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[C++] Implement LWG2296 helper intrinsic

Message ID 20170103105509.GC895@redhat.com
State New
Headers show

Commit Message

Jonathan Wakely Jan. 3, 2017, 10:55 a.m. UTC 
On 01/01/17 15:53 +0100, Jakub Jelinek wrote:
>On Sun, Jan 01, 2017 at 10:27:24AM -0400, Gerald Pfeifer wrote:

>> On Fri, 7 Oct 2016, Jakub Jelinek wrote:

>> > The following patch adds __builtin_addressof with the semantics it has in

>> > clang, i.e. it is a constexpr & operator alternative that never uses the

>> > overloaded & operator.

>>

>> Nice!

>>

>> Are you planning to document this in gcc-7/changes.html ?

>

>We shouldn't document the builtin, but that std::addressof is usable in

>constexpr contexts.  I'll defer documentation thereof to Jon, together with

>other libstdc++ changes.


I've committed this to wwwdocs.
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Patch

? htdocs/gcc-7/.changes.html.swp
Index: htdocs/gcc-7/changes.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-7/changes.html,v
retrieving revision 1.32
diff -u -r1.32 changes.html
--- htdocs/gcc-7/changes.html	27 Nov 2016 12:54:13 -0000	1.32
+++ htdocs/gcc-7/changes.html	3 Jan 2017 10:54:01 -0000
@@ -287,13 +287,30 @@ 
       <code>std::chrono::round</code>, and <code>std::chrono::abs</code>;
     </li>
     <li>
-      <code>std::clamp</code>;
+      <code>std::clamp</code>, <code>std::gcd</code>, <code>std::lcm</code>,
+      3-dimensional <code>std::hypot</code>;
+    </li>
+    <li><code>std::shared_mutex</code>;</li>
+    <li><code>std::default_searcher</code>,
+      <code>std::boyer_moore_searcher</code> and
+      <code>std::boyer_moore_horspool_searcher</code>;
+    </li>
+    <li>
+      Extraction and re-insertion of map and set nodes, <code>try_emplace</code>
+      members for maps, and functions for accessing containers
+      <code>std::size</code>, <code>std::empty</code>, and
+      <code>std::data</code>;
     </li>
     <li>
+      <code>std::shared_ptr</code> support for arrays,
       <code>std::shared_ptr&lt;T&gt;::weak_type</code>,
       <code>std::enable_shared_from_this&lt;T&gt;::weak_from_this()</code>,
       and <code>std::owner_less&lt;void&gt;</code>;
     </li>
+    <li><code>std::as_const</code>, <code>std::not_fn</code>,
+      <code>std::has_unique_object_representations</code>,
+      constexpr <code>std::addressof</code>.
+    </li>
   </ul>
   Thanks to Daniel Kr&uuml;gler, Tim Shen, Edward Smith-Rowland, and Ville Voutilainen for
   work on the C++17 support.