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[/
Copyright 2006-2007 John Maddock.
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt).
]
[section:bad_expression bad_expression]
[h4 Synopsis]
#include <boost/pattern_except.hpp>
The class `regex_error` 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.
namespace boost{
class regex_error : public std::runtime_error
{
public:
explicit regex_error(const std::string& s, regex_constants::error_type err, std::ptrdiff_t pos);
explicit regex_error(boost::regex_constants::error_type err);
boost::regex_constants::error_type code()const;
std::ptrdiff_t position()const;
};
typedef regex_error bad_pattern; // for backwards compatibility
typedef regex_error bad_expression; // for backwards compatibility
} // namespace boost
[h4 Description]
regex_error(const std::string& s, regex_constants::error_type err, std::ptrdiff_t pos);
regex_error(boost::regex_constants::error_type err);
[*Effects:] Constructs an object of class regex_error.
boost::regex_constants::error_type code()const;
[*Effects:] returns the error code that represents parsing error that occurred.
std::ptrdiff_t position()const;
[*Effects:] returns the location in the expression where parsing stopped.
Footnotes: the choice of `std::runtime_error` as the base class for `regex_error`
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). The library previously used `bad_pattern`
and `bad_expression` for errors, these have been replaced by the single
class `regex_error` to keep the library in synchronization with the
[tr1].
[endsect]
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