<div>Hi there! :)</div><div><br></div><div>I've recently become familiar with boost, therefore I'm quite newbie and maybe the answer to my question is trivial.</div><div><br></div><div>Below there is a demonstrative code fragment from a test client application where a server app periodically sends serialized objects to the client. The client reads the socket, re-constructs the serialized object from the stream using boost::archive::text_iarchive and makes some operation on it. Code is very simple and it works fine, however the memory is leaking. I think there is a problem with the usage of text_iarchive because if I comment the appropriate line out, the leaking stops.�Of course the incomingTransferObject (and everything else in the progbam) are destructed properly, they does nothing with the leak.</div>
<div><br></div><div>Here comes the code fragment:</div><div><br></div><div>char buffer[8192]; // class memeber, it contains data received on the socket</div><div><br></div><div>...</div><div><br></div><div><font class="Apple-style-span" color="#3333FF">void Client::handleReadMessage(const boost::system::error_code& error, std::size_t bytes_transferred)</font></div>
<div><font class="Apple-style-span" color="#3333FF">{</font></div><div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">// blah-blah</font></div>
<blockquote class="webkit-indent-blockquote" style="margin: 0 0 0 40px; border: none; padding: 0px;"><div><font class="Apple-style-span" color="#3333FF">...</font></div></blockquote><div><font class="Apple-style-span" color="#3333FF"><br>
</font></div><div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">TransferObject* incomingTransferObject = new TransferObject();</font></div>
<div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">std::istringstream archive_stream(buffer);</font></div>
<div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">boost::archive::text_iarchive archive(archive_stream);</font></div>
<div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><b><font class="Apple-style-span" color="#FF0000">archive >> incomingTransferObject;</font></b></div>
<div><font class="Apple-style-span" color="#3333FF"><br></font></div><div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">//...</font></div>
<div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">// do something with the object</font></div><div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">//...</font></div>
<div><font class="Apple-style-span" color="#3333FF"><br></font></div><div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">delete incomingTransferObject;</font></div>
<div><font class="Apple-style-span" color="#3333FF"><br></font></div><div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">tcpSocket->write_some(boost::asio::buffer("1")); // ack to the server</font></div>
<div><font class="Apple-style-span" color="#3333FF"><br></font></div><div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">boost::asio::async_read(</font></div>
<div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">*tcpSocket,</font></div><div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">boost::asio::buffer(sizeBuffer), boost::asio::transfer_at_least(1),</font></div>
<div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">boost::bind( &Client::handleReadHeader, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)</font></div>
<div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" color="#3333FF"> </font></span><font class="Apple-style-span" color="#3333FF">);</font></div><div><font class="Apple-style-span" color="#3333FF">}</font></div>
<div><br></div><div>The TransferObject is a temporary class just to test serializing more complex objects with stl containers. It looks like this:</div><div><br></div><div><font class="Apple-style-span" color="#3333FF">class TransferObject</font></div>
<div><font class="Apple-style-span" color="#3333FF">{</font></div><div><font class="Apple-style-span" color="#3333FF">�� �friend class boost::serialization::access;</font></div><div><font class="Apple-style-span" color="#3333FF"><br>
</font></div><div><font class="Apple-style-span" color="#3333FF">�� �template<typename Archive></font></div><div><font class="Apple-style-span" color="#3333FF">�� �void serialize(Archive & ar, const unsigned int version)</font></div>
<div><font class="Apple-style-span" color="#3333FF">�� �{</font></div><div><font class="Apple-style-span" color="#3333FF">�� � � �ar & strvector;</font></div><div><font class="Apple-style-span" color="#3333FF">�� � � �ar & strmap;</font></div>
<div><font class="Apple-style-span" color="#3333FF">�� � � �ar & complexSet;</font></div><div><font class="Apple-style-span" color="#3333FF">�� �}</font></div><div><font class="Apple-style-span" color="#3333FF">�� �private:</font></div>
<div><font class="Apple-style-span" color="#3333FF">�� � � �vector<string>* strvector;</font></div><div><font class="Apple-style-span" color="#3333FF">�� � � �map<int,string>* strmap;</font></div><div><font class="Apple-style-span" color="#3333FF">�� � � �set<HelperObject*>* complexSet;</font></div>
<div><font class="Apple-style-span" color="#3333FF">�� �...</font></div><div><font class="Apple-style-span" color="#3333FF">}</font></div><div><font class="Apple-style-span" color="#3333FF"><br></font></div><div><font class="Apple-style-span" color="#3333FF">class HelperObject</font></div>
<div><font class="Apple-style-span" color="#3333FF">{</font></div><div><font class="Apple-style-span" color="#3333FF">�� �friend class boost::serialization::access;</font></div><div><font class="Apple-style-span" color="#3333FF"><br>
</font></div><div><font class="Apple-style-span" color="#3333FF">�� �template<typename Archive></font></div><div><font class="Apple-style-span" color="#3333FF">�� �void serialize(Archive & ar, const unsigned int version)</font></div>
<div><font class="Apple-style-span" color="#3333FF">�� �{</font></div><div><font class="Apple-style-span" color="#3333FF">�� � � �ar & b;</font></div><div><font class="Apple-style-span" color="#3333FF">�� � � �ar & f;</font></div>
<div><font class="Apple-style-span" color="#3333FF">�� �}</font></div><div><font class="Apple-style-span" color="#3333FF"><br></font></div><div><font class="Apple-style-span" color="#3333FF">�� �private:</font></div><div>
<font class="Apple-style-span" color="#3333FF">�� � � �bool b;</font></div><div><font class="Apple-style-span" color="#3333FF">�� � � �float f;</font></div><blockquote class="webkit-indent-blockquote" style="margin: 0 0 0 40px; border: none; padding: 0px;">
<div><font class="Apple-style-span" color="#3333FF">...</font></div></blockquote><div><font class="Apple-style-span" color="#3333FF">}</font></div><div><br></div><div>From my point of view it seems that the text_iarchive makes some memory allocations during its operation but their references are lost after the deserialization which cause the leak, anyway I'm almost absolutely sure that I'm using this technique badly and there is a simple solution for this problem.</div>
<div><br></div><div>Thanks for reading this and I hope an expert can answer. :]</div><div><br></div><div>Laszlo</div>