<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>charT Requirements</title> <link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.74.0"> <link rel="home" href="../../../index.html" title="Boost.Regex"> <link rel="up" href="../concepts.html" title="Concepts"> <link rel="prev" href="../concepts.html" title="Concepts"> <link rel="next" href="traits_concept.html" title="Traits Class Requirements"> </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="../concepts.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="traits_concept.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section" lang="en"> <div class="titlepage"><div><div><h4 class="title"> <a name="boost_regex.ref.concepts.charT_concept"></a><a class="link" href="charT_concept.html" title="charT Requirements"> charT Requirements</a> </h4></div></div></div> <p> Type <code class="computeroutput"><span class="identifier">charT</span></code> used a template argument to class template <a class="link" href="../basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>, must have a trivial default constructor, copy constructor, assignment operator, and destructor. In addition the following requirements must be met for objects; <span class="emphasis"><em>c</em></span> of type <code class="computeroutput"><span class="identifier">charT</span></code>, <span class="emphasis"><em>c1</em></span> and <span class="emphasis"><em>c2</em></span> of type <code class="computeroutput"><span class="identifier">charT</span> <span class="keyword">const</span></code>, and <span class="emphasis"><em>i</em></span> of type <code class="computeroutput"><span class="keyword">int</span></code>: </p> <div 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> Assertion / Note / Pre- / Post-condition </p> </th> </tr></thead> <tbody> <tr> <td> <p> charT c </p> </td> <td> <p> charT </p> </td> <td> <p> Default constructor (must be trivial). </p> </td> </tr> <tr> <td> <p> charT c(c1) </p> </td> <td> <p> charT </p> </td> <td> <p> Copy constructor (must be trivial). </p> </td> </tr> <tr> <td> <p> c1 = c2 </p> </td> <td> <p> charT </p> </td> <td> <p> Assignment operator (must be trivial). </p> </td> </tr> <tr> <td> <p> c1 == c2 </p> </td> <td> <p> bool </p> </td> <td> <p> true if c1 has the same value as c2. </p> </td> </tr> <tr> <td> <p> c1 != c2 </p> </td> <td> <p> bool </p> </td> <td> <p> true if c1 and c2 are not equal. </p> </td> </tr> <tr> <td> <p> c1 < c2 </p> </td> <td> <p> bool </p> </td> <td> <p> true if the value of c1 is less than c2. </p> </td> </tr> <tr> <td> <p> c1 > c2 </p> </td> <td> <p> bool </p> </td> <td> <p> true if the value of c1 is greater than c2. </p> </td> </tr> <tr> <td> <p> c1 <= c2 </p> </td> <td> <p> bool </p> </td> <td> <p> true if c1 is less than or equal to c2. </p> </td> </tr> <tr> <td> <p> c1 >= c2 </p> </td> <td> <p> bool </p> </td> <td> <p> true if c1 is greater than or equal to c2. </p> </td> </tr> <tr> <td> <p> intmax_t i = c1 </p> </td> <td> <p> int </p> </td> <td> <p> charT must be convertible to an integral type. </p> <p> Note: type charT is not required to support this operation, if the traits class used supports the full Boost-specific interface, rather than the minimal standardised-interface (see traits class requirements below). </p> </td> </tr> <tr> <td> <p> charT c(i); </p> </td> <td> <p> charT </p> </td> <td> <p> charT must be constructable from an integral type. </p> </td> </tr> </tbody> </table></div> </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 © 1998 -2007 John Maddock<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="../concepts.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="traits_concept.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>