Author: Corentin Jabot Date: 2023-05-16T08:52:44+02:00 New Revision: b9c0e590f1fd4ea37da5c2b9b78d8e715c885f56
URL: https://github.com/llvm/llvm-project/commit/b9c0e590f1fd4ea37da5c2b9b78d8e715c885f56 DIFF: https://github.com/llvm/llvm-project/commit/b9c0e590f1fd4ea37da5c2b9b78d8e715c885f56.diff LOG: [Clang][NFC] Present language version in descending publication date Added: Modified: clang/www/cxx_status.html Removed: ################################################################################ diff --git a/clang/www/cxx_status.html b/clang/www/cxx_status.html index 564c3d6a8c48c..91706be09f158 100755 --- a/clang/www/cxx_status.html +++ b/clang/www/cxx_status.html @@ -30,45 +30,45 @@ <h1>C++ Support in Clang</h1> <p>Clang implements the following published and upcoming ISO C++ standards:</p> <table width="689" border="1" cellspacing="0"> + <tr> + <th>Language Standard</th> + <th>Flag</th> + <th>Available in Clang?</th> + </tr> + <tr> + <td><a href="#cxx26">C++2c</a></td> + <td><tt>-std=c++2c</tt></td> + <td class="partial" align="center">Partial</td> + </tr> <tr> - <th>Language Standard</th> - <th>Flag</th> - <th>Available in Clang?</th> -</tr> -<tr> - <td><a href="#cxx98">C++98 / C++03</a></td> - <td><tt>-std=c++98</tt></td> - <td class="full" align="center">Yes (other than <tt>export</tt>)</td> -</tr> -<tr> - <td><a href="#cxx11">C++11</a></td> - <td><tt>-std=c++11</tt></td> - <td class="full" align="center">Clang 3.3</td> -</tr> -<tr> - <td><a href="#cxx14">C++14</a></td> - <td><tt>-std=c++14</tt></td> - <td class="full" align="center">Clang 3.4</td> -</tr> -<tr> - <td><a href="#cxx17">C++17</a></td> - <td><tt>-std=c++17</tt></td> - <td class="full" align="center">Clang 5</td> -</tr> -<tr> - <td><a href="#cxx20">C++20</a></td> - <td><tt>-std=c++20</tt></td> - <td class="partial" align="center">Partial</td> -</tr> -<tr> - <td><a href="#cxx23">C++23</a></td> - <td><tt>-std=c++23</tt></td> - <td class="partial" align="center">Partial</td> -</tr> -<tr> - <td><a href="#cxx26">C++2c</a></td> - <td><tt>-std=c++2c</tt></td> - <td class="partial" align="center">Partial</td> + <td><a href="#cxx23">C++23</a></td> + <td><tt>-std=c++23</tt></td> + <td class="partial" align="center">Partial</td> + </tr> + <tr> + <td><a href="#cxx20">C++20</a></td> + <td><tt>-std=c++20</tt></td> + <td class="partial" align="center">Partial</td> + </tr> + <tr> + <td><a href="#cxx17">C++17</a></td> + <td><tt>-std=c++17</tt></td> + <td class="full" align="center">Clang 5</td> + </tr> + <tr> + <td><a href="#cxx14">C++14</a></td> + <td><tt>-std=c++14</tt></td> + <td class="full" align="center">Clang 3.4</td> + </tr> + <tr> + <td><a href="#cxx11">C++11</a></td> + <td><tt>-std=c++11</tt></td> + <td class="full" align="center">Clang 3.3</td> + </tr> + <tr> + <td><a href="#cxx98">C++98 / C++03</a></td> + <td><tt>-std=c++98</tt></td> + <td class="full" align="center">Yes (other than <tt>export</tt>)</td> </tr> </table> @@ -85,513 +85,735 @@ <h1>C++ Support in Clang</h1> the "c++" label, as well as mode-specific labels such as "c++11", "c++14", and so on, to track known bugs with Clang's language conformance.</p> -<h2 id="cxx98">C++98 implementation status</h2> +<h2 id="cxx26">C++2c implementation status</h2> -<p>Clang implements all of the ISO C++ 1998 standard - (including the defects addressed in the ISO C++ 2003 standard) - except for <tt>export</tt> (which was removed in C++11). +<!-- TODO add link to the ISO Standard after it's published. --> +<p>Clang has support for some of the features of the C++ standard following +C++23, informally referred to as C++26.</p> -<h2 id="cxx11">C++11 implementation status</h2> +<p>You can use Clang in C++2c mode with the <code>-std=c++2c</code> option.</p> -<p>Clang 3.3 and later implement all of the <a - href="https://www.iso.org/standard/50372.html";>ISO - C++ 2011 standard</a>.</p> +<details open> +<summary>List of features and minimum Clang version with support</summary> +<table width="689" border="1" cellspacing="0"> + <tr> + <th>Language Feature</th> + <th>C++26 Proposal</th> + <th>Available in Clang?</th> + </tr> +</table> +</details> -<p>You can use Clang in C++11 mode with the <code>-std=c++11</code> -option. Clang's C++11 mode can be used with -<a href="https://libcxx.llvm.org/";>libc++</a> or with gcc's libstdc++.</p> -<details> +<h2 id="cxx23">C++23 implementation status</h2> + +<!-- TODO add link to the ISO Standard after it's published. --> +<p>Clang has support for some of the features of the ISO C++ 2023 standard.</p> + +<p>You can use Clang in C++23 mode with the <code>-std=c++23</code> option.</p> + +<details open> <summary>List of features and minimum Clang version with support</summary> <table width="689" border="1" cellspacing="0"> <tr> <th>Language Feature</th> - <th>C++11 Proposal</th> + <th>C++23 Proposal</th> <th>Available in Clang?</th> </tr> - <tr> - <td rowspan="2">Rvalue references</td> - <td><a href="https://wg21.link/n2118";>N2118</a></td> - <td class="full" align="center">Clang 2.9</td> - <tr> <!-- from Kona 2019--> - <td><a href="https://wg21.link/p1825r0";>P1825R0</a> (<a href="#dr">DR</a>)</td> - <td class="full" align="center">Clang 13</td> - </tr> - </tr> + <!-- Fall 2020 papers --> <tr> - <td> Rvalue references for <code>*this</code></td> - <td><a href="https://wg21.link/n2439";>N2439</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Literal suffix <tt>uz</tt>, <tt>z</tt> for <tt>size_t</tt>, <tt>ssize_t</tt></td> + <td><a href="https://wg21.link/p0330r8";>P0330R8</a></td> + <td class="full" align="center">Clang 13</td> </tr> + <!-- Spring 2021 papers --> <tr> - <td>Initialization of class objects by rvalues</td> - <td><a href="https://wg21.link/n1610";>N1610</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Make <tt>()</tt> in lambdas optional in all cases</td> + <td><a href="https://wg21.link/p1102r2";>P1102R2</a></td> + <td class="full" align="center">Clang 13</td> </tr> <tr> - <td>Non-static data member initializers</td> - <td><a href="https://wg21.link/n2756";>N2756</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>Simpler implicit move</td> + <td><a href="https://wg21.link/p2266r1";>P2266R1</a></td> + <td class="full" align="center">Clang 13</td> </tr> <tr> - <td>Variadic templates</td> - <td><a href="https://wg21.link/n2242";>N2242</a></td> - <td class="full" align="center">Clang 2.9</td> + <td><tt>if consteval</tt></td> + <td><a href="https://wg21.link/P1938R3";>P1938R3</a></td> + <td class="full" align="center">Clang 14</td> </tr> <tr> - <td> Extending variadic template template parameters</td> - <td><a href="https://wg21.link/n2555";>N2555</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Allow duplicate attributes</td> + <td><a href="https://wg21.link/P2156R1";>P2156R1</a></td> + <td class="full" align="center">Clang 13</td> </tr> <tr> - <td rowspan="3">Initializer lists</td> - <td><a href="https://wg21.link/n2672";>N2672</a></td> - <td class="full" align="center">Clang 3.1</td> + <td>Narrowing contextual conversions to bool</td> + <td><a href="https://wg21.link/P1401R5";>P1401R5</a></td> + <td class="full" align="center">Clang 14</td> </tr> - <tr> <!-- from Kona 2019--> - <td><a href="https://wg21.link/p1009r2";>P1009R2</a> (<a href="#dr">DR</a>)</td> - <td class="full" align="center">Clang 9</td> - </tr> - <tr> <!-- from Prague--> - <td><a href="https://wg21.link/p1957r2";>P1957R2</a> (<a href="#dr">DR</a>)</td> - <td class="full" align="center">Clang 11</td> - </tr> <tr> - <td>Static assertions</td> - <td><a href="https://wg21.link/n1720";>N1720</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Trimming whitespaces before line splicing</td> + <td><a href="https://wg21.link/P2223R2";>P2223R2</a></td> + <td class="full" align="center">Yes</td> </tr> <tr> - <td><code>auto</code>-typed variables</td> - <td><a href="https://wg21.link/n1984";>N1984</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Make declaration order layout mandated</td> + <td><a href="https://wg21.link/p1847r4";>P1874R4</a></td> + <td class="full" align="center">Yes</td> </tr> <tr> - <td> Multi-declarator <code>auto</code></td> - <td><a href="https://wg21.link/n1737";>N1737</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>C++ identifier syntax using UAX 31</td> + <td><a href="https://wg21.link/P1949R7";>P1949R7</a></td> + <td class="full" align="center">Clang 14</td> </tr> <tr> - <td> Removal of auto as a storage-class specifier</td> - <td><a href="https://wg21.link/n2546";>N2546</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Mixed string literal concatenation</td> + <td><a href="https://wg21.link/p2201r1";>P2201R1</a></td> + <td class="full" align="center">Yes</td> </tr> + <!-- October 2021 papers --> <tr> - <td> New function declarator syntax</td> - <td><a href="https://wg21.link/n2541";>N2541</a></td> - <td class="full" align="center">Clang 2.9</td> + <td rowspan=2>Deducing this</td> + <td><a href="https://wg21.link/P0847R7";>P0847R7</a></td> + <td class="none" align="center">No</td> </tr> <tr> - <td rowspan="2">Lambda expressions</td> - <td><a href="https://wg21.link/n2927";>N2927</a></td> - <td class="full" align="center">Clang 3.1</td> + <td><a href="https://wg21.link/P2797R0";>P2797R0</a></td> + <td class="none" align="center">No</td> </tr> - <tr> - <!-- from Albuquerque 2017 --> - <td><a href="https://wg21.link/p0588r1";>P0588R1</a> (<a href="#dr">DR</a>)</td> - <td class="none" align="center">No</td> - </tr> <tr> - <td>Declared type of an expression</td> - <td><a href="https://wg21.link/n2343";>N2343</a></td> - <td class="full" align="center">Clang 2.9</td> + <td rowspan=2>Change scope of lambda trailing-return-type</td> + <td><a href="https://wg21.link/P2036R3";>P2036R3</a></td> + <td rowspan=2 class="unreleased" align="center">Clang 17</td> </tr> <tr> - <td> Incomplete return types</td> - <td><a href="https://wg21.link/n3276";>N3276</a></td> - <td class="full" align="center">Clang 3.1</td> + <td><a href="https://wg21.link/P2579R0";>P2579R0</a></td> </tr> <tr> - <td>Right angle brackets</td> - <td><a href="https://wg21.link/n1757";>N1757</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Multidimensional subscript operator</td> + <td><a href="https://wg21.link/P2128R6";>P2128R6</a></td> + <td class="full" align="center">Clang 15</td> </tr> <tr> - <td>Default template arguments for function templates</td> - <td><a href="https://wg21.link/cwg226";>DR226</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Non-literal variables (and labels and gotos) in constexpr functions</td> + <td><a href="https://wg21.link/P2242R3";>P2242R3</a></td> + <td class="full" align="center">Clang 15</td> </tr> <tr> - <td>Solving the SFINAE problem for expressions</td> - <td><a href="https://wg21.link/n2634";>DR339</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Character encoding of diagnostic text</td> + <td><a href="https://wg21.link/P2246R1";>P2246R1</a></td> + <td class="full" align="center">Yes</td> </tr> <tr> - <td>Alias templates</td> - <td><a href="https://wg21.link/n2258";>N2258</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>Character sets and encodings</td> + <td><a href="https://wg21.link/P2314R4";>P2314R4</a></td> + <td class="full" align="center">Yes</td> </tr> <tr> - <td>Extern templates</td> - <td><a href="https://wg21.link/n1987";>N1987</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Consistent character literal encoding</td> + <td><a href="https://wg21.link/P2316R2";>P2316R2</a></td> + <td class="full" align="center">Yes</td> </tr> <tr> - <td>Null pointer constant</td> - <td><a href="https://wg21.link/n2431";>N2431</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>Add support for preprocessing directives elifdef and elifndef</td> + <td><a href="https://wg21.link/P2334R1";>P2334R1</a></td> + <td class="full" align="center">Clang 13</td> </tr> <tr> - <td>Strongly-typed enums</td> - <td><a href="https://wg21.link/n2347";>N2347</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Extend init-statement to allow alias-declaration</td> + <td><a href="https://wg21.link/P2360R0";>P2360R0</a></td> + <td class="full" align="center">Clang 14</td> </tr> <tr> - <td>Forward declarations for enums</td> - <td><a href="https://wg21.link/n2764";>N2764</a> - <br><a href="https://wg21.link/cwg1206";>DR1206</a></td> - <td class="full" align="center">Clang 3.1</td> + <td>auto(x): decay-copy in the language</td> + <td><a href="https://wg21.link/P0849R8";>P0849R8</a></td> + <td class="full" align="center">Clang 15</td> </tr> + <!-- February 2022 papers --> <tr> - <td>Standardized attribute syntax</td> - <td><a href="https://wg21.link/n2761";>N2761</a></td> - <td class="full" align="center">Clang 3.3 <a href="#n2761">(1)</a></td> + <td>Attributes on Lambda-Expressions</td> + <td><a href="https://wg21.link/P2173R1";>P2173R1</a></td> + <td class="full" align="center">Clang 13</td> </tr> <tr> - <td rowspan="2">Generalized constant expressions</td> - <td><a href="https://wg21.link/n2235";>N2235</a></td> - <td class="full" align="center">Clang 3.1</td> + <td><tt>constexpr</tt> for <tt><cmath></tt> and <tt><cstdlib></tt></td> + <td><a href="https://wg21.link/P0533R9";>P0533R9</a></td> + <td class="none" align="center">No</td> </tr> - <tr> - <!-- from Albuquerque 2017 --> - <td><a href="https://wg21.link/p0859r0";>P0859R0</a> (<a href="#dr">DR</a>)</td> - <td class="full" align="center">Clang 8</td> - </tr> <tr> - <td>Alignment support</td> - <td><a href="https://wg21.link/n2341";>N2341</a></td> - <td class="full" align="center">Clang 3.3</td> + <td>Type trait to determine if a reference binds to a temporary</td> + <td><a href="https://wg21.link/P2255R2";>P2255R2</a></td> + <td class="partial" align="center"> + <details><summary>Partial</summary> + Clang provides a <tt>__reference_binds_to_temporary</tt> type trait + builtin, with which the library facility can be partially implemented. + Both <tt>__reference_constructs_from_temporary</tt> and + <tt>__reference_converts_from_temporary</tt> builtins should be + provided, following the normal cross-vendor convention to implement + traits requiring compiler support directly. + </details></td> + </td> </tr> + <!-- July 2022 papers --> <tr> - <td>Conditionally-support behavior</td> - <td><a href="https://wg21.link/n1627";>N1627</a></td> - <td class="full" align="center">Clang 2.9</td> - </tr> - <tr> - <td>Changing undefined behavior into diagnosable errors</td> - <td><a href="https://wg21.link/n1727";>N1727</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>The Equality Operator You Are Looking For</td> + <td><a href="https://wg21.link/P2468R2";>P2468R2</a></td> + <td class="full" align="center">Clang 16</td> </tr> <tr> - <td>Delegating constructors</td> - <td><a href="https://wg21.link/n1986";>N1986</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>De-deprecating volatile compound operations</td> + <td><a href="https://wg21.link/P2327R1";>P2327R1</a></td> + <td class="full" align="center">Clang 15</td> </tr> <tr> - <td rowspan="2">Inheriting constructors</td> - <td><a href="https://wg21.link/n2540";>N2540</a></td> - <td class="full" align="center">Clang 3.3</td> + <td>Support for <code>#warning</code></td> + <td><a href="https://wg21.link/P2437R1";>P2437R1</a></td> + <td class="full" align="center">Yes</td> </tr> - <tr> - <!-- from Kona 2015 --> - <td><a href="https://wg21.link/p0136r1";>P0136R1</a> (<a href="#dr">DR</a>)</td> - <td class="full" align="center">Clang 3.9</td> - </tr> <tr> - <td>Explicit conversion operators</td> - <td><a href="https://wg21.link/n2437";>N2437</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>Remove non-encodable wide character literals and multicharacter wide character literals</td> + <td><a href="https://wg21.link/P2362R3";>P2362R3</a></td> + <td class="full" align="center">Clang 14</td> </tr> <tr> - <td>New character types</td> - <td><a href="https://wg21.link/n2249";>N2249</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Labels at the end of compound statements</td> + <td><a href="https://wg21.link/P2324R2";>P2324R2</a></td> + <td class="full" align="center">Clang 16</td> </tr> <tr> - <td>Unicode string literals</td> - <td><a href="https://wg21.link/n2442";>N2442</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>Delimited escape sequences</td> + <td><a href="https://wg21.link/P2290R3";>P2290R3</a></td> + <td class="full" align="center">Clang 15</td> </tr> <tr> - <td>Raw string literals</td> - <td><a href="https://wg21.link/n2442";>N2442</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>Named universal character escapes</td> + <td><a href="https://wg21.link/P2071R2";>P2071R2</a></td> + <td class="full" align="center">Clang 15</td> </tr> <tr> - <td>Universal character names in literals</td> - <td><a href="https://wg21.link/n2170";>N2170</a></td> - <td class="full" align="center">Clang 3.1</td> + <td>Relaxing some constexpr restrictions</td> + <td><a href="https://wg21.link/P2448R2";>P2448R2</a></td> + <td class="partial" align="center"> + <details><summary>Clang 17 (Partial)</summary> + We do not support outside of defaulted special memeber functions the change that constexpr functions no + longer have to be constexpr compatible but rather support a less restricted requirements for constexpr + functions. Which include allowing non-literal types as return values and parameters, allow calling of + non-constexpr functions and constructors. + </details></td> + </td> </tr> <tr> - <td>User-defined literals</td> - <td><a href="https://wg21.link/n2765";>N2765</a></td> - <td class="full" align="center">Clang 3.1</td> + <td>Using unknown pointers and references in constant expressions</td> + <td><a href="https://wg21.link/P2280R4";>P2280R4</a></td> + <td class="none" align="center">No</td> </tr> <tr> - <td>Standard Layout Types</td> - <td><a href="https://wg21.link/n2342";>N2342</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>static <code>operator()</code></td> + <td><a href="https://wg21.link/P1169R4";>P1169R4</a></td> + <td class="full" align="center">Clang 16</td> </tr> <tr> - <td rowspan="2">Defaulted functions</td> - <td><a href="https://wg21.link/n2346";>N2346</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>Extended floating-point types and standard names</td> + <td><a href="https://wg21.link/P1467R9";>P1467R9</a></td> + <td class="none" align="center">No</td> </tr> - <tr> <!-- from Kona 2019--> - <td><a href="https://wg21.link/p1286r2";>P1286R2</a> (<a href="#dr">DR</a>)</td> - <td class="full" align="center">Clang 9</td> - </tr> <tr> - <td>Deleted functions</td> - <td><a href="https://wg21.link/n2346";>N2346</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Class template argument deduction from inherited constructors</td> + <td><a href="https://wg21.link/P2582R1";>P2582R1</a></td> + <td class="none" align="center">No</td> </tr> <tr> - <td>Extended friend declarations</td> - <td><a href="https://wg21.link/n1791";>N1791</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Portable assumptions</td> + <td><a href="https://wg21.link/P1774R8";>P1774R8</a></td> + <td class="none" align="center">No</td> </tr> <tr> - <td>Extending <code>sizeof</code></td> - <td><a href="https://wg21.link/n2253";>N2253</a> - <br><a href="https://wg21.link/cwg850";>DR850</a></td> - <td class="full" align="center">Clang 3.1</td> + <td>Support for UTF-8 as a portable source file encoding</td> + <td><a href="https://wg21.link/P2295R6";>P2295R6</a></td> + <td class="full" align="center">Clang 15</td> </tr> <tr> - <td>Inline namespaces</td> - <td><a href="https://wg21.link/n2535";>N2535</a></td> - <td class="full" align="center">Clang 2.9</td> + <td><code>char8_t</code> Compatibility and Portability Fix</td> + <td><a href="https://wg21.link/P2513R3";>P2513R3</a></td> + <td class="full" align="center">Clang 16</td> </tr> <tr> - <td>Unrestricted unions</td> - <td><a href="https://wg21.link/n2544";>N2544</a></td> - <td class="full" align="center">Clang 3.1</td> + <td>Relax requirements on <code>wchar_t</code> to match existing practices</td> + <td><a href="https://wg21.link/P2460R2";>P2460R2</a></td> + <td class="full" align="center">Yes</td> </tr> <tr> - <td>Local and unnamed types as template arguments</td> - <td><a href="https://wg21.link/n2657";>N2657</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Explicit lifetime management</td> + <td><a href="https://wg21.link/P2590R2";>P2590R2</a></td> + <td class="none" align="center">No</td> </tr> + <!-- November 2022 (Kona) papers --> <tr> - <td rowspan="2">Range-based for</td> - <td><a href="https://wg21.link/n2930";>N2930</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>static <code>operator[]</code></td> + <td><a href="https://wg21.link/P2589R1";>P2589R1</a></td> + <td class="full" align="center">Clang 16</td> </tr> - <tr> - <!-- from Jacksonville 2018 --> - <td><a href="https://wg21.link/p0962r1";>P0962R1</a> (<a href="#dr">DR</a>)</td> - <td class="full" align="center">Clang 8</td> - </tr> <tr> - <td>Explicit virtual overrides</td> - <td><a href="https://wg21.link/n2928";>N2928</a> - <br><a href="https://wg21.link/n3206";>N3206</a> - <br><a href="https://wg21.link/n3272";>N3272</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>Permitting static constexpr variables in constexpr functions</td> + <td><a href="https://wg21.link/P2647R1";>P2647R1</a></td> + <td class="full" align="center">Clang 16</td> </tr> <tr> - <td>Minimal support for garbage collection and reachability-based leak detection</td> - <td><a href="https://wg21.link/n2670";>N2670</a></td> - <td class="na" align="center">N/A <a href="#n2670">(2)</a></td> + <td>consteval needs to propagate up</td> + <td><a href="https://wg21.link/P2564R3";>P2564R3</a> (<a href="#dr">DR</a>)</td> + <td class="none" align="center">No</td> </tr> <tr> - <td>Allowing move constructors to throw [noexcept]</td> - <td><a href="https://wg21.link/n3050";>N3050</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>Lifetime extension in range-based for loops</td> + <td><a href="https://wg21.link/P2718R0";>P2718R0</a></td> + <td class="none" align="center">No</td> </tr> + <!--Issaquah 2023 papers--> <tr> - <td>Defining move special member functions</td> - <td><a href="https://wg21.link/n3053";>N3053</a></td> - <td class="full" align="center">Clang 3.0</td> + <td>Referencing The Unicode Standard</td> + <td><a href="https://wg21.link/P2736R2";>P2736R2</a></td> + <td class="full" align="center">Yes</td> </tr> +</table> +</details> - <tr class="separator"> - <th align="center" colspan="3">Concurrency</th> - </tr> - <tr> - <td>Sequence points</td> - <td><a href="https://wg21.link/n2239";>N2239</a></td> - <td class="full" align="center">Clang 3.3</td> - </tr> - <tr> - <td>Atomic operations</td> - <td><a href="https://wg21.link/n2427";>N2427</a></td> - <td class="full" align="center">Clang 3.1</td> - </tr> - <tr> - <td>Strong Compare and Exchange</td> - <td><a href="https://wg21.link/n2748";>N2748</a></td> - <td class="full" align="center">Clang 3.1 <a href="#n2748">(3)</a></td> - </tr> - <tr> - <td>Bidirectional Fences</td> - <td><a href="https://wg21.link/n2752";>N2752</a></td> - <td class="full" align="center">Clang 3.1</td> - </tr> +<h2 id="cxx20">C++20 implementation status</h2> + +<p>Clang has support for some of the features of the +<a href="https://www.iso.org/standard/79358.html";>ISO C++ 2020 standard</a>.</p> + +<p>You can use Clang in C++20 mode with the <code>-std=c++20</code> option +(use <code>-std=c++2a</code> in Clang 9 and earlier).</p> + +<details open> +<summary>List of features and minimum Clang version with support</summary> + +<table width="689" border="1" cellspacing="0"> + <tr> + <th>Language Feature</th> + <th>C++20 Proposal</th> + <th>Available in Clang?</th> + </tr> + <!-- Toronto 2017 papers --> <tr> - <td>Memory model</td> - <td><a href="https://wg21.link/n2429";>N2429</a></td> - <td class="full" align="center">Clang 3.2</td> + <td>Default member initializers for bit-fields</td> + <td><a href="https://wg21.link/p0683r1";>P0683R1</a></td> + <td class="full" align="center">Clang 6</td> </tr> <tr> - <td>Data-dependency ordering: atomics and memory model</td> - <td><a href="https://wg21.link/n2664";>N2664</a></td> - <td class="full" align="center">Clang 3.2 <a href="#n2664">(4)</a></td> + <td><tt>const&</tt>-qualified pointers to members</td> + <td><a href="https://wg21.link/p0704r1";>P0704R1</a></td> + <td class="full" align="center">Clang 6</td> </tr> <tr> - <td>Propagating exceptions</td> - <td><a href="https://wg21.link/n2179";>N2179</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Allow <i>lambda-capture</i> <tt>[=, this]</tt></td> + <td><a href="https://wg21.link/p0409r2";>P0409R2</a></td> + <td class="full" align="center">Clang 6</td> </tr> <tr> - <td>Allow atomics use in signal handlers</td> - <td><a href="https://wg21.link/n2547";>N2547</a></td> - <td class="full" align="center">Clang 3.1</td> + <td rowspan="2"><tt>__VA_OPT__</tt> for preprocessor comma elision</td> + <td><a href="https://wg21.link/p0306r4";>P0306R4</a></td> + <td class="full" align="center">Clang 6</td> </tr> + <tr> <!-- from Rapperswil --> + <td><a href="https://wg21.link/p1042r1";>P1042R1</a></td> + <td class="full" align="center">Clang 9</td> + </tr> <tr> - <td>Thread-local storage</td> - <td><a href="https://wg21.link/n2659";>N2659</a></td> - <td class="full" align="center">Clang 3.3 <a href="#n2659">(5)</a></td> + <td>Designated initializers</td> + <td><a href="https://wg21.link/p0329r4";>P0329R4</a></td> + <td class="full" align="center">Clang 10</td> </tr> <tr> - <td>Dynamic initialization and destruction with concurrency</td> - <td><a href="https://wg21.link/n2660";>N2660</a></td> - <td class="full" align="center">Clang 2.9</td> - </tr> - - <tr class="separator"> - <th align="center" colspan="3">C99 Features in C++11</th> + <td><i>template-parameter-list</i> for generic lambdas</td> + <td><a href="https://wg21.link/p0428r2";>P0428R2</a></td> + <td class="full" align="center">Clang 9</td> </tr> - <tr> - <td><code>__func__</code> predefined identifier</td> - <td><a href="https://wg21.link/n2340";>N2340</a></td> - <td class="full" align="center">Clang 2.9</td> + <tr id="p0734"> + <td rowspan="13">Concepts</td> + <td><a href="https://wg21.link/p0734r0";>P0734R0</a></td> + <td class="full" align="center">Clang 10</td> </tr> + <tr> <!-- from Albuquerque --> + <td><a href="https://wg21.link/p0857r0";>P0857R0</a></td> + <td rowspan="1" class="full" align="center">Clang 16</td> + </tr> + <tr> <!-- from San Diego --> + <td><a href="https://wg21.link/p1084r2";>P1084R2</a></td> + <td rowspan="2" class="full" align="center">Clang 10</td> + </tr> + <tr> + <td><a href="https://wg21.link/p1141r2";>P1141R2</a></td> + </tr> + <tr> <!-- from Cologne --> + <td><a href="https://wg21.link/p0848r3";>P0848R3</a></td> + <td rowspan="1" class="partial" align="center"> + <details> + <summary>Clang 16 (Partial)</summary> + Because of other concepts implementation deficits, the __cpp_concepts macro is not yet set to 202002L. + Also, the related defect reports <a href="https://wg21.link/cwg1496";>DR1496</a> and + <a href="https://wg21.link/cwg1734";>DR1734</a> are not yet implemented. Accordingly, deleted + special member functions are treated as eligible even though they shouldn't be. + </details> + </td> + </tr> + <tr> + <td><a href="https://wg21.link/p1616r1";>P1616R1</a></td> + <td rowspan="2" class="full" align="center">Clang 10</td> + </tr> + <tr> + <td><a href="https://wg21.link/p1452r2";>P1452R2</a></td> + </tr> + <tr> <!-- from Belfast --> + <td><a href="https://wg21.link/p1972r0";>P1972R0</a></td> + <td rowspan="4" class="full" align="center">Clang 10</td> + </tr> + <tr> + <td><a href="https://wg21.link/p1980r0";>P1980R0</a></td> + </tr> + <tr> <!-- from Prague --> + <td><a href="https://wg21.link/p2103r0";>P2103R0</a></td> + </tr> + <tr> <!-- from February 2022 --> + <td><a href="https://wg21.link/p2493r0";>P2493R0</a></td> + </tr> + <tr> + <td><a href="https://wg21.link/p2092r0";>P2092R0</a></td> + <td rowspan="1" class="full" align="center">Clang 16</td> + </tr> + <tr> + <td><a href="https://wg21.link/p2113r0";>P2113R0</a></td> + <td rowspan="1" class="full" align="center">Clang 16</td> + </tr> + <!-- Albuquerque papers --> <tr> - <td>C99 preprocessor</td> - <td><a href="https://wg21.link/n1653";>N1653</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Range-based for statements with initializer</td> + <td><a href="https://wg21.link/p0614r1";>P0614R1</a></td> + <td class="full" align="center">Clang 8</td> </tr> <tr> - <td><code>long long</code></td> - <td><a href="https://wg21.link/n1811";>N1811</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>ADL and function templates that are not visible</td> + <td><a href="https://wg21.link/p0846r0";>P0846R0</a></td> + <td class="full" align="center">Clang 9</td> </tr> <tr> - <td>Extended integral types</td> - <td><a href="https://wg21.link/n1988";>N1988</a></td> - <td class="na" align="center">N/A <a href="#n1988">(6)</a></td> + <td><tt>const</tt> mismatch with defaulted copy constructor</td> + <td><a href="https://wg21.link/p0641r2";>P0641R2</a></td> + <td class="full" align="center">Clang 8</td> </tr> -</table> - -<p> -<span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute -has no effect.</span><br> -<span id="n2670">(2): No compiler changes are required for an implementation -such as Clang that does not provide garbage collection.</span><br> -<span id="n2748">(3): All compare-exchange operations are emitted as -strong compare-exchanges.</span><br> -<span id="n2664">(4): <code>memory_order_consume</code> is lowered to -<code>memory_order_acquire</code>.</span><br> -<span id="n2659">(5): <code>thread_local</code> support -requires a C++ runtime library providing <code>__cxa_thread_atexit</code>, such -as <a href="https://libcxxabi.llvm.org";>libc++abi</a> 3.6 or later, -or libsupc++ 4.8 or later.</span><br> -<span id="n1988">(6): No compiler changes are required for an implementation -such as Clang that does not provide any extended integer types. -<code>__int128</code> is not treated as an extended integer type, -because changing <code>intmax_t</code> would be an ABI-incompatible -change.</span> -</p> -</details> - -<h2 id="cxx14">C++14 implementation status</h2> - -<p>Clang 3.4 and later implement all of the <a - href="https://www.iso.org/standard/64029.html";>ISO - C++ 2014 standard</a>.</p> - -<p>You can use Clang in C++14 mode with the <code>-std=c++14</code> option -(use <code>-std=c++1y</code> in Clang 3.4 and earlier).</p> - -<details> -<summary>List of features and minimum Clang version with support</summary> - -<table width="689" border="1" cellspacing="0"> - <tr> - <th>Language Feature</th> - <th>C++14 Proposal</th> - <th>Available in Clang?</th> - </tr> <tr> - <td>Tweak to certain C++ contextual conversions</td> - <td><a href="https://wg21.link/n3323";>N3323</a></td> - <td class="full" align="center">Clang 3.4</td> + <td rowspan="10">Consistent comparison (<tt>operator<=></tt>)</td> + <td><a href="https://wg21.link/p0515r3";>P0515R3</a></td> + <td rowspan="8" class="full" align="center">Clang 10</td> </tr> + <tr> <!-- from Jacksonville --> + <td><a href="https://wg21.link/p0905r1";>P0905R1</a></td> + </tr> + <tr> <!-- from Rapperswil --> + <td><a href="https://wg21.link/p1120r0";>P1120R0</a></td> + </tr> + <tr> <!-- from Kona 2019 --> + <td><a href="https://wg21.link/p1185r2";>P1185R2</a></td> + </tr> + <tr> <!-- from Cologne --> + <td><a href="https://wg21.link/p1186r3";>P1186R3</a></td> + </tr> + <tr> + <td><a href="https://wg21.link/p1630r1";>P1630R1</a></td> + </tr> + <tr> <!-- from Belfast --> + <td><a href="https://wg21.link/p1946r0";>P1946R0</a></td> + </tr> + <tr> + <td><a href="https://wg21.link/p1959r0";>P1959R0</a></td> + </tr> + <tr> <!-- from Prague --> + <td><a href="https://wg21.link/p2002r1";>P2002R1</a></td> + <td class="partial" align="center">Partial</td> + </tr> + <tr> + <td><a href="https://wg21.link/p2085r0";>P2085R0</a></td> + <td class="full" align="center">Clang 14</td> + </tr> <tr> - <td>Binary literals</td> - <td><a href="https://wg21.link/n3472";>N3472</a></td> - <td class="full" align="center">Clang 2.9</td> + <td>Access checking on specializations</td> + <td><a href="https://wg21.link/p0692r1";>P0692R1</a></td> + <td class="full" align="center">Clang 14</td> </tr> <tr> - <td>decltype(auto)</td> - <td rowspan=2 style="vertical-align:middle"><a href="https://wg21.link/n3638";>N3638</a></td> - <td class="full" align="center">Clang 3.3</td> + <td>Default constructible and assignable stateless lambdas</td> + <td><a href="https://wg21.link/p0624r2";>P0624R2</a></td> + <td class="full" align="center">Clang 8</td> </tr> <tr> - <td>Return type deduction for normal functions</td> - <td class="full" align="center">Clang 3.4</td> + <td>Lambdas in unevaluated contexts</td> + <td><a href="https://wg21.link/p0315r4";>P0315R4</a></td> + <td class="full" align="center">Clang 17</td> </tr> + <!-- Jacksonville papers --> <tr> - <td>Initialized lambda captures</td> - <td><a href="https://wg21.link/n3648";>N3648</a></td> - <td class="full" align="center">Clang 3.4</td> + <td><tt>[[no_unique_address]]</tt> attribute</td> + <td><a href="https://wg21.link/p0840r2";>P0840R2</a></td> + <td class="full" align="center">Clang 9</td> </tr> <tr> - <td>Generic lambdas</td> - <td><a href="https://wg21.link/n3649";>N3649</a></td> - <td class="full" align="center">Clang 3.4</td> + <td><tt>[[likely]]</tt> and <tt>[[unlikely]]</tt> attributes</td> + <td><a href="https://wg21.link/p0479r5";>P0479R5</a></td> + <td class="full" align="center">Clang 12</td> </tr> <tr> - <td>Variable templates</td> - <td><a href="https://wg21.link/n3651";>N3651</a></td> - <td class="full" align="center">Clang 3.4</td> + <td><tt>typename</tt> optional in more contexts</td> + <td><a href="https://wg21.link/p0634r3";>P0634R3</a></td> + <td class="full" align="center">Clang 16</td> </tr> <tr> - <td>Relaxing requirements on constexpr functions</td> - <td><a href="https://wg21.link/n3652";>N3652</a></td> - <td class="full" align="center">Clang 3.4</td> + <td>Pack expansion in lambda <i>init-capture</i></td> + <td><a href="https://wg21.link/p0780r2";>P0780R2</a></td> + <td class="full" align="center">Clang 9</td> </tr> + <!-- Rapperswil papers --> <tr> - <td>Member initializers and aggregates</td> - <td><a href="https://wg21.link/n3653";>N3653</a></td> - <td class="full" align="center">Clang 3.3</td> + <td rowspan="2">Class types as non-type template parameters</td> + <td><a href="https://wg21.link/p0732r2";>P0732R2</a></td> + <td rowspan="2" class="partial" align="center">Partial</td> </tr> + <tr> <!-- from Belfast --> + <td><a href="https://wg21.link/p1907r1";>P1907R1</a></td> + </tr> <tr> - <td>Clarifying memory allocation</td> - <td><a href="https://wg21.link/n3664";>N3664</a></td> - <td class="full" align="center">Clang 3.4</td> + <td>Destroying operator delete</td> + <td><a href="https://wg21.link/p0722r3";>P0722R3</a></td> + <td class="full" align="center">Clang 6</td> </tr> <tr> - <td><tt>[[deprecated]]</tt> attribute</td> - <td><a href="https://wg21.link/n3760";>N3760</a></td> - <td class="full" align="center">Clang 3.4</td> + <td rowspan="7">Relaxations of <tt>constexpr</tt> restrictions</td> + <td><a href="https://wg21.link/p1064r0";>P1064R0</a></td> + <td class="full" align="center">Clang 9</td> </tr> + <tr> <!-- from San Diego --> + <td><a href="https://wg21.link/p1002r1";>P1002R1</a></td> + <td class="full" align="center">Clang 8</td> + </tr> + <tr> + <td><a href="https://wg21.link/p1327r1";>P1327R1</a></td> + <td rowspan="2" class="full" align="center">Clang 9</td> + </tr> + <tr> + <td><a href="https://wg21.link/p1330r0";>P1330R0</a></td> + </tr> + <tr> <!-- from Cologne --> + <td><a href="https://wg21.link/p1331r2";>P1331R2</a></td> + <td rowspan="3" class="full" align="center">Clang 10</td> + </tr> + <tr> + <td><a href="https://wg21.link/p1668r1";>P1668R1</a></td> + </tr> + <tr> + <td><a href="https://wg21.link/p0784r7";>P0784R7</a></td> + </tr> <tr> - <td>Single quotation mark as digit separator</td> - <td><a href="https://wg21.link/n3781";>N3781</a></td> - <td class="full" align="center">Clang 3.4</td> + <td>Prohibit aggregates with user-declared constructors</td> + <td><a href="https://wg21.link/p1008r1";>P1008R1</a></td> + <td class="full" align="center">Clang 8</td> </tr> <tr> - <td>C++ Sized Deallocation</td> - <td><a href="https://wg21.link/n3778";>N3778</a></td> - <td class="full" align="center">Clang 3.4 <a href="#n3778">(7)</a></td> + <td>Feature test macros</td> + <td><a href="https://wg21.link/p0941r2";>P0941R2</a></td> + <td class="full" align="center"><a href="#sd6">(see below)</a></td> </tr> -</table> - -<p> -<span id="n3778">(7): In Clang 3.7 and later, sized deallocation is only enabled -if the user passes the <code>-fsized-deallocation</code> flag. The user must -supply definitions of the sized deallocation functions, either by providing them -explicitly or by using a C++ standard library that does. <code>libstdc++</code> -added these functions in version 5.0, and <code>libc++</code> added them in -version 3.7. -</span> -</p> -</details> - + <tr> + <td><tt>explicit(bool)</tt></td> + <td><a href="https://wg21.link/p0892r2";>P0892R2</a></td> + <td class="full" align="center">Clang 9</td> + </tr> + <!-- San Diego papers --> + <tr> + <td>Signed integers are two's complement</td> + <td><a href="https://wg21.link/p1236r1";>P1236R1</a></td> + <td class="full" align="center">Clang 9</td> + </tr> + <tr> + <td><tt>char8_t</tt></td> + <td><a href="https://wg21.link/p0482r6";>P0482R6</a></td> + <td class="full" align="center">Clang 7 <a href="#p0482">(11)</a></td> + </tr> + <tr> + <td rowspan=2>Immediate functions (<tt>consteval</tt>)</td> + <td><a href="https://wg21.link/p1073r3";>P1073R3</a></td> + <td class="partial" align="center"> + <details><summary>Clang 15 (Partial)</summary> + Clang still incorrectly defers some consteval executions to runtime, + resulting in CodeGen crashes. Additionally, Clang does not properly + handle default arguments in consteval functions under all + circumstances. + </details> + </td> + </tr> + <tr> <!-- from Prague --> + <td><a href="https://wg21.link/p1937r2";>P1937R2</a></td> + <td class="full" align="center">Clang 14</td> + </tr> + <tr> + <td><tt>std::is_constant_evaluated</tt></td> + <td><a href="https://wg21.link/p0595r2";>P0595R2</a></td> + <td class="full" align="center">Clang 9</td> + </tr> + <tr> + <td>Nested inline namespaces</td> + <td><a href="https://wg21.link/p1094r2";>P1094R2</a></td> + <td class="full" align="center">Clang 8</td> + </tr> + <!-- Kona 2019 papers --> + <tr> + <td rowspan="2">Structured binding extensions</td> + <td><a href="https://wg21.link/p1091r3";>P1091R3</a></td> + <td rowspan="2" class="full" align="center">Clang 16</td> + </tr> + <tr> + <td><a href="https://wg21.link/p1381r1";>P1381R1</a></td> + </tr> + <tr> + <td rowspan="2">Stronger Unicode requirements</td> + <td><a href="https://wg21.link/p1041r4";>P1041R4</a></td> + <td rowspan="2" class="full" align="center">Yes</td> + </tr> + <tr> + <td><a href="https://wg21.link/p1139r2";>P1139R2</a></td> + </tr> + <tr> + <td rowspan="2">Parenthesized initialization of aggregates</td> + <td><a href="https://wg21.link/p0960r3";>P0960R3</a></td> + <td rowspan="2" class="none" align="center">No</td> + </tr> + <tr> <!-- from Belfast --> + <td><a href="https://wg21.link/p1975r0";>P1975R0</a></td> + </tr> + <tr> + <td rowspan="12">Modules</td> + <td><a href="https://wg21.link/p1103r3";>P1103R3</a></td> + <td class="full" align="center">Clang 15</td> + </tr> + <tr> <!-- from Cologne --> + <td><a href="https://wg21.link/p1766r1";>P1766R1</a> (<a href="#dr">DR</a>)</td> + <td class="full" align="center">Clang 11</td> + </tr> + <tr> + <td><a href="https://wg21.link/p1811r0";>P1811R0</a></td> + <td class="none" align="center">No</td> + </tr> + <tr> + <td><a href="https://wg21.link/p1703r1";>P1703R1</a></td> + <td class="none" align="center">Subsumed by P1857</td> + </tr> + <tr> <!-- from Belfast --> + <td><a href="https://wg21.link/p1874r1";>P1874R1</a></td> + <td class="full" align="center">Clang 15</td> + </tr> + <tr> <!-- from Belfast --> + <td><a href="https://wg21.link/p1979r0";>P1979R0</a></td> + <td class="none" align="center">No</td> + </tr> + <tr> <!-- from Prague --> + <td><a href="https://wg21.link/p1779r3";>P1779R3</a></td> + <td class="full" align="center">Clang 15</td> + </tr> + <tr> + <td><a href="https://wg21.link/p1857r3";>P1857R3</a></td> + <td class="none" align="center">No</td> + </tr> + <tr> + <td><a href="https://wg21.link/p2115r0";>P2115R0</a></td> + <td class="partial" align="center">Partial</td> + </tr> + <tr> + <td><a href="https://wg21.link/p1815r2";>P1815R2</a></td> + <td class="partial" align="center">Partial</td> + </tr> + <tr> <!-- from Kona 2022 --> + <td><a href="https://wg21.link/P2615R1";>P2615R1</a> (<a href="#dr">DR</a>)</td> + <td class="none" align="center">No</td> + </tr> + <tr> <!-- from Issaquah 2023 --> + <td><a href="https://wg21.link/P2788R0";>P2788R0</a> (<a href="#dr">DR</a>)</td> + <td class="none" align="center">No</td> + </tr> + <tr> + <td>Coroutines</td> + <td><a href="https://wg21.link/p0912r5";>P0912R5</a></td> + <td class="partial" align="center"> + <details><summary>Partial</summary> + Fully supported on all targets except Windows, which + still has some stability and ABI issues. + </details></td> + </tr> + <!-- Cologne 2019 papers --> + <tr> + <td>Deprecate <tt>a[b,c]</tt></td> + <td><a href="https://wg21.link/p1161r3";>P1161R3</a></td> + <td class="full" align="center">Clang 9</td> + </tr> + <tr> + <td>Deprecate some problematic uses of <tt>volatile</tt></td> + <td><a href="https://wg21.link/p1152r4";>P1152R4</a></td> + <td class="full" align="center">Clang 10</td> + </tr> + <tr> + <td><tt>[[nodiscard("with reason")]]</tt></td> + <td><a href="https://wg21.link/p1301r4";>P1301R4</a></td> + <td class="full" align="center">Clang 9</td> + </tr> + <tr> + <td><tt>using enum</tt></td> + <td><a href="https://wg21.link/p1099r5";>P1099R5</a></td> + <td class="full" align="center">Clang 13</td> + </tr> + <tr> + <td rowspan=2>Class template argument deduction for aggregates</td> + <td><a href="https://wg21.link/p1816r0";>P1816R0</a></td> + <td rowspan=2 class="none" align="center">No</td> + </tr> + <tr> <!-- from Prague --> + <td><a href="https://wg21.link/p2082r1";>P2082R1</a></td> + </tr> + <tr> + <td>Class template argument deduction for alias templates</td> + <td><a href="https://wg21.link/p1814r0";>P1814R0</a></td> + <td class="none" align="center">No</td> + </tr> + <tr> + <td>Permit conversions to arrays of unknown bound</td> + <td><a href="https://wg21.link/p0388r4";>P0388R4</a></td> + <td class="full" align="center">Clang 14</td> + </tr> + <tr> + <td><tt>constinit</tt></td> + <td><a href="https://wg21.link/p1143r2";>P1143R2</a></td> + <td class="full" align="center">Clang 10</td> + </tr> + <!-- Prague 2019 papers --> + <tr> + <td>Pseudo-destructors end object lifetimes</td> + <td><a href="https://wg21.link/p0593r6";>P0593R6</a> (<a href="#dr">DR</a>)</td> + <td class="full" align="center">Clang 11</td> + </tr> + <tr> + <td>More implicit moves</td> + <td><a href="https://wg21.link/p1825r0";>P1825R0</a> (<a href="#dr">DR</a>)</td> + <td class="full" align="center">Clang 13</td> + </tr> +</table> + +<p> +<span id="p0482">(11): Prior to Clang 8, this feature is not enabled by +<tt>-std=c++20</tt>, but can be enabled with <tt>-fchar8_t</tt>. +</span> +</p> +</details> + + <h2 id="cxx17">C++17 implementation status</h2> <p>Clang 5 and later implement all the features of the @@ -858,731 +1080,513 @@ <h2 id="cxx17">C++17 implementation status</h2> </p> </details> -<h2 id="cxx20">C++20 implementation status</h2> +<h2 id="cxx14">C++14 implementation status</h2> -<p>Clang has support for some of the features of the -<a href="https://www.iso.org/standard/79358.html";>ISO C++ 2020 standard</a>.</p> +<p>Clang 3.4 and later implement all of the <a + href="https://www.iso.org/standard/64029.html";>ISO + C++ 2014 standard</a>.</p> -<p>You can use Clang in C++20 mode with the <code>-std=c++20</code> option -(use <code>-std=c++2a</code> in Clang 9 and earlier).</p> +<p>You can use Clang in C++14 mode with the <code>-std=c++14</code> option +(use <code>-std=c++1y</code> in Clang 3.4 and earlier).</p> -<details open> +<details> <summary>List of features and minimum Clang version with support</summary> <table width="689" border="1" cellspacing="0"> <tr> <th>Language Feature</th> - <th>C++20 Proposal</th> + <th>C++14 Proposal</th> <th>Available in Clang?</th> </tr> - <!-- Toronto 2017 papers --> <tr> - <td>Default member initializers for bit-fields</td> - <td><a href="https://wg21.link/p0683r1";>P0683R1</a></td> - <td class="full" align="center">Clang 6</td> + <td>Tweak to certain C++ contextual conversions</td> + <td><a href="https://wg21.link/n3323";>N3323</a></td> + <td class="full" align="center">Clang 3.4</td> </tr> <tr> - <td><tt>const&</tt>-qualified pointers to members</td> - <td><a href="https://wg21.link/p0704r1";>P0704R1</a></td> - <td class="full" align="center">Clang 6</td> + <td>Binary literals</td> + <td><a href="https://wg21.link/n3472";>N3472</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>Allow <i>lambda-capture</i> <tt>[=, this]</tt></td> - <td><a href="https://wg21.link/p0409r2";>P0409R2</a></td> - <td class="full" align="center">Clang 6</td> + <td>decltype(auto)</td> + <td rowspan=2 style="vertical-align:middle"><a href="https://wg21.link/n3638";>N3638</a></td> + <td class="full" align="center">Clang 3.3</td> </tr> <tr> - <td rowspan="2"><tt>__VA_OPT__</tt> for preprocessor comma elision</td> - <td><a href="https://wg21.link/p0306r4";>P0306R4</a></td> - <td class="full" align="center">Clang 6</td> + <td>Return type deduction for normal functions</td> + <td class="full" align="center">Clang 3.4</td> </tr> - <tr> <!-- from Rapperswil --> - <td><a href="https://wg21.link/p1042r1";>P1042R1</a></td> - <td class="full" align="center">Clang 9</td> - </tr> <tr> - <td>Designated initializers</td> - <td><a href="https://wg21.link/p0329r4";>P0329R4</a></td> - <td class="full" align="center">Clang 10</td> + <td>Initialized lambda captures</td> + <td><a href="https://wg21.link/n3648";>N3648</a></td> + <td class="full" align="center">Clang 3.4</td> </tr> <tr> - <td><i>template-parameter-list</i> for generic lambdas</td> - <td><a href="https://wg21.link/p0428r2";>P0428R2</a></td> - <td class="full" align="center">Clang 9</td> + <td>Generic lambdas</td> + <td><a href="https://wg21.link/n3649";>N3649</a></td> + <td class="full" align="center">Clang 3.4</td> </tr> - <tr id="p0734"> - <td rowspan="13">Concepts</td> - <td><a href="https://wg21.link/p0734r0";>P0734R0</a></td> - <td class="full" align="center">Clang 10</td> - </tr> - <tr> <!-- from Albuquerque --> - <td><a href="https://wg21.link/p0857r0";>P0857R0</a></td> - <td rowspan="1" class="full" align="center">Clang 16</td> - </tr> - <tr> <!-- from San Diego --> - <td><a href="https://wg21.link/p1084r2";>P1084R2</a></td> - <td rowspan="2" class="full" align="center">Clang 10</td> - </tr> - <tr> - <td><a href="https://wg21.link/p1141r2";>P1141R2</a></td> - </tr> - <tr> <!-- from Cologne --> - <td><a href="https://wg21.link/p0848r3";>P0848R3</a></td> - <td rowspan="1" class="partial" align="center"> - <details> - <summary>Clang 16 (Partial)</summary> - Because of other concepts implementation deficits, the __cpp_concepts macro is not yet set to 202002L. - Also, the related defect reports <a href="https://wg21.link/cwg1496";>DR1496</a> and - <a href="https://wg21.link/cwg1734";>DR1734</a> are not yet implemented. Accordingly, deleted - special member functions are treated as eligible even though they shouldn't be. - </details> - </td> - </tr> - <tr> - <td><a href="https://wg21.link/p1616r1";>P1616R1</a></td> - <td rowspan="2" class="full" align="center">Clang 10</td> - </tr> - <tr> - <td><a href="https://wg21.link/p1452r2";>P1452R2</a></td> - </tr> - <tr> <!-- from Belfast --> - <td><a href="https://wg21.link/p1972r0";>P1972R0</a></td> - <td rowspan="4" class="full" align="center">Clang 10</td> - </tr> - <tr> - <td><a href="https://wg21.link/p1980r0";>P1980R0</a></td> - </tr> - <tr> <!-- from Prague --> - <td><a href="https://wg21.link/p2103r0";>P2103R0</a></td> - </tr> - <tr> <!-- from February 2022 --> - <td><a href="https://wg21.link/p2493r0";>P2493R0</a></td> - </tr> - <tr> - <td><a href="https://wg21.link/p2092r0";>P2092R0</a></td> - <td rowspan="1" class="full" align="center">Clang 16</td> - </tr> - <tr> - <td><a href="https://wg21.link/p2113r0";>P2113R0</a></td> - <td rowspan="1" class="full" align="center">Clang 16</td> - </tr> - <!-- Albuquerque papers --> - <tr> - <td>Range-based for statements with initializer</td> - <td><a href="https://wg21.link/p0614r1";>P0614R1</a></td> - <td class="full" align="center">Clang 8</td> - </tr> - <tr> - <td>ADL and function templates that are not visible</td> - <td><a href="https://wg21.link/p0846r0";>P0846R0</a></td> - <td class="full" align="center">Clang 9</td> - </tr> - <tr> - <td><tt>const</tt> mismatch with defaulted copy constructor</td> - <td><a href="https://wg21.link/p0641r2";>P0641R2</a></td> - <td class="full" align="center">Clang 8</td> - </tr> - <tr> - <td rowspan="10">Consistent comparison (<tt>operator<=></tt>)</td> - <td><a href="https://wg21.link/p0515r3";>P0515R3</a></td> - <td rowspan="8" class="full" align="center">Clang 10</td> - </tr> - <tr> <!-- from Jacksonville --> - <td><a href="https://wg21.link/p0905r1";>P0905R1</a></td> - </tr> - <tr> <!-- from Rapperswil --> - <td><a href="https://wg21.link/p1120r0";>P1120R0</a></td> - </tr> - <tr> <!-- from Kona 2019 --> - <td><a href="https://wg21.link/p1185r2";>P1185R2</a></td> - </tr> - <tr> <!-- from Cologne --> - <td><a href="https://wg21.link/p1186r3";>P1186R3</a></td> - </tr> - <tr> - <td><a href="https://wg21.link/p1630r1";>P1630R1</a></td> - </tr> - <tr> <!-- from Belfast --> - <td><a href="https://wg21.link/p1946r0";>P1946R0</a></td> - </tr> - <tr> - <td><a href="https://wg21.link/p1959r0";>P1959R0</a></td> - </tr> - <tr> <!-- from Prague --> - <td><a href="https://wg21.link/p2002r1";>P2002R1</a></td> - <td class="partial" align="center">Partial</td> - </tr> - <tr> - <td><a href="https://wg21.link/p2085r0";>P2085R0</a></td> - <td class="full" align="center">Clang 14</td> - </tr> - <tr> - <td>Access checking on specializations</td> - <td><a href="https://wg21.link/p0692r1";>P0692R1</a></td> - <td class="full" align="center">Clang 14</td> - </tr> - <tr> - <td>Default constructible and assignable stateless lambdas</td> - <td><a href="https://wg21.link/p0624r2";>P0624R2</a></td> - <td class="full" align="center">Clang 8</td> - </tr> - <tr> - <td>Lambdas in unevaluated contexts</td> - <td><a href="https://wg21.link/p0315r4";>P0315R4</a></td> - <td class="full" align="center">Clang 17</td> - </tr> - <!-- Jacksonville papers --> - <tr> - <td><tt>[[no_unique_address]]</tt> attribute</td> - <td><a href="https://wg21.link/p0840r2";>P0840R2</a></td> - <td class="full" align="center">Clang 9</td> - </tr> - <tr> - <td><tt>[[likely]]</tt> and <tt>[[unlikely]]</tt> attributes</td> - <td><a href="https://wg21.link/p0479r5";>P0479R5</a></td> - <td class="full" align="center">Clang 12</td> - </tr> - <tr> - <td><tt>typename</tt> optional in more contexts</td> - <td><a href="https://wg21.link/p0634r3";>P0634R3</a></td> - <td class="full" align="center">Clang 16</td> - </tr> - <tr> - <td>Pack expansion in lambda <i>init-capture</i></td> - <td><a href="https://wg21.link/p0780r2";>P0780R2</a></td> - <td class="full" align="center">Clang 9</td> - </tr> - <!-- Rapperswil papers --> - <tr> - <td rowspan="2">Class types as non-type template parameters</td> - <td><a href="https://wg21.link/p0732r2";>P0732R2</a></td> - <td rowspan="2" class="partial" align="center">Partial</td> - </tr> - <tr> <!-- from Belfast --> - <td><a href="https://wg21.link/p1907r1";>P1907R1</a></td> - </tr> - <tr> - <td>Destroying operator delete</td> - <td><a href="https://wg21.link/p0722r3";>P0722R3</a></td> - <td class="full" align="center">Clang 6</td> - </tr> - <tr> - <td rowspan="7">Relaxations of <tt>constexpr</tt> restrictions</td> - <td><a href="https://wg21.link/p1064r0";>P1064R0</a></td> - <td class="full" align="center">Clang 9</td> - </tr> - <tr> <!-- from San Diego --> - <td><a href="https://wg21.link/p1002r1";>P1002R1</a></td> - <td class="full" align="center">Clang 8</td> - </tr> - <tr> - <td><a href="https://wg21.link/p1327r1";>P1327R1</a></td> - <td rowspan="2" class="full" align="center">Clang 9</td> - </tr> - <tr> - <td><a href="https://wg21.link/p1330r0";>P1330R0</a></td> - </tr> - <tr> <!-- from Cologne --> - <td><a href="https://wg21.link/p1331r2";>P1331R2</a></td> - <td rowspan="3" class="full" align="center">Clang 10</td> - </tr> - <tr> - <td><a href="https://wg21.link/p1668r1";>P1668R1</a></td> - </tr> - <tr> - <td><a href="https://wg21.link/p0784r7";>P0784R7</a></td> - </tr> - <tr> - <td>Prohibit aggregates with user-declared constructors</td> - <td><a href="https://wg21.link/p1008r1";>P1008R1</a></td> - <td class="full" align="center">Clang 8</td> - </tr> - <tr> - <td>Feature test macros</td> - <td><a href="https://wg21.link/p0941r2";>P0941R2</a></td> - <td class="full" align="center"><a href="#sd6">(see below)</a></td> + <tr> + <td>Variable templates</td> + <td><a href="https://wg21.link/n3651";>N3651</a></td> + <td class="full" align="center">Clang 3.4</td> </tr> <tr> - <td><tt>explicit(bool)</tt></td> - <td><a href="https://wg21.link/p0892r2";>P0892R2</a></td> - <td class="full" align="center">Clang 9</td> - </tr> - <!-- San Diego papers --> - <tr> - <td>Signed integers are two's complement</td> - <td><a href="https://wg21.link/p1236r1";>P1236R1</a></td> - <td class="full" align="center">Clang 9</td> - </tr> - <tr> - <td><tt>char8_t</tt></td> - <td><a href="https://wg21.link/p0482r6";>P0482R6</a></td> - <td class="full" align="center">Clang 7 <a href="#p0482">(11)</a></td> - </tr> - <tr> - <td rowspan=2>Immediate functions (<tt>consteval</tt>)</td> - <td><a href="https://wg21.link/p1073r3";>P1073R3</a></td> - <td class="partial" align="center"> - <details><summary>Clang 15 (Partial)</summary> - Clang still incorrectly defers some consteval executions to runtime, - resulting in CodeGen crashes. Additionally, Clang does not properly - handle default arguments in consteval functions under all - circumstances. - </details> - </td> + <td>Relaxing requirements on constexpr functions</td> + <td><a href="https://wg21.link/n3652";>N3652</a></td> + <td class="full" align="center">Clang 3.4</td> </tr> - <tr> <!-- from Prague --> - <td><a href="https://wg21.link/p1937r2";>P1937R2</a></td> - <td class="full" align="center">Clang 14</td> - </tr> <tr> - <td><tt>std::is_constant_evaluated</tt></td> - <td><a href="https://wg21.link/p0595r2";>P0595R2</a></td> - <td class="full" align="center">Clang 9</td> + <td>Member initializers and aggregates</td> + <td><a href="https://wg21.link/n3653";>N3653</a></td> + <td class="full" align="center">Clang 3.3</td> </tr> <tr> - <td>Nested inline namespaces</td> - <td><a href="https://wg21.link/p1094r2";>P1094R2</a></td> - <td class="full" align="center">Clang 8</td> + <td>Clarifying memory allocation</td> + <td><a href="https://wg21.link/n3664";>N3664</a></td> + <td class="full" align="center">Clang 3.4</td> </tr> - <!-- Kona 2019 papers --> <tr> - <td rowspan="2">Structured binding extensions</td> - <td><a href="https://wg21.link/p1091r3";>P1091R3</a></td> - <td rowspan="2" class="full" align="center">Clang 16</td> + <td><tt>[[deprecated]]</tt> attribute</td> + <td><a href="https://wg21.link/n3760";>N3760</a></td> + <td class="full" align="center">Clang 3.4</td> </tr> - <tr> - <td><a href="https://wg21.link/p1381r1";>P1381R1</a></td> - </tr> <tr> - <td rowspan="2">Stronger Unicode requirements</td> - <td><a href="https://wg21.link/p1041r4";>P1041R4</a></td> - <td rowspan="2" class="full" align="center">Yes</td> + <td>Single quotation mark as digit separator</td> + <td><a href="https://wg21.link/n3781";>N3781</a></td> + <td class="full" align="center">Clang 3.4</td> </tr> - <tr> - <td><a href="https://wg21.link/p1139r2";>P1139R2</a></td> - </tr> <tr> - <td rowspan="2">Parenthesized initialization of aggregates</td> - <td><a href="https://wg21.link/p0960r3";>P0960R3</a></td> - <td rowspan="2" class="none" align="center">No</td> - </tr> - <tr> <!-- from Belfast --> - <td><a href="https://wg21.link/p1975r0";>P1975R0</a></td> - </tr> - <tr> - <td rowspan="12">Modules</td> - <td><a href="https://wg21.link/p1103r3";>P1103R3</a></td> - <td class="full" align="center">Clang 15</td> + <td>C++ Sized Deallocation</td> + <td><a href="https://wg21.link/n3778";>N3778</a></td> + <td class="full" align="center">Clang 3.4 <a href="#n3778">(7)</a></td> </tr> - <tr> <!-- from Cologne --> - <td><a href="https://wg21.link/p1766r1";>P1766R1</a> (<a href="#dr">DR</a>)</td> - <td class="full" align="center">Clang 11</td> - </tr> - <tr> - <td><a href="https://wg21.link/p1811r0";>P1811R0</a></td> - <td class="none" align="center">No</td> - </tr> - <tr> - <td><a href="https://wg21.link/p1703r1";>P1703R1</a></td> - <td class="none" align="center">Subsumed by P1857</td> - </tr> - <tr> <!-- from Belfast --> - <td><a href="https://wg21.link/p1874r1";>P1874R1</a></td> - <td class="full" align="center">Clang 15</td> - </tr> - <tr> <!-- from Belfast --> - <td><a href="https://wg21.link/p1979r0";>P1979R0</a></td> - <td class="none" align="center">No</td> - </tr> - <tr> <!-- from Prague --> - <td><a href="https://wg21.link/p1779r3";>P1779R3</a></td> - <td class="full" align="center">Clang 15</td> - </tr> - <tr> - <td><a href="https://wg21.link/p1857r3";>P1857R3</a></td> - <td class="none" align="center">No</td> - </tr> - <tr> - <td><a href="https://wg21.link/p2115r0";>P2115R0</a></td> - <td class="partial" align="center">Partial</td> - </tr> - <tr> - <td><a href="https://wg21.link/p1815r2";>P1815R2</a></td> - <td class="partial" align="center">Partial</td> - </tr> - <tr> <!-- from Kona 2022 --> - <td><a href="https://wg21.link/P2615R1";>P2615R1</a> (<a href="#dr">DR</a>)</td> - <td class="none" align="center">No</td> - </tr> - <tr> <!-- from Issaquah 2023 --> - <td><a href="https://wg21.link/P2788R0";>P2788R0</a> (<a href="#dr">DR</a>)</td> - <td class="none" align="center">No</td> +</table> + +<p> +<span id="n3778">(7): In Clang 3.7 and later, sized deallocation is only enabled +if the user passes the <code>-fsized-deallocation</code> flag. The user must +supply definitions of the sized deallocation functions, either by providing them +explicitly or by using a C++ standard library that does. <code>libstdc++</code> +added these functions in version 5.0, and <code>libc++</code> added them in +version 3.7. +</span> +</p> +</details> + +<h2 id="cxx11">C++11 implementation status</h2> + +<p>Clang 3.3 and later implement all of the <a + href="https://www.iso.org/standard/50372.html";>ISO + C++ 2011 standard</a>.</p> + +<p>You can use Clang in C++11 mode with the <code>-std=c++11</code> +option. Clang's C++11 mode can be used with +<a href="https://libcxx.llvm.org/";>libc++</a> or with gcc's libstdc++.</p> + +<details> +<summary>List of features and minimum Clang version with support</summary> + +<table width="689" border="1" cellspacing="0"> + <tr> + <th>Language Feature</th> + <th>C++11 Proposal</th> + <th>Available in Clang?</th> + </tr> + <tr> + <td rowspan="2">Rvalue references</td> + <td><a href="https://wg21.link/n2118";>N2118</a></td> + <td class="full" align="center">Clang 2.9</td> + <tr> <!-- from Kona 2019--> + <td><a href="https://wg21.link/p1825r0";>P1825R0</a> (<a href="#dr">DR</a>)</td> + <td class="full" align="center">Clang 13</td> </tr> + </tr> <tr> - <td>Coroutines</td> - <td><a href="https://wg21.link/p0912r5";>P0912R5</a></td> - <td class="partial" align="center"> - <details><summary>Partial</summary> - Fully supported on all targets except Windows, which - still has some stability and ABI issues. - </details></td> + <td> Rvalue references for <code>*this</code></td> + <td><a href="https://wg21.link/n2439";>N2439</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> - <!-- Cologne 2019 papers --> <tr> - <td>Deprecate <tt>a[b,c]</tt></td> - <td><a href="https://wg21.link/p1161r3";>P1161R3</a></td> - <td class="full" align="center">Clang 9</td> + <td>Initialization of class objects by rvalues</td> + <td><a href="https://wg21.link/n1610";>N1610</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>Deprecate some problematic uses of <tt>volatile</tt></td> - <td><a href="https://wg21.link/p1152r4";>P1152R4</a></td> - <td class="full" align="center">Clang 10</td> + <td>Non-static data member initializers</td> + <td><a href="https://wg21.link/n2756";>N2756</a></td> + <td class="full" align="center">Clang 3.0</td> </tr> <tr> - <td><tt>[[nodiscard("with reason")]]</tt></td> - <td><a href="https://wg21.link/p1301r4";>P1301R4</a></td> - <td class="full" align="center">Clang 9</td> + <td>Variadic templates</td> + <td><a href="https://wg21.link/n2242";>N2242</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td><tt>using enum</tt></td> - <td><a href="https://wg21.link/p1099r5";>P1099R5</a></td> - <td class="full" align="center">Clang 13</td> + <td> Extending variadic template template parameters</td> + <td><a href="https://wg21.link/n2555";>N2555</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td rowspan=2>Class template argument deduction for aggregates</td> - <td><a href="https://wg21.link/p1816r0";>P1816R0</a></td> - <td rowspan=2 class="none" align="center">No</td> + <td rowspan="3">Initializer lists</td> + <td><a href="https://wg21.link/n2672";>N2672</a></td> + <td class="full" align="center">Clang 3.1</td> </tr> - <tr> <!-- from Prague --> - <td><a href="https://wg21.link/p2082r1";>P2082R1</a></td> + <tr> <!-- from Kona 2019--> + <td><a href="https://wg21.link/p1009r2";>P1009R2</a> (<a href="#dr">DR</a>)</td> + <td class="full" align="center">Clang 9</td> + </tr> + <tr> <!-- from Prague--> + <td><a href="https://wg21.link/p1957r2";>P1957R2</a> (<a href="#dr">DR</a>)</td> + <td class="full" align="center">Clang 11</td> </tr> <tr> - <td>Class template argument deduction for alias templates</td> - <td><a href="https://wg21.link/p1814r0";>P1814R0</a></td> - <td class="none" align="center">No</td> + <td>Static assertions</td> + <td><a href="https://wg21.link/n1720";>N1720</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>Permit conversions to arrays of unknown bound</td> - <td><a href="https://wg21.link/p0388r4";>P0388R4</a></td> - <td class="full" align="center">Clang 14</td> + <td><code>auto</code>-typed variables</td> + <td><a href="https://wg21.link/n1984";>N1984</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td><tt>constinit</tt></td> - <td><a href="https://wg21.link/p1143r2";>P1143R2</a></td> - <td class="full" align="center">Clang 10</td> + <td> Multi-declarator <code>auto</code></td> + <td><a href="https://wg21.link/n1737";>N1737</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> - <!-- Prague 2019 papers --> <tr> - <td>Pseudo-destructors end object lifetimes</td> - <td><a href="https://wg21.link/p0593r6";>P0593R6</a> (<a href="#dr">DR</a>)</td> - <td class="full" align="center">Clang 11</td> + <td> Removal of auto as a storage-class specifier</td> + <td><a href="https://wg21.link/n2546";>N2546</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>More implicit moves</td> - <td><a href="https://wg21.link/p1825r0";>P1825R0</a> (<a href="#dr">DR</a>)</td> - <td class="full" align="center">Clang 13</td> + <td> New function declarator syntax</td> + <td><a href="https://wg21.link/n2541";>N2541</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> -</table> - -<p> -<span id="p0482">(11): Prior to Clang 8, this feature is not enabled by -<tt>-std=c++20</tt>, but can be enabled with <tt>-fchar8_t</tt>. -</span> -</p> -</details> - -<h2 id="cxx23">C++23 implementation status</h2> - -<!-- TODO add link to the ISO Standard after it's published. --> -<p>Clang has support for some of the features of the ISO C++ 2023 standard.</p> - -<p>You can use Clang in C++23 mode with the <code>-std=c++23</code> option.</p> - -<details open> -<summary>List of features and minimum Clang version with support</summary> - -<table width="689" border="1" cellspacing="0"> - <tr> - <th>Language Feature</th> - <th>C++23 Proposal</th> - <th>Available in Clang?</th> - </tr> - <!-- Fall 2020 papers --> <tr> - <td>Literal suffix <tt>uz</tt>, <tt>z</tt> for <tt>size_t</tt>, <tt>ssize_t</tt></td> - <td><a href="https://wg21.link/p0330r8";>P0330R8</a></td> - <td class="full" align="center">Clang 13</td> + <td rowspan="2">Lambda expressions</td> + <td><a href="https://wg21.link/n2927";>N2927</a></td> + <td class="full" align="center">Clang 3.1</td> </tr> - <!-- Spring 2021 papers --> + <tr> + <!-- from Albuquerque 2017 --> + <td><a href="https://wg21.link/p0588r1";>P0588R1</a> (<a href="#dr">DR</a>)</td> + <td class="none" align="center">No</td> + </tr> <tr> - <td>Make <tt>()</tt> in lambdas optional in all cases</td> - <td><a href="https://wg21.link/p1102r2";>P1102R2</a></td> - <td class="full" align="center">Clang 13</td> + <td>Declared type of an expression</td> + <td><a href="https://wg21.link/n2343";>N2343</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>Simpler implicit move</td> - <td><a href="https://wg21.link/p2266r1";>P2266R1</a></td> - <td class="full" align="center">Clang 13</td> + <td> Incomplete return types</td> + <td><a href="https://wg21.link/n3276";>N3276</a></td> + <td class="full" align="center">Clang 3.1</td> </tr> <tr> - <td><tt>if consteval</tt></td> - <td><a href="https://wg21.link/P1938R3";>P1938R3</a></td> - <td class="full" align="center">Clang 14</td> + <td>Right angle brackets</td> + <td><a href="https://wg21.link/n1757";>N1757</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>Allow duplicate attributes</td> - <td><a href="https://wg21.link/P2156R1";>P2156R1</a></td> - <td class="full" align="center">Clang 13</td> + <td>Default template arguments for function templates</td> + <td><a href="https://wg21.link/cwg226";>DR226</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>Narrowing contextual conversions to bool</td> - <td><a href="https://wg21.link/P1401R5";>P1401R5</a></td> - <td class="full" align="center">Clang 14</td> + <td>Solving the SFINAE problem for expressions</td> + <td><a href="https://wg21.link/n2634";>DR339</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>Trimming whitespaces before line splicing</td> - <td><a href="https://wg21.link/P2223R2";>P2223R2</a></td> - <td class="full" align="center">Yes</td> + <td>Alias templates</td> + <td><a href="https://wg21.link/n2258";>N2258</a></td> + <td class="full" align="center">Clang 3.0</td> </tr> <tr> - <td>Make declaration order layout mandated</td> - <td><a href="https://wg21.link/p1847r4";>P1874R4</a></td> - <td class="full" align="center">Yes</td> + <td>Extern templates</td> + <td><a href="https://wg21.link/n1987";>N1987</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>C++ identifier syntax using UAX 31</td> - <td><a href="https://wg21.link/P1949R7";>P1949R7</a></td> - <td class="full" align="center">Clang 14</td> + <td>Null pointer constant</td> + <td><a href="https://wg21.link/n2431";>N2431</a></td> + <td class="full" align="center">Clang 3.0</td> </tr> <tr> - <td>Mixed string literal concatenation</td> - <td><a href="https://wg21.link/p2201r1";>P2201R1</a></td> - <td class="full" align="center">Yes</td> + <td>Strongly-typed enums</td> + <td><a href="https://wg21.link/n2347";>N2347</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> - <!-- October 2021 papers --> <tr> - <td rowspan=2>Deducing this</td> - <td><a href="https://wg21.link/P0847R7";>P0847R7</a></td> - <td class="none" align="center">No</td> + <td>Forward declarations for enums</td> + <td><a href="https://wg21.link/n2764";>N2764</a> + <br><a href="https://wg21.link/cwg1206";>DR1206</a></td> + <td class="full" align="center">Clang 3.1</td> </tr> <tr> - <td><a href="https://wg21.link/P2797R0";>P2797R0</a></td> - <td class="none" align="center">No</td> + <td>Standardized attribute syntax</td> + <td><a href="https://wg21.link/n2761";>N2761</a></td> + <td class="full" align="center">Clang 3.3 <a href="#n2761">(1)</a></td> </tr> <tr> - <td rowspan=2>Change scope of lambda trailing-return-type</td> - <td><a href="https://wg21.link/P2036R3";>P2036R3</a></td> - <td rowspan=2 class="unreleased" align="center">Clang 17</td> + <td rowspan="2">Generalized constant expressions</td> + <td><a href="https://wg21.link/n2235";>N2235</a></td> + <td class="full" align="center">Clang 3.1</td> </tr> + <tr> + <!-- from Albuquerque 2017 --> + <td><a href="https://wg21.link/p0859r0";>P0859R0</a> (<a href="#dr">DR</a>)</td> + <td class="full" align="center">Clang 8</td> + </tr> <tr> - <td><a href="https://wg21.link/P2579R0";>P2579R0</a></td> + <td>Alignment support</td> + <td><a href="https://wg21.link/n2341";>N2341</a></td> + <td class="full" align="center">Clang 3.3</td> </tr> <tr> - <td>Multidimensional subscript operator</td> - <td><a href="https://wg21.link/P2128R6";>P2128R6</a></td> - <td class="full" align="center">Clang 15</td> + <td>Conditionally-support behavior</td> + <td><a href="https://wg21.link/n1627";>N1627</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>Non-literal variables (and labels and gotos) in constexpr functions</td> - <td><a href="https://wg21.link/P2242R3";>P2242R3</a></td> - <td class="full" align="center">Clang 15</td> + <td>Changing undefined behavior into diagnosable errors</td> + <td><a href="https://wg21.link/n1727";>N1727</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>Character encoding of diagnostic text</td> - <td><a href="https://wg21.link/P2246R1";>P2246R1</a></td> - <td class="full" align="center">Yes</td> + <td>Delegating constructors</td> + <td><a href="https://wg21.link/n1986";>N1986</a></td> + <td class="full" align="center">Clang 3.0</td> + </tr> + <tr> + <td rowspan="2">Inheriting constructors</td> + <td><a href="https://wg21.link/n2540";>N2540</a></td> + <td class="full" align="center">Clang 3.3</td> + </tr> + <tr> + <!-- from Kona 2015 --> + <td><a href="https://wg21.link/p0136r1";>P0136R1</a> (<a href="#dr">DR</a>)</td> + <td class="full" align="center">Clang 3.9</td> + </tr> + <tr> + <td>Explicit conversion operators</td> + <td><a href="https://wg21.link/n2437";>N2437</a></td> + <td class="full" align="center">Clang 3.0</td> + </tr> + <tr> + <td>New character types</td> + <td><a href="https://wg21.link/n2249";>N2249</a></td> + <td class="full" align="center">Clang 2.9</td> + </tr> + <tr> + <td>Unicode string literals</td> + <td><a href="https://wg21.link/n2442";>N2442</a></td> + <td class="full" align="center">Clang 3.0</td> + </tr> + <tr> + <td>Raw string literals</td> + <td><a href="https://wg21.link/n2442";>N2442</a></td> + <td class="full" align="center">Clang 3.0</td> </tr> <tr> - <td>Character sets and encodings</td> - <td><a href="https://wg21.link/P2314R4";>P2314R4</a></td> - <td class="full" align="center">Yes</td> + <td>Universal character names in literals</td> + <td><a href="https://wg21.link/n2170";>N2170</a></td> + <td class="full" align="center">Clang 3.1</td> </tr> <tr> - <td>Consistent character literal encoding</td> - <td><a href="https://wg21.link/P2316R2";>P2316R2</a></td> - <td class="full" align="center">Yes</td> + <td>User-defined literals</td> + <td><a href="https://wg21.link/n2765";>N2765</a></td> + <td class="full" align="center">Clang 3.1</td> </tr> <tr> - <td>Add support for preprocessing directives elifdef and elifndef</td> - <td><a href="https://wg21.link/P2334R1";>P2334R1</a></td> - <td class="full" align="center">Clang 13</td> + <td>Standard Layout Types</td> + <td><a href="https://wg21.link/n2342";>N2342</a></td> + <td class="full" align="center">Clang 3.0</td> </tr> <tr> - <td>Extend init-statement to allow alias-declaration</td> - <td><a href="https://wg21.link/P2360R0";>P2360R0</a></td> - <td class="full" align="center">Clang 14</td> + <td rowspan="2">Defaulted functions</td> + <td><a href="https://wg21.link/n2346";>N2346</a></td> + <td class="full" align="center">Clang 3.0</td> </tr> + <tr> <!-- from Kona 2019--> + <td><a href="https://wg21.link/p1286r2";>P1286R2</a> (<a href="#dr">DR</a>)</td> + <td class="full" align="center">Clang 9</td> + </tr> <tr> - <td>auto(x): decay-copy in the language</td> - <td><a href="https://wg21.link/P0849R8";>P0849R8</a></td> - <td class="full" align="center">Clang 15</td> + <td>Deleted functions</td> + <td><a href="https://wg21.link/n2346";>N2346</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> - <!-- February 2022 papers --> <tr> - <td>Attributes on Lambda-Expressions</td> - <td><a href="https://wg21.link/P2173R1";>P2173R1</a></td> - <td class="full" align="center">Clang 13</td> + <td>Extended friend declarations</td> + <td><a href="https://wg21.link/n1791";>N1791</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td><tt>constexpr</tt> for <tt><cmath></tt> and <tt><cstdlib></tt></td> - <td><a href="https://wg21.link/P0533R9";>P0533R9</a></td> - <td class="none" align="center">No</td> + <td>Extending <code>sizeof</code></td> + <td><a href="https://wg21.link/n2253";>N2253</a> + <br><a href="https://wg21.link/cwg850";>DR850</a></td> + <td class="full" align="center">Clang 3.1</td> </tr> <tr> - <td>Type trait to determine if a reference binds to a temporary</td> - <td><a href="https://wg21.link/P2255R2";>P2255R2</a></td> - <td class="partial" align="center"> - <details><summary>Partial</summary> - Clang provides a <tt>__reference_binds_to_temporary</tt> type trait - builtin, with which the library facility can be partially implemented. - Both <tt>__reference_constructs_from_temporary</tt> and - <tt>__reference_converts_from_temporary</tt> builtins should be - provided, following the normal cross-vendor convention to implement - traits requiring compiler support directly. - </details></td> - </td> + <td>Inline namespaces</td> + <td><a href="https://wg21.link/n2535";>N2535</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> - <!-- July 2022 papers --> <tr> - <td>The Equality Operator You Are Looking For</td> - <td><a href="https://wg21.link/P2468R2";>P2468R2</a></td> - <td class="full" align="center">Clang 16</td> + <td>Unrestricted unions</td> + <td><a href="https://wg21.link/n2544";>N2544</a></td> + <td class="full" align="center">Clang 3.1</td> </tr> <tr> - <td>De-deprecating volatile compound operations</td> - <td><a href="https://wg21.link/P2327R1";>P2327R1</a></td> - <td class="full" align="center">Clang 15</td> + <td>Local and unnamed types as template arguments</td> + <td><a href="https://wg21.link/n2657";>N2657</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>Support for <code>#warning</code></td> - <td><a href="https://wg21.link/P2437R1";>P2437R1</a></td> - <td class="full" align="center">Yes</td> + <td rowspan="2">Range-based for</td> + <td><a href="https://wg21.link/n2930";>N2930</a></td> + <td class="full" align="center">Clang 3.0</td> </tr> + <tr> + <!-- from Jacksonville 2018 --> + <td><a href="https://wg21.link/p0962r1";>P0962R1</a> (<a href="#dr">DR</a>)</td> + <td class="full" align="center">Clang 8</td> + </tr> <tr> - <td>Remove non-encodable wide character literals and multicharacter wide character literals</td> - <td><a href="https://wg21.link/P2362R3";>P2362R3</a></td> - <td class="full" align="center">Clang 14</td> + <td>Explicit virtual overrides</td> + <td><a href="https://wg21.link/n2928";>N2928</a> + <br><a href="https://wg21.link/n3206";>N3206</a> + <br><a href="https://wg21.link/n3272";>N3272</a></td> + <td class="full" align="center">Clang 3.0</td> </tr> <tr> - <td>Labels at the end of compound statements</td> - <td><a href="https://wg21.link/P2324R2";>P2324R2</a></td> - <td class="full" align="center">Clang 16</td> + <td>Minimal support for garbage collection and reachability-based leak detection</td> + <td><a href="https://wg21.link/n2670";>N2670</a></td> + <td class="na" align="center">N/A <a href="#n2670">(2)</a></td> </tr> <tr> - <td>Delimited escape sequences</td> - <td><a href="https://wg21.link/P2290R3";>P2290R3</a></td> - <td class="full" align="center">Clang 15</td> + <td>Allowing move constructors to throw [noexcept]</td> + <td><a href="https://wg21.link/n3050";>N3050</a></td> + <td class="full" align="center">Clang 3.0</td> </tr> <tr> - <td>Named universal character escapes</td> - <td><a href="https://wg21.link/P2071R2";>P2071R2</a></td> - <td class="full" align="center">Clang 15</td> + <td>Defining move special member functions</td> + <td><a href="https://wg21.link/n3053";>N3053</a></td> + <td class="full" align="center">Clang 3.0</td> </tr> - <tr> - <td>Relaxing some constexpr restrictions</td> - <td><a href="https://wg21.link/P2448R2";>P2448R2</a></td> - <td class="partial" align="center"> - <details><summary>Clang 17 (Partial)</summary> - We do not support outside of defaulted special memeber functions the change that constexpr functions no - longer have to be constexpr compatible but rather support a less restricted requirements for constexpr - functions. Which include allowing non-literal types as return values and parameters, allow calling of - non-constexpr functions and constructors. - </details></td> - </td> + + <tr class="separator"> + <th align="center" colspan="3">Concurrency</th> </tr> <tr> - <td>Using unknown pointers and references in constant expressions</td> - <td><a href="https://wg21.link/P2280R4";>P2280R4</a></td> - <td class="none" align="center">No</td> + <td>Sequence points</td> + <td><a href="https://wg21.link/n2239";>N2239</a></td> + <td class="full" align="center">Clang 3.3</td> </tr> <tr> - <td>static <code>operator()</code></td> - <td><a href="https://wg21.link/P1169R4";>P1169R4</a></td> - <td class="full" align="center">Clang 16</td> + <td>Atomic operations</td> + <td><a href="https://wg21.link/n2427";>N2427</a></td> + <td class="full" align="center">Clang 3.1</td> </tr> <tr> - <td>Extended floating-point types and standard names</td> - <td><a href="https://wg21.link/P1467R9";>P1467R9</a></td> - <td class="none" align="center">No</td> + <td>Strong Compare and Exchange</td> + <td><a href="https://wg21.link/n2748";>N2748</a></td> + <td class="full" align="center">Clang 3.1 <a href="#n2748">(3)</a></td> </tr> <tr> - <td>Class template argument deduction from inherited constructors</td> - <td><a href="https://wg21.link/P2582R1";>P2582R1</a></td> - <td class="none" align="center">No</td> + <td>Bidirectional Fences</td> + <td><a href="https://wg21.link/n2752";>N2752</a></td> + <td class="full" align="center">Clang 3.1</td> </tr> + <tr> - <td>Portable assumptions</td> - <td><a href="https://wg21.link/P1774R8";>P1774R8</a></td> - <td class="none" align="center">No</td> + <td>Memory model</td> + <td><a href="https://wg21.link/n2429";>N2429</a></td> + <td class="full" align="center">Clang 3.2</td> </tr> <tr> - <td>Support for UTF-8 as a portable source file encoding</td> - <td><a href="https://wg21.link/P2295R6";>P2295R6</a></td> - <td class="full" align="center">Clang 15</td> + <td>Data-dependency ordering: atomics and memory model</td> + <td><a href="https://wg21.link/n2664";>N2664</a></td> + <td class="full" align="center">Clang 3.2 <a href="#n2664">(4)</a></td> </tr> <tr> - <td><code>char8_t</code> Compatibility and Portability Fix</td> - <td><a href="https://wg21.link/P2513R3";>P2513R3</a></td> - <td class="full" align="center">Clang 16</td> + <td>Propagating exceptions</td> + <td><a href="https://wg21.link/n2179";>N2179</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>Relax requirements on <code>wchar_t</code> to match existing practices</td> - <td><a href="https://wg21.link/P2460R2";>P2460R2</a></td> - <td class="full" align="center">Yes</td> + <td>Allow atomics use in signal handlers</td> + <td><a href="https://wg21.link/n2547";>N2547</a></td> + <td class="full" align="center">Clang 3.1</td> </tr> <tr> - <td>Explicit lifetime management</td> - <td><a href="https://wg21.link/P2590R2";>P2590R2</a></td> - <td class="none" align="center">No</td> + <td>Thread-local storage</td> + <td><a href="https://wg21.link/n2659";>N2659</a></td> + <td class="full" align="center">Clang 3.3 <a href="#n2659">(5)</a></td> </tr> - <!-- November 2022 (Kona) papers --> <tr> - <td>static <code>operator[]</code></td> - <td><a href="https://wg21.link/P2589R1";>P2589R1</a></td> - <td class="full" align="center">Clang 16</td> + <td>Dynamic initialization and destruction with concurrency</td> + <td><a href="https://wg21.link/n2660";>N2660</a></td> + <td class="full" align="center">Clang 2.9</td> + </tr> + + <tr class="separator"> + <th align="center" colspan="3">C99 Features in C++11</th> </tr> <tr> - <td>Permitting static constexpr variables in constexpr functions</td> - <td><a href="https://wg21.link/P2647R1";>P2647R1</a></td> - <td class="full" align="center">Clang 16</td> + <td><code>__func__</code> predefined identifier</td> + <td><a href="https://wg21.link/n2340";>N2340</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>consteval needs to propagate up</td> - <td><a href="https://wg21.link/P2564R3";>P2564R3</a> (<a href="#dr">DR</a>)</td> - <td class="none" align="center">No</td> + <td>C99 preprocessor</td> + <td><a href="https://wg21.link/n1653";>N1653</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> <tr> - <td>Lifetime extension in range-based for loops</td> - <td><a href="https://wg21.link/P2718R0";>P2718R0</a></td> - <td class="none" align="center">No</td> + <td><code>long long</code></td> + <td><a href="https://wg21.link/n1811";>N1811</a></td> + <td class="full" align="center">Clang 2.9</td> </tr> - <!--Issaquah 2023 papers--> <tr> - <td>Referencing The Unicode Standard</td> - <td><a href="https://wg21.link/P2736R2";>P2736R2</a></td> - <td class="full" align="center">Yes</td> + <td>Extended integral types</td> + <td><a href="https://wg21.link/n1988";>N1988</a></td> + <td class="na" align="center">N/A <a href="#n1988">(6)</a></td> </tr> </table> -</details> -<h2 id="cxx26">C++2c implementation status</h2> +<p> +<span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute +has no effect.</span><br> +<span id="n2670">(2): No compiler changes are required for an implementation +such as Clang that does not provide garbage collection.</span><br> +<span id="n2748">(3): All compare-exchange operations are emitted as +strong compare-exchanges.</span><br> +<span id="n2664">(4): <code>memory_order_consume</code> is lowered to +<code>memory_order_acquire</code>.</span><br> +<span id="n2659">(5): <code>thread_local</code> support +requires a C++ runtime library providing <code>__cxa_thread_atexit</code>, such +as <a href="https://libcxxabi.llvm.org";>libc++abi</a> 3.6 or later, +or libsupc++ 4.8 or later.</span><br> +<span id="n1988">(6): No compiler changes are required for an implementation +such as Clang that does not provide any extended integer types. +<code>__int128</code> is not treated as an extended integer type, +because changing <code>intmax_t</code> would be an ABI-incompatible +change.</span> +</p> +</details> -<!-- TODO add link to the ISO Standard after it's published. --> -<p>Clang has support for some of the features of the C++ standard following -C++23, informally referred to as C++26.</p> -<p>You can use Clang in C++2c mode with the <code>-std=c++2c</code> option.</p> +<h2 id="cxx98">C++98 implementation status</h2> -<details open> -<summary>List of features and minimum Clang version with support</summary> -<table width="689" border="1" cellspacing="0"> - <tr> - <th>Language Feature</th> - <th>C++26 Proposal</th> - <th>Available in Clang?</th> - </tr> - </table> - </details> +<p>Clang implements all of the ISO C++ 1998 standard + (including the defects addressed in the ISO C++ 2003 standard) + except for <tt>export</tt> (which was removed in C++11). <h2 id="dr">Defect reports</h2> _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
