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<title>Tuple helper classes</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.tuple.class_template_tuple.tuple_helper_classes"></a><a class="link" href="tuple_helper_classes.html" title="Tuple helper classes">Tuple
helper classes</a>
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<h6>
<a name="fusion.tuple.class_template_tuple.tuple_helper_classes.h0"></a>
<span class="phrase"><a name="fusion.tuple.class_template_tuple.tuple_helper_classes.description"></a></span><a class="link" href="tuple_helper_classes.html#fusion.tuple.class_template_tuple.tuple_helper_classes.description">Description</a>
</h6>
<p>
The <a href="http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/2002/n1403.pdf" target="_top">TR1
Tuple</a> provides 2 helper traits, for compile time access to the
tuple size, and the element types.
</p>
<h6>
<a name="fusion.tuple.class_template_tuple.tuple_helper_classes.h1"></a>
<span class="phrase"><a name="fusion.tuple.class_template_tuple.tuple_helper_classes.specification"></a></span><a class="link" href="tuple_helper_classes.html#fusion.tuple.class_template_tuple.tuple_helper_classes.specification">Specification</a>
</h6>
<pre class="programlisting"><span class="identifier">tuple_size</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span>
</pre>
<p>
<span class="bold"><strong>Requires</strong></span>: <code class="computeroutput"><span class="identifier">T</span></code>
is any fusion sequence type, including <code class="computeroutput"><span class="identifier">tuple</span></code>.
</p>
<p>
<span class="bold"><strong>Type</strong></span>: <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>
</p>
<p>
<span class="bold"><strong>Value</strong></span>: The number of elements in the sequence.
Equivalent to <code class="computeroutput"><a class="link" href="../../sequence/intrinsic/metafunctions/size.html" title="size"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></code></a><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span></code>.
</p>
<pre class="programlisting"><span class="identifier">tuple_element</span><span class="special"><</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><strong>Requires</strong></span>: <code class="computeroutput"><span class="identifier">T</span></code>
is any fusion sequence type, including <code class="computeroutput"><span class="identifier">tuple</span></code>.
<code class="computeroutput"><span class="number">0</span> <span class="special"><=</span>
<span class="identifier">I</span> <span class="special"><</span>
<span class="identifier">N</span></code> or the program is ill formed.
</p>
<p>
<span class="bold"><strong>Value</strong></span>: The type of the <code class="computeroutput"><span class="identifier">I</span></code>th
element of <code class="computeroutput"><span class="identifier">T</span></code>. Equivalent
to <code class="computeroutput"><a class="link" href="../../sequence/intrinsic/metafunctions/value_at.html" title="value_at"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span></code></a><span class="special"><</span><span class="identifier">I</span><span class="special">,</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span></code>.
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