i have done in the following way.. even am getting some errors, did i
miss any of the headers,&nbsp; or added extra(added extra for sure). <br>
<br>
Any suggestions will be accepted<br>
<br>
&nbsp;&nbsp;&nbsp; #include &lt;boost/serialization/utility.hpp&gt;<br>
&nbsp;&nbsp;&nbsp; #include &lt;boost/serialization/collection_traits.hpp&gt;<br>
&nbsp;&nbsp;&nbsp; #include &lt;boost/serialization/serialization.hpp&gt;<br>
&nbsp;&nbsp;&nbsp; #include &lt;boost/serialization/base_object.hpp&gt;<br>
&nbsp;&nbsp;&nbsp; #include &lt;fstream&gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp; #include &lt;boost/archive/text_iarchive.hpp&gt;<br>
&nbsp;&nbsp;&nbsp; #include &lt;boost/archive/text_oarchive.hpp&gt;<br>
&nbsp;&nbsp;&nbsp; #include &lt;boost/serialization/assume_abstract.hpp&gt;<br>
<br>
&nbsp;
 class fd;&nbsp; <br>

<br>

 &nbsp;class base: class derived<br>

 &nbsp;{<br>

 &nbsp;.....<br>

 &nbsp; &nbsp; &nbsp;fd *ptr;<br>

 &nbsp;.....<br>

<br>

 &nbsp; &nbsp; &nbsp;friend class boost::serialization::access;<br>

 &nbsp; &nbsp; &nbsp;template&lt;class Archive&gt;<br>

 &nbsp; &nbsp; &nbsp;void serialize(Archive &amp; ar, const unsigned int file_version)<br>

 &nbsp; &nbsp; &nbsp;{<br>

 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(void) file_version;<br>

 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;ar &amp; ptr;<br>

 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;ar &amp; boost::serialization::base_object&lt;derived&gt;(*this);<br>
<br>
 &nbsp; &nbsp; &nbsp;}<br>
<br>
 &nbsp;}; //end of class base<br>
<br>
Version::1.36.0<br>
compliler: g++ 4.1.1....<br>
<br>i am getting a error :<br>
error: forward declaration of &#39;struct fd&#39;<br>
/boost_1_36_0/include/boost-1_36/boost/serialization/access.hpp:109: error: inva<br>
lid use of undefined type &#39;struct<br>
<br>
/project/wipro_virtutech_nobackup/users/niranjan/project_new/boost_1_36_0/include/boost-1_36/boost/serialization/extended_type_info_typeid.hpp:117:
note: neither the destructor nor the class-specific operator delete
will be called, even if they are declared when the class is defined.<br><br><br>