Primary template optional<> does not handle references

doc/html/boost_optional/relnotes.html

@@ -31,29 +31,38 @@ <h4>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_x_xx"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_x_xx">Boost
       Release X.XX</a>
     </h4>
-<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
-<li class="listitem">
-          Changed the implementation of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code>:
-          now it is a constant with internal linkage. This addresses <a href="https://svn.boost.org/trac/boost/ticket/11203" target="_top">Trac
-          #11203</a>.
-        </li>
-<li class="listitem">
+<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
           Now <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span></code> is specialized for reference
           parameters. This way the <code class="computeroutput"><span class="keyword">sizeof</span></code>
           of optional reference is that of a pointer, and a number of bugs is avoided.
-        </li>
-</ul></div>
+        </li></ul></div>
 <h4>
 <a name="boost_optional.relnotes.h1"></a>
+      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_60"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_60">Boost
+      Release 1.60</a>
+    </h4>
+<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
+          Changed the implementation of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code>
+          again. Now it is a const object with internal linkage (as any other tag).
+          This fixes <a href="https://svn.boost.org/trac/boost/ticket/11203" target="_top">Trac
+          #11203</a>.
+        </li></ul></div>
+<h4>
+<a name="boost_optional.relnotes.h2"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_59"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_59">Boost
       Release 1.59</a>
     </h4>
-<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
+<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
+<li class="listitem">
           For C++03 compilers, added 0-argument overload for member function <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code>,
           and therewith removed the dependency on <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">utility</span><span class="special">/</span><span class="identifier">in_place_factory</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>.
-        </li></ul></div>
+        </li>
+<li class="listitem">
+          Fixed <a href="https://svn.boost.org/trac/boost/ticket/11241" target="_top">Trac #11241</a>.
+        </li>
+</ul></div>
 <h4>
-<a name="boost_optional.relnotes.h2"></a>
+<a name="boost_optional.relnotes.h3"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_58"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_58">Boost
       Release 1.58</a>
     </h4>
@@ -89,7 +98,7 @@ <h4>
         </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h3"></a>
+<a name="boost_optional.relnotes.h4"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_57"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_57">Boost
       Release 1.57</a>
     </h4>
@@ -99,7 +108,7 @@ <h4>
           to fix C++03 compile error on <code class="computeroutput"><span class="identifier">logic_error</span><span class="special">(</span><span class="string">"..."</span><span class="special">)</span></code>"</em></span>.
         </li></ul></div>
 <h4>
-<a name="boost_optional.relnotes.h4"></a>
+<a name="boost_optional.relnotes.h5"></a>
       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_56"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_56">Boost
       Release 1.56</a>
     </h4>

doc/html/index.html

@@ -146,7 +146,7 @@ <h4>
 </div>
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
-<td align="left"><p><small>Last revised: October 05, 2015 at 14:34:49 GMT</small></p></td>
+<td align="left"><p><small>Last revised: February 12, 2016 at 21:19:23 GMT</small></p></td>
 <td align="right"><div class="copyright-footer"></div></td>
 </tr></table>
 <hr>

include/boost/none_t.hpp

@@ -29,7 +29,7 @@ class none_t {};
 struct none_t
 {
   struct init_tag{};
-  explicit none_t(init_tag){} // to prevent default constructor
+  explicit none_t(init_tag){} // to disable default constructor
 };
 
 #endif // old implementation workarounds