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< div class = "titlepage" >< div >< div >< h3 class = "title" >
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< a name = "boost_regex.ref.bad_expression" ></ a >< a class = "link" href = "bad_expression.html" title = "bad_expression" > bad_expression</ a >
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< a name = "boost_regex.ref.bad_expression.h0" ></ a >
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< span class = "phrase" >< a name = "boost_regex.ref.bad_expression.synopsis" ></ a ></ span >< a class = "link" href = "bad_expression.html#boost_regex.ref.bad_expression.synopsis" > Synopsis</ a >
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</ 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 >
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< p >
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The class < code class = "computeroutput" >< span class = "identifier" > regex_error</ span ></ code > defines
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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 >
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< pre class = "programlisting" >< span class = "keyword" > namespace</ span > < span class = "identifier" > boost</ span >< span class = "special" > {</ span >
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< 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 >
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< 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 >
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< h5 >
< a name = "boost_regex.ref.bad_expression.h1" ></ a >
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< span class = "phrase" >< a name = "boost_regex.ref.bad_expression.description" ></ a ></ span >< a class = "link" href = "bad_expression.html#boost_regex.ref.bad_expression.description" > Description</ a >
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</ 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 >
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< 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 >
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< span class = "bold" >< strong > Effects:</ strong ></ span > Constructs an object of class regex_error.
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</ p >
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< 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 >
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</ pre >
< p >
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< span class = "bold" >< strong > Effects:</ strong ></ span > returns the error code that represents
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parsing error that occurred.
</ p >
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< 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 >
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</ pre >
< p >
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< span class = "bold" >< strong > Effects:</ strong ></ span > returns the location in the expression
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where parsing stopped.
</ p >
< p >
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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 >
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is moot; depending upon how the library is used exceptions may be either
logic errors (programmer supplied expressions) or run time errors (user supplied
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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 >
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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
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Report on C++ Library Extensions</ a > .
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</ p >
</ div >
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< div class = "copyright-footer" > Copyright © 1998-2013 John Maddock< p >
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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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</ p >
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