2003-05-17 11:45:48 +00:00
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<title>Boost.Regex: bad_expression</title>
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<td valign="top" width="300">
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<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
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<td width="353">
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<h1 align="center">Boost.Regex</h1>
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<h2 align="center">class bad_expression</h2>
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</td>
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<td width="50">
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<h3><a href="index.html"><img height="45" width="43" alt="Boost.Regex Index" src="uarrow.gif" border="0"></a></h3>
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<br>
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<hr>
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<h3>Synopsis</h3>
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2003-05-24 11:13:26 +00:00
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<p>#include <<a href="../../../boost/regex/pattern_except.hpp">boost/pattern_except.hpp</a>></p>
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2003-05-17 11:45:48 +00:00
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<p>The class <code>bad_expression</code> defines the type of objects thrown as
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exceptions to report errors during the conversion from a string representing a
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regular expression to a finite state machine. </p>
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<pre>
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<b>namespace</b> boost{
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<b>class</b> bad_pattern : <b>public</b> std::runtime_error
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{
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<b>public</b>:
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<b>explicit</b> bad_pattern(<b>const</b> std::string& s) : std::runtime_error(s){};
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};
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<b>class</b> bad_expression : <b>public</b> bad_pattern
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{
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<b>public</b>:
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bad_expression(<b>const</b> std::string& s) : bad_pattern(s) {}
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};
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} // namespace boost
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</pre>
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<h3>Description</h3>
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<pre>
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bad_expression(const string& what_arg);
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</pre>
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<p><b>Effects:</b> Constructs an object of class <code>bad_expression</code>.</p>
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<b></b>
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<p><b>Postcondition:</b> <code>strcmp(what(), what_arg.c_str()) == 0</code>.</p>
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<p>Footnotes: the class <i>bad_pattern</i> forms the base class for all
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pattern-matching exceptions, of which <i>bad_expression</i> is one. The choice
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of <i>std::runtime_error</i> as the base class for <i>bad_pattern</i> is moot;
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depending upon how the library is used exceptions may be either logic errors
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(programmer supplied expressions) or run time errors (user supplied
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expressions).</p>
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<p></p>
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<hr>
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<p>Revised
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<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
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17 May 2003
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<!--webbot bot="Timestamp" endspan i-checksum="39359" --></p>
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<p><i><EFBFBD> Copyright <a href="mailto:jm@regex.fsnet.co.uk">John Maddock</a> 1998-
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<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%Y" startspan -->
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2003
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<!--webbot bot="Timestamp" endspan i-checksum="39359" --></i></p>
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<p align="left"><i>Permission to use, copy, modify, distribute and sell this software
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and its documentation for any purpose is hereby granted without fee, provided
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that the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting documentation.
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Dr John Maddock makes no representations about the suitability of this software
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for any purpose. It is provided "as is" without express or implied warranty.</i></p>
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