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<h1 class="topictitle1">flow::tuple Template Class</h1>
<div>
<p> Some nodes create or use messages that are composites of other
messages. The
<samp class="codeph">flow::tuple</samp> template class is included as part of flow
to support this. The nodes that send or receive tuples are
<span class="keyword">join_node</span>,
<span class="keyword">multifunction_node</span>,
<span class="keyword">split_node</span> and
<span class="keyword">or_node</span> (Community Preview Feature).
</p>
<p> The
<samp class="codeph">tuple</samp> class is part of the C++11 standard, and earlier
implementations of the Standard Library may have a
<samp class="codeph">tuple</samp> class. If
<samp class="codeph">std::tuple</samp> is part of the Standard Library, then
<samp class="codeph">flow::tuple</samp> is typedefed to
<samp class="codeph">std::tuple</samp>.
</p>
<p> If the Standard Library does not contain
<samp class="codeph">tuple</samp>, an implementation is used that supports a subset
of
<samp class="codeph">std::tuple</samp>'s functionality:
<ul type="disc">
<li>construction, copy construction and destruction,
</li>
<li>assignment
</li>
<li><samp class="codeph">get<I>(tuple)</samp> (the i-th element of
<samp class="codeph">tuple</samp>, starting from zero),
</li>
<li><samp class="codeph">tuple_element<I,T>::type</samp> (the type of the i-th
element of tuple type
<samp class="codeph">T</samp>),
</li>
<li><samp class="codeph">tuple_size<T>::value</samp> (the number of elements
of the tuple type
<samp class="codeph">T</samp>),
</li>
</ul>
</p>
<div class="Note"><h3 class="NoteTipHead">
Caution</h3>
<p> Prior releases of <samp class="codeph">flow</samp> injected
<samp class="codeph">flow</samp>'s implementation of <samp class="codeph">tuple</samp> into
the <samp class="codeph">std::</samp> namespace. Users should change
<samp class="codeph">flow</samp>-specific references to <samp class="codeph">std::tuple</samp>
to <samp class="codeph">flow::tuple</samp> to ensure compatibility with compilers
that do not implement
<samp class="codeph">std::tuple</samp> as part of the Standard Library.
</p>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="../../reference/flow_graph.htm">Flow Graph</a></div>
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<div class="See Also">
<h2>See Also</h2>
<div class="linklist">
<div><a href="join_node_cls.htm">join node
</a></div>
<div><a href="multifunc_node_cls.htm">multifunction node
</a></div>
<div><a href="split_node_cls.htm">split node
</a></div>
<div><a href="../appendices/community_preview_features/flow_graph/or_node_cls.htm">or node (Community Preview Feature)
</a></div></div>
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