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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="boost_asio.reference.basic_deadline_timer.async_wait"></a><a class="link" href="async_wait.html" title="basic_deadline_timer::async_wait">basic_deadline_timer::async_wait</a> |
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| <p> |
| <a class="indexterm" name="id931999"></a> |
| Start an asynchronous wait on the timer. |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> |
| <span class="keyword">typename</span> <a class="link" href="../WaitHandler.html" title="Wait handler requirements">WaitHandler</a><span class="special">></span> |
| <span class="keyword">void</span> <span class="identifier">async_wait</span><span class="special">(</span> |
| <span class="identifier">WaitHandler</span> <span class="identifier">handler</span><span class="special">);</span> |
| </pre> |
| <p> |
| This function may be used to initiate an asynchronous wait against the |
| timer. It always returns immediately. |
| </p> |
| <p> |
| For each call to <code class="computeroutput"><span class="identifier">async_wait</span><span class="special">()</span></code>, the supplied handler will be called |
| exactly once. The handler will be called when: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| The timer has expired. |
| </li> |
| <li class="listitem"> |
| The timer was cancelled, in which case the handler is passed the error |
| code <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error</span><span class="special">::</span><span class="identifier">operation_aborted</span></code>. |
| </li> |
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| <a name="boost_asio.reference.basic_deadline_timer.async_wait.parameters"></a><h6> |
| <a name="id932164"></a> |
| <a class="link" href="async_wait.html#boost_asio.reference.basic_deadline_timer.async_wait.parameters">Parameters</a> |
| </h6> |
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| <p class="title"><b></b></p> |
| <dl> |
| <dt><span class="term">handler</span></dt> |
| <dd> |
| <p> |
| The handler to be called when the timer expires. Copies will be made |
| of the handler as required. The function signature of the handler |
| must be: |
| </p> |
| <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span> |
| <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&</span> <span class="identifier">error</span> <span class="comment">// Result of operation. |
| </span><span class="special">);</span> |
| </pre> |
| <p> |
| Regardless of whether the asynchronous operation completes immediately |
| or not, the handler will not be invoked from within this function. |
| Invocation of the handler will be performed in a manner equivalent |
| to using <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_service</span><span class="special">::</span><span class="identifier">post</span><span class="special">()</span></code>. |
| </p> |
| </dd> |
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| <td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 Christopher M. Kohlhoff<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
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