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merged changes in regex5 branch

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[SVN r26692]
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John Maddock
2005-01-13 17:06:21 +00:00
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<title>Boost.Regex: bad_expression</title>
<title>Boost.Regex: regex_error</title>
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<h1 align="center">Boost.Regex</h1>
<h2 align="center">class bad_expression</h2>
<h2 align="center">class regex_error</h2>
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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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<hr>
<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
<p>The class <code>regex_error</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>class</b> regex_error : <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) {}
<b>explicit</b> regex_error(<b>const</b> std::string& s, <a href="error_type.html">regex_constants::error_type err</a>, std::ptrdiff_t pos);
<b>explicit</b> regex_error(<a href="error_type.html">boost::regex_constants::error_type err</a>);
<a href="error_type.html">boost::regex_constants::error_type</a> code()<b>const</b>;
std::ptrdiff_t position()<b>const</b>;
};
typedef regex_error bad_pattern; // for backwards compatibility
typedef regex_error bad_expression; // for backwards compatibility
} // 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>
regex_error(<b>const</b> std::string& s, <a href="error_type.html">regex_constants::error_type</a> err, std::ptrdiff_t pos);
regex_error(<a href="error_type.html">boost::regex_constants::error_type err</a>);</pre>
<p><b>Effects:</b> Constructs an object of class <code>regex_error</code>.</p>
<pre>
<a href="error_type.html">boost::regex_constants::error_type</a> code()<b>const</b>;</pre>
<p><b>Effects:</b> returns the error code that represents parsing error that occurred.</p>
<pre>
std::ptrdiff_t position()<b>const</b>; </pre>
<p><b>Effects:</b> returns the location in the expression where parsing stopped.</p>
<P>Footnotes: the choice of <code>std::runtime_error</code> as the base class for <code>
regex_error</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).&nbsp; The library previously used <code>bad_pattern</code>
and <code>bad_expression</code> for errors, these have been replaced by the
single class <code>regex_error</code> to keep the library in synchronization
with the standardization proposal.</P>
<p></p>
<hr>
<p>Revised
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
24 Oct 2003
24&nbsp;June 2004&nbsp;
<!--webbot bot="Timestamp" endspan i-checksum="39359" --></p>
<p><i><EFBFBD> Copyright John Maddock&nbsp;1998-
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%Y" startspan -->
2003<!--webbot bot="Timestamp" endspan i-checksum="39359" --></i></p>
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%Y" startspan --> 2004<!--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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