ted in standard C++ ("STL").</p><ul>
<li>If a function/method synchronously reports errors, it will take a (usually optional, defaulting to null) <a class="el" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89" title="Short-hand for flow::Error_code which is very common.">ipc::Error_code</a> (a/k/a <code>boost::system::error_code</code>) <em>pointer</em> argument.<ul>
<li>If it is null: Any error is reported via thrown exception object; through this one can obtain the triggering <code>Error_code E</