<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>pop_heap</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="../heap.html" title="Heap algorithms"> <link rel="prev" href="push_heap.html" title="push_heap"> <link rel="next" href="make_heap.html" title="make_heap"> </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="push_heap.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../heap.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="make_heap.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.heap.pop_heap"></a><a class="link" href="pop_heap.html" title="pop_heap"> pop_heap</a> </h5></div></div></div> <a name="range.reference.algorithms.heap.pop_heap.prototype"></a><h6> <a name="id849634"></a> <a class="link" href="pop_heap.html#range.reference.algorithms.heap.pop_heap.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">RandomAccessRange</span><span class="special">></span> <span class="identifier">RandomAccessRange</span><span class="special">&</span> <span class="identifier">pop_heap</span><span class="special">(</span><span class="identifier">RandomAccessRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">);</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">RandomAccessRange</span><span class="special">></span> <span class="keyword">const</span> <span class="identifier">RandomAccessRange</span><span class="special">&</span> <span class="identifier">pop_heap</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">RandomAccessRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">);</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">RandomAccessRange</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Compare</span><span class="special">></span> <span class="identifier">RandomAccessRange</span><span class="special">&</span> <span class="identifier">pop_heap</span><span class="special">(</span><span class="identifier">RandomAccessRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">,</span> <span class="identifier">Compare</span> <span class="identifier">pred</span><span class="special">);</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">RandomAccessRange</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Compare</span><span class="special">></span> <span class="keyword">const</span> <span class="identifier">RandomAccessRange</span><span class="special">&</span> <span class="identifier">pop_heap</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">RandomAccessRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">,</span> <span class="identifier">Compare</span> <span class="identifier">pred</span><span class="special">);</span> </pre> <p> </p> <a name="range.reference.algorithms.heap.pop_heap.description"></a><h6> <a name="id850006"></a> <a class="link" href="pop_heap.html#range.reference.algorithms.heap.pop_heap.description">Description</a> </h6> <p> <code class="computeroutput"><span class="identifier">pop_heap</span></code> removes the largest element from the heap. It is assumed that <code class="computeroutput"><span class="identifier">begin</span><span class="special">(</span><span class="identifier">rng</span><span class="special">),</span> <span class="identifier">prior</span><span class="special">(</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">rng</span><span class="special">))</span></code> is already a heap and that the element to be added is <code class="computeroutput"><span class="special">*</span><span class="identifier">prior</span><span class="special">(</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">rng</span><span class="special">))</span></code>. </p> <p> The ordering relationship is determined by using <code class="computeroutput"><span class="keyword">operator</span><span class="special"><</span></code> in the non-predicate versions, and by evaluating <code class="computeroutput"><span class="identifier">pred</span></code> in the predicate versions. </p> <a name="range.reference.algorithms.heap.pop_heap.definition"></a><h6> <a name="id850161"></a> <a class="link" href="pop_heap.html#range.reference.algorithms.heap.pop_heap.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">heap_algorithm</span><span class="special">.</span><span class="identifier">hpp</span></code> </p> <a name="range.reference.algorithms.heap.pop_heap.requirements"></a><h6> <a name="id850232"></a> <a class="link" href="pop_heap.html#range.reference.algorithms.heap.pop_heap.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">RandomAccessRange</span></code> is a model of the <a class="link" href="../../../concepts/random_access_range.html" title="Random Access Range">Random Access Range</a> Concept. </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">RandomAccessRange</span></code> is mutable. </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">RandomAccessRange</span></code>'s value type is a model of the <code class="computeroutput"><span class="identifier">LessThanComparableConcept</span></code>. </li> <li class="listitem"> The ordering of objects of type <code class="computeroutput"><span class="identifier">RandomAccessRange</span></code>'s value type is a <span class="bold"><strong><span class="emphasis"><em>strict weak ordering</em></span></strong></span>, as defined in the <code class="computeroutput"><span class="identifier">LessThanComparableConcept</span></code> requirements. </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">RandomAccessRange</span></code> is a model of the <a class="link" href="../../../concepts/random_access_range.html" title="Random Access Range">Random Access Range</a> Concept. </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">RandomAccessRange</span></code> is mutable. </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">Compare</span></code> is a model of the <code class="computeroutput"><span class="identifier">StrictWeakOrderingConcept</span></code>. </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">RandomAccessRange</span></code>'s value type is convertible to both of <code class="computeroutput"><span class="identifier">Compare</span></code>'s argument types. </li> </ul></div> <a name="range.reference.algorithms.heap.pop_heap.precondition_"></a><h6> <a name="id850490"></a> <a class="link" href="pop_heap.html#range.reference.algorithms.heap.pop_heap.precondition_">Precondition:</a> </h6> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="special">!</span><span class="identifier">empty</span><span class="special">(</span><span class="identifier">rng</span><span class="special">)</span></code> </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">rng</span></code> is a heap. </li> </ul></div> <a name="range.reference.algorithms.heap.pop_heap.complexity"></a><h6> <a name="id850566"></a> <a class="link" href="pop_heap.html#range.reference.algorithms.heap.pop_heap.complexity">Complexity</a> </h6> <p> Logarithmic. At most <code class="computeroutput"><span class="number">2</span> <span class="special">*</span> <span class="identifier">log</span><span class="special">(</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">rng</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="push_heap.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../heap.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="make_heap.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>