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copied!<p>As rdbound said, Boost has a "near STL" status. So if you don't <em>need</em> another library, stick to Boost. However, I use <a href="http://pocoproject.org/" rel="noreferrer">POCO</a> because it has some advantages for my situation. The good things about POCO IMO:</p> <ul> <li><p>Better thread library, especially a Active Method implementation. I also like the fact that you can set the thread priority.</p></li> <li><p>More comprehensive network library than <code>boost::asio</code>. However <code>boost::asio</code> is also a very good library.</p></li> <li><p>Includes functionality that is not in Boost, like XML and database interface to name a few. </p></li> <li><p>It is more integrated as one library than Boost.</p></li> <li><p>It has clean, modern and understandable C++ code. I find it far easier to understand than most of the Boost libraries (but I am not a template programming expert :)).</p></li> <li><p>It can be used on a lot of platforms.</p></li> </ul> <p>Some disadvantages of POCO are:</p> <ul> <li><p>It has limited documentation. This somewhat offset by the fact that the source is easy to understand. </p></li> <li><p>It has a far smaller community and user base than, say, Boost. So if you put a question on Stack Overflow for example, your chances of getting an answer are less than for Boost</p></li> <li><p>It remains to be seen how well it will be integrated with the new C++ standard. You know for sure that it will not be a problem for Boost. </p></li> </ul> <p>I never used ACE, so I can't really comment on it. From what I've heard, people find POCO more modern and easier to use than ACE. </p> <p>Some answers to the comments by Rahul:</p> <ol> <li><p>I don't know about versatile and advanced. The POCO thread library provides some functionality that is not in Boost: <code>ActiveMethod</code> and <code>Activity</code>, and <code>ThreadPool</code>. IMO POCO threads are also easier to use and understand, but this is a subjective matter. </p></li> <li><p>POCO network library also provides support for higher level protocols like HTTP and SSL (possibly also in <code>boost::asio</code>, but I am not sure?).</p></li> <li><p>Fair enough.</p></li> <li><p>Integrated library has the advantage of having consistent coding, documentation and general "look and feel". </p></li> <li><p>Being cross-platform is an important feature of POCO, this is not an advantage in relation to Boost. </p></li> </ol> <p>Again, you should probably only consider POCO if it provides some functionality you need and that is not in Boost.</p>

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