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John Maddock
2003-05-17 11:45:48 +00:00
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>Boost.Regex: bad_expression</title>
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<h1 align="center">Boost.Regex</h1>
<h2 align="center">class bad_expression</h2>
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<h3>Synopsis</h3>
<p>#include &lt;<a href="../../boost/regex/pattern_except.hpp">boost/pattern_except.hpp</a>&gt;</p>
<p>The class <code>bad_expression</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.&nbsp;&nbsp;</p>
<pre>
<b>namespace</b> boost{
<b>class</b> bad_pattern : <b>public</b> std::runtime_error
{
<b>public</b>:
<b>explicit</b> bad_pattern(<b>const</b> std::string&amp; s) : std::runtime_error(s){};
};
<b>class</b> bad_expression : <b>public</b> bad_pattern
{
<b>public</b>:
bad_expression(<b>const</b> std::string&amp; s) : bad_pattern(s) {}
};
} // namespace boost
</pre>
<h3>Description</h3>
<pre>
bad_expression(const string&amp; what_arg);
</pre>
<p><b>Effects:</b> Constructs an object of class <code>bad_expression</code>.</p>
<b></b>
<p><b>Postcondition:</b> <code>strcmp(what(), what_arg.c_str()) == 0</code>.</p>
<p>Footnotes: the class <i>bad_pattern</i> forms the base class for all
pattern-matching exceptions, of which <i>bad_expression</i> is one. The choice
of <i>std::runtime_error</i> as the base class for <i>bad_pattern</i> 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).</p>
<p></p>
<hr>
<p>Revised
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
17 May 2003
<!--webbot bot="Timestamp" endspan i-checksum="39359" --></p>
<p><i><EFBFBD> Copyright <a href="mailto:jm@regex.fsnet.co.uk">John Maddock</a>&nbsp;1998-
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%Y" startspan -->
2003
<!--webbot bot="Timestamp" endspan i-checksum="39359" --></i></p>
<p align="left"><i>Permission to use, copy, modify, distribute and sell this software
and its documentation for any purpose is hereby granted without fee, provided
that the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting documentation.
Dr John Maddock makes no representations about the suitability of this software
for any purpose. It is provided "as is" without express or implied warranty.</i></p>
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