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2023-10-24 21:59:30 -04:00
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<div class="titlepage"><div><div><h3 class="title">
<a name="asio.reference.co_spawn"></a><a class="link" href="co_spawn.html" title="co_spawn">co_spawn</a>
</h3></div></div></div>
<p>
<a class="indexterm" name="asio.indexterm.co_spawn"></a>
</p>
<p>
Spawn a new coroutined-based thread of execution.
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <a class="link" href="Executor1.html" title="Executor requirements">Executor</a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="Executor1.html" title="Executor requirements">AwaitableExecutor</a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">CompletionToken</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">&gt;</span>
<a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="co_spawn/overload1.html" title="co_spawn (1 of 6 overloads)">co_spawn</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">Executor</span> <span class="special">&amp;</span> <span class="identifier">ex</span><span class="special">,</span>
<span class="identifier">awaitable</span><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">AwaitableExecutor</span> <span class="special">&gt;</span> <span class="identifier">a</span><span class="special">,</span>
<span class="identifier">CompletionToken</span> <span class="special">&amp;&amp;</span> <span class="identifier">token</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special">&lt;</span> <span class="special">(</span><span class="identifier">is_executor</span><span class="special">&lt;</span> <span class="identifier">Executor</span> <span class="special">&gt;::</span><span class="identifier">value</span><span class="special">||</span><span class="identifier">execution</span><span class="special">::</span><span class="identifier">is_executor</span><span class="special">&lt;</span> <span class="identifier">Executor</span> <span class="special">&gt;::</span><span class="identifier">value</span><span class="special">)&amp;&amp;</span><span class="identifier">is_convertible</span><span class="special">&lt;</span> <span class="identifier">Executor</span><span class="special">,</span> <span class="identifier">AwaitableExecutor</span> <span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">&gt;::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="co_spawn/overload1.html" title="co_spawn (1 of 6 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <a class="link" href="Executor1.html" title="Executor requirements">Executor</a><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="Executor1.html" title="Executor requirements">AwaitableExecutor</a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">CompletionToken</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">&gt;</span>
<a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="co_spawn/overload2.html" title="co_spawn (2 of 6 overloads)">co_spawn</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">Executor</span> <span class="special">&amp;</span> <span class="identifier">ex</span><span class="special">,</span>
<span class="identifier">awaitable</span><span class="special">&lt;</span> <span class="keyword">void</span><span class="special">,</span> <span class="identifier">AwaitableExecutor</span> <span class="special">&gt;</span> <span class="identifier">a</span><span class="special">,</span>
<span class="identifier">CompletionToken</span> <span class="special">&amp;&amp;</span> <span class="identifier">token</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special">&lt;</span> <span class="special">(</span><span class="identifier">is_executor</span><span class="special">&lt;</span> <span class="identifier">Executor</span> <span class="special">&gt;::</span><span class="identifier">value</span><span class="special">||</span><span class="identifier">execution</span><span class="special">::</span><span class="identifier">is_executor</span><span class="special">&lt;</span> <span class="identifier">Executor</span> <span class="special">&gt;::</span><span class="identifier">value</span><span class="special">)&amp;&amp;</span><span class="identifier">is_convertible</span><span class="special">&lt;</span> <span class="identifier">Executor</span><span class="special">,</span> <span class="identifier">AwaitableExecutor</span> <span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">&gt;::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="co_spawn/overload2.html" title="co_spawn (2 of 6 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">ExecutionContext</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="Executor1.html" title="Executor requirements">AwaitableExecutor</a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">CompletionToken</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">&gt;</span>
<a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="co_spawn/overload3.html" title="co_spawn (3 of 6 overloads)">co_spawn</a><span class="special">(</span>
<span class="identifier">ExecutionContext</span> <span class="special">&amp;</span> <span class="identifier">ctx</span><span class="special">,</span>
<span class="identifier">awaitable</span><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">AwaitableExecutor</span> <span class="special">&gt;</span> <span class="identifier">a</span><span class="special">,</span>
<span class="identifier">CompletionToken</span> <span class="special">&amp;&amp;</span> <span class="identifier">token</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special">&lt;</span> <span class="identifier">is_convertible</span><span class="special">&lt;</span> <span class="identifier">ExecutionContext</span> <span class="special">&amp;,</span> <span class="identifier">execution_context</span> <span class="special">&amp;</span> <span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">&amp;&amp;</span><span class="identifier">is_convertible</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">ExecutionContext</span><span class="special">::</span><span class="identifier">executor_type</span><span class="special">,</span> <span class="identifier">AwaitableExecutor</span> <span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">&gt;::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="co_spawn/overload3.html" title="co_spawn (3 of 6 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">ExecutionContext</span><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="Executor1.html" title="Executor requirements">AwaitableExecutor</a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">CompletionToken</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">&gt;</span>
<a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="co_spawn/overload4.html" title="co_spawn (4 of 6 overloads)">co_spawn</a><span class="special">(</span>
<span class="identifier">ExecutionContext</span> <span class="special">&amp;</span> <span class="identifier">ctx</span><span class="special">,</span>
<span class="identifier">awaitable</span><span class="special">&lt;</span> <span class="keyword">void</span><span class="special">,</span> <span class="identifier">AwaitableExecutor</span> <span class="special">&gt;</span> <span class="identifier">a</span><span class="special">,</span>
<span class="identifier">CompletionToken</span> <span class="special">&amp;&amp;</span> <span class="identifier">token</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special">&lt;</span> <span class="identifier">is_convertible</span><span class="special">&lt;</span> <span class="identifier">ExecutionContext</span> <span class="special">&amp;,</span> <span class="identifier">execution_context</span> <span class="special">&amp;</span> <span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">&amp;&amp;</span><span class="identifier">is_convertible</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">ExecutionContext</span><span class="special">::</span><span class="identifier">executor_type</span><span class="special">,</span> <span class="identifier">AwaitableExecutor</span> <span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">&gt;::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="co_spawn/overload4.html" title="co_spawn (4 of 6 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <a class="link" href="Executor1.html" title="Executor requirements">Executor</a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">CompletionToken</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">&gt;</span>
<a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="co_spawn/overload5.html" title="co_spawn (5 of 6 overloads)">co_spawn</a><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">Executor</span> <span class="special">&amp;</span> <span class="identifier">ex</span><span class="special">,</span>
<span class="identifier">F</span> <span class="special">&amp;&amp;</span> <span class="identifier">f</span><span class="special">,</span>
<span class="identifier">CompletionToken</span> <span class="special">&amp;&amp;</span> <span class="identifier">token</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special">&lt;</span> <span class="identifier">is_executor</span><span class="special">&lt;</span> <span class="identifier">Executor</span> <span class="special">&gt;::</span><span class="identifier">value</span><span class="special">||</span><span class="identifier">execution</span><span class="special">::</span><span class="identifier">is_executor</span><span class="special">&lt;</span> <span class="identifier">Executor</span> <span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">&gt;::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="co_spawn/overload5.html" title="co_spawn (5 of 6 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">ExecutionContext</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">CompletionToken</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">&gt;</span>
<a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="co_spawn/overload6.html" title="co_spawn (6 of 6 overloads)">co_spawn</a><span class="special">(</span>
<span class="identifier">ExecutionContext</span> <span class="special">&amp;</span> <span class="identifier">ctx</span><span class="special">,</span>
<span class="identifier">F</span> <span class="special">&amp;&amp;</span> <span class="identifier">f</span><span class="special">,</span>
<span class="identifier">CompletionToken</span> <span class="special">&amp;&amp;</span> <span class="identifier">token</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special">&lt;</span> <span class="identifier">is_convertible</span><span class="special">&lt;</span> <span class="identifier">ExecutionContext</span> <span class="special">&amp;,</span> <span class="identifier">execution_context</span> <span class="special">&amp;</span> <span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">&gt;::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="co_spawn/overload6.html" title="co_spawn (6 of 6 overloads)">more...</a></em></span>
</pre>
<h5>
<a name="asio.reference.co_spawn.h0"></a>
<span><a name="asio.reference.co_spawn.requirements"></a></span><a class="link" href="co_spawn.html#asio.reference.co_spawn.requirements">Requirements</a>
</h5>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">asio/co_spawn.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
</p>
</div>
<div class="copyright-footer">Copyright © 2003-2023 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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