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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++17</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="https://bugs.llvm.org/">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/standard/50372.html">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>    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>    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 rowspan="2">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> <!-- from Kona 2019-->
112	<td><a href="http://wg21.link/p1009r2">P1009R2</a> (<a href="#dr">DR</a>)</td>
113	<td class="none" align="center">No</td>
114	</tr>
115	<tr>
116	<td>Static assertions</td>
117	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.html">N1720</a></td>
118	<td class="full" align="center">Clang 2.9</td>
119	</tr>
120	<tr>
121	<td><code>auto</code>-typed variables</td>
122	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf">N1984</a></td>
123	<td class="full" align="center">Clang 2.9</td>
124	</tr>
125	<tr>
126	<td>    Multi-declarator <code>auto</code></td>
127	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1737.pdf">N1737</a></td>
128	<td class="full" align="center">Clang 2.9</td>
129	</tr>
130	<tr>
131	<td>    Removal of auto as a storage-class specifier</td>
132	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2546.htm">N2546</a></td>
133	<td class="full" align="center">Clang 2.9</td>
134	</tr>
135	<tr>
136	<td>    New function declarator syntax</td>
137	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2541.htm">N2541</a></td>
138	<td class="full" align="center">Clang 2.9</td>
139	</tr>
140	<tr>
141	<td rowspan="2">Lambda expressions</td>
142	<td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2927.pdf">N2927</a></td>
143	<td class="full" align="center">Clang 3.1</td>
144	</tr>
145	<tr>
146	<!-- from Albuquerque 2017 -->
147	<td><a href="http://wg21.link/p0588r1">P0588R1</a> (<a href="#dr">DR</a>)</td>
148	<td class="none" align="center">No</td>
149	</tr>
150	<tr>
151	<td>Declared type of an expression</td>
152	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a></td>
153	<td class="full" align="center">Clang 2.9</td>
154	</tr>
155	<tr>
156	<td>    Incomplete return types</td>
157	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3276.pdf">N3276</a></td>
158	<td class="full" align="center">Clang 3.1</td>
159	</tr>
160	<tr>
161	<td>Right angle brackets</td>
162	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a></td>
163	<td class="full" align="center">Clang 2.9</td>
164	</tr>
165	<tr>
166	<td>Default template arguments for function templates</td>
167	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#226">DR226</a></td>
168	<td class="full" align="center">Clang 2.9</td>
169	</tr>
170	<tr>
171	<td>Solving the SFINAE problem for expressions</td>
172	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2634.html">DR339</a></td>
173	<td class="full" align="center">Clang 2.9</td>
174	</tr>
175	<tr>
176	<td>Alias templates</td>
177	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf">N2258</a></td>
178	<td class="full" align="center">Clang 3.0</td>
179	</tr>
180	<tr>
181	<td>Extern templates</td>
182	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1987.htm">N1987</a></td>
183	<td class="full" align="center">Clang 2.9</td>
184	</tr>
185	<tr>
186	<td>Null pointer constant</td>
187	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a></td>
188	<td class="full" align="center">Clang 3.0</td>
189	</tr>
190	<tr>
191	<td>Strongly-typed enums</td>
192	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf">N2347</a></td>
193	<td class="full" align="center">Clang 2.9</td>
194	</tr>
195	<tr>
196	<td>Forward declarations for enums</td>
197	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2764.pdf">N2764</a>
198	<br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1206">DR1206</a></td>
199	<td class="full" align="center">Clang 3.1</td>
200	</tr>
201	<tr>
202	<td>Standardized attribute syntax</td>
203	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2761.pdf">N2761</a></td>
204	<td class="full" align="center">Clang 3.3 <a href="#n2761">(1)</a></td>
205	</tr>
206	<tr>
207	<td rowspan="2">Generalized constant expressions</td>
208	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf">N2235</a></td>
209	<td class="full" align="center">Clang 3.1</td>
210	</tr>
211	<tr>
212	<!-- from Albuquerque 2017 -->
213	<td><a href="http://wg21.link/p0859r0">P0859R0</a> (<a href="#dr">DR</a>)</td>
214	<td class="svn" align="center">SVN</td>
215	</tr>
216	<tr>
217	<td>Alignment support</td>
218	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf">N2341</a></td>
219	<td class="full" align="center">Clang 3.3</td>
220	</tr>
221	<tr>
222	<td>Conditionally-support behavior</td>
223	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1627.pdf">N1627</a></td>
224	<td class="full" align="center">Clang 2.9</td>
225	</tr>
226	<tr>
227	<td>Changing undefined behavior into diagnosable errors</td>
228	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1727.pdf">N1727</a></td>
229	<td class="full" align="center">Clang 2.9</td>
230	</tr>
231	<tr>
232	<td>Delegating constructors</td>
233	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf">N1986</a></td>
234	<td class="full" align="center">Clang 3.0</td>
235	</tr>
236	<tr>
237	<td rowspan="2">Inheriting constructors</td>
238	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2540.htm">N2540</a></td>
239	<td class="full" align="center">Clang 3.3</td>
240	</tr>
241	<tr>
242	<!-- from Kona 2015 -->
243	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0136r1.html">P0136R1</a> (<a href="#dr">DR</a>)</td>
244	<td class="full" align="center">Clang 3.9</td>
245	</tr>
246	<tr>
247	<td>Explicit conversion operators</td>
248	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a></td>
249	<td class="full" align="center">Clang 3.0</td>
250	</tr>
251	<tr>
252	<td>New character types</td>
253	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2249.html">N2249</a></td>
254	<td class="full" align="center">Clang 2.9</td>
255	</tr>
256	<tr>
257	<td>Unicode string literals</td>
258	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
259	<td class="full" align="center">Clang 3.0</td>
260	</tr>
261	<tr>
262	<td>Raw string literals</td>
263	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td>
264	<td class="full" align="center">Clang 3.0</td>
265	</tr>
266	<tr>
267	<td>Universal character names in literals</td>
268	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2170.html">N2170</a></td>
269	<td class="full" align="center">Clang 3.1</td>
270	</tr>
271	<tr>
272	<td>User-defined literals</td>
273	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2765.pdf">N2765</a></td>
274	<td class="full" align="center">Clang 3.1</td>
275	</tr>
276	<tr>
277	<td>Standard Layout Types</td>
278	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2342.htm">N2342</a></td>
279	<td class="full" align="center">Clang 3.0</td>
280	</tr>
281	<tr>
282	<td rowspan="2">Defaulted functions</td>
283	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
284	<td class="full" align="center">Clang 3.0</td>
285	</tr>
286	<tr> <!-- from Kona 2019-->
287	<td><a href="http://wg21.link/p1286r2">P1286R2</a> (<a href="#dr">DR</a>)</td>
288	<td class="none" align="center">No</td>
289	</tr>
290	<tr>
291	<td>Deleted functions</td>
292	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td>
293	<td class="full" align="center">Clang 2.9</td>
294	</tr>
295	<tr>
296	<td>Extended friend declarations</td>
297	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1791.pdf">N1791</a></td>
298	<td class="full" align="center">Clang 2.9</td>
299	</tr>
300	<tr>
301	<td>Extending <code>sizeof</code></td>
302	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2253.html">N2253</a>
303	<br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#850">DR850</a></td>
304	<td class="full" align="center">Clang 3.1</td>
305	</tr>
306	<tr>
307	<td>Inline namespaces</td>
308	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2535.htm">N2535</a></td>
309	<td class="full" align="center">Clang 2.9</td>
310	</tr>
311	<tr>
312	<td>Unrestricted unions</td>
313	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2544.pdf">N2544</a></td>
314	<td class="full" align="center">Clang 3.1</td>
315	</tr>
316	<tr>
317	<td>Local and unnamed types as template arguments</td>
318	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm">N2657</a></td>
319	<td class="full" align="center">Clang 2.9</td>
320	</tr>
321	<tr>
322	<td rowspan="2">Range-based for</td>
323	<td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2930.html">N2930</a></td>
324	<td class="full" align="center">Clang 3.0</td>
325	</tr>
326	<tr>
327	<!-- from Jacksonville 2018 -->
328	<td><a href="http://wg21.link/p0962r1">P0962R1</a> (<a href="#dr">DR</a>)</td>
329	<td class="svn" align="center">SVN</td>
330	</tr>
331	<tr>
332	<td>Explicit virtual overrides</td>
333	<td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2928.htm">N2928</a>
334	<br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3206.htm">N3206</a>
335	<br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3272.htm">N3272</a></td>
336	<td class="full" align="center">Clang 3.0</td>
337	</tr>
338	<tr>
339	<td>Minimal support for garbage collection and reachability-based leak detection</td>
340	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2670.htm">N2670</a></td>
341	<td class="na" align="center">N/A <a href="#n2670">(2)</a></td>
342	</tr>
343	<tr>
344	<td>Allowing move constructors to throw [noexcept]</td>
345	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3050.html">N3050</a></td>
346	<td class="full" align="center">Clang 3.0</td>
347	</tr>
348	<tr>
349	<td>Defining move special member functions</td>
350	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3053.html">N3053</a></td>
351	<td class="full" align="center">Clang 3.0</td>
352	</tr>
353
354	<tr class="separator">
355	<th align="center" colspan="3">Concurrency</th>
356	</tr>
357	<tr>
358	<td>Sequence points</td>
359	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2239.html">N2239</a></td>
360	<td class="full" align="center">Clang 3.3</td>
361	</tr>
362	<tr>
363	<td>Atomic operations</td>
364	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html">N2427</a></td>
365	<td class="full" align="center">Clang 3.1</td>
366	</tr>
367	<tr>
368	<td>Strong Compare and Exchange</td>
369	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2748.html">N2748</a></td>
370	<td class="full" align="center">Clang 3.1 <a href="#n2748">(3)</a></td>
371	</tr>
372	<tr>
373	<td>Bidirectional Fences</td>
374	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2752.htm">N2752</a></td>
375	<td class="full" align="center">Clang 3.1</td>
376	</tr>
377
378	<tr>
379	<td>Memory model</td>
380	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2429.htm">N2429</a></td>
381	<td class="full" align="center">Clang 3.2</td>
382	</tr>
383	<tr>
384	<td>Data-dependency ordering: atomics and memory model</td>
385	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2664.htm">N2664</a></td>
386	<td class="full" align="center">Clang 3.2 <a href="#n2664">(4)</a></td>
387	</tr>
388	<tr>
389	<td>Propagating exceptions</td>
390	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html">N2179</a></td>
391	<td class="full" align="center">Clang 2.9</td>
392	</tr>
393	<tr>
394	<td>Allow atomics use in signal handlers</td>
395	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2547.htm">N2547</a></td>
396	<td class="full" align="center">Clang 3.1</td>
397	</tr>
398	<tr>
399	<td>Thread-local storage</td>
400	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2659.htm">N2659</a></td>
401	<td class="full" align="center">Clang 3.3 <a href="#n2659">(5)</a></td>
402	</tr>
403	<tr>
404	<td>Dynamic initialization and destruction with concurrency</td>
405	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">N2660</a></td>
406	<td class="full" align="center">Clang 2.9</td>
407	</tr>
408
409	<tr class="separator">
410	<th align="center" colspan="3">C99 Features in C++11</th>
411	</tr>
412	<tr>
413	<td><code>__func__</code> predefined identifier</td>
414	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2340.htm">N2340</a></td>
415	<td class="full" align="center">Clang 2.9</td>
416	</tr>
417	<tr>
418	<td>C99 preprocessor</td>
419	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1653.htm">N1653</a></td>
420	<td class="full" align="center">Clang 2.9</td>
421	</tr>
422	<tr>
423	<td><code>long long</code></td>
424	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1811.pdf">N1811</a></td>
425	<td class="full" align="center">Clang 2.9</td>
426	</tr>
427	<tr>
428	<td>Extended integral types</td>
429	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1988.pdf">N1988</a></td>
430	<td class="na" align="center">N/A <a href="#n1988">(6)</a></td>
431	</tr>
432	</table>
433
434	<p>
435	<span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute
436	has no effect.</span><br>
437	<span id="n2670">(2): No compiler changes are required for an implementation
438	such as Clang that does not provide garbage collection.</span><br>
439	<span id="n2748">(3): All compare-exchange operations are emitted as
440	strong compare-exchanges.</span><br>
441	<span id="n2664">(4): <code>memory_order_consume</code> is lowered to
442	<code>memory_order_acquire</code>.</span><br>
443	<span id="n2659">(5): <code>thread_local</code> support
444	requires a C++ runtime library providing <code>__cxa_thread_atexit</code>, such
445	as <a href="http://libcxxabi.llvm.org">libc++abi</a> 3.6 or later,
446	or libsupc++ 4.8 or later.</span><br>
447	<span id="n1988">(6): No compiler changes are required for an implementation
448	such as Clang that does not provide any extended integer types.
449	<code>__int128</code> is not treated as an extended integer type,
450	because changing <code>intmax_t</code> would be an ABI-incompatible
451	change.</span>
452	</p>
453	</details>
454
455	<h2 id="cxx14">C++14 implementation status</h2>
456
457	<p>Clang 3.4 and later implement all of the <a
458	href="http://www.iso.org/standard/64029.html">ISO
459	C++ 2014 standard</a>.
460
461	<p>You can use Clang in C++14 mode with the <code>-std=c++14</code> option
462	(use <code>-std=c++1y</code> in Clang 3.4 and earlier).</p>
463
464	<details>
465	<summary>List of features and minimum Clang version with support</summary>
466
467	<table width="689" border="1" cellspacing="0">
468	<tr>
469	<th>Language Feature</th>
470	<th>C++14 Proposal</th>
471	<th>Available in Clang?</th>
472	</tr>
473	<tr>
474	<td>Tweak to certain C++ contextual conversions</td>
475	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3323.pdf">N3323</a></td>
476	<td class="full" align="center">Clang 3.4</td>
477	</tr>
478	<tr>
479	<td>Binary literals</td>
480	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3472.pdf">N3472</a></td>
481	<td class="full" align="center">Clang 2.9</td>
482	</tr>
483	<tr>
484	<td>decltype(auto)</td>
485	<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>
486	<td class="full" align="center">Clang 3.3</td>
487	</tr>
488	<tr>
489	<td>Return type deduction for normal functions</td>
490	<td class="full" align="center">Clang 3.4</td>
491	</tr>
492	<tr>
493	<td>Initialized lambda captures</td>
494	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3648.html">N3648</a></td>
495	<td class="full" align="center">Clang 3.4</td>
496	</tr>
497	<tr>
498	<td>Generic lambdas</td>
499	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3649.html">N3649</a></td>
500	<td class="full" align="center">Clang 3.4</td>
501	</tr>
502	<tr>
503	<td>Variable templates</td>
504	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3651.pdf">N3651</a></td>
505	<td class="full" align="center">Clang 3.4</td>
506	</tr>
507	<tr>
508	<td>Relaxing requirements on constexpr functions</td>
509	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3652.html">N3652</a></td>
510	<td class="full" align="center">Clang 3.4</td>
511	</tr>
512	<tr>
513	<td>Member initializers and aggregates</td>
514	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3653.html">N3653</a></td>
515	<td class="full" align="center">Clang 3.3</td>
516	</tr>
517	<tr>
518	<td>Clarifying memory allocation</td>
519	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3664.html">N3664</a></td>
520	<td class="full" align="center">Clang 3.4</td>
521	</tr>
522	<tr>
523	<td><tt>[[deprecated]]</tt> attribute</td>
524	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3760.html">N3760</a></td>
525	<td class="full" align="center">Clang 3.4</td>
526	</tr>
527	<tr>
528	<td>Single quotation mark as digit separator</td>
529	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3781.pdf">N3781</a></td>
530	<td class="full" align="center">Clang 3.4</td>
531	</tr>
532	<tr>
533	<td>C++ Sized Deallocation</td>
534	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3778.html">N3778</a></td>
535	<td class="full" align="center">Clang 3.4 <a href="#n3778">(7)</a></td>
536	</tr>
537	</table>
538
539	<p>
540	<span id="n3778">(7): In Clang 3.7 and later, sized deallocation is only enabled
541	if the user passes the <code>-fsized-deallocation</code> flag. The user must
542	supply definitions of the sized deallocation functions, either by providing them
543	explicitly or by using a C++ standard library that does. <code>libstdc++</code>
544	added these functions in version 5.0, and <code>libc++</code> added them in
545	version 3.7.
546	</span>
547	</p>
548	</details>
549
550	<h2 id="cxx17">C++17 implementation status</h2>
551
552	<p>Clang 5 and later implement all the features of the
553	<a href="https://www.iso.org/standard/68564.html">ISO C++ 2017 standard</a>.
554
555	<p>You can use Clang in C++17 mode with the <code>-std=c++17</code> option
556	(use <code>-std=c++1z</code> in Clang 4 and earlier).</p>
557
558	<details open>
559	<summary>List of features and minimum Clang version with support</summary>
560
561	<table width="689" border="1" cellspacing="0">
562	<tr>
563	<th>Language Feature</th>
564	<th>C++17 Proposal</th>
565	<th>Available in Clang?</th>
566	</tr>
567	<!-- Issaquah 2014 papers -->
568	<tr>
569	<td><tt>static_assert</tt> with no message</td>
570	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3928.pdf">N3928</a></td>
571	<td class="full" align="center">Clang 3.5</td>
572	</tr>
573	<!-- Rapperswil papers -->
574	<tr>
575	<td>Disabling trigraph expansion by default</td>
576	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4086.html">N4086</a></td>
577	<td class="full" align="center">Clang 3.5</td>
578	</tr>
579	<!--
580	<tr>
581	<td rowspan="2">Terse range-based for loops (removed from C++17)</td>
582	<td rowspan="2"><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3994.htm">N3994</a></td>
583	<td class="none" align="center">Clang 3.5: Yes</td>
584	</tr>
585	<tr>
586	<td class="svn" align="center">SVN: No</td>
587	</tr>
588	-->
589	<tr>
590	<td><tt>typename</tt> in a template template parameter</td>
591	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4051.html">N4051</a></td>
592	<td class="full" align="center">Clang 3.5</td>
593	</tr>
594	<tr>
595	<td>New <tt>auto</tt> rules for direct-list-initialization
596	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3922.html">N3922</a></td>
597	<td class="full" align="center">Clang 3.8 <a href="#n3922">(8)</a></td>
598	</tr>
599	<!-- Urbana papers -->
600	<tr>
601	<td rowspan="2">Fold expressions</td>
602	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4295.html">N4295</a></td>
603	<td class="full" align="center">Clang 3.6</td>
604	</tr>
605	<tr> <!-- from Jacksonville -->
606	<td><a href="http://wg21.link/p0036r0">P0036R0</a></td>
607	<td class="full" align="center">Clang 3.9</td>
608	</tr>
609	<tr>
610	<td><tt>u8</tt> character literals</td>
611	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4267.html">N4267</a></td>
612	<td class="full" align="center">Clang 3.6</td>
613	</tr>
614	<tr>
615	<td>Nested namespace definition</td>
616	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4230.html">N4230</a></td>
617	<td class="full" align="center">Clang 3.6</td>
618	</tr>
619	<tr>
620	<td>Attributes for namespaces and enumerators</td>
621	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4266.html">N4266</a></td>
622	<td class="full" align="center">Clang 3.6</td>
623	</tr>
624	<tr>
625	<td>Allow constant evaluation for all non-type template arguments</td>
626	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4268.html">N4268</a></td>
627	<td class="full" align="center">Clang 3.6</td>
628	</tr>
629	<!-- Kona papers -->
630	<tr>
631	<td>Remove deprecated <tt>register</tt> storage class</td>
632	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0001r1.html">P0001R1</a></td>
633	<td class="full" align="center">Clang 3.8</td>
634	</tr>
635	<tr>
636	<td>Remove deprecated <tt>bool</tt> increment</td>
637	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0002r1.html">P0002R1</a></td>
638	<td class="full" align="center">Clang 3.8</td>
639	</tr>
640	<tr>
641	<td>Make exception specifications part of the type system</td>
642	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0012r1.html">P0012R1</a></td>
643	<td class="full" align="center">Clang 4</td>
644	</tr>
645	<tr>
646	<td><tt>__has_include</tt> in preprocessor conditionals</td>
647	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0061.html">P0061R1</a></td>
648	<td class="full" align="center">Yes</td>
649	</tr>
650	<!-- Jacksonville papers -->
651	<tr>
652	<td><tt>[[fallthrough]]</tt> attribute</td>
653	<td><a href="http://wg21.link/p0188r1">P0188R1</a></td>
654	<td class="full" align="center">Clang 3.9</td>
655	</tr>
656	<tr>
657	<td><tt>[[nodiscard]]</tt> attribute</td>
658	<td><a href="http://wg21.link/p0189r1">P0189R1</a></td>
659	<td class="full" align="center">Clang 3.9</td>
660	</tr>
661	<tr>
662	<td><tt>[[maybe_unused]]</tt> attribute</td>
663	<td><a href="http://wg21.link/p0212r1">P0212R1</a></td>
664	<td class="full" align="center">Clang 3.9</td>
665	</tr>
666	<tr>
667	<td>Aggregate initialization of classes with base classes</td>
668	<td><a href="http://wg21.link/p0017r1">P0017R1</a></td>
669	<td class="full" align="center">Clang 3.9</td>
670	</tr>
671	<tr>
672	<td><tt>constexpr</tt> lambda expressions</td>
673	<td><a href="http://wg21.link/p0170r1">P0170R1</a></td>
674	<td class="full" align="center">Clang 5</td>
675	</tr>
676	<tr>
677	<td>Differing <tt>begin</tt> and <tt>end</tt> types in range-based <tt>for</tt></td>
678	<td><a href="http://wg21.link/p0184r0">P0184R0</a></td>
679	<td class="full" align="center">Clang 3.9</td>
680	</tr>
681	<tr>
682	<td>Lambda capture of <tt>*this</tt></td>
683	<td><a href="http://wg21.link/p0018r3">P0018R3</a></td>
684	<td class="full" align="center">Clang 3.9</td>
685	</tr>
686	<tr>
687	<td>Direct-list-initialization of <tt>enum</tt>s</td>
688	<td><a href="http://wg21.link/p0138r2">P0138R2</a></td>
689	<td class="full" align="center">Clang 3.9</td>
690	</tr>
691	<tr>
692	<td>Hexadecimal floating-point literals</td>
693	<td><a href="http://wg21.link/p0245r1">P0245R1</a></td>
694	<td class="full" align="center">Yes</td>
695	</tr>
696	<!-- Oulu papers -->
697	<tr>
698	<td>Using attribute namespaces without repetition</td>
699	<td><a href="http://wg21.link/p0028r4">P0028R4</a></td>
700	<td class="full" align="center">Clang 3.9</td>
701	</tr>
702	<tr>
703	<td>Dynamic memory allocation for over-aligned data</td>
704	<td><a href="http://wg21.link/p0035r4">P0035R4</a></td>
705	<td class="full" align="center">Clang 4</td>
706	</tr>
707	<tr>
708	<td rowspan="4">Template argument deduction for class templates</td>
709	<td><a href="http://wg21.link/p0091r3">P0091R3</a></td>
710	<td rowspan="2" class="full" align="center">Clang 5</td>
711	</tr>
712	<tr> <!-- from Issaquah -->
713	<td><a href="http://wg21.link/p0512r0">P0512R0</a></td>
714	</tr>
715	<tr>
716	<!-- from Kona 2017 -->
717	<td><a href="http://wg21.link/p0620r1">P0620R0</a> (<a href="#dr">DR</a>)</td>
718	<td class="full" align="center">Clang 7</td>
719	</tr>
720	<tr>
721	<!-- from Toronto 2017 -->
722	<td><a href="http://wg21.link/p0702r1">P0702R1</a> (<a href="#dr">DR</a>)</td>
723	<td class="full" align="center">Clang 6</td>
724	</tr>
725	<tr>
726	<td>Non-type template parameters with <tt>auto</tt> type</td>
727	<td><a href="http://wg21.link/p0127r2">P0127R2</a></td>
728	<td class="full" align="center">Clang 4</td>
729	</tr>
730	<tr>
731	<td>Guaranteed copy elision</td>
732	<td><a href="http://wg21.link/p0135r1">P0135R1</a></td>
733	<td class="full" align="center">Clang 4</td>
734	</tr>
735	<tr>
736	<td rowspan=2>Stricter expression evaluation order</td>
737	<td><a href="http://wg21.link/p0145r3">P0145R3</a></td>
738	<td class="full" align="center" rowspan=2>Clang 4 <a href="#p0145">(9)</a></td>
739	</tr>
740	<tr>
741	<td><a href="http://wg21.link/p0400r0">P0400R0</a></td>
742	</tr>
743	<tr>
744	<td>Requirement to ignore unknown attributes</td>
745	<td><a href="http://wg21.link/p0283r2">P0283R2</a></td>
746	<td class="full" align="center">Yes</td>
747	</tr>
748	<tr>
749	<td><tt>constexpr</tt> <em>if-statement</em>s</td>
750	<td><a href="http://wg21.link/p0292r2">P0292R2</a></td>
751	<td class="full" align="center">Clang 3.9</td>
752	</tr>
753	<tr>
754	<td>Inline variables</td>
755	<td><a href="http://wg21.link/p0386r2">P0386R2</a></td>
756	<td class="full" align="center">Clang 3.9</td>
757	</tr>
758	<tr>
759	<td rowspan="3">Structured bindings</td>
760	<td><a href="http://wg21.link/p0217r3">P0217R3</a></td>
761	<td class="full" align="center">Clang 4</td>
762	</tr>
763	<tr>
764	<!-- from Jacksonville 2018 -->
765	<td><a href="http://wg21.link/p0961r1">P0961R1</a> (<a href="#dr">DR</a>)</td>
766	<td class="svn" align="center">SVN</td>
767	</tr>
768	<tr>
769	<!-- from Jacksonville 2018 -->
770	<td><a href="http://wg21.link/p0969r0">P0969R0</a> (<a href="#dr">DR</a>)</td>
771	<td class="svn" align="center">SVN</td>
772	</tr>
773	<tr>
774	<td>Separate variable and condition for <tt>if</tt> and <tt>switch</tt></td>
775	<td><a href="http://wg21.link/p0305r1">P0305R1</a></td>
776	<td class="full" align="center">Clang 3.9</td>
777	</tr>
778	<!-- Issaquah 2016 papers -->
779	<tr>
780	<td>Matching template template parameters to compatible arguments</td>
781	<td><a href="http://wg21.link/p0522r0">P0522R0</a></td>
782	<td class="partial" align="center">Partial <a href="#p0522">(10)</a></td>
783	</tr>
784	<tr>
785	<td>Removing deprecated dynamic exception specifications</td>
786	<td><a href="http://wg21.link/p0003r5">P0003R5</a></td>
787	<td class="full" align="center">Clang 4</td>
788	</tr>
789	<tr>
790	<td>Pack expansions in <em>using-declarations</em></td>
791	<td><a href="http://wg21.link/p0195r2">P0195R2</a></td>
792	<td class="full" align="center">Clang 4</td>
793	</tr>
794	</table>
795
796	<p>
797	<span id="n3922">(8): This is a backwards-incompatible change that is applied to
798	all language versions that allow type deduction from <tt>auto</tt>
799	(per the request of the C++ committee).
800	In Clang 3.7, a warning is emitted for all cases that would change meaning.
801	</span><br>
802	<span id="p0145">(9): Under the MS ABI, function parameters are destroyed from
803	left to right in the callee. As a result, function parameters in calls to
804	<tt>operator<<</tt>, <tt>operator>></tt>, <tt>operator->*</tt>,
805	<tt>operator&&</tt>, <tt>operator\|\|</tt>, and <tt>operator,</tt>
806	functions using expression syntax are no longer guaranteed to be destroyed in
807	reverse construction order in that ABI.
808	</span><br>
809	<span id="p0522">(10): Despite being the resolution to a Defect Report, this
810	feature is disabled by default in all language versions, and can be enabled
811	explicitly with the flag <tt>-frelaxed-template-template-args</tt> in Clang 4
812	onwards.
813	The change to the standard lacks a corresponding change for template partial
814	ordering, resulting in ambiguity errors for reasonable and previously-valid
815	code. This issue is expected to be rectified soon.
816	</span>
817	</p>
818	</details>
819
820	<h2 id="cxx20">C++2a implementation status</h2>
821
822	<p>Clang has <b>experimental</b> support for some proposed features of
823	the C++ standard following C++17, provisionally named C++2a.
824	Note that support for these features may change or be removed without notice,
825	as the draft C++2a standard evolves.
826
827	<p>You can use Clang in C++2a mode with the <code>-std=c++2a</code> option.</p>
828
829	<details open>
830	<summary>List of features and minimum Clang version with support</summary>
831
832	<table width="689" border="1" cellspacing="0">
833	<tr>
834	<th>Language Feature</th>
835	<th>C++2a Proposal</th>
836	<th>Available in Clang?</th>
837	</tr>
838	<!-- Toronto 2017 papers -->
839	<tr>
840	<td>Default member initializers for bit-fields</td>
841	<td><a href="http://wg21.link/p0683r1">P0683R1</a></td>
842	<td class="full" align="center">Clang 6</td>
843	</tr>
844	<tr>
845	<td><tt>const&</tt>-qualified pointers to members</td>
846	<td><a href="http://wg21.link/p0704r1">P0704R1</a></td>
847	<td class="full" align="center">Clang 6</td>
848	</tr>
849	<tr>
850	<td>Allow <i>lambda-capture</i> <tt>[=, this]</tt></td>
851	<td><a href="http://wg21.link/p0409r2">P0409R2</a></td>
852	<td class="full" align="center">Clang 6</td>
853	</tr>
854	<tr>
855	<td rowspan="2"><tt>__VA_OPT__</tt> for preprocessor comma elision</td>
856	<td><a href="http://wg21.link/p0306r4">P0306R4</a></td>
857	<td class="full" align="center">Clang 6</td>
858	</tr>
859	<tr> <!-- from Rapperswil -->
860	<td><a href="http://wg21.link/p1042r1">P1042R1</a></td>
861	<td class="partial" align="center">Partial</td>
862	</tr>
863	<tr>
864	<td>Designated initializers</td>
865	<td><a href="http://wg21.link/p0329r4">P0329R4</a></td>
866	<td class="partial" align="center">Partial (extension)</td>
867	</tr>
868	<tr>
869	<td><i>template-parameter-list</i> for generic lambdas</td>
870	<td><a href="http://wg21.link/p0428r2">P0428R2</a></td>
871	<td class="none" align="center">No</td>
872	</tr>
873	<tr id="p0734">
874	<td rowspan="4">Concepts</td>
875	<td><a href="http://wg21.link/p0734r0">P0734R0</a></td>
876	<td rowspan="4" class="none" align="center">No</td>
877	</tr>
878	<tr> <!-- from Albuquerque -->
879	<td><a href="http://wg21.link/p0857r0">P0857R0</a></td>
880	</tr>
881	<tr> <!-- from San Diego -->
882	<td><a href="http://wg21.link/p1084r2">P1084R2</a></td>
883	</tr>
884	<tr>
885	<td><a href="http://wg21.link/p1141r2">P1414R2</a></td>
886	</tr>
887	<!-- Albuquerque papers -->
888	<tr>
889	<td>Range-based for statements with initializer</td>
890	<td><a href="http://wg21.link/p0614r1">P0614R1</a></td>
891	<td class="svn" align="center">SVN</td>
892	</tr>
893	<tr>
894	<td>ADL and function templates that are not visible</td>
895	<td><a href="http://wg21.link/p0846r0">P0846R0</a></td>
896	<td class="none" align="center">No</td>
897	</tr>
898	<tr>
899	<td><tt>const</tt> mismatch with defaulted copy constructor</td>
900	<td><a href="http://wg21.link/p0641r2">P0641R2</a></td>
901	<td class="svn" align="center">SVN</td>
902	</tr>
903	<tr>
904	<td rowspan="4">Consistent comparison (<tt>operator<=></tt>)</td>
905	<td><a href="http://wg21.link/p0515r3">P0515R3</a></td>
906	<td rowspan="3" class="partial" align="center">Partial</td>
907	</tr>
908	<tr> <!-- from Jacksonville -->
909	<td><a href="http://wg21.link/p0905r1">P0905R1</a></td>
910	</tr>
911	<tr> <!-- from Rapperswil -->
912	<td><a href="http://wg21.link/p1120r0">P1120R0</a></td>
913	</tr>
914	<tr> <!-- from Kona 2019 -->
915	<td><a href="http://wg21.link/p1185r2">P1185R2</a></td>
916	<td class="none" align="center">No</td>
917	</tr>
918	<tr>
919	<td>Access checking on specializations</td>
920	<td><a href="http://wg21.link/p0692r1">P0692R1</a></td>
921	<td class="partial" align="center">Partial</td>
922	</tr>
923	<tr>
924	<td>Default constructible and assignable stateless lambdas</td>
925	<td><a href="http://wg21.link/p0624r2">P0624R2</a></td>
926	<td class="svn" align="center">SVN</td>
927	</tr>
928	<tr>
929	<td>Lambdas in unevaluated contexts</td>
930	<td><a href="http://wg21.link/p0315r4">P0315R4</a></td>
931	<td class="none" align="center">No</td>
932	</tr>
933	<!-- Jacksonville papers -->
934	<tr>
935	<td><tt>[[no_unique_address]]</tt> attribute</td>
936	<td><a href="http://wg21.link/p0840r2">P0840R2</a></td>
937	<td class="none" align="center">No</td>
938	</tr>
939	<tr>
940	<td><tt>[[likely]]</tt> and <tt>[[unlikely]]</tt> attributes</td>
941	<td><a href="http://wg21.link/p0479r5">P0479R5</a></td>
942	<td class="none" align="center">No</td>
943	</tr>
944	<tr>
945	<td><tt>typename</tt> optional in more contexts</td>
946	<td><a href="http://wg21.link/p0634r3">P0634R3</a></td>
947	<td class="none" align="center">No</td>
948	</tr>
949	<tr>
950	<td>Pack expansion in lambda <i>init-capture</i></td>
951	<td><a href="http://wg21.link/p0780r2">P0780R2</a></td>
952	<td class="none" align="center">No</td>
953	</tr>
954	<!-- Rapperswil papers -->
955	<tr>
956	<td>Class types as non-type template parameters</td>
957	<td><a href="http://wg21.link/p0732r2">P0732R2</a></td>
958	<td class="none" align="center">No</td>
959	</tr>
960	<tr>
961	<td>Destroying operator delete</td>
962	<td><a href="http://wg21.link/p0722r3">P0722R3</a></td>
963	<td class="full" align="center">Clang 6</td>
964	</tr>
965	<tr>
966	<td rowspan=4>Relaxations of <tt>constexpr</tt> restrictions</td>
967	<td><a href="http://wg21.link/p1064r0">P1064R0</a></td>
968	<td class="none" align="center">No</td>
969	</tr>
970	<tr> <!-- from San Diego -->
971	<td><a href="http://wg21.link/p1002r1">P1002R1</a></td>
972	<td class="full" align="center">SVN</td>
973	</tr>
974	<tr>
975	<td><a href="http://wg21.link/p1327r1">P1327R1</a></td>
976	<td rowspan=2 class="none" align="center">No</td>
977	</tr>
978	<tr>
979	<td><a href="http://wg21.link/p1330r0">P1330R0</a></td>
980	</tr>
981	<tr>
982	<td>Prohibit aggregates with user-declared constructors</td>
983	<td><a href="http://wg21.link/p1008r1">P1008R1</a></td>
984	<td class="svn" align="center">SVN</td>
985	</tr>
986	<tr>
987	<td rowspan="3">Contracts</td>
988	<td><a href="http://wg21.link/p0542r5">P0542R5</a></td>
989	<td rowspan="3" class="none" align="center">No</td>
990	</tr>
991	<tr> <!-- from San Diego -->
992	<td><a href="http://wg21.link/p1289r1">P1289R1</a></td>
993	</tr>
994	<tr> <!-- from Kona 2019-->
995	<td><a href="http://wg21.link/p1323r2">P1323R2</a></td>
996	</tr>
997	<tr>
998	<td>Feature test macros</td>
999	<td><a href="http://wg21.link/p0941r2">P0941R2</a></td>
1000	<td class="full" align="center"><a href="#sd6">(see below)</a></td>
1001	</tr>
1002	<tr>
1003	<td><tt>explicit(bool)</tt></td>
1004	<td><a href="http://wg21.link/p0892r2">P0892R2</a></td>
1005	<td class="none" align="center">No</td>
1006	</tr>
1007	<!-- San Diego papers -->
1008	<tr>
1009	<td>Signed integers are two's complement</td>
1010	<td><a href="http://wg21.link/p1236r1">P1236R1</a></td>
1011	<td class="none" align="center">No</td>
1012	</tr>
1013	<tr>
1014	<td><tt>char8_t</tt></td>
1015	<td><a href="http://wg21.link/p0482r6">P0482R6</a></td>
1016	<td class="full" align="center">Clang 7 <a href="#p0482">(11)</a></td>
1017	</tr>
1018	<tr>
1019	<td>Immediate functions (<tt>consteval</tt>)</td>
1020	<td><a href="http://wg21.link/p1073r3">P1073R3</a></td>
1021	<td class="none" align="center">No</td>
1022	</tr>
1023	<tr>
1024	<td><tt>std::is_constant_evaluated</tt></td>
1025	<td><a href="http://wg21.link/p0595r2">P0595R2</a></td>
1026	<td class="none" align="center">No</td>
1027	</tr>
1028	<tr>
1029	<td>Nested inline namespaces</td>
1030	<td><a href="http://wg21.link/p1094r2">P1094R2</a></td>
1031	<td class="svn" align="center">SVN</td>
1032	</tr>
1033	<!-- Kona 2019 papers -->
1034	<tr>
1035	<td rowspan="2">Structured binding extensions</td>
1036	<td><a href="http://wg21.link/p1091r3">P1091R3</a></td>
1037	<td rowspan="2" class="none" align="center">No</td>
1038	</tr>
1039	<tr>
1040	<td><a href="http://wg21.link/p1381r1">P1381R1</a></td>
1041	</tr>
1042	<tr>
1043	<td rowspan="2">Stronger Unicode requirements</td>
1044	<td><a href="http://wg21.link/p1041r4">P1041R4</a></td>
1045	<td rowspan="2" class="full" align="center">Yes</td>
1046	</tr>
1047	<tr>
1048	<td><a href="http://wg21.link/p1139r2">P1139R2</a></td>
1049	</tr>
1050	<tr>
1051	<td>Parenthesized initialization of aggregates</td>
1052	<td><a href="http://wg21.link/p0960r3">P0960R3</a></td>
1053	<td class="none" align="center">No</td>
1054	</tr>
1055	<tr>
1056	<td>Modules</td>
1057	<td><a href="http://wg21.link/p1103r3">P1103R3</a></td>
1058	<td class="partial" align="center">Partial (<tt>-fmodules</tt>, <tt>-fmodules-ts</tt>)</td>
1059	</tr>
1060	<tr>
1061	<td>Coroutines</td>
1062	<td><a href="http://wg21.link/p0912r5">P0912R5</a></td>
1063	<td class="partial" align="center">Partial</td>
1064	</tr>
1065	</table>
1066
1067	<p>
1068	<span id="p0482">(11): Prior to Clang 8, this feature is not enabled by
1069	<tt>-std=c++2a</tt>, but can be enabled with <tt>-fchar8_t</tt>.
1070	</span>
1071	</p>
1072	</details>
1073
1074	<h2 id="dr">Defect reports</h2>
1075
1076	<p>Clang generally aims to implement resolutions to Defect Reports (bug fixes
1077	against prior standards) retroactively, in all prior standard versions where
1078	the fix is meaningful. Significant Defect Report changes to language features
1079	after the publication of the relevant standard are marked (DR) in the above
1080	table.</p>
1081
1082	<p>Clang also has a test suite for conformance to resolutions for issues on the
1083	<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_toc.html">C++ core issues list</a>,
1084	most of which are considered Defect Reports.
1085	<a href="cxx_dr_status.html">Implementation status for C++ core issues</a> based on
1086	that test suite is tracked on a separate page.</p>
1087
1088	<h2 id="ts">Technical specifications and standing documents</h2>
1089
1090	<p>ISO C++ also publishes a number of documents describing additional language
1091	and library features that are not part of standard C++.</p>
1092
1093	<details open>
1094	<summary>List of features and minimum Clang version with support</summary>
1095
1096	<table width="689" border="1" cellspacing="0">
1097	<tr>
1098	<th>Document</th>
1099	<th>Latest draft</th>
1100	<th>Compiler flag</th>
1101	<th>Available in Clang?</th>
1102	</tr>
1103	<tr id="sd6">
1104	<td rowspan="6">SD-6: SG10 feature test recommendations</td>
1105	<td rowspan="6"><a href="http://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6</a></td>
1106	<td rowspan="6">N/A</td>
1107	<td class="full" align="center">
1108	Clang 3.4 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3745">N3745</a>)</br>
1109	</td>
1110	</tr>
1111	<tr>
1112	<td class="full" align="center">
1113	Clang 3.6 (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4200">N4200</a>)</a>
1114	</td>
1115	</tr>
1116	<tr>
1117	<td class="full" align="center">
1118	Clang 4 (<a href="http://wg21.link/p0096r3">P0096R3</a>)</a>
1119	</td>
1120	</tr>
1121	<tr>
1122	<td class="full" align="center">
1123	Clang 5 (<a href="http://wg21.link/p0096r4">P0096R4</a>)</a>
1124	</td>
1125	</tr>
1126	<tr>
1127	<td class="full" align="center">
1128	Clang 7 (<a href="http://wg21.link/p0096r5">P0096R5</a>)</a>
1129	</td>
1130	</tr>
1131	<tr>
1132	<td class="partial" align="center">
1133	WIP (<a href="http://wg21.link/p1353r0">P1353R0</a>)
1134	</td>
1135	</tr>
1136	<!-- FIXME: Implement latest recommendations.
1137	<tr>
1138	<td class="svn" align="center">
1139	SVN (<a href="http://wg21.link/p0096r3">P0096R3</a>)</a>
1140	</td>
1141	</tr>
1142	-->
1143	<!-- No compiler support is known to be needed for:
1144	* Concurrency TS
1145	* Parallelism TS (v1, v2)
1146	* Ranges TS
1147	* Networking TS
1148	* File System TS
1149	-->
1150	<tr>
1151	<td>[TS] Concepts</td>
1152	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0121r0.pdf">P0121R0</a></td>
1153	<td></td>
1154	<td class="na" align="center">Superseded by <a href="#p0734">P0734R0</a></td>
1155	</tr>
1156	<tr>
1157	<!-- track unimplemented Coroutines features: p0913r1 p0914r1 p1356r0 -->
1158	<td rowspan="2">[TS] Coroutines</td>
1159	<td rowspan="2"><a href="https://isocpp.org/files/papers/N4663.pdf">N4663</a></td>
1160	<td><tt>-fcoroutines-ts<br>-stdlib=libc++</tt></td>
1161	<td class="full" align="center">Clang 5</td>
1162	</tr>
1163	<tr>
1164	<td><tt>-std=c++2a<br>-stdlib=libc++</tt></td>
1165	<td class="na" align="center">Superseded by <a href="#p0912">P0912R5</a></td>
1166	</tr>
1167	<tr>
1168	<td>[TS] Library Fundamentals, Version 1 (invocation type traits)</td>
1169	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4480.html">N4480</a></td>
1170	<td>N/A</td>
1171	<td class="none" align="center">No</td>
1172	</tr>
1173	<tr>
1174	<td>[TS] Library Fundamentals, Version 2 (<tt>source_location</tt>)</td>
1175	<td><a href="http://wg21.link/n4617">N4617</a></td>
1176	<td>N/A</td>
1177	<td class="none" align="center">No</td>
1178	</tr>
1179	<tr>
1180	<td>[TS] Modules</td>
1181	<td><a href="http://wg21.link/n4720">N4720</a></td>
1182	<td><tt>-fmodules-ts</tt></td>
1183	<td class="na" align="center">Superseded by <a href="#p1103">P1103R3</a></td>
1184	</tr>
1185	<tr>
1186	<td>[DRAFT TS] Reflection</td>
1187	<td><a href="http://wg21.link/n4746">N4746</a></td>
1188	<td></td>
1189	<td class="none" align="center">No</td>
1190	</tr>
1191	<tr>
1192	<td>[TS] Transactional Memory</td>
1193	<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4514.pdf">N4514</a></td>
1194	<td></td>
1195	<td class="none" align="center">No</td>
1196	</tr>
1197	</table>
1198	</details>
1199
1200	</div>
1201	</body>
1202	</html>
1203

Clang Project