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Richard Smithcf31c6b2014-06-20 20:33:1026<h1>C++ Support in Clang</h1>
Cedric Venet084381332009-02-14 20:20:1927<!--*************************************************************************-->
Douglas Gregor0799d912009-06-27 19:33:5828<p>Last updated: $Date$</p>
Cedric Venet084381332009-02-14 20:20:1929
Alp Toker05f89432013-12-06 06:35:4930<p>Clang fully implements all published ISO C++ standards including <a
Richard Smith20f37672014-08-31 04:17:4831href="#cxx11">C++11</a>, as well as the upcoming <a
32href="#cxx14">C++14</a> standard, and some parts of the fledgling <a
Richard Smithcf31c6b2014-06-20 20:33:1033href="#cxx17">C++1z</a> standard,
34and is considered a production-quality C++ compiler.
Alp Toker05f89432013-12-06 06:35:4935
Richard Smith60586342013-12-09 08:52:2336<p>The Clang community is continually striving to improve C++ standards
Alp Toker05f89432013-12-06 06:35:4937compliance between releases by submitting and tracking <a
38href="cxx_dr_status.html">C++ Defect Reports</a> and implementing resolutions
39as they become available.</p>
40
41<p>Experimental work is also under way to implement <a href="#ts">C++ Technical
42Specifications</a> that will help drive the future of the C++ programming
43language.</p>
44
Richard Smith60586342013-12-09 08:52:2345<p>The <a href="http://llvm.org/bugs/">LLVM bug tracker</a> contains Clang
46C++ components that track known bugs with Clang's language conformance in
47each language mode.</p>
48
Richard Smith18743de2012-02-24 18:42:0849<h2 id="cxx98">C++98 implementation status</h2>
50
Alp Toker05f89432013-12-06 06:35:4951<p>Clang implements all of the ISO C++ 1998 standard
Douglas Gregor17aa45d2011-07-21 17:46:1552 (including the defects addressed in the ISO C++ 2003 standard)
Richard Smith707e3ba2014-06-22 16:00:0553 except for <tt>export</tt> (which was removed in C++11).
Douglas Gregorbb26a922010-02-05 23:51:1454
Richard Smith18743de2012-02-24 18:42:0855<h2 id="cxx11">C++11 implementation status</h2>
Chris Lattner6fe37482010-05-21 20:59:4056
Richard Smith707e3ba2014-06-22 16:00:0557 <p>Clang 3.3 and later implement all of the <a
Richard Smith25b555a2013-04-19 17:00:3158 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>
Chris Lattner6fe37482010-05-21 20:59:4061
Richard Smith531c9a02013-03-10 00:11:0062<p>By default, Clang builds C++ code according to the C++98 standard, with many
63C++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
65with <a href="http://libcxx.llvm.org/">libc++</a> or with gcc's libstdc++, but
66patches are needed to make <a href="libstdc++4.4-clang0x.patch">libstdc++-4.4</a>
Richard Smith2ddcbab2012-10-23 00:32:4167work with Clang in C++11 mode. Patches are also needed to make
Richard Smith96c07b12013-11-05 09:12:5568<a href="libstdc++4.6-clang11.patch">libstdc++-4.6</a>
Richard Smith2ddcbab2012-10-23 00:32:4169and <a href="libstdc++4.7-clang11.patch">libstdc++-4.7</a> work with Clang
Richard Smith25b555a2013-04-19 17:00:3170releases prior to version 3.2 in C++11 mode. <tt>thread_local</tt> support
Richard Smithe0cabb72013-12-09 08:55:5971currently requires the C++ runtime library from g++-4.8 or later.</p>
Jeffrey Yasskincb407572011-03-29 22:27:5072
Cedric Venet084381332009-02-14 20:20:1973<table width="689" border="1" cellspacing="0">
Douglas Gregor1f64b592011-10-14 23:21:4974 <tr>
Benjamin Kramer1c9e1582011-11-05 10:11:3675 <th>Language Feature</th>
Richard Smith18743de2012-02-24 18:42:0876 <th>C++11 Proposal</th>
Benjamin Kramer1c9e1582011-11-05 10:11:3677 <th>Available in Clang?</th>
Douglas Gregor1f64b592011-10-14 23:21:4978 </tr>
79 <tr>
80 <td>Rvalue references</td>
81 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2118.html">N2118</a></td>
Michael J. Spencere73bd642011-11-02 06:29:3782 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:4983 </tr>
84 <tr>
85 <td>&nbsp;&nbsp;&nbsp;&nbsp;Rvalue references for <code>*this</code></td>
86 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2439.htm">N2439</a></td>
Benjamin Kramer1c9e1582011-11-05 10:11:3687 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:4988 </tr>
89 <tr>
90 <td>Initialization of class objects by rvalues</td>
91 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1610.html">N1610</a></td>
Michael J. Spencere73bd642011-11-02 06:29:3792 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:4993 </tr>
94 <tr>
95 <td>Non-static data member initializers</td>
96 <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2008/n2756.htm">N2756</a></td>
Benjamin Kramer1c9e1582011-11-05 10:11:3697 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor1f64b592011-10-14 23:21:4998 </tr>
99 <tr>
100 <td>Variadic templates</td>
101 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2242.pdf">N2242</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37102 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49103 </tr>
104 <tr>
105 <td>&nbsp;&nbsp;&nbsp;&nbsp;Extending variadic template template parameters</td>
106 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2555.pdf">N2555</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37107 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49108 </tr>
109 <tr>
110 <td>Initializer lists</td>
111 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2672.htm">N2672</a></td>
Richard Smith607d6312012-05-23 01:38:11112 <td class="full" align="center">Clang 3.1</td>
Douglas Gregor1f64b592011-10-14 23:21:49113 </tr>
114 <tr>
115 <td>Static assertions</td>
116 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.html">N1720</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37117 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49118 </tr>
119 <tr>
120 <td><code>auto</code>-typed variables</td>
121 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf">N1984</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37122 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49123 </tr>
124 <tr>
125 <td>&nbsp;&nbsp;&nbsp;&nbsp;Multi-declarator <code>auto</code></td>
126 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1737.pdf">N1737</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37127 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49128 </tr>
129 <tr>
130 <td>&nbsp;&nbsp;&nbsp;&nbsp;Removal of auto as a storage-class specifier</td>
131 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2546.htm">N2546</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37132 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49133 </tr>
134 <tr>
135 <td>&nbsp;&nbsp;&nbsp;&nbsp;New function declarator syntax</td>
136 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2541.htm">N2541</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37137 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49138 </tr>
139 <tr>
Douglas Gregor34b2e8b2012-02-23 03:02:32140 <td>Lambda expressions</td>
Douglas Gregor1f64b592011-10-14 23:21:49141 <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2927.pdf">N2927</a></td>
Richard Smith607d6312012-05-23 01:38:11142 <td class="full" align="center">Clang 3.1</td>
Douglas Gregor1f64b592011-10-14 23:21:49143 </tr>
144 <tr>
145 <td>Declared type of an expression</td>
146 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37147 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49148 </tr>
149 <tr>
Douglas Gregor05989622012-04-10 20:00:33150 <td>&nbsp;&nbsp;&nbsp;&nbsp;Incomplete return types</td>
151 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3276.pdf">N3276</a></td>
Richard Smith607d6312012-05-23 01:38:11152 <td class="full" align="center">Clang 3.1</td>
Douglas Gregor05989622012-04-10 20:00:33153 </tr>
154 <tr>
Douglas Gregor1f64b592011-10-14 23:21:49155 <td>Right angle brackets</td>
156 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37157 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49158 </tr>
159 <tr>
160 <td>Default template arguments for function templates</td>
161 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#226">DR226</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37162 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49163 </tr>
164 <tr>
165 <td>Solving the SFINAE problem for expressions</td>
166 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2634.html">DR339</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37167 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49168 </tr>
169 <tr>
170 <td>Alias templates</td>
171 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf">N2258</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37172 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor1f64b592011-10-14 23:21:49173 </tr>
174 <tr>
175 <td>Extern templates</td>
176 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1987.htm">N1987</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37177 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49178 </tr>
179 <tr>
180 <td>Null pointer constant</td>
181 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37182 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor1f64b592011-10-14 23:21:49183 </tr>
184 <tr>
185 <td>Strongly-typed enums</td>
186 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf">N2347</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37187 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49188 </tr>
189 <tr>
190 <td>Forward declarations for enums</td>
Richard Smith4b38ded2012-03-14 23:13:10191 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2764.pdf">N2764</a>
192 <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1206">DR1206</a></td>
Richard Smith607d6312012-05-23 01:38:11193 <td class="full" align="center">Clang 3.1</td>
Douglas Gregor1f64b592011-10-14 23:21:49194 </tr>
195 <tr>
Richard Smith3dd73db2014-01-17 00:11:48196 <td>Standardized attribute syntax</td>
Douglas Gregor1f64b592011-10-14 23:21:49197 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2761.pdf">N2761</a></td>
Richard Smith99247722013-06-17 23:54:23198 <td class="full" align="center">Clang 3.3 <a href="#n2761">(1)</a></td>
Douglas Gregor1f64b592011-10-14 23:21:49199 </tr>
200 <tr>
201 <td>Generalized constant expressions</td>
202 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf">N2235</a></td>
Richard Smith607d6312012-05-23 01:38:11203 <td class="full" align="center">Clang 3.1</td>
Douglas Gregor1f64b592011-10-14 23:21:49204 </tr>
205 <tr>
206 <td>Alignment support</td>
207 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf">N2341</a></td>
Richard Smith99247722013-06-17 23:54:23208 <td class="full" align="center">Clang 3.3</td>
Douglas Gregor1f64b592011-10-14 23:21:49209 </tr>
Richard Smith7e34fbd2014-03-14 21:21:24210 <tr>
211 <td>Conditionally-support behavior</td>
212 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1627.pdf">N1627</a></td>
213 <td class="full" align="center">Clang 2.9</td>
214 </tr>
215 <tr>
216 <td>Changing undefined behavior into diagnosable errors</td>
217 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1727.pdf">N1727</a></td>
218 <td class="full" align="center">Clang 2.9</td>
219 </tr>
Douglas Gregor1f64b592011-10-14 23:21:49220 <tr>
221 <td>Delegating constructors</td>
222 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf">N1986</a></td>
Benjamin Kramer1c9e1582011-11-05 10:11:36223 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor1f64b592011-10-14 23:21:49224 </tr>
225 <tr>
226 <td>Inheriting constructors</td>
227 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2540.htm">N2540</a></td>
Richard Smith99247722013-06-17 23:54:23228 <td class="full" align="center">Clang 3.3</td>
Douglas Gregor1f64b592011-10-14 23:21:49229 </tr>
230 <tr>
231 <td>Explicit conversion operators</td>
232 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37233 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor1f64b592011-10-14 23:21:49234 </tr>
235 <tr>
236 <td>New character types</td>
237 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2249.html">N2249</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37238 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49239 </tr>
240 <tr>
241 <td>Unicode string literals</td>
242 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37243 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor1f64b592011-10-14 23:21:49244 </tr>
245 <tr>
246 <td>Raw string literals</td>
247 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37248 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor1f64b592011-10-14 23:21:49249 </tr>
250 <tr>
Richard Smith2a70e652012-03-09 22:27:51251 <td>Universal character names in literals</td>
Douglas Gregor1f64b592011-10-14 23:21:49252 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2170.html">N2170</a></td>
Richard Smith607d6312012-05-23 01:38:11253 <td class="full" align="center">Clang 3.1</td>
Douglas Gregor1f64b592011-10-14 23:21:49254 </tr>
255 <tr>
256 <td>User-defined literals</td>
257 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2765.pdf">N2765</a></td>
Richard Smith607d6312012-05-23 01:38:11258 <td class="full" align="center">Clang 3.1</td>
Douglas Gregor1f64b592011-10-14 23:21:49259 </tr>
260 <tr>
261 <td>Standard Layout Types</td>
262 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2342.htm">N2342</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37263 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor1f64b592011-10-14 23:21:49264 </tr>
265 <tr>
Douglas Gregor7ff1e7e2011-10-28 19:44:09266 <td>Defaulted functions</td>
267 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37268 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor7ff1e7e2011-10-28 19:44:09269 </tr>
270 <tr>
271 <td>Deleted functions</td>
Douglas Gregor1f64b592011-10-14 23:21:49272 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37273 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49274 </tr>
275 <tr>
276 <td>Extended friend declarations</td>
277 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1791.pdf">N1791</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37278 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49279 </tr>
280 <tr>
281 <td>Extending <code>sizeof</code></td>
Richard Smith4e837622012-02-24 18:37:14282 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2253.html">N2253</a>
283 <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#850">DR850</a></td>
Richard Smith607d6312012-05-23 01:38:11284 <td class="full" align="center">Clang 3.1</td>
Douglas Gregor1f64b592011-10-14 23:21:49285 </tr>
286 <tr>
287 <td>Inline namespaces</td>
288 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2535.htm">N2535</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37289 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49290 </tr>
291 <tr>
292 <td>Unrestricted unions</td>
293 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2544.pdf">N2544</a></td>
Richard Smith607d6312012-05-23 01:38:11294 <td class="full" align="center">Clang 3.1</td>
Douglas Gregor1f64b592011-10-14 23:21:49295 </tr>
296 <tr>
297 <td>Local and unnamed types as template arguments</td>
298 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm">N2657</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37299 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49300 </tr>
301 <tr>
302 <td>Range-based for</td>
303 <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2930.html">N2930</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37304 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor1f64b592011-10-14 23:21:49305 </tr>
306 <tr>
307 <td>Explicit virtual overrides</td>
308 <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2928.htm">N2928</a>
Richard Smith4e837622012-02-24 18:37:14309 <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3206.htm">N3206</a>
310 <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3272.htm">N3272</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37311 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor1f64b592011-10-14 23:21:49312 </tr>
313 <tr>
314 <td>Minimal support for garbage collection and reachability-based leak detection</td>
315 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2670.htm">N2670</a></td>
Richard Smithd997cce2014-03-14 20:26:09316 <td class="na" align="center">N/A <a href="#n2670">(2)</a></td>
Douglas Gregor1f64b592011-10-14 23:21:49317 </tr>
318 <tr>
319 <td>Allowing move constructors to throw [noexcept]</td>
David Blaikie50361612011-11-02 15:13:40320 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3050.html">N3050</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37321 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor1f64b592011-10-14 23:21:49322 </tr>
323 <tr>
324 <td>Defining move special member functions</td>
David Blaikie50361612011-11-02 15:13:40325 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3053.html">N3053</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37326 <td class="full" align="center">Clang 3.0</td>
Douglas Gregor1f64b592011-10-14 23:21:49327 </tr>
Cedric Venet084381332009-02-14 20:20:19328
Douglas Gregor1f64b592011-10-14 23:21:49329 <tr class="separator">
Benjamin Kramer1c9e1582011-11-05 10:11:36330 <th align="center" colspan="3">Concurrency</th>
Douglas Gregor1f64b592011-10-14 23:21:49331 </tr>
332 <tr>
333 <td>Sequence points</td>
334 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2239.html">N2239</a></td>
Richard Smith99247722013-06-17 23:54:23335 <td class="full" align="center">Clang 3.3</td>
Douglas Gregor1f64b592011-10-14 23:21:49336 </tr>
337 <tr>
338 <td>Atomic operations</td>
339 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html">N2427</a></td>
Richard Smith607d6312012-05-23 01:38:11340 <td class="full" align="center">Clang 3.1</td>
Douglas Gregor1f64b592011-10-14 23:21:49341 </tr>
342 <tr>
343 <td>Strong Compare and Exchange</td>
344 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2748.html">N2748</a></td>
Richard Smithd997cce2014-03-14 20:26:09345 <td class="full" align="center">Clang 3.1 <a href="#n2748">(3)</a></td>
Douglas Gregor1f64b592011-10-14 23:21:49346 </tr>
347 <tr>
348 <td>Bidirectional Fences</td>
349 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2752.htm">N2752</a></td>
Richard Smith607d6312012-05-23 01:38:11350 <td class="full" align="center">Clang 3.1</td>
Douglas Gregor1f64b592011-10-14 23:21:49351 </tr>
Douglas Gregor6b6e0822010-12-21 05:43:31352
Douglas Gregor1f64b592011-10-14 23:21:49353 <tr>
354 <td>Memory model</td>
355 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2429.htm">N2429</a></td>
Richard Smithbc4fc772013-01-29 04:55:18356 <td class="full" align="center">Clang 3.2</td>
Douglas Gregor1f64b592011-10-14 23:21:49357 </tr>
358 <tr>
359 <td>Data-dependency ordering: atomics and memory model</td>
360 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2664.htm">N2664</a></td>
Richard Smithd997cce2014-03-14 20:26:09361 <td class="full" align="center">Clang 3.2 <a href="#n2664">(4)</a></td>
Douglas Gregor1f64b592011-10-14 23:21:49362 </tr>
363 <tr>
364 <td>Propagating exceptions</td>
365 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html">N2179</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37366 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49367 </tr>
368 <tr>
Douglas Gregor1f64b592011-10-14 23:21:49369 <td>Allow atomics use in signal handlers</td>
370 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2547.htm">N2547</a></td>
Richard Smith607d6312012-05-23 01:38:11371 <td class="full" align="center">Clang 3.1</td>
Douglas Gregor1f64b592011-10-14 23:21:49372 </tr>
373 <tr>
374 <td>Thread-local storage</td>
375 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2659.htm">N2659</a></td>
Richard Smith99247722013-06-17 23:54:23376 <td class="full" align="center">Clang 3.3</td>
Douglas Gregor1f64b592011-10-14 23:21:49377 </tr>
378 <tr>
379 <td>Dynamic initialization and destruction with concurrency</td>
380 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">N2660</a></td>
Richard Smith537a8342013-02-22 09:31:00381 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49382 </tr>
Cedric Venet084381332009-02-14 20:20:19383
Douglas Gregor1f64b592011-10-14 23:21:49384 <tr class="separator">
Richard Smith18743de2012-02-24 18:42:08385 <th align="center" colspan="3">C99 Features in C++11</th>
Douglas Gregor1f64b592011-10-14 23:21:49386 </tr>
387 <tr>
388 <td><code>__func__</code> predefined identifier</td>
389 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2340.htm">N2340</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37390 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49391 </tr>
392 <tr>
393 <td>C99 preprocessor</td>
394 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1653.htm">N1653</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37395 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49396 </tr>
397 <tr>
398 <td><code>long long</code></td>
399 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1811.pdf">N1811</a></td>
Michael J. Spencere73bd642011-11-02 06:29:37400 <td class="full" align="center">Clang 2.9</td>
Douglas Gregor1f64b592011-10-14 23:21:49401 </tr>
402 <tr>
403 <td>Extended integral types</td>
404 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1988.pdf">N1988</a></td>
Richard Smithd997cce2014-03-14 20:26:09405 <td class="na" align="center">N/A <a href="#n1988">(5)</a></td>
Douglas Gregor1f64b592011-10-14 23:21:49406 </tr>
Cedric Venet084381332009-02-14 20:20:19407</table>
Richard Smith9deb9d92013-03-12 19:56:09408
409<p>
410<span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute
Richard Smith38546ed2013-03-18 21:57:52411has no effect.</span><br>
Richard Smithd997cce2014-03-14 20:26:09412<span id="n2670">(2): No compiler changes are required for an implementation
413such as Clang that does not provide garbage collection.</span><br>
414<span id="n2748">(3): All compare-exchange operations are emitted as
Richard Smith38546ed2013-03-18 21:57:52415strong compare-exchanges.</span><br>
Richard Smithd997cce2014-03-14 20:26:09416<span id="n2664">(4): <code>memory_order_consume</code> is lowered to
Richard Smith38546ed2013-03-18 21:57:52417<code>memory_order_acquire</code>.</span><br>
Richard Smithd997cce2014-03-14 20:26:09418<span id="n1988">(5): No compiler changes are required for an implementation
419such as Clang that does not provide any extended integer types.
420<code>__int128</code> is not treated as an extended integer type,
421because changing <code>intmax_t</code> would be an ABI-incompatible
422change.</span>
Richard Smith9deb9d92013-03-12 19:56:09423</p>
424
Richard Smith20f37672014-08-31 04:17:48425<h2 id="cxx14">C++14 implementation status</h2>
Richard Smith91725202013-04-19 17:27:48426
Richard Smith707e3ba2014-06-22 16:00:05427<p>Clang 3.4 and later implement all of the Draft International Standard (see <a
Richard Smith7cebe462014-06-22 15:54:54428href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3797.pdf">most
429recent publicly available draft</a>)
Richard Smith20f37672014-08-31 04:17:48430of the upcoming C++14 language standard. The following table describes the
431Clang version in which each feature became available.</p>
Richard Smith91725202013-04-19 17:27:48432
Richard Smith20f37672014-08-31 04:17:48433<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).</p>
Richard Smith4cf9a1e2013-04-20 13:22:50435
Richard Smith91725202013-04-19 17:27:48436<table width="689" border="1" cellspacing="0">
437 <tr>
438 <th>Language Feature</th>
Richard Smith20f37672014-08-31 04:17:48439 <th>C++14 Proposal</th>
Richard Smith91725202013-04-19 17:27:48440 <th>Available in Clang?</th>
441 </tr>
442 <tr>
443 <td>Tweak to certain C++ contextual conversions</td>
444 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3323.pdf">N3323</a></td>
Richard Smith7fe89622014-02-03 06:58:08445 <td class="full" align="center">Clang 3.4</td>
Richard Smith91725202013-04-19 17:27:48446 </tr>
447 <tr>
Richard Smith0fa4fce2013-04-20 12:44:32448 <td>Binary literals</td>
Richard Smith91725202013-04-19 17:27:48449 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3472.pdf">N3472</a></td>
Richard Smithc5c27f22013-04-19 20:47:20450 <td class="full" align="center">Yes</td>
Richard Smith91725202013-04-19 17:27:48451 </tr>
452 <tr>
Richard Smith74aeef52013-04-26 16:15:35453 <td>decltype(auto)</td>
Richard Smithf2f6e1142013-05-09 18:53:17454 <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>
Richard Smith99247722013-06-17 23:54:23455 <td class="full" align="center">Clang 3.3</td>
Richard Smith74aeef52013-04-26 16:15:35456 </tr>
457 <tr>
Richard Smith5db8b282013-04-20 12:47:36458 <td>Return type deduction for normal functions</td>
Richard Smith7fe89622014-02-03 06:58:08459 <td class="full" align="center">Clang 3.4</td>
Richard Smith5db8b282013-04-20 12:47:36460 </tr>
Richard Smith0fa4fce2013-04-20 12:44:32461 <tr>
Richard Smith5db8b282013-04-20 12:47:36462 <td>Initialized lambda captures</td>
Richard Smithf2f6e1142013-05-09 18:53:17463 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3648.html">N3648</a></td>
Richard Smith7fe89622014-02-03 06:58:08464 <td class="full" align="center">Clang 3.4</td>
Richard Smith91725202013-04-19 17:27:48465 </tr>
466 <tr>
Richard Smith7898d7b2013-04-20 12:58:57467 <td>Generic lambdas</td>
Richard Smithf2f6e1142013-05-09 18:53:17468 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3649.html">N3649</a></td>
Richard Smith7fe89622014-02-03 06:58:08469 <td class="full" align="center">Clang 3.4</td>
Richard Smith91725202013-04-19 17:27:48470 </tr>
471 <tr>
Richard Smith7898d7b2013-04-20 12:58:57472 <td>Variable templates</td>
Richard Smithf2f6e1142013-05-09 18:53:17473 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3651.pdf">N3651</a></td>
Richard Smith7fe89622014-02-03 06:58:08474 <td class="full" align="center">Clang 3.4</td>
Richard Smith91725202013-04-19 17:27:48475 </tr>
476 <tr>
Richard Smith7feda2f2013-04-20 12:49:36477 <td>Relaxing requirements on constexpr functions</td>
Richard Smithf2f6e1142013-05-09 18:53:17478 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3652.html">N3652</a></td>
Richard Smith7fe89622014-02-03 06:58:08479 <td class="full" align="center">Clang 3.4</td>
Richard Smith91725202013-04-19 17:27:48480 </tr>
481 <tr>
Richard Smith5db8b282013-04-20 12:47:36482 <td>Member initializers and aggregates</td>
Richard Smithf2f6e1142013-05-09 18:53:17483 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3653.html">N3653</a></td>
Richard Smith99247722013-06-17 23:54:23484 <td class="full" align="center">Clang 3.3</td>
Richard Smith91725202013-04-19 17:27:48485 </tr>
Richard Smith91725202013-04-19 17:27:48486 <tr>
Richard Smithd3a73862013-04-20 12:57:49487 <td>Clarifying memory allocation</td>
Richard Smithf2f6e1142013-05-09 18:53:17488 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3664.html">N3664</a></td>
Richard Smith7fe89622014-02-03 06:58:08489 <td class="full" align="center">Clang 3.4</td>
Richard Smith91725202013-04-19 17:27:48490 </tr>
Richard Smith3ca005b2013-09-27 19:11:33491 <tr>
492 <td><tt>[[deprecated]]</tt> attribute</td>
493 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3760.html">N3760</a></td>
Richard Smith7fe89622014-02-03 06:58:08494 <td class="full" align="center">Clang 3.4</td>
Richard Smith3ca005b2013-09-27 19:11:33495 </tr>
496 <tr>
497 <td>Single quotation mark as digit separator</td>
Richard Smith2d1d3ca2013-11-05 08:27:00498 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3781.pdf">N3781</a></td>
Richard Smith7fe89622014-02-03 06:58:08499 <td class="full" align="center">Clang 3.4</td>
Richard Smith3ca005b2013-09-27 19:11:33500 </tr>
501 <tr>
Benjamin Kramer8ba47d02013-09-27 19:35:09502 <td>C++ Sized Deallocation</td>
Richard Smith2d1d3ca2013-11-05 08:27:00503 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3778.html">N3778</a></td>
Richard Smith7fe89622014-02-03 06:58:08504 <td class="full" align="center">Clang 3.4</td>
Richard Smith3ca005b2013-09-27 19:11:33505 </tr>
Richard Smith91725202013-04-19 17:27:48506</table>
507
Richard Smith76b9f232013-11-07 06:41:26508<h2 id="cxx17">C++1z implementation status</h2>
509
Richard Smitha32124a2014-06-20 20:34:03510<p>Clang has <b>highly experimental</b> support for some proposed features of
Richard Smith20f37672014-08-31 04:17:48511the C++ standard following C++14,
Richard Smith76b9f232013-11-07 06:41:26512provisionally named C++1z. The following table describes which C++1z features
513have been implemented in Clang and in which Clang version they became
514available.</p>
515
Richard Smithcf31c6b2014-06-20 20:33:10516<p>Note that support for these features may change or be removed without notice,
517as the draft C++1z standard evolves.</p>
518
Richard Smith76b9f232013-11-07 06:41:26519<p>You can use Clang in C++1z mode with the <code>-std=c++1z</code> option.</p>
Richard Smithcf31c6b2014-06-20 20:33:10520
521<table width="689" border="1" cellspacing="0">
522 <tr>
523 <th>Language Feature</th>
524 <th>C++1z Proposal</th>
525 <th>Available in Clang?</th>
526 </tr>
527 <tr>
528 <td><tt>static_assert</tt> with no message</td>
529 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3928.pdf">N3928</a></td>
Richard Smith4a4b3572014-06-20 20:35:42530 <td class="svn" align="center">SVN</td>
Richard Smithcf31c6b2014-06-20 20:33:10531 </tr>
532 <tr>
533 <td>Disabling trigraph expansion by default</td>
534 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3981.html">N3981</a></td>
Richard Smith4a4b3572014-06-20 20:35:42535 <td class="svn" align="center">SVN</td>
Richard Smithcf31c6b2014-06-20 20:33:10536 </tr>
537 <tr>
538 <td>Terse range-based for loops</td>
539 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3994.htm">N3994</a></td>
Richard Smith4a4b3572014-06-20 20:35:42540 <td class="svn" align="center">SVN</td>
Richard Smithcf31c6b2014-06-20 20:33:10541 </tr>
542 <tr>
543 <td><tt>typename</tt> in a template template parameter</td>
544 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4051.html">N4051</a></td>
Richard Smith4a4b3572014-06-20 20:35:42545 <td class="svn" align="center">SVN</td>
Richard Smithcf31c6b2014-06-20 20:33:10546 </tr>
547</table>
Richard Smith76b9f232013-11-07 06:41:26548
Richard Smith91e474f2013-11-27 22:58:16549<h2 id="ts">Technical specifications and standing documents</h2>
550
551<p>ISO C++ also publishes a number of documents describing additional language
552and library features that are not part of standard C++. The following table
553describes which language features have been implemented in Clang and in which
554Clang version they became available:</p>
555
556<table width="689" border="1" cellspacing="0">
557 <tr>
558 <th>Document</th>
559 <th>Latest draft</th>
560 <th>Available in Clang?</th>
561 </tr>
562 <tr>
563 <td>SD-6: SG10 feature test recommendations</td>
564 <td><a href="http://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6</a></td>
Richard Smith7fe89622014-02-03 06:58:08565 <td class="full" align="center">Clang 3.4 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3745">N3745</a>)</td>
Richard Smith91e474f2013-11-27 22:58:16566 </tr>
567 <tr>
568 <td>[DRAFT TS] Array extensions (arrays of runtime bound)</td>
569 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3820.html">N3820</a></td>
570 <td class="none" align="center">No</td>
571 </tr>
Richard Smith3a0ed872014-02-15 00:29:00572 <tr>
573 <td>[DRAFT TS] Library fundamentals (invocation type traits)</td>
Richard Smith586cd942014-03-04 20:22:54574 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3908.html">N3908</a></td>
Richard Smith3a0ed872014-02-15 00:29:00575 <td class="none" align="center">No</td>
576 </tr>
577 <tr>
Richard Smith3a0ed872014-02-15 00:29:00578 <td>[DRAFT TS] Concepts</td>
Richard Smith586cd942014-03-04 20:22:54579 <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3929.pdf">N3929</a></td>
Richard Smith3a0ed872014-02-15 00:29:00580 <td class="none" align="center">No</td>
581 </tr>
Richard Smith91e474f2013-11-27 22:58:16582</table>
583
Cedric Venet084381332009-02-14 20:20:19584</div>
585</body>
586</html>