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<title>Construction</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.tuple.class_template_tuple.construction"></a><a href="construction.html" title="Construction">Construction</a></h4></div></div></div>
<a name="fusion.tuple.class_template_tuple.construction.description"></a><h5>
<a name="id636788"></a>
<a href="construction.html#fusion.tuple.class_template_tuple.construction.description">Description</a>
</h5>
<p>
The <a href="http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/2002/n1403.pdf" target="_top">TR1
Tuple</a> type provides a default constructor, a constructor that takes
initializers for all of its elements, a copy constructor, and a converting
copy constructor. The details of the various constructors are described
in this section.
</p>
<a name="fusion.tuple.class_template_tuple.construction.specification"></a><h5>
<a name="id636833"></a>
<a href="construction.html#fusion.tuple.class_template_tuple.construction.specification">Specification</a>
</h5>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">T1</span>
<span class="special">...</span> <span class="identifier">TN</span></tt>,
<tt class="computeroutput"><span class="identifier">U1</span> <span class="special">...</span>
<span class="identifier">UN</span></tt></span></dt>
<dd><p>
Tuple element types
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">P1</span>
<span class="special">...</span> <span class="identifier">PN</span></tt></span></dt>
<dd><p>
Parameter types
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">Ti</span></tt>,
<tt class="computeroutput"><span class="identifier">Ui</span></tt></span></dt>
<dd><p>
The type of the <tt class="computeroutput"><span class="identifier">i</span></tt>th
element of a tuple
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">Pi</span></tt></span></dt>
<dd><p>
The type of the <tt class="computeroutput"><span class="identifier">i</span></tt>th
parameter
</p></dd>
</dl>
</div>
<pre class="programlisting">
<span class="identifier">tuple</span><span class="special">();</span>
</pre>
<p>
<span class="bold"><b>Requirements</b></span>: Each <tt class="computeroutput"><span class="identifier">Ti</span></tt>
is default constructable.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Default initializes each element
of the tuple.
</p>
<pre class="programlisting">
<span class="identifier">tuple</span><span class="special">(</span><span class="identifier">P1</span><span class="special">,</span><span class="identifier">P2</span><span class="special">,...,</span><span class="identifier">PN</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Requirements</b></span>: Each <tt class="computeroutput"><span class="identifier">Pi</span></tt>
is <tt class="computeroutput"><span class="identifier">Ti</span></tt> if <tt class="computeroutput"><span class="identifier">Ti</span></tt> is a reference type, <tt class="computeroutput"><span class="keyword">const</span> <span class="identifier">Ti</span><span class="special">&amp;</span></tt> otherwise.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Copy initializes each element
with the corresponding parameter.
</p>
<pre class="programlisting">
<span class="identifier">tuple</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">tuple</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Requirements</b></span>: Each <tt class="computeroutput"><span class="identifier">Ti</span></tt>
should be copy constructable.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Copy constructs each element
of <tt class="computeroutput"><span class="special">*</span><span class="keyword">this</span></tt>
with the corresponding element of <tt class="computeroutput"><span class="identifier">t</span></tt>.
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">U1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">U2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">UN</span><span class="special">&gt;</span>
<span class="identifier">tuple</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">U1</span><span class="special">,</span> <span class="identifier">U2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">UN</span><span class="special">&gt;&amp;</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Requirements</b></span>: Each <tt class="computeroutput"><span class="identifier">Ti</span></tt>
shall be constructible from the corresponding <tt class="computeroutput"><span class="identifier">Ui</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Constructs each element of
<tt class="computeroutput"><span class="special">*</span><span class="keyword">this</span></tt>
with the corresponding element of <tt class="computeroutput"><span class="identifier">t</span></tt>.
</p>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<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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