Planet
navi homePPSaboutscreenshotsdownloaddevelopmentforum

source: downloads/boost_1_34_1/libs/mpl/doc/refmanual/distance.html @ 29

Last change on this file since 29 was 29, checked in by landauf, 17 years ago

updated boost from 1_33_1 to 1_34_1
File size: 8.7 KB
Line 
1<?xml version="1.0" encoding="utf-8" ?>
2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
4<!-- Copyright Aleksey Gurtovoy 2006. Distributed under the Boost -->
5<!-- Software License, Version 1.0. (See accompanying -->
6<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
7<head>
8<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
9<meta name="generator" content="Docutils 0.3.6: http://docutils.sourceforge.net/" />
10<title>The MPL Reference Manual: distance</title>
11<link rel="stylesheet" href="../style.css" type="text/css" />
12</head>
13<body class="docframe refmanual">
14<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./advance.html" class="navigation-link">Prev</a>&nbsp;<a href="./next.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./advance.html" class="navigation-link">Back</a>&nbsp;<a href="./next.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./iterator-metafunctions.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
15<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./iterators.html" class="navigation-link">Iterators</a> / <a href="./iterator-metafunctions.html" class="navigation-link">Iterator Metafunctions</a> / <a href="./distance.html" class="navigation-link">distance</a></td>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="distance">
18<h1><a class="toc-backref" href="./iterator-metafunctions.html#id383" name="distance">distance</a></h1>
19<div class="section" id="distance-synopsis">
20<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
21<pre class="literal-block">
22template&lt;
23      typename First
24    , typename Last
25    &gt;
26struct <a href="./distance.html" class="identifier">distance</a>
27{
28    typedef <em>unspecified</em> type;
29};
30</pre>
31</div>
32<div class="section" id="distance-description">
33<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
34<p>Returns the distance between <tt class="literal"><span class="pre">First</span></tt> and <tt class="literal"><span class="pre">Last</span></tt> iterators, that is, an
35<a class="reference" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">n</span></tt> such that <tt class="literal"><span class="pre"><a href="./advance.html" class="identifier">advance</a>&lt;First,n&gt;::type</span></tt> is
36identical to <tt class="literal"><span class="pre">Last</span></tt>.</p>
37</div>
38<div class="section" id="distance-header">
39<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
40<pre class="literal-block">
41#include &lt;<a href="../../../../boost/mpl/distance.hpp" class="header">boost/mpl/distance.hpp</a>&gt;
42</pre>
43</div>
44<div class="section" id="distance-parameters">
45<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
46<table border="1" class="table">
47<colgroup>
48<col width="19%" />
49<col width="35%" />
50<col width="45%" />
51</colgroup>
52<thead valign="bottom">
53<tr><th>Parameter</th>
54<th>Requirement</th>
55<th>Description</th>
56</tr>
57</thead>
58<tbody valign="top">
59<tr><td><tt class="literal"><span class="pre">First</span></tt>,
60<tt class="literal"><span class="pre">Last</span></tt></td>
61<td><a class="reference" href="./forward-iterator.html">Forward Iterator</a></td>
62<td>Iterators to compute a
63distance between.</td>
64</tr>
65</tbody>
66</table>
67</div>
68<div class="section" id="distance-model-of">
69<h3><a class="subsection-title" href="#model-of" name="model-of">Model Of</a></h3>
70<p><a class="reference" href="./tag-dispatched.html">Tag Dispatched Metafunction</a></p>
71</div>
72<div class="section" id="distance-expression-semantics">
73<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
74<p>For any <a class="reference" href="./forward-iterator.html">Forward Iterator</a>s <tt class="literal"><span class="pre">first</span></tt> and <tt class="literal"><span class="pre">last</span></tt>:</p>
75<pre class="literal-block">
76typedef <a href="./distance.html" class="identifier">distance</a>&lt;first,last&gt;::type n;
77</pre>
78<table class="field-list" frame="void" rules="none">
79<col class="field-name" />
80<col class="field-body" />
81<tbody valign="top">
82<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference" href="./integral-constant.html">Integral Constant</a>.</td>
83</tr>
84<tr class="field"><th class="field-name">Precondition:</th><td class="field-body">[<tt class="literal"><span class="pre">first</span></tt>, <tt class="literal"><span class="pre">last</span></tt>) is a valid range.</td>
85</tr>
86<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
87<pre class="last literal-block">
88typedef <a href="./iter-fold.html" class="identifier">iter_fold</a>&lt;
89      <a href="./iterator-range.html" class="identifier">iterator_range</a>&lt;first,last&gt;
90    , <a href="./long.html" class="identifier">long_</a>&lt;0&gt;
91    , <a href="./next.html" class="identifier">next</a>&lt;_1&gt;
92    &gt;::type n;
93</pre>
94</td>
95</tr>
96<tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><tt class="literal"><span class="pre">is_same&lt;</span> <span class="pre"><a href="./advance.html" class="identifier">advance</a>&lt;first,n&gt;::type,</span> <span class="pre">last</span> <span class="pre">&gt;::value</span> <span class="pre">==</span> <span class="pre">true</span></tt>.</td>
97</tr>
98</tbody>
99</table>
100</div>
101<div class="section" id="distance-complexity">
102<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
103<p>Amortized constant time if <tt class="literal"><span class="pre">first</span></tt> and <tt class="literal"><span class="pre">last</span></tt> are <a class="reference" href="./random-access-iterator.html">Random Access Iterator</a>s,
104otherwise linear time.</p>
105</div>
106<div class="section" id="distance-example">
107<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
108<pre class="literal-block">
109typedef <a href="./range-c.html" class="identifier">range_c</a>&lt;int,0,10&gt;::type range;
110typedef <a href="./begin.html" class="identifier">begin</a>&lt;range&gt;::type first;
111typedef <a href="./end.html" class="identifier">end</a>&lt;range&gt;::type last;
112
113<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( (<a href="./distance.html" class="identifier">distance</a>&lt;first,last&gt;::value), ==, 10);
114</pre>
115</div>
116<div class="section" id="distance-see-also">
117<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
118<p><a class="reference" href="./iterators.html">Iterators</a>, <a class="reference" href="./tag-dispatched.html">Tag Dispatched Metafunction</a>, <a class="refentry reference" href="./advance.html"><tt class="refentry literal"><span class="pre">advance</span></tt></a>, <a class="refentry reference" href="./next.html"><tt class="refentry literal"><span class="pre">next</span></tt></a>, <a class="refentry reference" href="./prior.html"><tt class="refentry literal"><span class="pre">prior</span></tt></a></p>
119<!-- modtime: November 11, 2004 11:16:46 +0000 -->
120<!-- Iterators/Iterator Metafunctions//next |30 -->
121</div>
122</div>
123
124<div class="footer-separator"></div>
125<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./advance.html" class="navigation-link">Prev</a>&nbsp;<a href="./next.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./advance.html" class="navigation-link">Back</a>&nbsp;<a href="./next.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./iterator-metafunctions.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
126</tr></table></body>
127</html>
Note: See TracBrowser for help on using the repository browser.