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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"> | |
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| 6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
| 7 | <title>The MPL Reference Manual: Random Access Iterator</title> | |
| 8 | <link rel="stylesheet" href="../style.css" type="text/css" /> | |
| 9 | </head> | |
| 10 | <body class="docframe refmanual"> | |
| 11 | <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./bidirectional-iterator.html" class="navigation-link">Prev</a> <a href="./iterator-metafunctions.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./bidirectional-iterator.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iterators-concepts.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> | |
| 12 | <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="./iterators-concepts.html" class="navigation-link">Concepts</a> / <a href="./random-access-iterator.html" class="navigation-link">Random Access Iterator</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="random-access-iterator"> | |
| 15 | <h1><a class="toc-backref" href="./iterators-concepts.html#id1452">Random Access Iterator</a></h1> | |
| 16 | <div class="section" id="id397"> | |
| 17 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 18 | <p>A <a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a> is a <a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a> that provides | |
| 19 | constant-time guarantees on moving the iterator an arbitrary number of positions | |
| 20 | forward or backward and for measuring the distance to another iterator in the | |
| 21 | same sequence.</p> | |
| 22 | </div> | |
| 23 | <div class="section" id="id398"> | |
| 24 | <h3><a class="subsection-title" href="#refinement-of" name="refinement-of">Refinement of</a></h3> | |
| 25 | <p><a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a></p> | |
| 26 | </div> | |
| 27 | <div class="section" id="id399"> | |
| 28 | <h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3> | |
| 29 | <p>In addition to the requirements defined in <a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a>, | |
| 30 | the following requirements must be met.</p> | |
| 31 | <table border="1" class="docutils table"> | |
| 32 | <colgroup> | |
| 33 | <col width="28%" /> | |
| 34 | <col width="44%" /> | |
| 35 | <col width="28%" /> | |
| 36 | </colgroup> | |
| 37 | <thead valign="bottom"> | |
| 38 | <tr><th class="head">Expression</th> | |
| 39 | <th class="head">Type</th> | |
| 40 | <th class="head">Complexity</th> | |
| 41 | </tr> | |
| 42 | </thead> | |
| 43 | <tbody valign="top"> | |
| 44 | <tr><td><tt class="literal"><span class="pre"><a href="./next.html" class="identifier">next</a><i>::type</span></tt></td> | |
| 45 | <td><a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a></td> | |
| 46 | <td>Amortized constant time</td> | |
| 47 | </tr> | |
| 48 | <tr><td><tt class="literal"><span class="pre"><a href="./prior.html" class="identifier">prior</a><i>::type</span></tt></td> | |
| 49 | <td><a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a></td> | |
| 50 | <td>Amortized constant time</td> | |
| 51 | </tr> | |
| 52 | <tr><td><tt class="literal"><span class="pre">i::category</span></tt></td> | |
| 53 | <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a>, convertible | |
| 54 | to <tt class="literal"><span class="pre">random_access_iterator_tag</span></tt></td> | |
| 55 | <td>Constant time</td> | |
| 56 | </tr> | |
| 57 | <tr><td><tt class="literal"><span class="pre"><a href="./advance.html" class="identifier">advance</a><i,n>::type</span></tt></td> | |
| 58 | <td><a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a></td> | |
| 59 | <td>Amortized constant time</td> | |
| 60 | </tr> | |
| 61 | <tr><td><tt class="literal"><span class="pre"><a href="./distance.html" class="identifier">distance</a><i,j>::type</span></tt></td> | |
| 62 | <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> | |
| 63 | <td>Amortized constant time</td> | |
| 64 | </tr> | |
| 65 | </tbody> | |
| 66 | </table> | |
| 67 | </div> | |
| 68 | <div class="section" id="id400"> | |
| 69 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
| 70 | <pre class="literal-block"> | |
| 71 | typedef <a href="./advance.html" class="identifier">advance</a><i,n>::type j; | |
| 72 | </pre> | |
| 73 | <table class="docutils field-list" frame="void" rules="none"> | |
| 74 | <col class="field-name" /> | |
| 75 | <col class="field-body" /> | |
| 76 | <tbody valign="top"> | |
| 77 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body">See <tt class="literal"><span class="pre"><a href="./advance.html" class="identifier">advance</a></span></tt> specification</td> | |
| 78 | </tr> | |
| 79 | </tbody> | |
| 80 | </table> | |
| 81 | <!-- .......................................................................... --> | |
| 82 | <pre class="literal-block"> | |
| 83 | typedef <a href="./distance.html" class="identifier">distance</a><i,j>::type n; | |
| 84 | </pre> | |
| 85 | <table class="docutils field-list" frame="void" rules="none"> | |
| 86 | <col class="field-name" /> | |
| 87 | <col class="field-body" /> | |
| 88 | <tbody valign="top"> | |
| 89 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body">See <tt class="literal"><span class="pre"><a href="./distance.html" class="identifier">distance</a></span></tt> specification</td> | |
| 90 | </tr> | |
| 91 | </tbody> | |
| 92 | </table> | |
| 93 | </div> | |
| 94 | <div class="section" id="id401"> | |
| 95 | <h3><a class="subsection-title" href="#invariants" name="invariants">Invariants</a></h3> | |
| 96 | <p>For any random access iterators <tt class="literal"><span class="pre">i</span></tt> and <tt class="literal"><span class="pre">j</span></tt> the following invariants always | |
| 97 | hold:</p> | |
| 98 | <ul class="simple"> | |
| 99 | <li>If <tt class="literal"><span class="pre"><a href="./advance.html" class="identifier">advance</a><i,n>::type</span></tt> is well-defined, then | |
| 100 | <tt class="literal"><span class="pre"><a href="./advance.html" class="identifier">advance</a><</span> <span class="pre"><a href="./advance.html" class="identifier">advance</a><i,n>::type,</span> <span class="pre"><a href="./negate.html" class="identifier">negate</a><n>::type</span> <span class="pre">>::type</span></tt> is a null operation.</li> | |
| 101 | </ul> | |
| 102 | </div> | |
| 103 | <div class="section" id="id402"> | |
| 104 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 105 | <p><a class="reference internal" href="./iterators.html">Iterators</a>, <a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a>, <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>, <a class="reference internal" href="./advance.html">advance</a>, <a class="reference internal" href="./distance.html">distance</a></p> | |
| 106 | </div> | |
| 107 | </div> | |
| 108 | ||
| 109 | <div class="footer-separator"></div> | |
| 110 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./bidirectional-iterator.html" class="navigation-link">Prev</a> <a href="./iterator-metafunctions.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./bidirectional-iterator.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iterators-concepts.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> | |
| 111 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 112 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 113 | file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body> | |
| 114 | </html> |