<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Functions</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="../semantics.html" title="Semantics"> <link rel="prev" href="metafunctions.html" title="Metafunctions"> <link rel="next" href="../../adaptors.html" title="Range Adaptors"> </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 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class="informaltable"><table class="table"> <colgroup> <col> <col> <col> </colgroup> <thead><tr> <th> <p> Expression </p> </th> <th> <p> Return type </p> </th> <th> <p> Returns </p> </th> <th> <p> Complexity </p> </th> </tr></thead> <tbody> <tr> <td> <p> <code class="computeroutput"><span class="identifier">begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_iterator</span><span class="special"><</span><span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">p</span><span class="special">.</span><span class="identifier">first</span></code> if <code class="computeroutput"><span class="identifier">p</span></code> is of type <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code> <code class="computeroutput"><span class="identifier">a</span></code> if <code class="computeroutput"><span class="identifier">a</span></code> is an array <code class="computeroutput"><span class="identifier">range_begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> if that expression would invoke a function found by ADL <code class="computeroutput"><span class="identifier">t</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()</span></code> otherwise </p> </td> <td> <p> constant time </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">end</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_iterator</span><span class="special"><</span><span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">p</span><span class="special">.</span><span class="identifier">second</span></code> if <code class="computeroutput"><span class="identifier">p</span></code> is of type <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code> <code class="computeroutput"><span class="identifier">a</span> <span class="special">+</span> <span class="identifier">sz</span></code> if <code class="computeroutput"><span class="identifier">a</span></code> is an array of size <code class="computeroutput"><span class="identifier">sz</span></code> <code class="computeroutput"><span class="identifier">range_end</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> if that expression would invoke a function found by ADL <code class="computeroutput"><span class="identifier">t</span><span class="special">.</span><span class="identifier">end</span><span class="special">()</span></code> otherwise </p> </td> <td> <p> constant time </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">empty</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="keyword">bool</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> constant time </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">distance</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_difference</span><span class="special"><</span><span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">),</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">x</span><span class="special">))</span></code> </p> </td> <td> <p> - </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">size</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_difference</span><span class="special"><</span><span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span> <span class="special">-</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> constant time </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">rbegin</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_reverse_iterator</span><span class="special"><</span><span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_reverse_iterator</span><span class="special"><</span><span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">x</span><span class="special">))</span></code> </p> </td> <td> <p> constant time </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">rend</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_reverse_iterator</span><span class="special"><</span><span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_reverse_iterator</span><span class="special"><</span><span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">))</span></code> </p> </td> <td> <p> constant time </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">const_begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">))</span></code> </p> </td> <td> <p> constant time </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">const_end</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">x</span><span class="special">))</span></code> </p> </td> <td> <p> constant time </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">const_rbegin</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_reverse_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_reverse_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">rbegin</span><span class="special">(</span><span class="identifier">x</span><span class="special">))</span></code> </p> </td> <td> <p> constant time </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">const_rend</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_reverse_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">range_reverse_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">rend</span><span class="special">(</span><span class="identifier">x</span><span class="special">))</span></code> </p> </td> <td> <p> constant time </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">as_literal</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">iterator_range</span><span class="special"><</span><span class="identifier">U</span><span class="special">></span></code> where <code class="computeroutput"><span class="identifier">U</span></code> is <code class="computeroutput"><span class="identifier">Char</span><span class="special">*</span></code> if <code class="computeroutput"><span class="identifier">x</span></code> is a pointer to a string and <code class="computeroutput"><span class="identifier">U</span></code> is <code class="computeroutput"><span class="identifier">range_iterator</span><span class="special"><</span><span class="identifier">X</span><span class="special">>::</span><span class="identifier">type</span></code> otherwise </p> </td> <td> <p> <code class="computeroutput"><span class="special">[</span><span class="identifier">s</span><span class="special">,</span><span class="identifier">s</span> <span class="special">+</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special"><</span><span class="identifier">X</span><span class="special">>::</span><span class="identifier">length</span><span class="special">(</span><span class="identifier">s</span><span class="special">))</span></code> if <code class="computeroutput"><span class="identifier">s</span></code> is a <code class="computeroutput"><span class="identifier">Char</span><span class="special">*</span></code> or an array of <code class="computeroutput"><span class="identifier">Char</span></code> <code class="computeroutput"><span class="special">[</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">),</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">x</span><span class="special">))</span></code> otherwise </p> </td> <td> <p> linear time for pointers to a string or arrays of <code class="computeroutput"><span class="identifier">Char</span></code>, constant time otherwise </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">as_array</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">iterator_range</span><span class="special"><</span><span class="identifier">X</span><span class="special">></span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="special">[</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">),</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">x</span><span class="special">))</span></code> </p> </td> <td class="auto-generated"> </td> </tr> </tbody> </table></div> <p> The special <code class="computeroutput"><span class="identifier">const_</span></code>-named functions are useful when you want to document clearly that your code is read-only. </p> <p> <code class="computeroutput"><span class="identifier">as_literal</span><span class="special">()</span></code> can be used <span class="emphasis"><em><span class="bold"><strong>internally</strong></span></em></span> in string algorithm libraries such that arrays of characters are handled correctly. </p> <p> <code class="computeroutput"><span class="identifier">as_array</span><span class="special">()</span></code> can be used with string algorithm libraries to make it clear that arrays of characters are handled like an array and not like a string. </p> <p> Notice that the above functions should always be called with qualification (<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span></code>) to prevent <span class="emphasis"><em><span class="bold"><strong>unintended</strong></span></em></span> Argument Dependent Lookup (ADL). </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="metafunctions.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../semantics.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="../../adaptors.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>