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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_asio.reference.asynchronous_operations.execution_of_completion_handler_on_completion_of_asynchronous_operation"></a><a class="link" href="execution_of_completion_handler_on_completion_of_asynchronous_operation.html" title="Execution of completion handler on completion of asynchronous operation">Execution
        of completion handler on completion of asynchronous operation</a>
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<p>
          Let <code class="computeroutput">Args...</code> be the argument types of the completion signature
          <code class="computeroutput">Signature</code> and let <code class="literal"><span class="emphasis"><em>N</em></span></code>
          be <code class="computeroutput">sizeof...(Args)</code>. Let <code class="literal"><span class="emphasis"><em>i</em></span></code>
          be in the range [<code class="computeroutput">0</code>,<code class="literal"><span class="emphasis"><em>N</em></span></code>).
          Let <code class="literal">T[sub <span class="emphasis"><em>i</em></span></code>] be the <code class="literal"><span class="emphasis"><em>i</em></span></code>th
          type in <code class="computeroutput">Args...</code> and let <code class="literal">t[sub <span class="emphasis"><em>i</em></span></code>]
          be the <code class="literal"><span class="emphasis"><em>i</em></span></code>th completion handler argument
          associated with <code class="literal">T[sub <span class="emphasis"><em>i</em></span></code>].
        </p>
<p>
          Let <code class="computeroutput">f</code> be a function object, callable as <code class="computeroutput">f()</code>,
          that invokes <code class="computeroutput">completion_handler</code> as if by <code class="literal">completion_handler(forward&lt;T[sub
          <span class="emphasis"><em>0</em></span></code>&gt;(t[sub <span class="emphasis"><em>0</em></span>]), ...,
          forward&lt;T[sub <span class="emphasis"><em>N-1</em></span>]&gt;(t[sub <span class="emphasis"><em>N-1</em></span>]))].
        </p>
<p>
          If an asynchonous operation completes immediately (that is, within the
          thread of execution calling the initiating function, and before the initiating
          function returns), the completion handler shall be submitted for execution
          as if by performing <code class="computeroutput">ex2.post(std::move(f), alloc2)</code>. Otherwise,
          the completion handler shall be submitted for execution as if by performing
          <code class="computeroutput">ex2.dispatch(std::move(f), alloc2)</code>.
        </p>
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