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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 <<a href="../../../boost/regex/pattern_except.hpp">boost/pattern_except.hpp</a>></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. </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& 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& s) : bad_pattern(s) {}
};
} // namespace boost
</pre>
<h3>Description</h3>
<pre>
bad_expression(const string& 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>
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<p>Revised
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
24 Oct 2003
<!--webbot bot="Timestamp" endspan i-checksum="39359" --></p>
<p><i> Copyright John Maddock 1998-
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%Y" startspan -->
2003<!--webbot bot="Timestamp" endspan i-checksum="39359" --></i></p>
<P><I>Use, modification and distribution are subject to the Boost Software License,
Version 1.0. (See accompanying file <A href="../../../LICENSE_1_0.txt">LICENSE_1_0.txt</A>
or copy at <A href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>)</I></P>
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