| Brian Silverman | 5962333 | 2018-08-04 23:36:56 -0700 | [diff] [blame^] | 1 | <?xml version="1.0" encoding="utf-8" ?> |
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| 7 | <title>Forward Traversal Concept</title> |
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| 10 | <body> |
| 11 | <div class="document" id="forward-traversal-concept"> |
| 12 | <h1 class="title">Forward Traversal Concept</h1> |
| 13 | |
| 14 | <!-- Copyright David Abrahams 2006. Distributed under the Boost --> |
| 15 | <!-- Software License, Version 1.0. (See accompanying --> |
| 16 | <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) --> |
| 17 | <p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Forward Traversal</em> |
| 18 | concept if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> meeting the requirements of Default |
| 19 | Constructible and Single Pass Iterator, the following expressions are |
| 20 | valid and respect the stated semantics.</p> |
| 21 | <table border="1" class="docutils"> |
| 22 | <colgroup> |
| 23 | <col width="38%" /> |
| 24 | <col width="34%" /> |
| 25 | <col width="27%" /> |
| 26 | </colgroup> |
| 27 | <thead valign="bottom"> |
| 28 | <tr><th class="head" colspan="3">Forward Traversal Iterator Requirements (in addition to Default Constructible and Single Pass Iterator)</th> |
| 29 | </tr> |
| 30 | <tr><th class="head">Expression</th> |
| 31 | <th class="head">Return Type</th> |
| 32 | <th class="head">Assertion/Note</th> |
| 33 | </tr> |
| 34 | </thead> |
| 35 | <tbody valign="top"> |
| 36 | <tr><td><tt class="docutils literal"><span class="pre">X</span> <span class="pre">u;</span></tt></td> |
| 37 | <td><tt class="docutils literal"><span class="pre">X&</span></tt></td> |
| 38 | <td>note: <tt class="docutils literal"><span class="pre">u</span></tt> may have a |
| 39 | singular value.</td> |
| 40 | </tr> |
| 41 | <tr><td><tt class="docutils literal"><span class="pre">++r</span></tt></td> |
| 42 | <td><tt class="docutils literal"><span class="pre">X&</span></tt></td> |
| 43 | <td><tt class="docutils literal"><span class="pre">r</span> <span class="pre">==</span> <span class="pre">s</span></tt> and <tt class="docutils literal"><span class="pre">r</span></tt> is |
| 44 | dereferenceable implies |
| 45 | <tt class="docutils literal"><span class="pre">++r</span> <span class="pre">==</span> <span class="pre">++s.</span></tt></td> |
| 46 | </tr> |
| 47 | <tr><td><tt class="docutils literal"><span class="pre">iterator_traits<X>::difference_type</span></tt></td> |
| 48 | <td>A signed integral type representing |
| 49 | the distance between iterators</td> |
| 50 | <td> </td> |
| 51 | </tr> |
| 52 | <tr><td><tt class="docutils literal"><span class="pre">iterator_traversal<X>::type</span></tt></td> |
| 53 | <td>Convertible to |
| 54 | <tt class="docutils literal"><span class="pre">forward_traversal_tag</span></tt></td> |
| 55 | <td> </td> |
| 56 | </tr> |
| 57 | </tbody> |
| 58 | </table> |
| 59 | </div> |
| 60 | <div class="footer"> |
| 61 | <hr class="footer" /> |
| 62 | <a class="reference external" href="ForwardTraversal.rst">View document source</a>. |
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| 64 | |
| 65 | </div> |
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