| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>Concept Checking</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="../concepts.html" title="Range Concepts"> |
| <link rel="prev" href="random_access_range.html" title="Random Access Range"> |
| <link rel="next" href="../reference.html" title="Reference"> |
| </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="random_access_range.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.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="../reference.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="range.concepts.concept_checking"></a><a class="link" href="concept_checking.html" title="Concept Checking">Concept Checking</a> |
| </h3></div></div></div> |
| <p> |
| Each of the range concepts has a corresponding concept checking class in |
| the file <a href="../../../../../../boost/range/concepts.hpp" target="_top"><code class="computeroutput"><span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">range</span><span class="special">/</span><span class="identifier">concepts</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code></a>. |
| These classes may be used in conjunction with the <a href="../../../../../../libs/concept_check/index.html" target="_top">Boost |
| Concept Check library</a> to ensure that the type of a template parameter |
| is compatible with a range concept. If not, a meaningful compile time error |
| is generated. Checks are provided for the range concepts related to iterator |
| traversal categories. For example, the following line checks that the type |
| <code class="computeroutput"><span class="identifier">T</span></code> models the <a class="link" href="forward_range.html" title="Forward Range">Forward |
| Range</a> concept. |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">BOOST_CONCEPT_ASSERT</span><span class="special">((</span> <span class="identifier">ForwardRangeConcept</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">));</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| An additional concept check is required for the value access property of |
| the range based on the range's iterator type. For example to check for a |
| ForwardReadableRange, the following code is required. |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">BOOST_CONCEPT_ASSERT</span><span class="special">((</span> <span class="identifier">ForwardRangeConcept</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">));</span> |
| <span class="identifier">BOOST_CONCEPT_ASSERT</span><span class="special">((</span> <span class="identifier">ReadableIteratorConcept</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">range_iterator</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span><span class="special">></span> <span class="special">));</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| The following range concept checking classes are provided. |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| Class SinglePassRangeConcept checks for <a class="link" href="single_pass_range.html" title="Single Pass Range">Single |
| Pass Range</a> |
| </li> |
| <li class="listitem"> |
| Class ForwardRangeConcept checks for <a class="link" href="forward_range.html" title="Forward Range">Forward |
| Range</a> |
| </li> |
| <li class="listitem"> |
| Class BidirectionalRangeConcept checks for <a class="link" href="bidirectional_range.html" title="Bidirectional Range">Bidirectional |
| Range</a> |
| </li> |
| <li class="listitem"> |
| Class RandomAccessRangeConcept checks for <a class="link" href="random_access_range.html" title="Random Access Range">Random |
| Access Range</a> |
| </li> |
| </ul></div> |
| <a name="range.concepts.concept_checking.see_also"></a><h5> |
| <a name="id764273"></a> |
| <a class="link" href="concept_checking.html#range.concepts.concept_checking.see_also">See also</a> |
| </h5> |
| <p> |
| <a class="link" href="../style_guide.html" title="Terminology and style guidelines">Range Terminology and style guidelines</a> |
| </p> |
| <p> |
| <a href="../../../../../../libs/iterator/doc/iterator_concepts.html" target="_top">Iterator concepts</a> |
| </p> |
| <p> |
| <a href="../../../../../../libs/concept_check/index.html" target="_top">Boost Concept Check library</a> |
| </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="random_access_range.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.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="../reference.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| </body> |
| </html> |
