doc/html/boost_asio/reference/yield_context.html


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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.yield_context"></a><a class="link" href="yield_context.html" title="yield_context">yield_context</a>
</h3></div></div></div>
<p>
        <a class="indexterm" name="boost_asio.indexterm.yield_context"></a> 
Context object that represents
        the currently executing coroutine.
      </p>
<pre class="programlisting">typedef basic_yield_context&lt; unspecified &gt; yield_context;
</pre>
<h5>
<a name="boost_asio.reference.yield_context.h0"></a>
        <span class="phrase"><a name="boost_asio.reference.yield_context.types"></a></span><a class="link" href="yield_context.html#boost_asio.reference.yield_context.types">Types</a>
      </h5>
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<colgroup>
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<th>
                <p>
                  Name
                </p>
              </th>
<th>
                <p>
                  Description
                </p>
              </th>
</tr></thead>
<tbody>
<tr>
<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>
</tr>
<tr>
<td>
                <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>
</table></div>
<h5>
<a name="boost_asio.reference.yield_context.h1"></a>
        <span class="phrase"><a name="boost_asio.reference.yield_context.member_functions"></a></span><a class="link" href="yield_context.html#boost_asio.reference.yield_context.member_functions">Member
        Functions</a>
      </h5>
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                  Description
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<td>
                <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>
                <p>
                  Construct a yield context from another yield context type.
                </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>
</table></div>
<p>
        The <a class="link" href="basic_yield_context.html" title="basic_yield_context"><code class="computeroutput">basic_yield_context</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">basic_yield_context</code></a>
        may be passed as a handler to an asynchronous operation. For example:
      </p>
<pre class="programlisting">template &lt;typename Handler&gt;
void my_coroutine(basic_yield_context&lt;Handler&gt; yield)
{
  ...
  std::size_t n = my_socket.async_read_some(buffer, yield);
  ...
}
</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.yield_context.h2"></a>
        <span class="phrase"><a name="boost_asio.reference.yield_context.requirements"></a></span><a class="link" href="yield_context.html#boost_asio.reference.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>None
      </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2018 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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