1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>bad_expression</title> 5<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../index.html" title="Boost.Regex 5.1.4"> 8<link rel="up" href="../ref.html" title="Reference"> 9<link rel="prev" href="regex_token_iterator.html" title="regex_token_iterator"> 10<link rel="next" href="syntax_option_type.html" title="syntax_option_type"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="regex_token_iterator.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../ref.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="syntax_option_type.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h3 class="title"> 27<a name="boost_regex.ref.bad_expression"></a><a class="link" href="bad_expression.html" title="bad_expression">bad_expression</a> 28</h3></div></div></div> 29<h5> 30<a name="boost_regex.ref.bad_expression.h0"></a> 31 <span class="phrase"><a name="boost_regex.ref.bad_expression.synopsis"></a></span><a class="link" href="bad_expression.html#boost_regex.ref.bad_expression.synopsis">Synopsis</a> 32 </h5> 33<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> 34</pre> 35<p> 36 The class <code class="computeroutput"><span class="identifier">regex_error</span></code> defines 37 the type of objects thrown as exceptions to report errors during the conversion 38 from a string representing a regular expression to a finite state machine. 39 </p> 40<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span> 41 42<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> 43<span class="special">{</span> 44<span class="keyword">public</span><span class="special">:</span> 45 <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> 46 <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> 47 <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> 48 <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> 49<span class="special">};</span> 50 51<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> 52<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> 53 54<span class="special">}</span> <span class="comment">// namespace boost</span> 55</pre> 56<h5> 57<a name="boost_regex.ref.bad_expression.h1"></a> 58 <span class="phrase"><a name="boost_regex.ref.bad_expression.description"></a></span><a class="link" href="bad_expression.html#boost_regex.ref.bad_expression.description">Description</a> 59 </h5> 60<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> 61<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> 62</pre> 63<p> 64 <span class="bold"><strong>Effects:</strong></span> Constructs an object of class regex_error. 65 </p> 66<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> 67</pre> 68<p> 69 <span class="bold"><strong>Effects:</strong></span> returns the error code that represents 70 parsing error that occurred. 71 </p> 72<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> 73</pre> 74<p> 75 <span class="bold"><strong>Effects:</strong></span> returns the location in the expression 76 where parsing stopped. 77 </p> 78<p> 79 Footnotes: the choice of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span></code> 80 as the base class for <code class="computeroutput"><span class="identifier">regex_error</span></code> 81 is moot; depending upon how the library is used exceptions may be either 82 logic errors (programmer supplied expressions) or run time errors (user supplied 83 expressions). The library previously used <code class="computeroutput"><span class="identifier">bad_pattern</span></code> 84 and <code class="computeroutput"><span class="identifier">bad_expression</span></code> for errors, 85 these have been replaced by the single class <code class="computeroutput"><span class="identifier">regex_error</span></code> 86 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 87 Report on C++ Library Extensions</a>. 88 </p> 89</div> 90<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 91<td align="left"></td> 92<td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p> 93 Distributed under the Boost Software License, Version 1.0. (See accompanying 94 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>) 95 </p> 96</div></td> 97</tr></table> 98<hr> 99<div class="spirit-nav"> 100<a accesskey="p" href="regex_token_iterator.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../ref.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="syntax_option_type.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 101</div> 102</body> 103</html> 104
