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    copied!<p>Found a resolution. I had to export the derived class with the statement:</p> <pre><code>BOOST_CLASS_EXPORT(derived); </code></pre> <p>Posting something that works with some corrections.</p> <pre><code>using namespace std; class base { public: int data1; friend class boost::serialization::access; template&lt;typename Archive&gt; void serialize(Archive &amp; ar, const unsigned int file_version) { ar &amp; data1; } public: base() {}; base(int _d) : data1(_d) {} virtual void foo() const {std::cout &lt;&lt; "base" &lt;&lt; std::endl;} }; class derived : public base { public: int data2; friend class boost::serialization::access; template&lt;typename Archive&gt; void serialize(Archive &amp; ar, const unsigned int file_version) { ar &amp; boost::serialization::base_object&lt;base&gt;(*this); ar &amp; data2; } public: derived() {}; derived(int _b, int _d) : base(_b), data2(_d) {} virtual void foo() const {std::cout &lt;&lt; "derived" &lt;&lt; std::endl;} }; BOOST_CLASS_EXPORT(derived); int main(int argc, char *argv[]) { // client // Assign to base type std::unique_ptr&lt;const base&gt; b1(new derived(1, 2)); std::ostringstream oss; boost::archive::text_oarchive oa(oss); oa &amp; b1.get(); // server // Retrieve derived type from base std::unique_ptr&lt;base&gt; b2; std::istringstream iss(oss.str()); boost::archive::text_iarchive ia(iss); { base *temp; ia &amp; temp; b2.reset(temp); } cout &lt;&lt; b2-&gt;data1 &lt;&lt; endl; cout &lt;&lt; (dynamic_cast&lt;derived*&gt;(b2.get()))-&gt;data2 &lt;&lt; endl; return 0; } </code></pre>
 

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