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POsimple callback control using boost::asio and c++11 lambda
 

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    <p>I'm implementing simple server with <code>boost::asio</code> and thinking of io-service-per-cpu model(each io_service has one thread).</p> <p>What i want to do is, let an io_service to request some jobs to another io_service( something like message passing ).</p> <p>I think <code>boost::asio::io_service::post</code> can help me.</p> <p>There are two <code>io_service</code>s, <code>ios1</code>,<code>ios2</code>, </p> <p>and a job(function) <code>bool func(arg *)</code>,</p> <p>and a completion handler <code>void callback(bool)</code>.</p> <p>So I want <code>ios1</code> to request a job, <code>ios2</code> runs it and notify <code>ios1</code> to finish and finally <code>ios2</code> runs the handler.</p> <pre><code>ios2.post( [&amp;ios1, arg_ptr, callback, func] { bool result = func(arg_ptr); ios1.post( []{ callback(result) } ); } ); </code></pre> <p>Is this code works? and is there any smarter and simpler way?</p> <p><strong>EDIT:</strong></p> <p>I found that the second lamda inside the <code>ios1.post()</code> can't reach the function pointer <code>callback</code>. It's out of the scope... so I'm trying another way using <code>boost::bind()</code>.</p> <pre><code>ios2.post( [&amp;ios1, arg_ptr, callback, func] { ios1.post( boost::bind( callback, func(arg_ptr) ) ); } ); </code></pre> <p>I removed one stack variable bool and it seems better.</p> <p>But using c++11 lambda and <code>boost::bind</code> together doesn't look so cool.</p> <p>How can i do this without <code>boost::bind</code>?</p>
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