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<html>
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<title>Construction</title>
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<div class="section" lang="en">
<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="id633034"></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="id633075"></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>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 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>)
</p>
</div></td>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.tuple.class_template_tuple.element_access"></a><a href="element_access.html" title="Element
access">Element
access</a></h4></div></div></div>
<a name="fusion.tuple.class_template_tuple.element_access.description"></a><h5>
<a name="id635029"></a>
<a href="element_access.html#fusion.tuple.class_template_tuple.element_access.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> provides the <tt class="computeroutput"><span class="identifier">get</span></tt>
function to provide access to it's elements by zero based numeric index.
</p>
<a name="fusion.tuple.class_template_tuple.element_access.specification"></a><h5>
<a name="id635078"></a>
<a href="element_access.html#fusion.tuple.class_template_tuple.element_access.specification">Specification</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">int</span> <span class="identifier">I</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="identifier">RJ</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">T</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Requires</b></span>: <tt class="computeroutput"><span class="number">0</span>
<span class="special">&lt;</span> <span class="identifier">I</span>
<span class="special">&lt;=</span> <span class="identifier">N</span></tt>.
The program is ill formed if <tt class="computeroutput"><span class="identifier">I</span></tt>
is out of bounds. <tt class="computeroutput"><span class="identifier">T</span></tt> is
any fusion sequence type, including <tt class="computeroutput"><span class="identifier">tuple</span></tt>.
</p>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="identifier">RJ</span></tt>
is equivalent to <tt class="computeroutput"><a href="../../sequence/intrinsic/metafunctions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_c</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>.
</p>
<p>
<span class="bold"><b>Returns</b></span>: A reference to the <tt class="computeroutput"><span class="identifier">I</span></tt>th 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">int</span> <span class="identifier">I</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="identifier">PJ</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Requires</b></span>: <tt class="computeroutput"><span class="number">0</span>
<span class="special">&lt;</span> <span class="identifier">I</span>
<span class="special">&lt;=</span> <span class="identifier">N</span></tt>.
The program is ill formed if <tt class="computeroutput"><span class="identifier">I</span></tt>
is out of bounds. <tt class="computeroutput"><span class="identifier">T</span></tt> is
any fusion sequence type, including <tt class="computeroutput"><span class="identifier">tuple</span></tt>.
</p>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="identifier">PJ</span></tt>
is equivalent to <tt class="computeroutput"><a href="../../sequence/intrinsic/metafunctions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_c</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>.
</p>
<p>
<span class="bold"><b>Returns</b></span>: A const reference to the <tt class="computeroutput"><span class="identifier">I</span></tt>th element of <tt class="computeroutput"><span class="identifier">T</span></tt>.
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 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>)
</p>
</div></td>
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<a name="fusion.tuple.class_template_tuple.relational_operators.description"></a><h5>
<a name="id635696"></a>
<a href="relational_operators.html#fusion.tuple.class_template_tuple.relational_operators.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> provides the standard boolean relational operators.
</p>
<a name="fusion.tuple.class_template_tuple.relational_operators.specification"></a><h5>
<a name="id635734"></a>
<a href="relational_operators.html#fusion.tuple.class_template_tuple.relational_operators.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="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">TN</span><span class="special">,</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="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span>
<span class="keyword">const</span> <span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">TN</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</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">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Requirements</b></span>: For all <tt class="computeroutput"><span class="identifier">i</span></tt>,
<tt class="computeroutput"><span class="number">1</span> <span class="special">&lt;=</span>
<span class="identifier">i</span> <span class="special">&lt;</span>
<span class="identifier">N</span></tt>, <tt class="computeroutput"><a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">lhs</span><span class="special">)</span> <span class="special">==</span> <a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">rhs</span><span class="special">)</span></tt>
is a valid expression returning a type that is convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns <tt class="computeroutput"><span class="keyword">true</span></tt>
if and only if <tt class="computeroutput"><a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">lhs</span><span class="special">)</span> <span class="special">==</span> <a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">rhs</span><span class="special">)</span></tt>
for all <tt class="computeroutput"><span class="identifier">i</span></tt>. For any 2 zero
length tuples <tt class="computeroutput"><span class="identifier">e</span></tt> and <tt class="computeroutput"><span class="identifier">f</span></tt>, <tt class="computeroutput"><span class="identifier">e</span>
<span class="special">==</span> <span class="identifier">f</span></tt>
returns <tt class="computeroutput"><span class="keyword">true</span></tt>.
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">TN</span><span class="special">,</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="keyword">bool</span> <span class="keyword">operator</span><span class="special">&lt;(</span>
<span class="keyword">const</span> <span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">TN</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</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">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Requirements</b></span>: For all <tt class="computeroutput"><span class="identifier">i</span></tt>,
<tt class="computeroutput"><span class="number">1</span> <span class="special">&lt;=</span>
<span class="identifier">i</span> <span class="special">&lt;</span>
<span class="identifier">N</span></tt>, <tt class="computeroutput"><a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">lhs</span><span class="special">)</span> <span class="special">&lt;</span> <a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">rhs</span><span class="special">)</span></tt>
is a valid expression returning a type that is convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the lexicographical
comparison of between <tt class="computeroutput"><span class="identifier">lhs</span></tt>
and <tt class="computeroutput"><span class="identifier">rhs</span></tt>.
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">TN</span><span class="special">,</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="keyword">bool</span> <span class="keyword">operator</span><span class="special">!=(</span>
<span class="keyword">const</span> <span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">TN</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</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">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Requirements</b></span>: For all <tt class="computeroutput"><span class="identifier">i</span></tt>,
<tt class="computeroutput"><span class="number">1</span> <span class="special">&lt;=</span>
<span class="identifier">i</span> <span class="special">&lt;</span>
<span class="identifier">N</span></tt>, <tt class="computeroutput"><a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">lhs</span><span class="special">)</span> <span class="special">==</span> <a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">rhs</span><span class="special">)</span></tt>
is a valid expression returning a type that is convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns <tt class="computeroutput"><span class="special">!(</span><span class="identifier">lhs</span> <span class="special">==</span> <span class="identifier">rhs</span><span class="special">)</span></tt>.
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">TN</span><span class="special">,</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="keyword">bool</span> <span class="keyword">operator</span><span class="special">&lt;=(</span>
<span class="keyword">const</span> <span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">TN</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</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">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Requirements</b></span>: For all <tt class="computeroutput"><span class="identifier">i</span></tt>,
<tt class="computeroutput"><span class="number">1</span> <span class="special">&lt;=</span>
<span class="identifier">i</span> <span class="special">&lt;</span>
<span class="identifier">N</span></tt>, <tt class="computeroutput"><a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">rhs</span><span class="special">)</span> <span class="special">&lt;</span> <a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">lhs</span><span class="special">)</span></tt>
is a valid expression returning a type that is convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns <tt class="computeroutput"><span class="special">!(</span><span class="identifier">rhs</span> <span class="special">&lt;</span> <span class="identifier">lhs</span><span class="special">)</span></tt>
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">TN</span><span class="special">,</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="keyword">bool</span> <span class="keyword">operator</span><span class="special">&gt;(</span>
<span class="keyword">const</span> <span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">TN</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</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">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Requirements</b></span>: For all <tt class="computeroutput"><span class="identifier">i</span></tt>,
<tt class="computeroutput"><span class="number">1</span> <span class="special">&lt;=</span>
<span class="identifier">i</span> <span class="special">&lt;</span>
<span class="identifier">N</span></tt>, <tt class="computeroutput"><a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">rhs</span><span class="special">)</span> <span class="special">&lt;</span> <a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">lhs</span><span class="special">)</span></tt>
is a valid expression returning a type that is convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns <tt class="computeroutput"><span class="identifier">rhs</span>
<span class="special">&lt;</span> <span class="identifier">lhs</span></tt>.
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">TN</span><span class="special">,</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="keyword">bool</span> <span class="keyword">operator</span><span class="special">&gt;=(</span>
<span class="keyword">const</span> <span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">TN</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</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">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Requirements</b></span>: For all <tt class="computeroutput"><span class="identifier">i</span></tt>,
<tt class="computeroutput"><span class="number">1</span> <span class="special">&lt;=</span>
<span class="identifier">i</span> <span class="special">&lt;</span>
<span class="identifier">N</span></tt>, <tt class="computeroutput"><a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">lhs</span><span class="special">)</span> <span class="special">&lt;</span> <a href="element_access.html" title="Element
access"><tt class="computeroutput"><span class="identifier">get</span></tt></a><span class="special">&lt;</span><span class="identifier">i</span><span class="special">&gt;(</span><span class="identifier">rhs</span><span class="special">)</span></tt>
is a valid expression returning a type that is convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns <tt class="computeroutput"><span class="special">!(</span><span class="identifier">lhs</span> <span class="special">&lt;</span> <span class="identifier">rhs</span><span class="special">)</span></tt>.
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 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>)
</p>
</div></td>
</tr></table>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.tuple.class_template_tuple.tuple_creation_functions"></a><a href="tuple_creation_functions.html" title="Tuple
creation functions">Tuple
creation functions</a></h4></div></div></div>
<a name="fusion.tuple.class_template_tuple.tuple_creation_functions.description"></a><h5>
<a name="id633808"></a>
<a href="tuple_creation_functions.html#fusion.tuple.class_template_tuple.tuple_creation_functions.description">Description</a>
</h5>
<p>
TR1 describes 2 utility functions for creating <span class="underline">_tr1</span><span class="underline">tuple</span>_s. <tt class="computeroutput"><span class="identifier">make_tuple</span></tt>
builds a tuple out of it's argument list, and <tt class="computeroutput"><span class="identifier">tie</span></tt>
builds a tuple of references to it's arguments. The details of these creation
functions are described in this section.
</p>
<a name="fusion.tuple.class_template_tuple.tuple_creation_functions.specification"></a><h5>
<a name="id633879"></a>
<a href="tuple_creation_functions.html#fusion.tuple.class_template_tuple.tuple_creation_functions.specification">Specification</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">TN</span><span class="special">&gt;</span>
<span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">V1</span><span class="special">,</span> <span class="identifier">V2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">VN</span><span class="special">&gt;</span> <span class="identifier">make_tuple</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">T1</span><span class="special">&amp;</span> <span class="identifier">t1</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">T2</span><span class="special">&amp;</span> <span class="identifier">t2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">const</span> <span class="identifier">TN</span><span class="special">&amp;</span> <span class="identifier">tn</span><span class="special">);</span>
</pre>
<p>
Where <tt class="computeroutput"><span class="identifier">Vi</span></tt> is <tt class="computeroutput"><span class="identifier">X</span><span class="special">&amp;</span></tt>
if the cv-unqualified type <tt class="computeroutput"><span class="identifier">Ti</span></tt>
is <tt class="computeroutput"><span class="identifier">reference_wrapper</span><span class="special">&lt;</span><span class="identifier">X</span><span class="special">&gt;</span></tt>,
otherwise <tt class="computeroutput"><span class="identifier">Vi</span></tt> is <tt class="computeroutput"><span class="identifier">Ti</span></tt>.
</p>
<p>
<span class="bold"><b>Returns</b></span>: <tt class="computeroutput"><span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">V1</span><span class="special">,</span> <span class="identifier">V2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">VN</span><span class="special">&gt;(</span><span class="identifier">t1</span><span class="special">,</span> <span class="identifier">t2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">tN</span><span class="special">)</span></tt>
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">TN</span><span class="special">&gt;</span>
<span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">&amp;,</span> <span class="identifier">T2</span><span class="special">&amp;,</span> <span class="special">...,</span> <span class="identifier">TN</span><span class="special">&amp;&gt;</span> <span class="identifier">tie</span><span class="special">(</span><span class="identifier">T1</span><span class="special">&amp;</span> <span class="identifier">t1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">&amp;</span> <span class="identifier">t2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">TN</span><span class="special">&amp;</span> <span class="identifier">tn</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Returns</b></span>: tuple&lt;T1&amp;, T2&amp;, ...,
TN&amp;&gt;(t1, t2, ..., tN). When argument <tt class="computeroutput"><span class="identifier">ti</span></tt>
is <tt class="computeroutput"><span class="identifier">ignore</span></tt>, assigning any
value to the corresponding tuple element has has no effect.
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 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>)
</p>
</div></td>
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<a name="fusion.tuple.class_template_tuple.tuple_helper_classes.description"></a><h5>
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<a href="tuple_helper_classes.html#fusion.tuple.class_template_tuple.tuple_helper_classes.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> provides 2 helper traits, for compile time access to the
tuple size, and the element types.
</p>
<a name="fusion.tuple.class_template_tuple.tuple_helper_classes.specification"></a><h5>
<a name="id634630"></a>
<a href="tuple_helper_classes.html#fusion.tuple.class_template_tuple.tuple_helper_classes.specification">Specification</a>
</h5>
<pre class="programlisting">
<span class="identifier">tuple_size</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">value</span>
</pre>
<p>
<span class="bold"><b>Requires</b></span>: <tt class="computeroutput"><span class="identifier">T</span></tt>
is any fusion sequence type, including <tt class="computeroutput"><span class="identifier">tuple</span></tt>.
</p>
<p>
<span class="bold"><b>Type</b></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"><b>Value</b></span>: The number of elements in the sequence.
Equivalent to <tt class="computeroutput"><a href="../../sequence/intrinsic/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>.
</p>
<pre class="programlisting">
<span class="identifier">tuple_element</span><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Requires</b></span>: <tt class="computeroutput"><span class="identifier">T</span></tt>
is any fusion sequence type, including <tt class="computeroutput"><span class="identifier">tuple</span></tt>.
<tt class="computeroutput"><span class="number">0</span> <span class="special">&lt;=</span>
<span class="identifier">I</span> <span class="special">&lt;</span>
<span class="identifier">N</span></tt> or the program is ill formed.
</p>
<p>
<span class="bold"><b>Value</b></span>: The type of the <tt class="computeroutput"><span class="identifier">I</span></tt>th
element of <tt class="computeroutput"><span class="identifier">T</span></tt>. Equivalent
to <tt class="computeroutput"><a href="../../sequence/intrinsic/metafunctions/value_at.html" title="value_at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>.
</p>
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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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