| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>equal</title> |
| <link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css"> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> |
| <link rel="home" href="../../../../index.html" title="Chapter 1. Range 2.0"> |
| <link rel="up" href="../non_mutating.html" title="Non-mutating algorithms"> |
| <link rel="prev" href="count_if.html" title="count_if"> |
| <link rel="next" href="equal_range.html" title="equal_range"> |
| </head> |
| <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> |
| <table cellpadding="2" width="100%"><tr> |
| <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td> |
| <td align="center"><a href="../../../../../../../../index.html">Home</a></td> |
| <td align="center"><a href="../../../../../../../../libs/libraries.htm">Libraries</a></td> |
| <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> |
| <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> |
| <td align="center"><a href="../../../../../../../../more/index.htm">More</a></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="count_if.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../non_mutating.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="equal_range.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="range.reference.algorithms.non_mutating.equal"></a><a class="link" href="equal.html" title="equal">equal</a> |
| </h5></div></div></div> |
| <a name="range.reference.algorithms.non_mutating.equal.prototype"></a><h6> |
| <a name="id714837"></a> |
| <a class="link" href="equal.html#range.reference.algorithms.non_mutating.equal.prototype">Prototype</a> |
| </h6> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> |
| <span class="keyword">class</span> <span class="identifier">SinglePassRange1</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">SinglePassRange2</span> |
| <span class="special">></span> |
| <span class="keyword">bool</span> <span class="identifier">equal</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">SinglePassRange1</span><span class="special">&</span> <span class="identifier">rng1</span><span class="special">,</span> |
| <span class="keyword">const</span> <span class="identifier">SinglePassRange2</span><span class="special">&</span> <span class="identifier">rng2</span><span class="special">);</span> |
| |
| <span class="keyword">template</span><span class="special"><</span> |
| <span class="keyword">class</span> <span class="identifier">SinglePassRange1</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">SinglePassRange2</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">BinaryPredicate</span> |
| <span class="special">></span> |
| <span class="keyword">bool</span> <span class="identifier">equal</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">SinglePassRange1</span><span class="special">&</span> <span class="identifier">rng1</span><span class="special">,</span> |
| <span class="keyword">const</span> <span class="identifier">SinglePassRange2</span><span class="special">&</span> <span class="identifier">rng2</span><span class="special">,</span> |
| <span class="identifier">BinaryPredicate</span> <span class="identifier">pred</span><span class="special">);</span> |
| </pre> |
| <p> |
| </p> |
| <a name="range.reference.algorithms.non_mutating.equal.description"></a><h6> |
| <a name="id715120"></a> |
| <a class="link" href="equal.html#range.reference.algorithms.non_mutating.equal.description">Description</a> |
| </h6> |
| <p> |
| <code class="computeroutput"><span class="identifier">equal</span></code> returns <code class="computeroutput"><span class="keyword">true</span></code> if <code class="computeroutput"><span class="identifier">distance</span><span class="special">(</span><span class="identifier">rng1</span><span class="special">)</span></code> is equal to the <code class="computeroutput"><span class="identifier">distance</span><span class="special">(</span><span class="identifier">rng2</span><span class="special">)</span></code> and for each element <code class="computeroutput"><span class="identifier">x</span></code> |
| in <code class="computeroutput"><span class="identifier">rng1</span></code>, the corresponding |
| element <code class="computeroutput"><span class="identifier">y</span></code> in <code class="computeroutput"><span class="identifier">rng2</span></code> is equal. Otherwise <code class="computeroutput"><span class="keyword">false</span></code> is returned. |
| </p> |
| <p> |
| In this range version of <code class="computeroutput"><span class="identifier">equal</span></code> |
| it is perfectly acceptable to pass in two ranges of unequal lengths. |
| </p> |
| <p> |
| Elements are considered equal in the non-predicate version if <code class="computeroutput"><span class="keyword">operator</span><span class="special">==</span></code> |
| returns <code class="computeroutput"><span class="keyword">true</span></code>. Elements are |
| considered equal in the predicate version if <code class="computeroutput"><span class="identifier">pred</span><span class="special">(</span><span class="identifier">x</span><span class="special">,</span><span class="identifier">y</span><span class="special">)</span></code> is <code class="computeroutput"><span class="keyword">true</span></code>. |
| </p> |
| <a name="range.reference.algorithms.non_mutating.equal.definition"></a><h6> |
| <a name="id715354"></a> |
| <a class="link" href="equal.html#range.reference.algorithms.non_mutating.equal.definition">Definition</a> |
| </h6> |
| <p> |
| Defined in the header file <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">range</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">equal</span><span class="special">.</span><span class="identifier">hpp</span></code> |
| </p> |
| <a name="range.reference.algorithms.non_mutating.equal.requirements"></a><h6> |
| <a name="id715424"></a> |
| <a class="link" href="equal.html#range.reference.algorithms.non_mutating.equal.requirements">Requirements</a> |
| </h6> |
| <p> |
| <span class="bold"><strong>For the non-predicate versions:</strong></span> |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">SinglePassRange1</span></code> |
| is a model of the <a class="link" href="../../../concepts/single_pass_range.html" title="Single Pass Range">Single |
| Pass Range</a> Concept. |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">SinglePassRange2</span></code> |
| is a model of the <a class="link" href="../../../concepts/single_pass_range.html" title="Single Pass Range">Single |
| Pass Range</a> Concept. |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">SinglePassRange1</span></code>'s |
| value type is a model of the <code class="computeroutput"><span class="identifier">EqualityComparableConcept</span></code>. |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">SinglePassRange2</span></code>'s |
| value type is a model of the <code class="computeroutput"><span class="identifier">EqualityComparableConcept</span></code>. |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">SinglePassRange1</span></code>'s |
| value type can be compared for equality with <code class="computeroutput"><span class="identifier">SinglePassRange2</span></code>'s |
| value type. |
| </li> |
| </ul></div> |
| <p> |
| <span class="bold"><strong>For the predicate versions:</strong></span> |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">SinglePassRange1</span></code> |
| is a model of the <a class="link" href="../../../concepts/single_pass_range.html" title="Single Pass Range">Single |
| Pass Range</a> Concept. |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">SinglePassRange2</span></code> |
| is a model of the <a class="link" href="../../../concepts/single_pass_range.html" title="Single Pass Range">Single |
| Pass Range</a> Concept. |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">BinaryPredicate</span></code> is |
| a model of the <code class="computeroutput"><span class="identifier">BinaryPredicateConcept</span></code>. |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">SinglePassRange1</span></code>'s |
| value type is convertible to <code class="computeroutput"><span class="identifier">BinaryPredicate</span></code>'s |
| first argument type. |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">SinglePassRange2</span></code>'s |
| value type is convertible to <code class="computeroutput"><span class="identifier">BinaryPredicate</span></code>'s |
| second argument type. |
| </li> |
| </ul></div> |
| <a name="range.reference.algorithms.non_mutating.equal.complexity"></a><h6> |
| <a name="id715734"></a> |
| <a class="link" href="equal.html#range.reference.algorithms.non_mutating.equal.complexity">Complexity</a> |
| </h6> |
| <p> |
| Linear. At most <code class="computeroutput"><span class="identifier">min</span><span class="special">(</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">rng1</span><span class="special">),</span> <span class="identifier">distance</span><span class="special">(</span><span class="identifier">rng2</span><span class="special">))</span></code> |
| comparisons. |
| </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 © 2003 -2010 Thorsten Ottosen, Neil Groves<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> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="count_if.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../non_mutating.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="equal_range.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| </body> |
| </html> |