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265 lines
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<title>any_completion_handler</title>
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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="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.any_completion_handler"></a><a class="link" href="any_completion_handler.html" title="any_completion_handler">any_completion_handler</a>
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</h3></div></div></div>
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<p>
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<a class="indexterm" name="asio.indexterm.any_completion_handler"></a>
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</p>
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<p>
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Polymorphic wrapper for completion handlers.
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</p>
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<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span><span class="special">...</span> <span class="identifier">Signatures</span><span class="special">></span>
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<span class="keyword">class</span> <span class="identifier">any_completion_handler</span>
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</pre>
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<h5>
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<a name="asio.reference.any_completion_handler.h0"></a>
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<span><a name="asio.reference.any_completion_handler.member_functions"></a></span><a class="link" href="any_completion_handler.html#asio.reference.any_completion_handler.member_functions">Member Functions</a>
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</h5>
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<div class="informaltable"><table class="table">
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<colgroup>
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<thead><tr>
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Name
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<p>
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Description
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</p>
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</tr></thead>
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<tbody>
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<a class="link" href="any_completion_handler/any_completion_handler.html" title="any_completion_handler::any_completion_handler"><span class="bold"><strong>any_completion_handler</strong></span></a> <span class="silver">[constructor]</span>
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</p>
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</td>
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<td>
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<p>
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Construct an any_completion_handler in an empty state, without
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a target object. <br> <span class="silver"> —</span><br> Construct an any_completion_handler
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to contain the specified target. <br> <span class="silver"> —</span><br> Move-construct an
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any_completion_handler from another.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<a class="link" href="any_completion_handler/get_allocator.html" title="any_completion_handler::get_allocator"><span class="bold"><strong>get_allocator</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Get the associated allocator.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<a class="link" href="any_completion_handler/get_cancellation_slot.html" title="any_completion_handler::get_cancellation_slot"><span class="bold"><strong>get_cancellation_slot</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Get the associated cancellation slot.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<a class="link" href="any_completion_handler/operator_bool.html" title="any_completion_handler::operator bool"><span class="bold"><strong>operator bool</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Test if the polymorphic wrapper is empty.
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</p>
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</td>
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<tr>
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<p>
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<a class="link" href="any_completion_handler/operator_not_.html" title="any_completion_handler::operator!"><span class="bold"><strong>operator!</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Test if the polymorphic wrapper is non-empty.
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</p>
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</td>
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</tr>
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<tr>
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<p>
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<a class="link" href="any_completion_handler/operator_lp__rp_.html" title="any_completion_handler::operator()"><span class="bold"><strong>operator()</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Function call operator.
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</p>
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</td>
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<td>
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<p>
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<a class="link" href="any_completion_handler/operator_eq_.html" title="any_completion_handler::operator="><span class="bold"><strong>operator=</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Move-assign an any_completion_handler from another. <br> <span class="silver"> —</span><br>
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Assignment operator that sets the polymorphic wrapper to the empty
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state.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<a class="link" href="any_completion_handler/swap.html" title="any_completion_handler::swap"><span class="bold"><strong>swap</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Swap the content of an any_completion_handler with another.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<a class="link" href="any_completion_handler/_any_completion_handler.html" title="any_completion_handler::~any_completion_handler"><span class="bold"><strong>~any_completion_handler</strong></span></a> <span class="silver">[destructor]</span>
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</p>
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</td>
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<td>
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<p>
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Destructor.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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<h5>
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<a name="asio.reference.any_completion_handler.h1"></a>
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<span><a name="asio.reference.any_completion_handler.friends"></a></span><a class="link" href="any_completion_handler.html#asio.reference.any_completion_handler.friends">Friends</a>
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</h5>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Name
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</p>
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</th>
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<th>
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<p>
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Description
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<a class="link" href="any_completion_handler/operator_not__eq_.html" title="any_completion_handler::operator!="><span class="bold"><strong>operator!=</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Inequality operator.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<a class="link" href="any_completion_handler/operator_eq__eq_.html" title="any_completion_handler::operator=="><span class="bold"><strong>operator==</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Equality operator.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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<p>
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The <code class="computeroutput"><span class="identifier">any_completion_handler</span></code>
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class template is a polymorphic wrapper for completion handlers that propagates
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the associated executor, associated allocator, and associated cancellation
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slot through a type-erasing interface.
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</p>
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<p>
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When using <code class="computeroutput"><span class="identifier">any_completion_handler</span></code>,
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specify one or more completion signatures as template parameters. These will
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dictate the arguments that may be passed to the handler through the polymorphic
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interface.
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</p>
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<p>
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Typical uses for <code class="computeroutput"><span class="identifier">any_completion_handler</span></code>
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include:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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Separate compilation of asynchronous operation implementations.
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</li>
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<li class="listitem">
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Enabling interoperability between asynchronous operations and virtual
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functions.
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</li>
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</ul></div>
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<h5>
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<a name="asio.reference.any_completion_handler.h2"></a>
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<span><a name="asio.reference.any_completion_handler.requirements"></a></span><a class="link" href="any_completion_handler.html#asio.reference.any_completion_handler.requirements">Requirements</a>
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</h5>
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<p>
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<span class="emphasis"><em>Header: </em></span><code class="literal">asio/any_completion_handler.hpp</code>
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</p>
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<p>
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<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
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</p>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div>
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<hr>
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<div class="spirit-nav">
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