Merged [51699] and [51700] from trunk to release.

Closes #1897


[SVN r51703]

libs/libraries.htm

@@ -244,7 +244,7 @@ how to download, build, and install the libraries.</p>
         - Serialization for persistence and marshalling, from Robert Ramey</li>
     <li><a href="signals/index.html">signals</a> - managed signals &amp;
          slots callback implementation, from Doug Gregor.</li>
-    <li><a href="smart_ptr/index.html">smart_ptr</a> - Five smart
+    <li><a href="smart_ptr/index.html">smart_ptr</a> - Six smart
         pointer class templates, from Greg Colvin, Beman Dawes,
         Peter Dimov, and Darin Adler.</li>
     <li><a href="statechart/doc/index.html">statechart</a> - Arbitrarily

libs/smart_ptr

@@ -1 +1 @@
-Subproject commit 31e06b4a1d2bb84af98d6a9bd643016ac5831299
+Subproject commit 1742c37942455c617cf74dd48e41621ef3f2594e