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  25 <!--*************************************************************************-->
  26 <h1>C++ Support in Clang</h1>
  27 <!--*************************************************************************-->
  28 <p>Last updated: $Date: 2017-03-16 15:21:00 +0100 (Thu, 16 Mar 2017) $</p>
  29
  30 <p>Clang fully implements all published ISO C++ standards (<a
  31 href="#cxx98">C++98 / C++03</a>, <a
  32 href="#cxx11">C++11</a>, and <a
  33 href="#cxx14">C++14</a>), and most of the upcoming <a
  34 href="#cxx17">C++1z</a> standard.
  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/catalogue_detail.htm?csnumber=50372">ISO
  59   C++ 2011 standard</a>.
  60
  61 <p>By default, Clang builds C++ code according to the C++98 standard, with many
  62 C++11 features accepted as extensions. You can use Clang in C++11 mode with the
  63 <code>-std=c++11</code> option. Clang's C++11 mode can be used
  64 with <a href="http://libcxx.llvm.org/">libc++</a> or with gcc's libstdc++.
  65
  66 <details>
  67 <summary>List of features and minimum Clang version with support</summary>
  68
  69 <table width="689" border="1" cellspacing="0">
  70  <tr>
  71     <th>Language Feature</th>
  72     <th>C++11 Proposal</th>
  73     <th>Available in Clang?</th>
  74  </tr>
  75      <tr>
  76       <td>Rvalue references</td>
  77       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2118.html">N2118</a></td>
  78       <td class="full" align="center">Clang 2.9</td>
  79     </tr>
  80     <tr>
  81       <td>&nbsp;&nbsp;&nbsp;&nbsp;Rvalue references for <code>*this</code></td>
  82       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2439.htm">N2439</a></td>
  83       <td class="full" align="center">Clang 2.9</td>
  84     </tr>
  85     <tr>
  86       <td>Initialization of class objects by rvalues</td>
  87       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1610.html">N1610</a></td>
  88       <td class="full" align="center">Clang 2.9</td>
  89     </tr>
  90     <tr>
  91       <td>Non-static data member initializers</td>
  92       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2008/n2756.htm">N2756</a></td>
  93       <td class="full" align="center">Clang 3.0</td>
  94     </tr>
  95     <tr>
  96       <td>Variadic templates</td>
  97       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2242.pdf">N2242</a></td>
  98       <td class="full" align="center">Clang 2.9</td>
  99     </tr>
 100     <tr>
 101       <td>&nbsp;&nbsp;&nbsp;&nbsp;Extending variadic template template parameters</td>
 102       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2555.pdf">N2555</a></td>
 103       <td class="full" align="center">Clang 2.9</td>
 104     </tr>
 105     <tr>
 106       <td>Initializer lists</td>
 107       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2672.htm">N2672</a></td>
 108       <td class="full" align="center">Clang 3.1</td>
 109     </tr>
 110     <tr>
 111       <td>Static assertions</td>
 112       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.html">N1720</a></td>
 113       <td class="full" align="center">Clang 2.9</td>
 114     </tr>
 115     <tr>
 116       <td><code>auto</code>-typed variables</td>
 117       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf">N1984</a></td>
 118       <td class="full" align="center">Clang 2.9</td>
 119     </tr>
 120     <tr>
 121       <td>&nbsp;&nbsp;&nbsp;&nbsp;Multi-declarator <code>auto</code></td>
 122       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1737.pdf">N1737</a></td>
 123       <td class="full" align="center">Clang 2.9</td>
 124     </tr>
 125     <tr>
 126       <td>&nbsp;&nbsp;&nbsp;&nbsp;Removal of auto as a storage-class specifier</td>
 127       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2546.htm">N2546</a></td>
 128       <td class="full" align="center">Clang 2.9</td>
 129     </tr>
 130     <tr>
 131       <td>&nbsp;&nbsp;&nbsp;&nbsp;New function declarator syntax</td>
 132       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2541.htm">N2541</a></td>
 133       <td class="full" align="center">Clang 2.9</td>
 134     </tr>
 135     <tr>
 136       <td>Lambda expressions</td>
 137       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2927.pdf">N2927</a></td>
 138       <td class="full" align="center">Clang 3.1</td>
 139     </tr>
 140     <tr>
 141       <td>Declared type of an expression</td>
 142       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a></td>
 143       <td class="full" align="center">Clang 2.9</td>
 144     </tr>
 145     <tr>
 146       <td>&nbsp;&nbsp;&nbsp;&nbsp;Incomplete return types</td>
 147       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3276.pdf">N3276</a></td>
 148       <td class="full" align="center">Clang 3.1</td>
 149     </tr>
 150     <tr>
 151       <td>Right angle brackets</td>
 152       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a></td>
 153       <td class="full" align="center">Clang 2.9</td>
 154     </tr>
 155     <tr>
 156       <td>Default template arguments for function templates</td>
 157       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#226">DR226</a></td>
 158       <td class="full" align="center">Clang 2.9</td>
 159     </tr>
 160     <tr>
 161       <td>Solving the SFINAE problem for expressions</td>
 162       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2634.html">DR339</a></td>
 163       <td class="full" align="center">Clang 2.9</td>
 164     </tr>
 165     <tr>
 166       <td>Alias templates</td>
 167       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf">N2258</a></td>
 168       <td class="full" align="center">Clang 3.0</td>
 169     </tr>
 170     <tr>
 171       <td>Extern templates</td>
 172       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1987.htm">N1987</a></td>
 173       <td class="full" align="center">Clang 2.9</td>
 174     </tr>
 175     <tr>
 176       <td>Null pointer constant</td>
 177       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a></td>
 178       <td class="full" align="center">Clang 3.0</td>
 179     </tr>
 180     <tr>
 181       <td>Strongly-typed enums</td>
 182       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf">N2347</a></td>
 183       <td class="full" align="center">Clang 2.9</td>
 184     </tr>
 185     <tr>
 186       <td>Forward declarations for enums</td>
 187       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2764.pdf">N2764</a>
 188       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1206">DR1206</a></td>
 189       <td class="full" align="center">Clang 3.1</td>
 190     </tr>
 191     <tr>
 192       <td>Standardized attribute syntax</td>
 193       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2761.pdf">N2761</a></td>
 194       <td class="full" align="center">Clang 3.3 <a href="#n2761">(1)</a></td>
 195     </tr>
 196     <tr>
 197       <td>Generalized constant expressions</td>
 198       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf">N2235</a></td>
 199       <td class="full" align="center">Clang 3.1</td>
 200     </tr>
 201     <tr>
 202       <td>Alignment support</td>
 203       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf">N2341</a></td>
 204       <td class="full" align="center">Clang 3.3</td>
 205     </tr>
 206     <tr>
 207       <td>Conditionally-support behavior</td>
 208       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1627.pdf">N1627</a></td>
 209       <td class="full" align="center">Clang 2.9</td>
 210     </tr>
 211     <tr>
 212       <td>Changing undefined behavior into diagnosable errors</td>
 213       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1727.pdf">N1727</a></td>
 214       <td class="full" align="center">Clang 2.9</td>
 215     </tr>
 216     <tr>
 217       <td>Delegating constructors</td>
 218       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf">N1986</a></td>
 219       <td class="full" align="center">Clang 3.0</td>
 220     </tr>
 221     <tr>
 222       <td>Inheriting constructors</td>
 223       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2540.htm">N2540</a></td>
 224       <td class="full" align="center">Clang 3.3</td>
 225     </tr>
 226     <tr>
 227       <td>Explicit conversion operators</td>
 228       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a></td>
 229       <td class="full" align="center">Clang 3.0</td>
 230     </tr>
 231     <tr>
 232       <td>New character types</td>
 233       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2249.html">N2249</a></td>
 234       <td class="full" align="center">Clang 2.9</td>
 235     </tr>
 236     <tr>
 237       <td>Unicode string literals</td>
 238       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
 239       <td class="full" align="center">Clang 3.0</td>
 240     </tr>
 241     <tr>
 242       <td>Raw string literals</td>
 243       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
 244       <td class="full" align="center">Clang 3.0</td>
 245     </tr>
 246     <tr>
 247       <td>Universal character names in literals</td>
 248       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2170.html">N2170</a></td>
 249       <td class="full" align="center">Clang 3.1</td>
 250     </tr>
 251     <tr>
 252       <td>User-defined literals</td>
 253       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2765.pdf">N2765</a></td>
 254       <td class="full" align="center">Clang 3.1</td>
 255     </tr>
 256     <tr>
 257       <td>Standard Layout Types</td>
 258       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2342.htm">N2342</a></td>
 259       <td class="full" align="center">Clang 3.0</td>
 260     </tr>
 261     <tr>
 262       <td>Defaulted functions</td>
 263       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
 264       <td class="full" align="center">Clang 3.0</td>
 265     </tr>
 266     <tr>
 267       <td>Deleted functions</td>
 268       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
 269       <td class="full" align="center">Clang 2.9</td>
 270     </tr>
 271     <tr>
 272       <td>Extended friend declarations</td>
 273       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1791.pdf">N1791</a></td>
 274       <td class="full" align="center">Clang 2.9</td>
 275     </tr>
 276     <tr>
 277       <td>Extending <code>sizeof</code></td>
 278       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2253.html">N2253</a>
 279       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#850">DR850</a></td>
 280       <td class="full" align="center">Clang 3.1</td>
 281     </tr>
 282     <tr>
 283       <td>Inline namespaces</td>
 284       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2535.htm">N2535</a></td>
 285       <td class="full" align="center">Clang 2.9</td>
 286     </tr>
 287     <tr>
 288       <td>Unrestricted unions</td>
 289       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2544.pdf">N2544</a></td>
 290       <td class="full" align="center">Clang 3.1</td>
 291     </tr>
 292     <tr>
 293       <td>Local and unnamed types as template arguments</td>
 294       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm">N2657</a></td>
 295       <td class="full" align="center">Clang 2.9</td>
 296     </tr>
 297     <tr>
 298       <td>Range-based for</td>
 299       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2930.html">N2930</a></td>
 300       <td class="full" align="center">Clang 3.0</td>
 301     </tr>
 302     <tr>
 303       <td>Explicit virtual overrides</td>
 304       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2928.htm">N2928</a>
 305       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3206.htm">N3206</a>
 306       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3272.htm">N3272</a></td>
 307       <td class="full" align="center">Clang 3.0</td>
 308     </tr>
 309     <tr>
 310       <td>Minimal support for garbage collection and reachability-based leak detection</td>
 311       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2670.htm">N2670</a></td>
 312       <td class="na" align="center">N/A <a href="#n2670">(2)</a></td>
 313     </tr>
 314     <tr>
 315       <td>Allowing move constructors to throw [noexcept]</td>
 316       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3050.html">N3050</a></td>
 317       <td class="full" align="center">Clang 3.0</td>
 318     </tr>
 319     <tr>
 320       <td>Defining move special member functions</td>
 321       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3053.html">N3053</a></td>
 322       <td class="full" align="center">Clang 3.0</td>
 323     </tr>
 324
 325     <tr class="separator">
 326       <th align="center" colspan="3">Concurrency</th>
 327     </tr>
 328     <tr>
 329       <td>Sequence points</td>
 330       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2239.html">N2239</a></td>
 331       <td class="full" align="center">Clang 3.3</td>
 332     </tr>
 333     <tr>
 334       <td>Atomic operations</td>
 335       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html">N2427</a></td>
 336       <td class="full" align="center">Clang 3.1</td>
 337     </tr>
 338     <tr>
 339       <td>Strong Compare and Exchange</td>
 340       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2748.html">N2748</a></td>
 341       <td class="full" align="center">Clang 3.1 <a href="#n2748">(3)</a></td>
 342     </tr>
 343     <tr>
 344       <td>Bidirectional Fences</td>
 345       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2752.htm">N2752</a></td>
 346       <td class="full" align="center">Clang 3.1</td>
 347     </tr>
 348
 349     <tr>
 350       <td>Memory model</td>
 351       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2429.htm">N2429</a></td>
 352       <td class="full" align="center">Clang 3.2</td>
 353     </tr>
 354     <tr>
 355       <td>Data-dependency ordering: atomics and memory model</td>
 356       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2664.htm">N2664</a></td>
 357       <td class="full" align="center">Clang 3.2 <a href="#n2664">(4)</a></td>
 358     </tr>
 359     <tr>
 360       <td>Propagating exceptions</td>
 361       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html">N2179</a></td>
 362       <td class="full" align="center">Clang 2.9</td>
 363     </tr>
 364     <tr>
 365       <td>Allow atomics use in signal handlers</td>
 366       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2547.htm">N2547</a></td>
 367       <td class="full" align="center">Clang 3.1</td>
 368     </tr>
 369     <tr>
 370       <td>Thread-local storage</td>
 371       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2659.htm">N2659</a></td>
 372       <td class="full" align="center">Clang 3.3 <a href="#n2659">(5)</a></td>
 373     </tr>
 374     <tr>
 375       <td>Dynamic initialization and destruction with concurrency</td>
 376       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">N2660</a></td>
 377       <td class="full" align="center">Clang 2.9</td>
 378     </tr>
 379
 380     <tr class="separator">
 381       <th align="center" colspan="3">C99 Features in C++11</th>
 382     </tr>
 383     <tr>
 384       <td><code>__func__</code> predefined identifier</td>
 385       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2340.htm">N2340</a></td>
 386       <td class="full" align="center">Clang 2.9</td>
 387     </tr>
 388     <tr>
 389       <td>C99 preprocessor</td>
 390       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1653.htm">N1653</a></td>
 391       <td class="full" align="center">Clang 2.9</td>
 392     </tr>
 393     <tr>
 394       <td><code>long long</code></td>
 395       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1811.pdf">N1811</a></td>
 396       <td class="full" align="center">Clang 2.9</td>
 397     </tr>
 398     <tr>
 399       <td>Extended integral types</td>
 400       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1988.pdf">N1988</a></td>
 401       <td class="na" align="center">N/A <a href="#n1988">(6)</a></td>
 402     </tr>
 403 </table>
 404
 405 <p>
 406 <span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute
 407 has no effect.</span><br>
 408 <span id="n2670">(2): No compiler changes are required for an implementation
 409 such as Clang that does not provide garbage collection.</span><br>
 410 <span id="n2748">(3): All compare-exchange operations are emitted as
 411 strong compare-exchanges.</span><br>
 412 <span id="n2664">(4): <code>memory_order_consume</code> is lowered to
 413 <code>memory_order_acquire</code>.</span><br>
 414 <span id="n2659">(5): <code>thread_local</code> support
 415 requires a C++ runtime library providing <code>__cxa_thread_atexit</code>, such
 416 as <a href="http://libcxxabi.llvm.org">libc++abi</a> 3.6 or later,
 417 or libsupc++ 4.8 or later.</span><br>
 418 <span id="n1988">(6): 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 </details>
 425
 426 <h2 id="cxx14">C++14 implementation status</h2>
 427
 428 <p>Clang 3.4 and later implement all of the <a
 429     href="http://www.iso.org/iso/catalogue_detail.htm?csnumber=64029">ISO
 430     C++ 2014 standard</a>.
 431
 432 <p>You can use Clang in C++14 mode with the <code>-std=c++14</code> option
 433 (use <code>-std=c++1y</code> in Clang 3.4 and earlier).</p>
 434
 435 <details>
 436 <summary>List of features and minimum Clang version with support</summary>
 437
 438 <table width="689" border="1" cellspacing="0">
 439  <tr>
 440     <th>Language Feature</th>
 441     <th>C++14 Proposal</th>
 442     <th>Available in Clang?</th>
 443  </tr>
 444     <tr>
 445       <td>Tweak to certain C++ contextual conversions</td>
 446       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3323.pdf">N3323</a></td>
 447       <td class="full" align="center">Clang 3.4</td>
 448     </tr>
 449     <tr>
 450       <td>Binary literals</td>
 451       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3472.pdf">N3472</a></td>
 452       <td class="full" align="center">Clang 2.9</td>
 453     </tr>
 454     <tr>
 455       <td>decltype(auto)</td>
 456       <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>
 457       <td class="full" align="center">Clang 3.3</td>
 458     </tr>
 459     <tr>
 460       <td>Return type deduction for normal functions</td>
 461       <td class="full" align="center">Clang 3.4</td>
 462     </tr>
 463     <tr>
 464       <td>Initialized lambda captures</td>
 465       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3648.html">N3648</a></td>
 466       <td class="full" align="center">Clang 3.4</td>
 467     </tr>
 468     <tr>
 469       <td>Generic lambdas</td>
 470       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3649.html">N3649</a></td>
 471       <td class="full" align="center">Clang 3.4</td>
 472     </tr>
 473     <tr>
 474       <td>Variable templates</td>
 475       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3651.pdf">N3651</a></td>
 476       <td class="full" align="center">Clang 3.4</td>
 477     </tr>
 478     <tr>
 479       <td>Relaxing requirements on constexpr functions</td>
 480       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3652.html">N3652</a></td>
 481       <td class="full" align="center">Clang 3.4</td>
 482     </tr>
 483     <tr>
 484       <td>Member initializers and aggregates</td>
 485       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3653.html">N3653</a></td>
 486       <td class="full" align="center">Clang 3.3</td>
 487     </tr>
 488     <tr>
 489       <td>Clarifying memory allocation</td>
 490       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3664.html">N3664</a></td>
 491       <td class="full" align="center">Clang 3.4</td>
 492     </tr>
 493     <tr>
 494       <td><tt>[[deprecated]]</tt> attribute</td>
 495       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3760.html">N3760</a></td>
 496       <td class="full" align="center">Clang 3.4</td>
 497     </tr>
 498     <tr>
 499       <td>Single quotation mark as digit separator</td>
 500       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3781.pdf">N3781</a></td>
 501       <td class="full" align="center">Clang 3.4</td>
 502     </tr>
 503     <tr>
 504       <td>C++ Sized Deallocation</td>
 505       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3778.html">N3778</a></td>
 506       <td class="full" align="center">Clang 3.4 <a href="#n3778">(7)</a></td>
 507     </tr>
 508 </table>
 509
 510 <p>
 511 <span id="n3778">(7): In Clang 3.7 and later, sized deallocation is only enabled
 512 if the user passes the <code>-fsized-deallocation</code> flag. The user must
 513 supply definitions of the sized deallocation functions, either by providing them
 514 explicitly or by using a C++ standard library that does. <code>libstdc++</code>
 515 added these functions in version 5.0, and <code>libc++</code> added them in
 516 version 3.7.
 517 </span>
 518 </p>
 519 </details>
 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 Note that support for these features may change or be removed without notice,
 526 as the draft C++1z standard evolves.
 527
 528 <p>You can use Clang in C++1z mode with the <code>-std=c++1z</code> option.</p>
 529
 530 <details open>
 531 <summary>List of features and minimum Clang version with support</summary>
 532
 533 <table width="689" border="1" cellspacing="0">
 534  <tr>
 535     <th>Language Feature</th>
 536     <th>C++1z Proposal</th>
 537     <th>Available in Clang?</th>
 538  </tr>
 539     <!-- Issaquah 2014 papers -->
 540     <tr>
 541       <td><tt>static_assert</tt> with no message</td>
 542       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3928.pdf">N3928</a></td>
 543       <td class="full" align="center">Clang 3.5</td>
 544     </tr>
 545     <!-- Rapperswil papers -->
 546     <tr>
 547       <td>Disabling trigraph expansion by default</td>
 548       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4086.html">N4086</a></td>
 549       <td class="full" align="center">Clang 3.5</td>
 550     </tr>
 551     <!--
 552     <tr>
 553       <td rowspan="2">Terse range-based for loops (removed from C++1z)</td>
 554       <td rowspan="2"><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3994.htm">N3994</a></td>
 555       <td class="none" align="center">Clang 3.5: Yes</td>
 556     </tr>
 557     <tr>
 558       <td class="svn" align="center">SVN: No</td>
 559     </tr>
 560     -->
 561     <tr>
 562       <td><tt>typename</tt> in a template template parameter</td>
 563       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4051.html">N4051</a></td>
 564       <td class="full" align="center">Clang 3.5</td>
 565     </tr>
 566     <tr>
 567       <td>New <tt>auto</tt> rules for direct-list-initialization
 568       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3922.html">N3922</a></td>
 569       <td class="full" align="center">Clang 3.8 <a href="#n3922">(8)</a></td>
 570     </tr>
 571     <!-- Urbana papers -->
 572     <tr>
 573       <td rowspan="2">Fold expressions</td>
 574       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4295.html">N4295</a></td>
 575       <td class="full" align="center">Clang 3.6</td>
 576     </tr>
 577       <tr> <!-- from Jacksonville -->
 578         <td><a href="http://wg21.link/p0036r0">P0036R0</a></td>
 579         <td class="full" align="center">Clang 3.9</td>
 580       </tr>
 581     <tr>
 582       <td><tt>u8</tt> character literals</td>
 583       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4267.html">N4267</a></td>
 584       <td class="full" align="center">Clang 3.6</td>
 585     </tr>
 586     <tr>
 587       <td>Nested namespace definition</td>
 588       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4230.html">N4230</a></td>
 589       <td class="full" align="center">Clang 3.6</td>
 590     </tr>
 591     <tr>
 592       <td>Attributes for namespaces and enumerators</td>
 593       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4266.html">N4266</a></td>
 594       <td class="full" align="center">Clang 3.6</td>
 595     </tr>
 596     <tr>
 597       <td>Allow constant evaluation for all non-type template arguments</td>
 598       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4268.html">N4268</a></td>
 599       <td class="full" align="center">Clang 3.6</td>
 600     </tr>
 601     <!-- Kona papers -->
 602     <tr>
 603       <td>Remove deprecated <tt>register</tt> storage class</td>
 604       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0001r1.html">P0001R1</a></td>
 605       <td class="full" align="center">Clang 3.8</td>
 606     </tr>
 607     <tr>
 608       <td>Remove deprecated <tt>bool</tt> increment</td>
 609       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0002r1.html">P0002R1</a></td>
 610       <td class="full" align="center">Clang 3.8</td>
 611     </tr>
 612     <tr>
 613       <td>Make exception specifications part of the type system</td>
 614       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0012r1.html">P0012R1</a></td>
 615       <td class="full" align="center">Clang 4</td>
 616     </tr>
 617     <tr>
 618       <td><tt>__has_include</tt> in preprocessor conditionals</td>
 619       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0061.html">P0061R1</a></td>
 620       <td class="full" align="center">Yes</td>
 621     </tr>
 622     <tr>
 623       <td>New specification for inheriting constructors (<a href="cxx_dr_status.html#1941">DR1941</a> et al)</td>
 624       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0136r1.html">P0136R1</a></td>
 625       <td class="full" align="center">Clang 3.9 <a href="#p0136">(9)</a></td>
 626     </tr>
 627     <!-- Jacksonville papers -->
 628     <tr>
 629       <td><tt>[[fallthrough]]</tt> attribute</td>
 630       <td><a href="http://wg21.link/p0188r1">P0188R1</a></td>
 631       <td class="full" align="center">Clang 3.9</td>
 632     </tr>
 633     <tr>
 634       <td><tt>[[nodiscard]]</tt> attribute</td>
 635       <td><a href="http://wg21.link/p0189r1">P0189R1</a></td>
 636       <td class="full" align="center">Clang 3.9</td>
 637     </tr>
 638     <tr>
 639       <td><tt>[[maybe_unused]]</tt> attribute</td>
 640       <td><a href="http://wg21.link/p0212r1">P0212R1</a></td>
 641       <td class="full" align="center">Clang 3.9</td>
 642     </tr>
 643     <tr>
 644       <td>Aggregate initialization of classes with base classes</td>
 645       <td><a href="http://wg21.link/p0017r1">P0017R1</a></td>
 646       <td class="full" align="center">Clang 3.9</td>
 647     </tr>
 648     <tr>
 649       <td><tt>constexpr</tt> lambda expressions</td>
 650       <td><a href="http://wg21.link/p0170r1">P0170R1</a></td>
 651       <td class="svn" align="center">SVN</td>
 652     </tr>
 653     <tr>
 654       <td>Differing <tt>begin</tt> and <tt>end</tt> types in range-based <tt>for</tt></td>
 655       <td><a href="http://wg21.link/p0184r0">P0184R0</a></td>
 656       <td class="full" align="center">Clang 3.9</td>
 657     </tr>
 658     <tr>
 659       <td>Lambda capture of <tt>*this</tt></td>
 660       <td><a href="http://wg21.link/p0018r3">P0018R3</a></td>
 661       <td class="full" align="center">Clang 3.9</td>
 662     </tr>
 663     <tr>
 664       <td>Direct-list-initialization of <tt>enum</tt>s</td>
 665       <td><a href="http://wg21.link/p0138r2">P0138R2</a></td>
 666       <td class="full" align="center">Clang 3.9</td>
 667     </tr>
 668     <tr>
 669       <td>Hexadecimal floating-point literals</td>
 670       <td><a href="http://wg21.link/p0245r1">P0245R1</a></td>
 671       <td class="full" align="center">Yes</td>
 672     </tr>
 673     <!-- Oulu papers -->
 674     <tr>
 675       <td>Using attribute namespaces without repetition</td>
 676       <td><a href="http://wg21.link/p0028r4">P0028R4</a></td>
 677       <td class="full" align="center">Clang 3.9</td>
 678     </tr>
 679     <tr>
 680       <td>Dynamic memory allocation for over-aligned data</td>
 681       <td><a href="http://wg21.link/p0035r4">P0035R4</a></td>
 682       <td class="full" align="center">Clang 4</td>
 683     </tr>
 684     <tr>
 685       <td rowspan="2">Template argument deduction for class templates</td>
 686       <td><a href="http://wg21.link/p0091r3">P0091R3</a></td>
 687       <td rowspan="2" class="svn" align="center">SVN</td>
 688     </tr>
 689       <tr> <!-- from Issaquah -->
 690         <td><a href="http://wg21.link/p0512r0">P0512R0</a></td>
 691       </tr>
 692     <tr>
 693       <td>Non-type template parameters with <tt>auto</tt> type</td>
 694       <td><a href="http://wg21.link/p0127r2">P0127R2</a></td>
 695       <td class="full" align="center">Clang 4</td>
 696     </tr>
 697     <tr>
 698       <td>Guaranteed copy elision</td>
 699       <td><a href="http://wg21.link/p0135r1">P0135R1</a></td>
 700       <td class="full" align="center">Clang 4</td>
 701     </tr>
 702     <tr>
 703       <td rowspan=2>Stricter expression evaluation order</td>
 704       <td><a href="http://wg21.link/p0145r3">P0145R3</a></td>
 705       <td class="full" align="center" rowspan=2>Clang 4 <a href="#p0145">(10)</a></td>
 706     </tr>
 707     <tr>
 708       <td><a href="http://wg21.link/p0400r0">P0400R0</a></td>
 709     </tr>
 710     <tr>
 711       <td>Requirement to ignore unknown attributes</td>
 712       <td><a href="http://wg21.link/p0283r2">P0283R2</a></td>
 713       <td class="full" align="center">Yes</td>
 714     </tr>
 715     <tr>
 716       <td><tt>constexpr</tt> <em>if-statement</em>s</td>
 717       <td><a href="http://wg21.link/p0292r2">P0292R2</a></td>
 718       <td class="full" align="center">Clang 3.9</td>
 719     </tr>
 720     <tr>
 721       <td>Inline variables</td>
 722       <td><a href="http://wg21.link/p0386r2">P0386R2</a></td>
 723       <td class="full" align="center">Clang 3.9</td>
 724     </tr>
 725     <tr>
 726       <td>Structured bindings</td>
 727       <td><a href="http://wg21.link/p0217r3">P0217R3</a></td>
 728       <td class="full" align="center">Clang 4</td>
 729     </tr>
 730     <tr>
 731       <td>Separate variable and condition for <tt>if</tt> and <tt>switch</tt></td>
 732       <td><a href="http://wg21.link/p0305r1">P0305R1</a></td>
 733       <td class="full" align="center">Clang 3.9</td>
 734     </tr>
 735     <!-- Issaquah 2016 papers -->
 736     <tr>
 737       <td>Matching template template parameters to compatible arguments</td>
 738       <td><a href="http://wg21.link/p0522r0">P0522R0</a></td>
 739       <td class="partial" align="center">Partial <a href="#p0522">(12)</a></td>
 740     </tr>
 741     <tr>
 742       <td>Removing deprecated dynamic exception specifications</td>
 743       <td><a href="http://wg21.link/p0003r5">P0003R5</a></td>
 744       <td class="full" align="center">Clang 4</td>
 745     </tr>
 746     <tr>
 747       <td>Pack expansions in <em>using-declarations</em></td>
 748       <td><a href="http://wg21.link/p0195r2">P0195R2</a></td>
 749       <td class="full" align="center">Clang 4</td>
 750     </tr>
 751 </table>
 752
 753 <p>
 754 <span id="n3922">(8): This is a backwards-incompatible change that is applied to
 755 all language versions that allow type deduction from <tt>auto</tt>
 756 (per the request of the C++ committee).
 757 In Clang 3.7, a warning is emitted for all cases that would change meaning.
 758 </span><br>
 759 <span id="p0136">(9): This is the resolution to a Defect Report, so is applied
 760 to all language versions supporting inheriting constructors.
 761 </span><br>
 762 <span id="p0145">(10): Under the MS ABI, function parameters are destroyed from
 763 left to right in the callee. As a result, function parameters in calls to
 764 <tt>operator&lt;&lt;</tt>, <tt>operator&gt;&gt;</tt>, <tt>operator-&gt;*</tt>,
 765 <tt>operator&amp;&amp;</tt>, <tt>operator||</tt>, and <tt>operator,</tt>
 766 functions using expression syntax are no longer guaranteed to be destroyed in
 767 reverse construction order in that ABI.
 768 </span><br>
 769 <span id="p0522">(12): Despite being the the resolution to a Defect Report, this
 770 feature is disabled by default in all language versions, and can be enabled
 771 explicitly with the flag <tt>-frelaxed-template-template-args</tt> in Clang 4.
 772 The change to the standard lacks a corresponding change for template partial
 773 ordering, resulting in ambiguity errors for reasonable and previously-valid
 774 code. This issue is expected to be rectified soon.
 775 </span>
 776 </p>
 777 </details>
 778
 779 <h2 id="ts">Technical specifications and standing documents</h2>
 780
 781 <p>ISO C++ also publishes a number of documents describing additional language
 782 and library features that are not part of standard C++.</p>
 783
 784 <details open>
 785 <summary>List of features and minimum Clang version with support</summary>
 786
 787 <table width="689" border="1" cellspacing="0">
 788  <tr>
 789     <th>Document</th>
 790     <th>Latest draft</th>
 791     <th>Compiler flag</th>
 792     <th>Available in Clang?</th>
 793  </tr>
 794     <tr>
 795       <td rowspan="3">SD-6: SG10 feature test recommendations</td>
 796       <td rowspan="3"><a href="http://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6</a></td>
 797       <td rowspan="3">N/A</td>
 798       <td class="full" align="center">
 799         Clang 3.4 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3745">N3745</a>)</br>
 800       </td>
 801     </tr>
 802     <tr>
 803       <td class="full" align="center">
 804         Clang 3.6 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4200">N4200</a>)</a>
 805       </td>
 806     </tr>
 807     <tr>
 808       <td class="full" align="center">
 809         Clang 4 (<a href="http://wg21.link/p0096r3">P0096R3</a>)</a>
 810       </td>
 811     </tr>
 812     <!-- FIXME: Implement latest recommendations.
 813     <tr>
 814       <td class="svn" align="center">
 815         SVN (<a href="http://wg21.link/p0096r3">P0096R3</a>)</a>
 816       </td>
 817     </tr>
 818     -->
 819     <!-- No compiler support is known to be needed for:
 820            * Concurrency TS
 821            * Parallelism TS
 822            * Ranges TS
 823            * Networking TS
 824            * File System TS
 825     -->
 826     <tr>
 827       <td>[TS] Concepts</td>
 828       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0121r0.pdf">P0121R0</a></td>
 829       <td></td>
 830       <td class="none" align="center">WIP</td>
 831     </tr>
 832     <tr>
 833       <td>[DRAFT TS] Coroutines</td>
 834       <td><a href="http://wg21.link/p0057r7">P0057R7</a></td>
 835       <td></td>
 836       <td class="none" align="center">WIP</td>
 837     </tr>
 838     <tr>
 839       <td>[TS] Library Fundamentals, Version 1 (invocation type traits)</td>
 840       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4480.html">N4480</a></td>
 841       <td>N/A</td>
 842       <td class="none" align="center">No</td>
 843     </tr>
 844     <tr>
 845       <td>[DRAFT TS] Library Fundamentals, Version 2 (<tt>source_location</tt>)</td>
 846      <td><a href="http://wg21.link/n4600">N4600</a></td>
 847       <td>N/A</td>
 848       <td class="none" align="center">No</td>
 849     </tr>
 850     <tr>
 851       <td>[DRAFT TS] Modules</td>
 852       <td><a href="http://wg21.link/n4592">N4592</a></td>
 853       <td><tt>-fmodules-ts</tt></td>
 854       <td class="none" align="center">WIP</td>
 855     </tr>
 856     <tr>
 857       <td>[TS] Transactional Memory</td>
 858       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4514.pdf">N4514</a></td>
 859       <td></td>
 860       <td class="none" align="center">No</td>
 861     </tr>
 862 </table>
 863 </details>
 864
 865 </div>
 866 </body>
 867 </html>