granicus.if.org Git - clang/blob - www/cxx_status.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4   <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
   5   <title>Clang - C++1z, C++14, C++11 and C++98 Status</title>
   6   <link type="text/css" rel="stylesheet" href="menu.css">
   7   <link type="text/css" rel="stylesheet" href="content.css">
   8   <style type="text/css">
   9     .none { background-color: #FFCCCC }
  10     .partial { background-color: #FFE0B0 }
  11     .svn  { background-color: #FFFF99 }
  12     .full { background-color: #CCFF99 }
  13     .na { background-color: #DDDDDD }
  14     span:target { background-color: #FFFFBB; outline: #DDDD55 solid thin; }
  15     th { background-color: #FFDDAA }
  16     td { vertical-align: middle }
  17     tt { white-space: nowrap }
  18   </style>
  19 </head>
  20 <body>
  21
  22 <!--#include virtual="menu.html.incl"-->
  23
  24 <div id="content">
  25
  26 <!--*************************************************************************-->
  27 <h1>C++ Support in Clang</h1>
  28 <!--*************************************************************************-->
  29 <p>Last updated: $Date$</p>
  30
  31 <p>Clang fully implements all published ISO C++ standards (<a
  32 href="#cxx98">C++98 / C++03</a>, <a
  33 href="#cxx11">C++11</a>, and <a
  34 href="#cxx14">C++14</a>), and most of the upcoming <a
  35 href="#cxx17">C++1z</a> standard.
  36
  37 <p>The Clang community is continually striving to improve C++ standards
  38 compliance between releases by submitting and tracking <a
  39 href="cxx_dr_status.html">C++ Defect Reports</a> and implementing resolutions
  40 as they become available.</p>
  41
  42 <p>Experimental work is also under way to implement <a href="#ts">C++ Technical
  43 Specifications</a> that will help drive the future of the C++ programming
  44 language.</p>
  45
  46 <p>The <a href="http://llvm.org/bugs/">LLVM bug tracker</a> contains Clang
  47 C++ components that track known bugs with Clang's language conformance in
  48 each language mode.</p>
  49
  50 <h2 id="cxx98">C++98 implementation status</h2>
  51
  52 <p>Clang implements all of the ISO C++ 1998 standard
  53   (including the defects addressed in the ISO C++ 2003 standard)
  54   except for <tt>export</tt> (which was removed in C++11).
  55
  56 <h2 id="cxx11">C++11 implementation status</h2>
  57
  58 <p>Clang 3.3 and later implement all of the <a
  59   href="http://www.iso.org/iso/catalogue_detail.htm?csnumber=50372">ISO
  60   C++ 2011 standard</a>.
  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++.
  66
  67 <details>
  68 <summary>List of features and minimum Clang version with support</summary>
  69
  70 <table width="689" border="1" cellspacing="0">
  71  <tr>
  72     <th>Language Feature</th>
  73     <th>C++11 Proposal</th>
  74     <th>Available in Clang?</th>
  75  </tr>
  76      <tr>
  77       <td>Rvalue references</td>
  78       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2118.html">N2118</a></td>
  79       <td class="full" align="center">Clang 2.9</td>
  80     </tr>
  81     <tr>
  82       <td>&nbsp;&nbsp;&nbsp;&nbsp;Rvalue references for <code>*this</code></td>
  83       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2439.htm">N2439</a></td>
  84       <td class="full" align="center">Clang 2.9</td>
  85     </tr>
  86     <tr>
  87       <td>Initialization of class objects by rvalues</td>
  88       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1610.html">N1610</a></td>
  89       <td class="full" align="center">Clang 2.9</td>
  90     </tr>
  91     <tr>
  92       <td>Non-static data member initializers</td>
  93       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2008/n2756.htm">N2756</a></td>
  94       <td class="full" align="center">Clang 3.0</td>
  95     </tr>
  96     <tr>
  97       <td>Variadic templates</td>
  98       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2242.pdf">N2242</a></td>
  99       <td class="full" align="center">Clang 2.9</td>
 100     </tr>
 101     <tr>
 102       <td>&nbsp;&nbsp;&nbsp;&nbsp;Extending variadic template template parameters</td>
 103       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2555.pdf">N2555</a></td>
 104       <td class="full" align="center">Clang 2.9</td>
 105     </tr>
 106     <tr>
 107       <td>Initializer lists</td>
 108       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2672.htm">N2672</a></td>
 109       <td class="full" align="center">Clang 3.1</td>
 110     </tr>
 111     <tr>
 112       <td>Static assertions</td>
 113       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.html">N1720</a></td>
 114       <td class="full" align="center">Clang 2.9</td>
 115     </tr>
 116     <tr>
 117       <td><code>auto</code>-typed variables</td>
 118       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf">N1984</a></td>
 119       <td class="full" align="center">Clang 2.9</td>
 120     </tr>
 121     <tr>
 122       <td>&nbsp;&nbsp;&nbsp;&nbsp;Multi-declarator <code>auto</code></td>
 123       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1737.pdf">N1737</a></td>
 124       <td class="full" align="center">Clang 2.9</td>
 125     </tr>
 126     <tr>
 127       <td>&nbsp;&nbsp;&nbsp;&nbsp;Removal of auto as a storage-class specifier</td>
 128       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2546.htm">N2546</a></td>
 129       <td class="full" align="center">Clang 2.9</td>
 130     </tr>
 131     <tr>
 132       <td>&nbsp;&nbsp;&nbsp;&nbsp;New function declarator syntax</td>
 133       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2541.htm">N2541</a></td>
 134       <td class="full" align="center">Clang 2.9</td>
 135     </tr>
 136     <tr>
 137       <td>Lambda expressions</td>
 138       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2927.pdf">N2927</a></td>
 139       <td class="full" align="center">Clang 3.1</td>
 140     </tr>
 141     <tr>
 142       <td>Declared type of an expression</td>
 143       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a></td>
 144       <td class="full" align="center">Clang 2.9</td>
 145     </tr>
 146     <tr>
 147       <td>&nbsp;&nbsp;&nbsp;&nbsp;Incomplete return types</td>
 148       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3276.pdf">N3276</a></td>
 149       <td class="full" align="center">Clang 3.1</td>
 150     </tr>
 151     <tr>
 152       <td>Right angle brackets</td>
 153       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a></td>
 154       <td class="full" align="center">Clang 2.9</td>
 155     </tr>
 156     <tr>
 157       <td>Default template arguments for function templates</td>
 158       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#226">DR226</a></td>
 159       <td class="full" align="center">Clang 2.9</td>
 160     </tr>
 161     <tr>
 162       <td>Solving the SFINAE problem for expressions</td>
 163       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2634.html">DR339</a></td>
 164       <td class="full" align="center">Clang 2.9</td>
 165     </tr>
 166     <tr>
 167       <td>Alias templates</td>
 168       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf">N2258</a></td>
 169       <td class="full" align="center">Clang 3.0</td>
 170     </tr>
 171     <tr>
 172       <td>Extern templates</td>
 173       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1987.htm">N1987</a></td>
 174       <td class="full" align="center">Clang 2.9</td>
 175     </tr>
 176     <tr>
 177       <td>Null pointer constant</td>
 178       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a></td>
 179       <td class="full" align="center">Clang 3.0</td>
 180     </tr>
 181     <tr>
 182       <td>Strongly-typed enums</td>
 183       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf">N2347</a></td>
 184       <td class="full" align="center">Clang 2.9</td>
 185     </tr>
 186     <tr>
 187       <td>Forward declarations for enums</td>
 188       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2764.pdf">N2764</a>
 189       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1206">DR1206</a></td>
 190       <td class="full" align="center">Clang 3.1</td>
 191     </tr>
 192     <tr>
 193       <td>Standardized attribute syntax</td>
 194       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2761.pdf">N2761</a></td>
 195       <td class="full" align="center">Clang 3.3 <a href="#n2761">(1)</a></td>
 196     </tr>
 197     <tr>
 198       <td>Generalized constant expressions</td>
 199       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf">N2235</a></td>
 200       <td class="full" align="center">Clang 3.1</td>
 201     </tr>
 202     <tr>
 203       <td>Alignment support</td>
 204       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf">N2341</a></td>
 205       <td class="full" align="center">Clang 3.3</td>
 206     </tr>
 207     <tr>
 208       <td>Conditionally-support behavior</td>
 209       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1627.pdf">N1627</a></td>
 210       <td class="full" align="center">Clang 2.9</td>
 211     </tr>
 212     <tr>
 213       <td>Changing undefined behavior into diagnosable errors</td>
 214       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1727.pdf">N1727</a></td>
 215       <td class="full" align="center">Clang 2.9</td>
 216     </tr>
 217     <tr>
 218       <td>Delegating constructors</td>
 219       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf">N1986</a></td>
 220       <td class="full" align="center">Clang 3.0</td>
 221     </tr>
 222     <tr>
 223       <td>Inheriting constructors</td>
 224       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2540.htm">N2540</a></td>
 225       <td class="full" align="center">Clang 3.3</td>
 226     </tr>
 227     <tr>
 228       <td>Explicit conversion operators</td>
 229       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a></td>
 230       <td class="full" align="center">Clang 3.0</td>
 231     </tr>
 232     <tr>
 233       <td>New character types</td>
 234       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2249.html">N2249</a></td>
 235       <td class="full" align="center">Clang 2.9</td>
 236     </tr>
 237     <tr>
 238       <td>Unicode string literals</td>
 239       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
 240       <td class="full" align="center">Clang 3.0</td>
 241     </tr>
 242     <tr>
 243       <td>Raw string literals</td>
 244       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
 245       <td class="full" align="center">Clang 3.0</td>
 246     </tr>
 247     <tr>
 248       <td>Universal character names in literals</td>
 249       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2170.html">N2170</a></td>
 250       <td class="full" align="center">Clang 3.1</td>
 251     </tr>
 252     <tr>
 253       <td>User-defined literals</td>
 254       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2765.pdf">N2765</a></td>
 255       <td class="full" align="center">Clang 3.1</td>
 256     </tr>
 257     <tr>
 258       <td>Standard Layout Types</td>
 259       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2342.htm">N2342</a></td>
 260       <td class="full" align="center">Clang 3.0</td>
 261     </tr>
 262     <tr>
 263       <td>Defaulted functions</td>
 264       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
 265       <td class="full" align="center">Clang 3.0</td>
 266     </tr>
 267     <tr>
 268       <td>Deleted functions</td>
 269       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
 270       <td class="full" align="center">Clang 2.9</td>
 271     </tr>
 272     <tr>
 273       <td>Extended friend declarations</td>
 274       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1791.pdf">N1791</a></td>
 275       <td class="full" align="center">Clang 2.9</td>
 276     </tr>
 277     <tr>
 278       <td>Extending <code>sizeof</code></td>
 279       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2253.html">N2253</a>
 280       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#850">DR850</a></td>
 281       <td class="full" align="center">Clang 3.1</td>
 282     </tr>
 283     <tr>
 284       <td>Inline namespaces</td>
 285       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2535.htm">N2535</a></td>
 286       <td class="full" align="center">Clang 2.9</td>
 287     </tr>
 288     <tr>
 289       <td>Unrestricted unions</td>
 290       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2544.pdf">N2544</a></td>
 291       <td class="full" align="center">Clang 3.1</td>
 292     </tr>
 293     <tr>
 294       <td>Local and unnamed types as template arguments</td>
 295       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm">N2657</a></td>
 296       <td class="full" align="center">Clang 2.9</td>
 297     </tr>
 298     <tr>
 299       <td>Range-based for</td>
 300       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2930.html">N2930</a></td>
 301       <td class="full" align="center">Clang 3.0</td>
 302     </tr>
 303     <tr>
 304       <td>Explicit virtual overrides</td>
 305       <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2928.htm">N2928</a>
 306       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3206.htm">N3206</a>
 307       <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3272.htm">N3272</a></td>
 308       <td class="full" align="center">Clang 3.0</td>
 309     </tr>
 310     <tr>
 311       <td>Minimal support for garbage collection and reachability-based leak detection</td>
 312       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2670.htm">N2670</a></td>
 313       <td class="na" align="center">N/A <a href="#n2670">(2)</a></td>
 314     </tr>
 315     <tr>
 316       <td>Allowing move constructors to throw [noexcept]</td>
 317       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3050.html">N3050</a></td>
 318       <td class="full" align="center">Clang 3.0</td>
 319     </tr>
 320     <tr>
 321       <td>Defining move special member functions</td>
 322       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3053.html">N3053</a></td>
 323       <td class="full" align="center">Clang 3.0</td>
 324     </tr>
 325
 326     <tr class="separator">
 327       <th align="center" colspan="3">Concurrency</th>
 328     </tr>
 329     <tr>
 330       <td>Sequence points</td>
 331       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2239.html">N2239</a></td>
 332       <td class="full" align="center">Clang 3.3</td>
 333     </tr>
 334     <tr>
 335       <td>Atomic operations</td>
 336       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html">N2427</a></td>
 337       <td class="full" align="center">Clang 3.1</td>
 338     </tr>
 339     <tr>
 340       <td>Strong Compare and Exchange</td>
 341       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2748.html">N2748</a></td>
 342       <td class="full" align="center">Clang 3.1 <a href="#n2748">(3)</a></td>
 343     </tr>
 344     <tr>
 345       <td>Bidirectional Fences</td>
 346       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2752.htm">N2752</a></td>
 347       <td class="full" align="center">Clang 3.1</td>
 348     </tr>
 349
 350     <tr>
 351       <td>Memory model</td>
 352       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2429.htm">N2429</a></td>
 353       <td class="full" align="center">Clang 3.2</td>
 354     </tr>
 355     <tr>
 356       <td>Data-dependency ordering: atomics and memory model</td>
 357       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2664.htm">N2664</a></td>
 358       <td class="full" align="center">Clang 3.2 <a href="#n2664">(4)</a></td>
 359     </tr>
 360     <tr>
 361       <td>Propagating exceptions</td>
 362       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html">N2179</a></td>
 363       <td class="full" align="center">Clang 2.9</td>
 364     </tr>
 365     <tr>
 366       <td>Allow atomics use in signal handlers</td>
 367       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2547.htm">N2547</a></td>
 368       <td class="full" align="center">Clang 3.1</td>
 369     </tr>
 370     <tr>
 371       <td>Thread-local storage</td>
 372       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2659.htm">N2659</a></td>
 373       <td class="full" align="center">Clang 3.3 <a href="#n2659">(5)</a></td>
 374     </tr>
 375     <tr>
 376       <td>Dynamic initialization and destruction with concurrency</td>
 377       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">N2660</a></td>
 378       <td class="full" align="center">Clang 2.9</td>
 379     </tr>
 380
 381     <tr class="separator">
 382       <th align="center" colspan="3">C99 Features in C++11</th>
 383     </tr>
 384     <tr>
 385       <td><code>__func__</code> predefined identifier</td>
 386       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2340.htm">N2340</a></td>
 387       <td class="full" align="center">Clang 2.9</td>
 388     </tr>
 389     <tr>
 390       <td>C99 preprocessor</td>
 391       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1653.htm">N1653</a></td>
 392       <td class="full" align="center">Clang 2.9</td>
 393     </tr>
 394     <tr>
 395       <td><code>long long</code></td>
 396       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1811.pdf">N1811</a></td>
 397       <td class="full" align="center">Clang 2.9</td>
 398     </tr>
 399     <tr>
 400       <td>Extended integral types</td>
 401       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1988.pdf">N1988</a></td>
 402       <td class="na" align="center">N/A <a href="#n1988">(6)</a></td>
 403     </tr>
 404 </table>
 405
 406 <p>
 407 <span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute
 408 has no effect.</span><br>
 409 <span id="n2670">(2): No compiler changes are required for an implementation
 410 such as Clang that does not provide garbage collection.</span><br>
 411 <span id="n2748">(3): All compare-exchange operations are emitted as
 412 strong compare-exchanges.</span><br>
 413 <span id="n2664">(4): <code>memory_order_consume</code> is lowered to
 414 <code>memory_order_acquire</code>.</span><br>
 415 <span id="n2659">(5): <code>thread_local</code> support
 416 requires a C++ runtime library providing <code>__cxa_thread_atexit</code>, such
 417 as <a href="http://libcxxabi.llvm.org">libc++abi</a> 3.6 or later,
 418 or libsupc++ 4.8 or later.</span><br>
 419 <span id="n1988">(6): No compiler changes are required for an implementation
 420 such as Clang that does not provide any extended integer types.
 421 <code>__int128</code> is not treated as an extended integer type,
 422 because changing <code>intmax_t</code> would be an ABI-incompatible
 423 change.</span>
 424 </p>
 425 </details>
 426
 427 <h2 id="cxx14">C++14 implementation status</h2>
 428
 429 <p>Clang 3.4 and later implement all of the <a
 430     href="http://www.iso.org/iso/catalogue_detail.htm?csnumber=64029">ISO
 431     C++ 2014 standard</a>.
 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 <details>
 437 <summary>List of features and minimum Clang version with support</summary>
 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 </details>
 521
 522 <h2 id="cxx17">C++1z implementation status</h2>
 523
 524 <p>Clang has <b>experimental</b> support for some proposed features of
 525 the C++ standard following C++14, provisionally named C++1z.
 526 Note that support for these features may change or be removed without notice,
 527 as the draft C++1z standard evolves.
 528
 529 <p>You can use Clang in C++1z mode with the <code>-std=c++1z</code> option.</p>
 530
 531 <details open>
 532 <summary>List of features and minimum Clang version with support</summary>
 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 2014 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="full" align="center">Clang 3.9</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="full" align="center">Clang 4</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="full" align="center">Clang 3.9 <a href="#p0136">(9)</a></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="full" align="center">Clang 3.9</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="full" align="center">Clang 3.9</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="full" align="center">Clang 3.9</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="full" align="center">Clang 3.9</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="svn" align="center">SVN</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="full" align="center">Clang 3.9</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="full" align="center">Clang 3.9</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="full" align="center">Clang 3.9</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="full" align="center">Clang 3.9</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="full" align="center">Clang 4</td>
 684     </tr>
 685     <tr>
 686       <td rowspan="2">Template argument deduction for class templates</td>
 687       <td><a href="http://wg21.link/p0091r3">P0091R3</a></td>
 688       <td rowspan="2" class="svn" align="center">SVN</td>
 689     </tr>
 690       <tr> <!-- from Issaquah -->
 691         <td><a href="http://wg21.link/p0512r0">P0512R0</a></td>
 692       </tr>
 693     <tr>
 694       <td>Non-type template parameters with <tt>auto</tt> type</td>
 695       <td><a href="http://wg21.link/p0127r2">P0127R2</a></td>
 696       <td class="full" align="center">Clang 4</td>
 697     </tr>
 698     <tr>
 699       <td>Guaranteed copy elision</td>
 700       <td><a href="http://wg21.link/p0135r1">P0135R1</a></td>
 701       <td class="full" align="center">Clang 4</td>
 702     </tr>
 703     <tr>
 704       <td rowspan=2>Stricter expression evaluation order</td>
 705       <td><a href="http://wg21.link/p0145r3">P0145R3</a></td>
 706       <td class="full" align="center" rowspan=2>Clang 4 <a href="#p0145">(10)</a></td>
 707     </tr>
 708     <tr>
 709       <td><a href="http://wg21.link/p0400r0">P0400R0</a></td>
 710     </tr>
 711     <tr>
 712       <td>Requirement to ignore unknown attributes</td>
 713       <td><a href="http://wg21.link/p0283r2">P0283R2</a></td>
 714       <td class="full" align="center">Yes</td>
 715     </tr>
 716     <tr>
 717       <td><tt>constexpr</tt> <em>if-statement</em>s</td>
 718       <td><a href="http://wg21.link/p0292r2">P0292R2</a></td>
 719       <td class="full" align="center">Clang 3.9</td>
 720     </tr>
 721     <tr>
 722       <td>Inline variables</td>
 723       <td><a href="http://wg21.link/p0386r2">P0386R2</a></td>
 724       <td class="full" align="center">Clang 3.9</td>
 725     </tr>
 726     <tr>
 727       <td>Structured bindings</td>
 728       <td><a href="http://wg21.link/p0217r3">P0217R3</a></td>
 729       <td class="full" align="center">Clang 4</td>
 730     </tr>
 731     <tr>
 732       <td>Separate variable and condition for <tt>if</tt> and <tt>switch</tt></td>
 733       <td><a href="http://wg21.link/p0305r1">P0305R1</a></td>
 734       <td class="full" align="center">Clang 3.9</td>
 735     </tr>
 736     <!-- Issaquah 2016 papers -->
 737     <tr>
 738       <td>Matching template template parameters to compatible arguments</td>
 739       <td><a href="http://wg21.link/p0522r0">P0522R0</a></td>
 740       <td class="partial" align="center">Partial <a href="#p0522">(12)</a></td>
 741     </tr>
 742     <tr>
 743       <td>Removing deprecated dynamic exception specifications</td>
 744       <td><a href="http://wg21.link/p0003r5">P0003R5</a></td>
 745       <td class="full" align="center">Clang 4</td>
 746     </tr>
 747     <tr>
 748       <td>Pack expansions in <em>using-declarations</em></td>
 749       <td><a href="http://wg21.link/p0195r2">P0195R2</a></td>
 750       <td class="full" align="center">Clang 4</td>
 751     </tr>
 752 </table>
 753
 754 <p>
 755 <span id="n3922">(8): This is a backwards-incompatible change that is applied to
 756 all language versions that allow type deduction from <tt>auto</tt>
 757 (per the request of the C++ committee).
 758 In Clang 3.7, a warning is emitted for all cases that would change meaning.
 759 </span><br>
 760 <span id="p0136">(9): This is the resolution to a Defect Report, so is applied
 761 to all language versions supporting inheriting constructors.
 762 </span><br>
 763 <span id="p0145">(10): Under the MS ABI, function parameters are destroyed from
 764 left to right in the callee. As a result, function parameters in calls to
 765 <tt>operator&lt;&lt;</tt>, <tt>operator&gt;&gt;</tt>, <tt>operator-&gt;*</tt>,
 766 <tt>operator&amp;&amp;</tt>, <tt>operator||</tt>, and <tt>operator,</tt>
 767 functions using expression syntax are no longer guaranteed to be destroyed in
 768 reverse construction order in that ABI.
 769 </span><br>
 770 <span id="p0522">(12): Despite being the the resolution to a Defect Report, this
 771 feature is disabled by default in all language versions, and can be enabled
 772 explicitly with the flag <tt>-frelaxed-template-template-args</tt> in Clang 4.
 773 The change to the standard lacks a corresponding change for template partial
 774 ordering, resulting in ambiguity errors for reasonable and previously-valid
 775 code. This issue is expected to be rectified soon.
 776 </span>
 777 </p>
 778 </details>
 779
 780 <h2 id="ts">Technical specifications and standing documents</h2>
 781
 782 <p>ISO C++ also publishes a number of documents describing additional language
 783 and library features that are not part of standard C++.</p>
 784
 785 <details open>
 786 <summary>List of features and minimum Clang version with support</summary>
 787
 788 <table width="689" border="1" cellspacing="0">
 789  <tr>
 790     <th>Document</th>
 791     <th>Latest draft</th>
 792     <th>Compiler flag</th>
 793     <th>Available in Clang?</th>
 794  </tr>
 795     <tr>
 796       <td rowspan="3">SD-6: SG10 feature test recommendations</td>
 797       <td rowspan="3"><a href="http://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6</a></td>
 798       <td rowspan="3">N/A</td>
 799       <td class="full" align="center">
 800         Clang 3.4 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3745">N3745</a>)</br>
 801       </td>
 802     </tr>
 803     <tr>
 804       <td class="full" align="center">
 805         Clang 3.6 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4200">N4200</a>)</a>
 806       </td>
 807     </tr>
 808     <tr>
 809       <td class="full" align="center">
 810         Clang 4 (<a href="http://wg21.link/p0096r3">P0096R3</a>)</a>
 811       </td>
 812     </tr>
 813     <!-- FIXME: Implement latest recommendations.
 814     <tr>
 815       <td class="svn" align="center">
 816         SVN (<a href="http://wg21.link/p0096r3">P0096R3</a>)</a>
 817       </td>
 818     </tr>
 819     -->
 820     <!-- No compiler support is known to be needed for:
 821            * Concurrency TS
 822            * Parallelism TS
 823            * Ranges TS
 824            * Networking TS
 825            * File System TS
 826     -->
 827     <tr>
 828       <td>[TS] Concepts</td>
 829       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0121r0.pdf">P0121R0</a></td>
 830       <td></td>
 831       <td class="none" align="center">WIP</td>
 832     </tr>
 833     <tr>
 834       <td>[DRAFT TS] Coroutines</td>
 835       <td><a href="https://isocpp.org/files/papers/N4663.pdf">N4663</a></td>
 836       <td><tt>-fcoroutines-ts<br>-stdlib=libc++</tt></td>
 837       <td class="svn" align="center">SVN</td>
 838     </tr>
 839     <tr>
 840       <td>[TS] Library Fundamentals, Version 1 (invocation type traits)</td>
 841       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4480.html">N4480</a></td>
 842       <td>N/A</td>
 843       <td class="none" align="center">No</td>
 844     </tr>
 845     <tr>
 846       <td>[DRAFT TS] Library Fundamentals, Version 2 (<tt>source_location</tt>)</td>
 847      <td><a href="http://wg21.link/n4600">N4600</a></td>
 848       <td>N/A</td>
 849       <td class="none" align="center">No</td>
 850     </tr>
 851     <tr>
 852       <td>[DRAFT TS] Modules</td>
 853       <td><a href="http://wg21.link/n4667">N4667</a></td>
 854       <td><tt>-fmodules-ts</tt></td>
 855       <td class="none" align="center">WIP</td>
 856     </tr>
 857     <tr>
 858       <td>[TS] Transactional Memory</td>
 859       <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4514.pdf">N4514</a></td>
 860       <td></td>
 861       <td class="none" align="center">No</td>
 862     </tr>
 863 </table>
 864 </details>
 865
 866 </div>
 867 </body>
 868 </html>