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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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< / h3 > < / div > < / div > < / div >
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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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< / pre >
< 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 >
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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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