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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.basic_yield_context"></a><a class="link" href="basic_yield_context.html" title="basic_yield_context">basic_yield_context</a>
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<p>
Context object the represents the currently executing coroutine.
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="Handler.html" title="Handlers">Handler</a><span class="special">></span>
<span class="keyword">class</span> <span class="identifier">basic_yield_context</span>
</pre>
<h5>
<a name="boost_asio.reference.basic_yield_context.h0"></a>
<span class="phrase"><a name="boost_asio.reference.basic_yield_context.types"></a></span><a class="link" href="basic_yield_context.html#boost_asio.reference.basic_yield_context.types">Types</a>
</h5>
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<colgroup>
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<p>
Name
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<th>
<p>
Description
</p>
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<tbody>
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<td>
<p>
<a class="link" href="basic_yield_context/callee_type.html" title="basic_yield_context::callee_type"><span class="bold"><strong>callee_type</strong></span></a>
</p>
</td>
<td>
<p>
The coroutine callee type, used by the implementation.
</p>
</td>
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<p>
<a class="link" href="basic_yield_context/caller_type.html" title="basic_yield_context::caller_type"><span class="bold"><strong>caller_type</strong></span></a>
</p>
</td>
<td>
<p>
The coroutine caller type, used by the implementation.
</p>
</td>
</tr>
</tbody>
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<h5>
<a name="boost_asio.reference.basic_yield_context.h1"></a>
<span class="phrase"><a name="boost_asio.reference.basic_yield_context.member_functions"></a></span><a class="link" href="basic_yield_context.html#boost_asio.reference.basic_yield_context.member_functions">Member
Functions</a>
</h5>
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<p>
<a class="link" href="basic_yield_context/basic_yield_context.html" title="basic_yield_context::basic_yield_context"><span class="bold"><strong>basic_yield_context</strong></span></a>
</p>
</td>
<td>
<p>
Construct a yield context to represent the specified coroutine.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="basic_yield_context/operator_lb__rb_.html" title="basic_yield_context::operator[]"><span class="bold"><strong>operator[]</strong></span></a>
</p>
</td>
<td>
<p>
Return a yield context that sets the specified error_code.
</p>
</td>
</tr>
</tbody>
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<p>
The <a class="link" href="basic_yield_context.html" title="basic_yield_context"><code class="computeroutput"><span class="identifier">basic_yield_context</span></code></a> class is used
to represent the currently executing stackful coroutine. A <a class="link" href="basic_yield_context.html" title="basic_yield_context"><code class="computeroutput"><span class="identifier">basic_yield_context</span></code></a> may be passed
as a handler to an asynchronous operation. For example:
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Handler</span><span class="special">></span>
<span class="keyword">void</span> <span class="identifier">my_coroutine</span><span class="special">(</span><span class="identifier">basic_yield_context</span><span class="special"><</span><span class="identifier">Handler</span><span class="special">></span> <span class="identifier">yield</span><span class="special">)</span>
<span class="special">{</span>
<span class="special">...</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">buffer</span><span class="special">,</span> <span class="identifier">yield</span><span class="special">);</span>
<span class="special">...</span>
<span class="special">}</span>
</pre>
<p>
The initiating function (async_read_some in the above example) suspends the
current coroutine. The coroutine is resumed when the asynchronous operation
completes, and the result of the operation is returned.
</p>
<h5>
<a name="boost_asio.reference.basic_yield_context.h2"></a>
<span class="phrase"><a name="boost_asio.reference.basic_yield_context.requirements"></a></span><a class="link" href="basic_yield_context.html#boost_asio.reference.basic_yield_context.requirements">Requirements</a>
</h5>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/spawn.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
</p>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2013 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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