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POBoost Serialization using polymorphic archives
 

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  1. POBoost Serialization using polymorphic archives
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    <p>I am working on a client-server application that uses boost::serialization library for it's serialization needs. </p> <p>I need to serialize and deserialize polymorphic objects that does not seem to work. The documentation does say that it is supported but none of the related examples demonstrate what I'm trying to do here. So, I am not very sure. My question is can serialize/deserialize polymorphic objects using boost? If yes, what am I doing wrong here? </p> <p>Thanks! </p> <p>code: </p> <pre><code>using namespace std; class base { public: int data1; friend class boost::serialization::access; void serialize(boost::archive::polymorphic_iarchive &amp; ar, const unsigned int file_version) { ar &amp; data1; } void serialize(boost::archive::polymorphic_oarchive &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; void serialize(boost::archive::polymorphic_iarchive &amp; ar, const unsigned int file_version) { ar &amp; boost::serialization::base_object&lt;base&gt;(*this) &amp; data2; } void serialize(boost::archive::polymorphic_oarchive &amp; ar, const unsigned int file_version){ ar &amp; boost::serialization::base_object&lt;base&gt;(*this) &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;} }; int main(int argc, char *argv[]) { // client const base *b1 = new derived(1, 2); std::ostringstream oss; boost::archive::polymorphic_text_oarchive oa(oss); oa &lt;&lt; *b1; // server base *b2 = new derived(3, 4); std::istringstream iss(oss.str()); boost::archive::polymorphic_text_iarchive ia(iss); ia &gt;&gt; *b2; // prints 1, ok cout &lt;&lt; b2-&gt;data1 &lt;&lt; endl; // prints 4, why wasn't the derived class data written? cout &lt;&lt; (dynamic_cast&lt;derived*&gt;(b2))-&gt;data2 &lt;&lt; endl; return 0; } </code></pre>
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    1. USGeorg Fritzsche
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    1. COPlease reformat your code. You need to indent all of it to make it show up as one big block of code.
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      1. USJohn Zwinck
    2. COEven though the background of this is your networking app, the question or subject in itself has nothing to do with networking. Maybe the "network-programming" tag is obsolete?
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      1. USsharkin
 

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