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<h1>
Traversal <span class="m-thin">module</span></h1>
<p>provides functions to traverse and remap nested packs.</p>
<div class="m-block m-default">
<h3>Contents</h3>
<ul>
<li>
Reference
<ul>
<li><a href="#typedef-members">Typedefs</a></li>
<li><a href="#func-members">Functions</a></li>
</ul>
</li>
</ul>
</div>
<section id="typedef-members">
<h2><a href="#typedef-members">Typedefs</a></h2>
<dl class="m-dox">
<dt>
using <a href="#ga170b41a7aacd94036f9da0af42c6558d" class="m-dox">async_traverse_visit_tag</a> = detail::traversal::async_traverse_visit_tag
</dt>
<dd>A tag which is passed to the <code>operator()</code> of the visitor if an element is visited synchronously through <a href="group___traversal.html#ga02922d0c5bf7a18340069b3500a0cf90" class="m-dox">traverse_<wbr />pack_<wbr />async</a>.</dd>
<dt>
using <a href="#gacc6d0dce8126550436303d433c96b1d7" class="m-dox">async_traverse_detach_tag</a> = detail::traversal::async_traverse_detach_tag
</dt>
<dd>A tag which is passed to the <code>operator()</code> of the visitor if an element is visited after the traversal was detached through <a href="group___traversal.html#ga02922d0c5bf7a18340069b3500a0cf90" class="m-dox">traverse_<wbr />pack_<wbr />async</a>.</dd>
<dt>
using <a href="#ga1c9f6c5ba9ffb68ff36a1f95b78e7d3a" class="m-dox">async_traverse_complete_tag</a> = detail::traversal::async_traverse_complete_tag
</dt>
<dd>A tag which is passed to the <code>operator()</code> of the visitor if the asynchronous pack traversal was finished through <a href="group___traversal.html#ga02922d0c5bf7a18340069b3500a0cf90" class="m-dox">traverse_<wbr />pack_<wbr />async</a>.</dd>
<dt>
<div class="m-dox-template">template&lt;typename T&gt;</div>
using <a href="#gaf67b511265fa74dc4b117cdb1ce9d1e3" class="m-dox">async_traverse_in_place_tag</a> = detail::traversal::async_traverse_in_place_tag&lt;T&gt;
</dt>
<dd>A tag to identify that a mapper shall be constructed in-place from the first argument passed to <a href="group___traversal.html#ga02922d0c5bf7a18340069b3500a0cf90" class="m-dox">traverse_<wbr />pack_<wbr />async</a>.</dd>
</dl>
</section>
<section id="func-members">
<h2><a href="#func-members">Functions</a></h2>
<dl class="m-dox">
<dt>
<div class="m-dox-template">template&lt;typename Visitor, typename... T&gt;</div>
<span class="m-dox-wrap-bumper">auto <a href="#ga02922d0c5bf7a18340069b3500a0cf90" class="m-dox">traverse_pack_async</a>(</span><span class="m-dox-wrap">Visitor&amp;&amp; visitor,
T &amp;&amp; ... pack) -&gt; auto</span>
</dt>
<dd>Traverses the pack with the given visitor in an asynchronous way.</dd>
<dt>
<div class="m-dox-template">template&lt;typename Mapper, typename... T&gt;</div>
<span class="m-dox-wrap-bumper">auto <a href="#gace27f8127eb5eba0f4ab753daacf6a57" class="m-dox">map_pack</a>(</span><span class="m-dox-wrap">Mapper&amp;&amp; mapper,
T &amp;&amp; ... pack) -&gt; decltype(auto)</span>
</dt>
<dd>Maps the pack with the given mapper.</dd>
<dt>
<div class="m-dox-template">template&lt;typename... T&gt;</div>
<span class="m-dox-wrap-bumper">auto <a href="#ga7c14358f4d11803b50ab9687dfcb11c5" class="m-dox">spread_this</a>(</span><span class="m-dox-wrap">T &amp;&amp; ... args) -&gt; detail::traversal::spreading::spread_box&lt;std::decay_t&lt;T&gt;...&gt; <span class="m-label m-flat m-primary">constexpr</span> <span class="m-label m-flat m-success">noexcept(…)</span></span>
</dt>
<dd>Indicate that the result shall be spread across the parent container if possible. This can be used to create a mapper function used in map_pack that maps one element to an arbitrary count (1:n).</dd>
<dt>
<div class="m-dox-template">template&lt;typename Mapper, typename... T&gt;</div>
<span class="m-dox-wrap-bumper">void <a href="#gab497ec8ef4cf8532703fcb9852846a2e" class="m-dox">traverse_pack</a>(</span><span class="m-dox-wrap">Mapper&amp;&amp; mapper,
T &amp;&amp; ... pack)</span>
</dt>
<dd>Traverses the pack with the given visitor.</dd>
</dl>
</section>
<section>
<h2>Typedef documentation</h2>
<section class="m-dox-details" id="ga170b41a7aacd94036f9da0af42c6558d"><div>
<h3>
using <a href="#ga170b41a7aacd94036f9da0af42c6558d" class="m-dox-self">async_traverse_visit_tag</a> = detail::traversal::async_traverse_visit_tag
</h3>
<p>A tag which is passed to the <code>operator()</code> of the visitor if an element is visited synchronously through <a href="group___traversal.html#ga02922d0c5bf7a18340069b3500a0cf90" class="m-dox">traverse_<wbr />pack_<wbr />async</a>.</p>
<aside class="m-note m-default"><h4>Since</h4><p>3.0.0</p></aside>
</div></section>
<section class="m-dox-details" id="gacc6d0dce8126550436303d433c96b1d7"><div>
<h3>
using <a href="#gacc6d0dce8126550436303d433c96b1d7" class="m-dox-self">async_traverse_detach_tag</a> = detail::traversal::async_traverse_detach_tag
</h3>
<p>A tag which is passed to the <code>operator()</code> of the visitor if an element is visited after the traversal was detached through <a href="group___traversal.html#ga02922d0c5bf7a18340069b3500a0cf90" class="m-dox">traverse_<wbr />pack_<wbr />async</a>.</p>
<aside class="m-note m-default"><h4>Since</h4><p>3.0.0</p></aside>
</div></section>
<section class="m-dox-details" id="ga1c9f6c5ba9ffb68ff36a1f95b78e7d3a"><div>
<h3>
using <a href="#ga1c9f6c5ba9ffb68ff36a1f95b78e7d3a" class="m-dox-self">async_traverse_complete_tag</a> = detail::traversal::async_traverse_complete_tag
</h3>
<p>A tag which is passed to the <code>operator()</code> of the visitor if the asynchronous pack traversal was finished through <a href="group___traversal.html#ga02922d0c5bf7a18340069b3500a0cf90" class="m-dox">traverse_<wbr />pack_<wbr />async</a>.</p>
<aside class="m-note m-default"><h4>Since</h4><p>3.0.0</p></aside>
</div></section>
<section class="m-dox-details" id="gaf67b511265fa74dc4b117cdb1ce9d1e3"><div>
<h3>
<div class="m-dox-template">
template&lt;typename T&gt;
</div>
using <a href="#gaf67b511265fa74dc4b117cdb1ce9d1e3" class="m-dox-self">async_traverse_in_place_tag</a> = detail::traversal::async_traverse_in_place_tag&lt;T&gt;
</h3>
<p>A tag to identify that a mapper shall be constructed in-place from the first argument passed to <a href="group___traversal.html#ga02922d0c5bf7a18340069b3500a0cf90" class="m-dox">traverse_<wbr />pack_<wbr />async</a>.</p>
<aside class="m-note m-default"><h4>Since</h4><p>3.0.0</p></aside>
</div></section>
</section>
<section>
<h2>Function documentation</h2>
<section class="m-dox-details" id="ga02922d0c5bf7a18340069b3500a0cf90"><div>
<h3>
<div class="m-dox-template">
template&lt;typename Visitor, typename... T&gt;
</div>
<span class="m-dox-wrap-bumper">auto </span><span class="m-dox-wrap"><span class="m-dox-wrap-bumper"><a href="#ga02922d0c5bf7a18340069b3500a0cf90" class="m-dox-self">traverse_pack_async</a>(</span><span class="m-dox-wrap">Visitor&amp;&amp; visitor,
T &amp;&amp; ... pack)</span></span>
</h3>
<p>Traverses the pack with the given visitor in an asynchronous way.</p>
<table class="m-table m-fullwidth m-flat">
<thead>
<tr><th colspan="2">Parameters</th></tr>
</thead>
<tbody>
<tr>
<td style="width: 1%">visitor</td>
<td>A visitor object which provides the three <code>operator()</code> overloads that were described above. Additionally the visitor must be compatible for referencing it from a <code>boost::intrusive_ptr</code>. The visitor should must have a virtual destructor!</td>
</tr>
<tr>
<td>pack</td>
<td>The arbitrary parameter pack which is traversed asynchronously. Nested objects inside containers and tuple like types are traversed recursively.</td>
</tr>
</tbody>
<tfoot>
<tr>
<th>Returns</th>
<td>A std::shared_ptr that references an instance of the given visitor object.</td>
</tr>
</tfoot>
</table>
<p>This function works in the same way as <code>traverse_pack</code>, however, we are able to suspend and continue the traversal at later time. Thus we require a visitor callable object which provides three <code>operator()</code> overloads as depicted by the code sample below:</p><pre class="m-code"><span class="k">struct</span> <span class="n">my_async_visitor</span> <span class="p">{</span>
<span class="k">template</span> <span class="o">&lt;</span><span class="k">typename</span> <span class="n">T</span><span class="o">&gt;</span>
<span class="kt">bool</span> <span class="k">operator</span><span class="p">()(</span><span class="n">async_traverse_visit_tag</span><span class="p">,</span> <span class="n">T</span><span class="o">&amp;&amp;</span> <span class="n">element</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="nb">true</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">template</span> <span class="o">&lt;</span><span class="k">typename</span> <span class="n">T</span><span class="p">,</span> <span class="k">typename</span> <span class="n">N</span><span class="o">&gt;</span>
<span class="kt">void</span> <span class="k">operator</span><span class="p">()(</span><span class="n">async_traverse_detach_tag</span><span class="p">,</span> <span class="n">T</span><span class="o">&amp;&amp;</span> <span class="n">element</span><span class="p">,</span> <span class="n">N</span><span class="o">&amp;&amp;</span> <span class="n">next</span><span class="p">)</span> <span class="p">{</span>
<span class="p">}</span>
<span class="k">template</span> <span class="o">&lt;</span><span class="k">typename</span> <span class="n">T</span><span class="o">&gt;</span>
<span class="kt">void</span> <span class="k">operator</span><span class="p">()(</span><span class="n">async_traverse_complete_tag</span><span class="p">,</span> <span class="n">T</span><span class="o">&amp;&amp;</span> <span class="n">pack</span><span class="p">)</span> <span class="p">{</span>
<span class="p">}</span>
<span class="p">};</span></pre><aside class="m-note m-default"><h4>Since</h4><p>3.0.0</p></aside><p>See <code>traverse_pack</code> for a detailed description about the traversal behaviour and capabilities.</p>
</div></section>
<section class="m-dox-details" id="gace27f8127eb5eba0f4ab753daacf6a57"><div>
<h3>
<div class="m-dox-template">
template&lt;typename Mapper, typename... T&gt;
</div>
<span class="m-dox-wrap-bumper">decltype(auto) </span><span class="m-dox-wrap"><span class="m-dox-wrap-bumper"><a href="#gace27f8127eb5eba0f4ab753daacf6a57" class="m-dox-self">map_pack</a>(</span><span class="m-dox-wrap">Mapper&amp;&amp; mapper,
T &amp;&amp; ... pack)</span></span>
</h3>
<p>Maps the pack with the given mapper.</p>
<table class="m-table m-fullwidth m-flat">
<thead>
<tr><th colspan="2">Parameters</th></tr>
</thead>
<tbody>
<tr>
<td style="width: 1%">mapper</td>
<td>A callable object, which accept an arbitrary type and maps it to another type or the same one.</td>
</tr>
<tr>
<td>pack</td>
<td>An arbitrary variadic pack which may contain any type.</td>
</tr>
</tbody>
<thead>
<tr>
<th>Returns</th>
<td>The mapped element or in case the pack contains multiple elements, the pack is wrapped into a <code>std::tuple</code>.</td>
</tr>
</thead>
<thead>
<tr><th colspan="2">Exceptions</th></tr>
</thead>
<tbody>
<tr>
<td>std::exception</td>
<td>like objects which are thrown by an invocation to the mapper.</td>
</tr>
</tbody>
</table>
<p>This function tries to visit all plain elements which may be wrapped in:</p><ul><li>homogeneous containers (<code>std::vector</code>, <code>std::list</code>)</li><li>heterogenous containers <code>(std::tuple</code>, <code>std::pair</code>, <code>std::array</code>) and re-assembles the pack with the result of the mapper. Mapping from one type to a different one is supported.</li></ul><p>Elements that aren&#x27;t accepted by the mapper are routed through and preserved through the hierarchy.</p><pre class="m-code"><span class="c1">// Maps all integers to floats</span>
<span class="n">map_pack</span><span class="p">([](</span><span class="kt">int</span> <span class="n">value</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="kt">float</span><span class="p">(</span><span class="n">value</span><span class="p">);</span>
<span class="p">},</span>
<span class="mi">1</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">make_tuple</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span><span class="p">{</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">}),</span> <span class="mi">5</span><span class="p">);</span></pre><aside class="m-note m-default"><h4>Since</h4><p>3.0.0</p></aside>
</div></section>
<section class="m-dox-details" id="ga7c14358f4d11803b50ab9687dfcb11c5"><div>
<h3>
<div class="m-dox-template">
template&lt;typename... T&gt;
</div>
<span class="m-dox-wrap-bumper">detail::traversal::spreading::spread_box&lt;std::decay_t&lt;T&gt;...&gt; </span><span class="m-dox-wrap"><span class="m-dox-wrap-bumper"><a href="#ga7c14358f4d11803b50ab9687dfcb11c5" class="m-dox-self">spread_this</a>(</span><span class="m-dox-wrap">T &amp;&amp; ... args) <span class="m-label m-primary">constexpr</span> <span class="m-label m-success">noexcept(…)</span></span></span>
</h3>
<p>Indicate that the result shall be spread across the parent container if possible. This can be used to create a mapper function used in map_pack that maps one element to an arbitrary count (1:n).</p>
<aside class="m-note m-default"><h4>Since</h4><p>3.0.0</p></aside>
</div></section>
<section class="m-dox-details" id="gab497ec8ef4cf8532703fcb9852846a2e"><div>
<h3>
<div class="m-dox-template">
template&lt;typename Mapper, typename... T&gt;
</div>
<span class="m-dox-wrap-bumper">void </span><span class="m-dox-wrap"><span class="m-dox-wrap-bumper"><a href="#gab497ec8ef4cf8532703fcb9852846a2e" class="m-dox-self">traverse_pack</a>(</span><span class="m-dox-wrap">Mapper&amp;&amp; mapper,
T &amp;&amp; ... pack)</span></span>
</h3>
<p>Traverses the pack with the given visitor.</p>
<p>This function works in the same way as <code>map_pack</code>, however, the result of the mapper isn&#x27;t preserved.</p><p>See <code>map_pack</code> for a detailed description.</p><aside class="m-note m-default"><h4>Since</h4><p>3.0.0</p></aside>
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