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| <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="id1014760"></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="id1015121"></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> |
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| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 1998 -2010 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>) |
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