support for exception_ptr and nesting in boost::diagnostic_information

documentation update

[SVN r53038]

doc/error_info.html

@@ -71,6 +71,7 @@ typedef boost::<span class="RenoLink">error_info</span>&lt;struct tag_errno,int&
 </a><a href="error_info_value_type.html">error_info::value_type<br/>
 </a><a href="exception.html">exception<br/>
 </a><a href="exception_operator_shl.html">exception/operator&lt;&lt;<br/>
+</a><a href="exception_ptr.html">exception_ptr<br/>
 </a><a href="frequently_asked_questions.html">Frequently Asked Questions<br/>
 </a><a href="get_error_info.html">get_error_info<br/>
 </a><a href="tutorial_enable_error_info.html">Integrating Boost Exception in Existing Exception Class Hierarchies<br/>

doc/exception.html

@@ -55,6 +55,7 @@ boost
 </a><a href="exception_operator_shl.html">exception/operator&lt;&lt;<br/>
 </a><a href="exception_constructors.html">exception::exception<br/>
 </a><a href="exception_destructor.html">exception::~exception<br/>
+</a><a href="exception_ptr.html">exception_ptr<br/>
 </a><a href="frequently_asked_questions.html">Frequently Asked Questions<br/>
 </a><a href="get_error_info.html">get_error_info<br/>
 </a><a href="tutorial_enable_error_info.html">Integrating Boost Exception in Existing Exception Class Hierarchies<br/>

doc/exception_ptr.html

@@ -36,6 +36,8 @@ boost
 <li> It is illegal for multiple threads to modify the same <span class="RenoLink">exception_ptr</span> object concurrently.</li>
 <li> While calling <span class="RenoLink"><a href="current_exception.html">current_exception</a></span> makes a copy of the current exception object, it is still possible for the two copies to share internal state. Therefore, in general it is not safe to call <span class="RenoLink"><a href="rethrow_exception.html">rethrow_exception</a></span> concurrently to throw the same exception object into multiple threads.</li>
 </ul></div>
+<h4>Nesting of exceptions</h4>
+<p>An <span class="RenoLink">exception_ptr</span> can be added as <span class="RenoLink"><a href="error_info.html">error_info</a></span> to any boost::<span class="RenoLink"><a href="exception.html">exception</a></span>. This is a convenient way to nest exceptions. There is no limit on the depth of the nesting, however cyclic references result in undefined behavior.</p>
 </div><div class="RenoAutoDIV"><div class="RenoHR"><hr/></div>
 <h3>See Also:</h3>
 <div class="RenoPageList"><a href="boost-exception.html">Boost Exception<br/>