<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>bad_expression</title> <link rel="stylesheet" href="../../../../../../doc/html/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="../ref.html" title="Reference"> <link rel="prev" href="regex_token_iterator.html" title="regex_token_iterator"> <link rel="next" href="syntax_option_type.html" title="syntax_option_type"> </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="regex_token_iterator.html"><img src="../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../ref.html"><img src="../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="syntax_option_type.html"><img src="../../../../../../doc/html/images/next.png" alt="Next"></a> </div> <div class="section" lang="en"> <div class="titlepage"><div><div><h3 class="title"> <a name="boost_regex.ref.bad_expression"></a><a class="link" href="bad_expression.html" title="bad_expression"> bad_expression</a> </h3></div></div></div> <a name="boost_regex.ref.bad_expression.synopsis"></a><h5> <a name="id889187"></a> <a class="link" href="bad_expression.html#boost_regex.ref.bad_expression.synopsis">Synopsis</a> </h5> <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">pattern_except</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> </pre> <p> The class <code class="computeroutput"><span class="identifier">regex_error</span></code> defines the type of objects thrown as exceptions to report errors during the conversion from a string representing a regular expression to a finite state machine. </p> <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span> <span class="keyword">class</span> <span class="identifier">regex_error</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span> <span class="special">{</span> <span class="keyword">public</span><span class="special">:</span> <span class="keyword">explicit</span> <span class="identifier">regex_error</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">error_type</span> <span class="identifier">err</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span> <span class="identifier">pos</span><span class="special">);</span> <span class="keyword">explicit</span> <span class="identifier">regex_error</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">error_type</span> <span class="identifier">err</span><span class="special">);</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">error_type</span> <span class="identifier">code</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span> <span class="identifier">position</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span> <span class="special">};</span> <span class="keyword">typedef</span> <span class="identifier">regex_error</span> <span class="identifier">bad_pattern</span><span class="special">;</span> <span class="comment">// for backwards compatibility </span><span class="keyword">typedef</span> <span class="identifier">regex_error</span> <span class="identifier">bad_expression</span><span class="special">;</span> <span class="comment">// for backwards compatibility </span> <span class="special">}</span> <span class="comment">// namespace boost </span></pre> <a name="boost_regex.ref.bad_expression.description"></a><h5> <a name="id889552"></a> <a class="link" href="bad_expression.html#boost_regex.ref.bad_expression.description">Description</a> </h5> <pre class="programlisting"><span class="identifier">regex_error</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">error_type</span> <span class="identifier">err</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span> <span class="identifier">pos</span><span class="special">);</span> <span class="identifier">regex_error</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">error_type</span> <span class="identifier">err</span><span class="special">);</span> </pre> <p> <span class="bold"><strong>Effects:</strong></span> Constructs an object of class regex_error. </p> <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">error_type</span> <span class="identifier">code</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span> </pre> <p> <span class="bold"><strong>Effects:</strong></span> returns the error code that represents parsing error that occurred. </p> <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span> <span class="identifier">position</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span> </pre> <p> <span class="bold"><strong>Effects:</strong></span> returns the location in the expression where parsing stopped. </p> <p> Footnotes: the choice of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span></code> as the base class for <code class="computeroutput"><span class="identifier">regex_error</span></code> is moot; depending upon how the library is used exceptions may be either logic errors (programmer supplied expressions) or run time errors (user supplied expressions). The library previously used <code class="computeroutput"><span class="identifier">bad_pattern</span></code> and <code class="computeroutput"><span class="identifier">bad_expression</span></code> for errors, these have been replaced by the single class <code class="computeroutput"><span class="identifier">regex_error</span></code> to keep the library in synchronization with the <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">Technical Report on C++ Library Extensions</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 © 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="regex_token_iterator.html"><img src="../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../ref.html"><img src="../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="syntax_option_type.html"><img src="../../../../../../doc/html/images/next.png" alt="Next"></a> </div> </body> </html>