1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Relational operators</title> 5<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../index.html" title="Chapter 1. Fusion 2.2"> 8<link rel="up" href="../class_template_tuple.html" title="Class template tuple"> 9<link rel="prev" href="element_access.html" title="Element access"> 10<link rel="next" href="../pairs.html" title="Pairs"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="element_access.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../class_template_tuple.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../pairs.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 27<a name="fusion.tuple.class_template_tuple.relational_operators"></a><a class="link" href="relational_operators.html" title="Relational operators">Relational 28 operators</a> 29</h4></div></div></div> 30<h6> 31<a name="fusion.tuple.class_template_tuple.relational_operators.h0"></a> 32 <span class="phrase"><a name="fusion.tuple.class_template_tuple.relational_operators.description"></a></span><a class="link" href="relational_operators.html#fusion.tuple.class_template_tuple.relational_operators.description">Description</a> 33 </h6> 34<p> 35 The <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2002/n1403.pdf" target="_top">TR1 36 Tuple</a> provides the standard boolean relational operators. 37 </p> 38<h6> 39<a name="fusion.tuple.class_template_tuple.relational_operators.h1"></a> 40 <span class="phrase"><a name="fusion.tuple.class_template_tuple.relational_operators.specification"></a></span><a class="link" href="relational_operators.html#fusion.tuple.class_template_tuple.relational_operators.specification">Specification</a> 41 </h6> 42<div class="variablelist"> 43<p class="title"><b>Notation</b></p> 44<dl class="variablelist"> 45<dt><span class="term"><code class="computeroutput"><span class="identifier">T1</span> <span class="special">...</span> 46 <span class="identifier">TN</span></code>, <code class="computeroutput"><span class="identifier">U1</span> 47 <span class="special">...</span> <span class="identifier">UN</span></code></span></dt> 48<dd><p> 49 Tuple element types 50 </p></dd> 51<dt><span class="term"><code class="computeroutput"><span class="identifier">P1</span> <span class="special">...</span> 52 <span class="identifier">PN</span></code></span></dt> 53<dd><p> 54 Parameter types 55 </p></dd> 56<dt><span class="term"><code class="computeroutput"><span class="identifier">Ti</span></code>, <code class="computeroutput"><span class="identifier">Ui</span></code></span></dt> 57<dd><p> 58 The type of the <code class="computeroutput"><span class="identifier">i</span></code>th 59 element of a tuple 60 </p></dd> 61<dt><span class="term"><code class="computeroutput"><span class="identifier">Pi</span></code></span></dt> 62<dd><p> 63 The type of the <code class="computeroutput"><span class="identifier">i</span></code>th 64 parameter 65 </p></dd> 66</dl> 67</div> 68<pre class="programlisting"><span class="keyword">template</span><span class="special"><</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> 69 <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">></span> 70<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span> 71 <span class="keyword">const</span> <span class="identifier">tuple</span><span class="special"><</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> <span class="identifier">lhs</span><span class="special">,</span> 72 <span class="keyword">const</span> <span class="identifier">tuple</span><span class="special"><</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">>&</span> <span class="identifier">rhs</span><span class="special">);</span> 73</pre> 74<p> 75 <span class="bold"><strong>Requirements</strong></span>: For all <code class="computeroutput"><span class="identifier">i</span></code>, 76 <code class="computeroutput"><span class="number">1</span> <span class="special"><=</span> 77 <span class="identifier">i</span> <span class="special"><</span> 78 <span class="identifier">N</span></code>, <code class="computeroutput"><a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">lhs</span><span class="special">)</span> <span class="special">==</span> <a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">rhs</span><span class="special">)</span></code> 79 is a valid expression returning a type that is convertible to <code class="computeroutput"><span class="keyword">bool</span></code>. 80 </p> 81<p> 82 <span class="bold"><strong>Semantics</strong></span>: Returns <code class="computeroutput"><span class="keyword">true</span></code> 83 if and only if <code class="computeroutput"><a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">lhs</span><span class="special">)</span> <span class="special">==</span> <a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">rhs</span><span class="special">)</span></code> 84 for all <code class="computeroutput"><span class="identifier">i</span></code>. For any 2 zero 85 length tuples <code class="computeroutput"><span class="identifier">e</span></code> and <code class="computeroutput"><span class="identifier">f</span></code>, <code class="computeroutput"><span class="identifier">e</span> 86 <span class="special">==</span> <span class="identifier">f</span></code> 87 returns <code class="computeroutput"><span class="keyword">true</span></code>. 88 </p> 89<pre class="programlisting"><span class="keyword">template</span><span class="special"><</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> 90 <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">></span> 91<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special"><(</span> 92 <span class="keyword">const</span> <span class="identifier">tuple</span><span class="special"><</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> <span class="identifier">lhs</span><span class="special">,</span> 93 <span class="keyword">const</span> <span class="identifier">tuple</span><span class="special"><</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">>&</span> <span class="identifier">rhs</span><span class="special">);</span> 94</pre> 95<p> 96 <span class="bold"><strong>Requirements</strong></span>: For all <code class="computeroutput"><span class="identifier">i</span></code>, 97 <code class="computeroutput"><span class="number">1</span> <span class="special"><=</span> 98 <span class="identifier">i</span> <span class="special"><</span> 99 <span class="identifier">N</span></code>, <code class="computeroutput"><a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">lhs</span><span class="special">)</span> <span class="special"><</span> <a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">rhs</span><span class="special">)</span></code> 100 is a valid expression returning a type that is convertible to <code class="computeroutput"><span class="keyword">bool</span></code>. 101 </p> 102<p> 103 <span class="bold"><strong>Semantics</strong></span>: Returns the lexicographical 104 comparison of between <code class="computeroutput"><span class="identifier">lhs</span></code> 105 and <code class="computeroutput"><span class="identifier">rhs</span></code>. 106 </p> 107<pre class="programlisting"><span class="keyword">template</span><span class="special"><</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> 108 <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">></span> 109<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!=(</span> 110 <span class="keyword">const</span> <span class="identifier">tuple</span><span class="special"><</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> <span class="identifier">lhs</span><span class="special">,</span> 111 <span class="keyword">const</span> <span class="identifier">tuple</span><span class="special"><</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">>&</span> <span class="identifier">rhs</span><span class="special">);</span> 112</pre> 113<p> 114 <span class="bold"><strong>Requirements</strong></span>: For all <code class="computeroutput"><span class="identifier">i</span></code>, 115 <code class="computeroutput"><span class="number">1</span> <span class="special"><=</span> 116 <span class="identifier">i</span> <span class="special"><</span> 117 <span class="identifier">N</span></code>, <code class="computeroutput"><a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">lhs</span><span class="special">)</span> <span class="special">==</span> <a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">rhs</span><span class="special">)</span></code> 118 is a valid expression returning a type that is convertible to <code class="computeroutput"><span class="keyword">bool</span></code>. 119 </p> 120<p> 121 <span class="bold"><strong>Semantics</strong></span>: Returns <code class="computeroutput"><span class="special">!(</span><span class="identifier">lhs</span> <span class="special">==</span> <span class="identifier">rhs</span><span class="special">)</span></code>. 122 </p> 123<pre class="programlisting"><span class="keyword">template</span><span class="special"><</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> 124 <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">></span> 125<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special"><=(</span> 126 <span class="keyword">const</span> <span class="identifier">tuple</span><span class="special"><</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> <span class="identifier">lhs</span><span class="special">,</span> 127 <span class="keyword">const</span> <span class="identifier">tuple</span><span class="special"><</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">>&</span> <span class="identifier">rhs</span><span class="special">);</span> 128</pre> 129<p> 130 <span class="bold"><strong>Requirements</strong></span>: For all <code class="computeroutput"><span class="identifier">i</span></code>, 131 <code class="computeroutput"><span class="number">1</span> <span class="special"><=</span> 132 <span class="identifier">i</span> <span class="special"><</span> 133 <span class="identifier">N</span></code>, <code class="computeroutput"><a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">rhs</span><span class="special">)</span> <span class="special"><</span> <a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">lhs</span><span class="special">)</span></code> 134 is a valid expression returning a type that is convertible to <code class="computeroutput"><span class="keyword">bool</span></code>. 135 </p> 136<p> 137 <span class="bold"><strong>Semantics</strong></span>: Returns <code class="computeroutput"><span class="special">!(</span><span class="identifier">rhs</span> <span class="special"><</span> <span class="identifier">lhs</span><span class="special">)</span></code> 138 </p> 139<pre class="programlisting"><span class="keyword">template</span><span class="special"><</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> 140 <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">></span> 141<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">>(</span> 142 <span class="keyword">const</span> <span class="identifier">tuple</span><span class="special"><</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> <span class="identifier">lhs</span><span class="special">,</span> 143 <span class="keyword">const</span> <span class="identifier">tuple</span><span class="special"><</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">>&</span> <span class="identifier">rhs</span><span class="special">);</span> 144</pre> 145<p> 146 <span class="bold"><strong>Requirements</strong></span>: For all <code class="computeroutput"><span class="identifier">i</span></code>, 147 <code class="computeroutput"><span class="number">1</span> <span class="special"><=</span> 148 <span class="identifier">i</span> <span class="special"><</span> 149 <span class="identifier">N</span></code>, <code class="computeroutput"><a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">rhs</span><span class="special">)</span> <span class="special"><</span> <a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">lhs</span><span class="special">)</span></code> 150 is a valid expression returning a type that is convertible to <code class="computeroutput"><span class="keyword">bool</span></code>. 151 </p> 152<p> 153 <span class="bold"><strong>Semantics</strong></span>: Returns <code class="computeroutput"><span class="identifier">rhs</span> 154 <span class="special"><</span> <span class="identifier">lhs</span></code>. 155 </p> 156<pre class="programlisting"><span class="keyword">template</span><span class="special"><</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> 157 <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">></span> 158<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">>=(</span> 159 <span class="keyword">const</span> <span class="identifier">tuple</span><span class="special"><</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> <span class="identifier">lhs</span><span class="special">,</span> 160 <span class="keyword">const</span> <span class="identifier">tuple</span><span class="special"><</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">>&</span> <span class="identifier">rhs</span><span class="special">);</span> 161</pre> 162<p> 163 <span class="bold"><strong>Requirements</strong></span>: For all <code class="computeroutput"><span class="identifier">i</span></code>, 164 <code class="computeroutput"><span class="number">1</span> <span class="special"><=</span> 165 <span class="identifier">i</span> <span class="special"><</span> 166 <span class="identifier">N</span></code>, <code class="computeroutput"><a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">lhs</span><span class="special">)</span> <span class="special"><</span> <a class="link" href="element_access.html" title="Element access"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special"><</span><span class="identifier">i</span><span class="special">>(</span><span class="identifier">rhs</span><span class="special">)</span></code> 167 is a valid expression returning a type that is convertible to <code class="computeroutput"><span class="keyword">bool</span></code>. 168 </p> 169<p> 170 <span class="bold"><strong>Semantics</strong></span>: Returns <code class="computeroutput"><span class="special">!(</span><span class="identifier">lhs</span> <span class="special"><</span> <span class="identifier">rhs</span><span class="special">)</span></code>. 171 </p> 172</div> 173<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 174<td align="left"></td> 175<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman, 176 Dan Marsden, Tobias Schwinger<p> 177 Distributed under the Boost Software License, Version 1.0. (See accompanying 178 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>) 179 </p> 180</div></td> 181</tr></table> 182<hr> 183<div class="spirit-nav"> 184<a accesskey="p" href="element_access.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../class_template_tuple.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../pairs.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 185</div> 186</body> 187</html> 188
