N2930</a></td>
 303       <td class="full" align="center">Clang 3.0</td>
 304     </tr>
 305     <tr>
 306       <td>Explicit virtual overrides</td>
 307       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2928.htm">N2928</a>
 308       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3206.htm">N3206</a>
 309       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3272.htm">N3272</a></td>
 310       <td class="full" align="center">Clang 3.0</td>
 311     </tr>
 312     <tr>
 313       <td>Minimal support for garbage collection and reachability-based leak detection</td>
 314       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2670.htm">N2670</a></td>
 315       <td class="na" align="center">N/A <a href="#n2670">(2)</a></td>
 316     </tr>
 317     <tr>
 318       <td>Allowing move constructors to throw [noexcept]</td>
 319       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3050.html">N3050</a></td>
 320       <td class="full" align="center">Clang 3.0</td>
 321     </tr>
 322     <tr>
 323       <td>Defining move special member functions</td>
 324       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3053.html">N3053</a></td>
 325       <td class="full" align="center">Clang 3.0</td>
 326     </tr>
 327
 328     <tr class="separator">
 329       <th align="center" colspan="3">Concurrency</th>
 330     </tr>
 331     <tr>
 332       <td>Sequence points</td>
 333       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2239.html">N2239</a></td>
 334       <td class="full" align="center">Clang 3.3</td>
 335     </tr>
 336     <tr>
 337       <td>Atomic operations</td>
 338       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html">N2427</a></td>
 339       <td class="full" align="center">Clang 3.1</td>
 340     </tr>
 341     <tr>
 342       <td>Strong Compare and Exchange</td>
 343       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2748.html">N2748</a></td>
 344       <td class="full" align="center">Clang 3.1 <a href="#n2748">(3)</a></td>
 345     </tr>
 346     <tr>
 347       <td>Bidirectional Fences</td>
 348       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2752.htm">N2752</a></td>
 349       <td class="full" align="center">Clang 3.1</td>
 350     </tr>
 351
 352     <tr>
 353       <td>Memory model</td>
 354       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2429.htm">N2429</a></td>
 355       <td class="full" align="center">Clang 3.2</td>
 356     </tr>
 357     <tr>
 358       <td>Data-dependency ordering: atomics and memory model</td>
 359       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2664.htm">N2664</a></td>
 360       <td class="full" align="center">Clang 3.2 <a href="#n2664">(4)</a></td>
 361     </tr>
 362     <tr>
 363       <td>Propagating exceptions</td>
 364       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html">N2179</a></td>
 365       <td class="full" align="center">Clang 2.9</td>
 366     </tr>
 367     <tr>
 368       <td>Allow atomics use in signal handlers</td>
 369       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2547.htm">N2547</a></td>
 370       <td class="full" align="center">Clang 3.1</td>
 371     </tr>
 372     <tr>
 373       <td>Thread-local storage</td>
 374       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2659.htm">N2659</a></td>
 375       <td class="full" align="center">Clang 3.3 <a href="#n2659">(5)</a></td>
 376     </tr>
 377     <tr>
 378       <td>Dynamic initialization and destruction with concurrency</td>
 379       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">N2660</a></td>
 380       <td class="full" align="center">Clang 2.9</td>
 381     </tr>
 382
 383     <tr class="separator">
 384       <th align="center" colspan="3">C99 Features in C++11</th>
 385     </tr>
 386     <tr>
 387       <td><code>__func__</code> predefined identifier</td>
 388       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2340.htm">N2340</a></td>
 389       <td class="full" align="center">Clang 2.9</td>
 390     </tr>
 391     <tr>
 392       <td>C99 preprocessor</td>
 393       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1653.htm">N1653</a></td>
 394       <td class="full" align="center">Clang 2.9</td>
 395     </tr>
 396     <tr>
 397       <td><code>long long</code></td>
 398       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1811.pdf">N1811</a></td>
 399       <td class="full" align="center">Clang 2.9</td>
 400     </tr>
 401     <tr>
 402       <td>Extended integral types</td>
 403       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1988.pdf">N1988</a></td>
 404       <td class="na" align="center">N/A <a href="#n1988">(6)</a></td>
 405     </tr>
 406 </table>
 407
 408 <p>
 409 <span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute
 410 has no effect.</span><br>
 411 <span id="n2670">(2): No compiler changes are required for an implementation
 412 such as Clang that does not provide garbage collection.</span><br>
 413 <span id="n2748">(3): All compare-exchange operations are emitted as
 414 strong compare-exchanges.</span><br>
 415 <span id="n2664">(4): <code>memory_order_consume</code> is lowered to
 416 <code>memory_order_acquire</code>.</span><br>
 417 <span id="n2659">(5): <code>thread_local</code> support
 418 requires a C++ runtime library providing <code>__cxa_thread_atexit</code>, such
 419 as <a href="http://libcxxabi.llvm.org">libc++abi</a> 3.6 or later,
 420 or libsupc++ 4.8 or later.</span><br>
 421 <span id="n1988">(6): No compiler changes are required for an implementation
 422 such as Clang that does not provide any extended integer types.
 423 <code>__int128</code> is not treated as an extended integer type,
 424 because changing <code>intmax_t</code> would be an ABI-incompatible
 425 change.</span>
 426 </p>
 427
 428 <h2 id="cxx14">C++14 implementation status</h2>
 429
 430 <p>Clang 3.4 and later implement all of the Draft International Standard (see <a
 431 href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3797.pdf">most
 432 recent publicly available draft</a>)
 433 of the upcoming C++14 language standard. The following table describes the
 434 Clang version in which each feature became available.</p>
 435
 436 <p>You can use Clang in C++14 mode with the <code>-std=c++14</code> option
 437 (use <code>-std=c++1y</code> in Clang 3.4 and earlier).</p>
 438
 439 <table width="689" border="1" cellspacing="0">
 440  <tr>
 441     <th>Language Feature</th>
 442     <th>C++14 Proposal</th>
 443     <th>Available in Clang?</th>
 444  </tr>
 445     <tr>
 446       <td>Tweak to certain C++ contextual conversions</td>
 447       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3323.pdf">N3323</a></td>
 448       <td class="full" align="center">Clang 3.4</td>
 449     </tr>
 450     <tr>
 451       <td>Binary literals</td>
 452       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3472.pdf">N3472</a></td>
 453       <td class="full" align="center">Clang 2.9</td>
 454     </tr>
 455     <tr>
 456       <td>decltype(auto)</td>
 457       <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>
 458       <td class="full" align="center">Clang 3.3</td>
 459     </tr>
 460     <tr>
 461       <td>Return type deduction for normal functions</td>
 462       <td class="full" align="center">Clang 3.4</td>
 463     </tr>
 464     <tr>
 465       <td>Initialized lambda captures</td>
 466       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3648.html">N3648</a></td>
 467       <td class="full" align="center">Clang 3.4</td>
 468     </tr>
 469     <tr>
 470       <td>Generic lambdas</td>
 471       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3649.html">N3649</a></td>
 472       <td class="full" align="center">Clang 3.4</td>
 473     </tr>
 474     <tr>
 475       <td>Variable templates</td>
 476       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3651.pdf">N3651</a></td>
 477       <td class="full" align="center">Clang 3.4</td>
 478     </tr>
 479     <tr>
 480       <td>Relaxing requirements on constexpr functions</td>
 481       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3652.html">N3652</a></td>
 482       <td class="full" align="center">Clang 3.4</td>
 483     </tr>
 484     <tr>
 485       <td>Member initializers and aggregates</td>
 486       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3653.html">N3653</a></td>
 487       <td class="full" align="center">Clang 3.3</td>
 488     </tr>
 489     <tr>
 490       <td>Clarifying memory allocation</td>
 491       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3664.html">N3664</a></td>
 492       <td class="full" align="center">Clang 3.4</td>
 493     </tr>
 494     <tr>
 495       <td><tt>[[deprecated]]</tt> attribute</td>
 496       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3760.html">N3760</a></td>
 497       <td class="full" align="center">Clang 3.4</td>
 498     </tr>
 499     <tr>
 500       <td>Single quotation mark as digit separator</td>
 501       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3781.pdf">N3781</a></td>
 502       <td class="full" align="center">Clang 3.4</td>
 503     </tr>
 504     <tr>
 505       <td>C++ Sized Deallocation</td>
 506       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3778.html">N3778</a></td>
 507       <td class="full" align="center">Clang 3.4 <a href="#n3778">(7)</a></td>
 508     </tr>
 509 </table>
 510
 511 <p>
 512 <span id="n3778">(7): In Clang 3.7 and later, sized deallocation is only enabled
 513 if the user passes the <code>-fsized-deallocation</code> flag. The user must
 514 supply definitions of the sized deallocation functions, either by providing them
 515 explicitly or by using a C++ standard library that does. <code>libstdc++</code>
 516 added these functions in version 5.0, and <code>libc++</code> added them in
 517 version 3.7.
 518 </span>
 519 </p>
 520
 521 <h2 id="cxx17">C++1z implementation status</h2>
 522
 523 <p>Clang has <b>experimental</b> support for some proposed features of
 524 the C++ standard following C++14, provisionally named C++1z.
 525 The following table describes which C++1z features
 526 have been implemented in Clang and in which Clang version they became
 527 available.</p>
 528
 529 <p>Note that support for these features may change or be removed without notice,
 530 as the draft C++1z standard evolves.</p>
 531
 532 <p>You can use Clang in C++1z mode with the <code>-std=c++1z</code> option.</p>
 533
 534 <table width="689" border="1" cellspacing="0">
 535  <tr>
 536     <th>Language Feature</th>
 537     <th>C++1z Proposal</th>
 538     <th>Available in Clang?</th>
 539  </tr>
 540     <!-- Issaquah papers -->
 541     <tr>
 542       <td><tt>static_assert</tt> with no message</td>
 543       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3928.pdf">N3928</a></td>
 544       <td class="full" align="center">Clang 3.5</td>
 545     </tr>
 546     <!-- Rapperswil papers -->
 547     <tr>
 548       <td>Disabling trigraph expansion by default</td>
 549       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4086.html">N4086</a></td>
 550       <td class="full" align="center">Clang 3.5</td>
 551     </tr>
 552     <!--
 553     <tr>
 554       <td rowspan="2">Terse range-based for loops (removed from C++1z)</td>
 555       <td rowspan="2"><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3994.htm">N3994</a></td>
 556       <td class="none" align="center">Clang 3.5: Yes</td>
 557     </tr>
 558     <tr>
 559       <td class="svn" align="center">SVN: No</td>
 560     </tr>
 561     -->
 562     <tr>
 563       <td><tt>typename</tt> in a template template parameter</td>
 564       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4051.html">N4051</a></td>
 565       <td class="full" align="center">Clang 3.5</td>
 566     </tr>
 567     <tr>
 568       <td>New <tt>auto</tt> rules for direct-list-initialization
 569       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3922.html">N3922</a></td>
 570       <td class="full" align="center">Clang 3.8 <a href="#n3922">(8)</a></td>
 571     </tr>
 572     <!-- Urbana papers -->
 573     <tr>
 574       <td rowspan="2">Fold expressions</td>
 575       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4295.html">N4295</a></td>
 576       <td class="full" align="center">Clang 3.6</td>
 577     </tr>
 578       <tr> <!-- from Jacksonville -->
 579         <td><a href="http://wg21.link/p0036r0">P0036R0</a></td>
 580         <td class="svn" align="center">SVN</td>
 581       </tr>
 582     <tr>
 583       <td><tt>u8</tt> character literals</td>
 584       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4267.html">N4267</a></td>
 585       <td class="full" align="center">Clang 3.6</td>
 586     </tr>
 587     <tr>
 588       <td>Nested namespace definition</td>
 589       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4230.html">N4230</a></td>
 590       <td class="full" align="center">Clang 3.6</td>
 591     </tr>
 592     <tr>
 593       <td>Attributes for namespaces and enumerators</td>
 594       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4266.html">N4266</a></td>
 595       <td class="full" align="center">Clang 3.6</td>
 596     </tr>
 597     <tr>
 598       <td>Allow constant evaluation for all non-type template arguments</td>
 599       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4268.html">N4268</a></td>
 600       <td class="full" align="center">Clang 3.6</td>
 601     </tr>
 602     <!-- Kona papers -->
 603     <tr>
 604       <td>Remove deprecated <tt>register</tt> storage class</td>
 605       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0001r1.html">P0001R1</a></td>
 606       <td class="full" align="center">Clang 3.8</td>
 607     </tr>
 608     <tr>
 609       <td>Remove deprecated <tt>bool</tt> increment</td>
 610       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0002r1.html">P0002R1</a></td>
 611       <td class="full" align="center">Clang 3.8</td>
 612     </tr>
 613     <tr>
 614       <td>Make exception specifications part of the type system</td>
 615       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0012r1.html">P0012R1</a></td>
 616       <td class="none" align="center">No</td>
 617     </tr>
 618     <tr>
 619       <td><tt>__has_include</tt> in preprocessor conditionals</td>
 620       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0061.html">P0061R1</a></td>
 621       <td class="full" align="center">Yes</td>
 622     </tr>
 623     <tr>
 624       <td>New specification for inheriting constructors (<a href="cxx_dr_status.html#1941">DR1941</a> et al)</td>
 625       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0136r1.html">P0136R1</a></td>
 626       <td class="none" align="center">No</td>
 627     </tr>
 628     <!-- Jacksonville papers -->
 629     <tr>
 630       <td><tt>[[fallthrough]]</tt> attribute</td>
 631       <td><a href="http://wg21.link/p0188r1">P0188R1</a></td>
 632       <td class="svn" align="center">SVN</td>
 633     </tr>
 634     <tr>
 635       <td><tt>[[nodiscard]]</tt> attribute</td>
 636       <td><a href="http://wg21.link/p0189r1">P0189R1</a></td>
 637       <td class="svn" align="center">SVN</td>
 638     </tr>
 639     <tr>
 640       <td><tt>[[maybe_unused]]</tt> attribute</td>
 641       <td><a href="http://wg21.link/p0212r1">P0212R1</a></td>
 642       <td class="svn" align="center">SVN</td>
 643     </tr>
 644     <tr>
 645       <td>Aggregate initialization of classes with base classes</td>
 646       <td><a href="http://wg21.link/p0017r1">P0017R1</a></td>
 647       <td class="svn" align="center">SVN</td>
 648     </tr>
 649     <tr>
 650       <td><tt>constexpr</tt> lambda expressions</td>
 651       <td><a href="http://wg21.link/p0170r1">P0170R1</a></td>
 652       <td class="none" align="center">No</td>
 653     </tr>
 654     <tr>
 655       <td>Differing <tt>begin</tt> and <tt>end</tt> types in range-based <tt>for</tt></td>
 656       <td><a href="http://wg21.link/p0184r0">P0184R0</a></td>
 657       <td class="svn" align="center">SVN</td>
 658     </tr>
 659     <tr>
 660       <td>Lambda capture of <tt>*this</tt></td>
 661       <td><a href="http://wg21.link/p0018r3">P0018R3</a></td>
 662       <td class="svn" align="center">SVN</td>
 663     </tr>
 664     <tr>
 665       <td>Direct-list-initialization of <tt>enum</tt>s</td>
 666       <td><a href="http://wg21.link/p0138r2">P0138R2</a></td>
 667       <td class="svn" align="center">SVN</td>
 668     </tr>
 669     <tr>
 670       <td>Hexadecimal floating-point literals</td>
 671       <td><a href="http://wg21.link/p0245r1">P0245R1</a></td>
 672       <td class="full" align="center">Yes</td>
 673     </tr>
 674     <!-- Oulu papers -->
 675     <tr>
 676       <td>Using attribute namespaces without repetition</td>
 677       <td><a href="http://wg21.link/p0028r4">P0028R4</a></td>
 678       <td class="svn" align="center">SVN</td>
 679     </tr>
 680     <tr>
 681       <td>Dynamic memory allocation for over-aligned data</td>
 682       <td><a href="http://wg21.link/p0035r4">P0035R4</a></td>
 683       <td class="none" align="center">No</td>
 684     </tr>
 685     <tr>
 686       <td>Template argument deduction for class templates</td>
 687       <td><a href="http://wg21.link/p0091r3">P0091R3</a></td>
 688       <td class="none" align="center">No</td>
 689     </tr>
 690     <tr>
 691       <td>Non-type template parameters with <tt>auto</tt> type</td>
 692       <td><a href="http://wg21.link/p0127r2">P0127R2</a></td>
 693       <td class="none" align="center">No</td>
 694     </tr>
 695     <tr>
 696       <td>Guaranteed copy elision</td>
 697       <td><a href="http://wg21.link/p0135r1">P0135R1</a></td>
 698       <td class="none" align="center">No</td>
 699     </tr>
 700     <tr>
 701       <td>Stricter expression evaluation order (chapter 8 alternative)</td>
 702       <td><a href="http://wg21.link/p0145r3">P0145R3</a></td>
 703       <td class="none" align="center">No</td>
 704     </tr>
 705     <tr>
 706       <td>Requirement to ignore unknown attributes</td>
 707       <td><a href="http://wg21.link/p0283r2">P0283R2</a></td>
 708       <td class="full" align="center">Yes</td>
 709     </tr>
 710     <tr>
 711       <td><tt>constexpr</tt> <em>if-statement</em>s</td>
 712       <td><a href="http://wg21.link/p0292r2">P0292R2</a></td>
 713       <td class="svn" align="center">SVN</td>
 714     </tr>
 715     <tr>
 716       <td>Inline variables</td>
 717       <td><a href="http://wg21.link/p0386r2">P0386R2</a></td>
 718       <td class="none" align="center">No</td>
 719     </tr>
 720     <tr>
 721       <td>Structured bindings</td>
 722       <td><a href="http://wg21.link/p0217r3">P0217R3</a></td>
 723       <td class="none" align="center">No</td>
 724     </tr>
 725     <tr>
 726       <td>Separate variable and condition for <tt>if</tt>, <tt>while</tt>, and <tt>switch</tt></td>
 727       <td><a href="http://wg21.link/p0305r1">P0305R1</a></td>
 728       <td class="none" align="center">No</td>
 729     </tr>
 730 </table>
 731
 732 <p>
 733 <span id="n3922">(8): This is a backwards-incompatible change that is applied to
 734 all language versions that allow type deduction from <tt>auto</tt>
 735 (per the request of the C++ committee).
 736 In Clang 3.7, a warning is emitted for all cases that would change meaning.
 737 </span>
 738 </p>
 739
 740 <h2 id="ts">Technical specifications and standing documents</h2>
 741
 742 <p>ISO C++ also publishes a number of documents describing additional language
 743 and library features that are not part of standard C++. The following table
 744 describes which language features have been implemented in Clang and in which
 745 Clang version they became available:</p>
 746
 747 <table width="689" border="1" cellspacing="0">
 748  <tr>
 749     <th>Document</th>
 750     <th>Latest draft</th>
 751     <th>Available in Clang?</th>
 752  </tr>
 753     <tr>
 754       <td rowspan="2">SD-6: SG10 feature test recommendations</td>
 755       <td rowspan="2"><a href="http://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6</a></td>
 756       <td class="full" align="center">
 757         Clang 3.4 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3745">N3745</a>)</br>
 758       </td>
 759     </tr>
 760     <tr>
 761       <td class="full" align="center">
 762         Clang 3.6 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4200">N4200</a>)</a>
 763       </td>
 764     </tr>
 765     <!-- FIXME: Implement latest recommendations.
 766     <tr>
 767       <td class="svn" align="center">
 768         SVN (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0096r0">P0096R0</a>)</a>
 769       </td>
 770     </tr>
 771     -->
 772     <!-- No compiler support is known to be needed for:
 773            * Concurrency TS
 774            * Parallelism TS
 775            * Ranges TS
 776            * Networking TS
 777            * File System TS
 778     -->
 779     <tr>
 780       <td>[TS] Concepts</td>
 781       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0121r0.pdf">P0121R0</a></td>
 782       <td class="none" align="center">No</td>
 783     </tr>
 784     <tr>
 785       <td>[TS] Library Fundamentals, Version 1 (invocation type traits)</td>
 786       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4480.html">N4480</a></td>
 787       <td class="none" align="center">No</td>
 788     </tr>
 789     <tr>
 790       <td>[DRAFT TS] Library Fundamentals, Version 2 (<tt>source_location</tt>)</td>
 791       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4529.html">N4529</a></td>
 792       <td class="none" align="center">No</td>
 793     </tr>
 794     <tr>
 795       <td>[TS] Modules</td>
 796       <td><a href="http://wg21.link/p0143r2">P0143R2</a></td>
 797       <td class="none" align="center">No</td>
 798     </tr>
 799     <tr>
 800       <td>[TS] Transactional Memory</td>
 801       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4514.pdf">N4514</a></td>
 802       <td class="none" align="center">No</td>
 803     </tr>
 804 </table>
 805
 806 </div>
 807 </body>
 808 </html>