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POProblem with boost::find_format_all, boost::regex_finder and custom regex formatter (bug boost 1.42)
 

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  1. POProblem with boost::find_format_all, boost::regex_finder and custom regex formatter (bug boost 1.42)
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    <p>I have a code that has been working for almost 4 years (since boost 1.33) and today I went from boost 1.36 to boost 1.42 and now I have a problem.</p> <p>I'm calling a custom formatter on a string to format parts of the string that match a REGEX.</p> <p>For instance, a string like: "abc;def:" will be changed to "abc\2Cdef\3B" if the REGEX contains "([;:])"</p> <pre><code>boost::find_format_all( mystring, boost::regex_finder( REGEX ), custom_formatter() ); </code></pre> <p>The custom formatter looks like this:</p> <pre><code>struct custom_formatter() { template&lt; typename T &gt; std::string operator()( const T &amp; s ) const { std::string matchStr = s.match_results().str(1); // perform substitutions return matchStr; } } </code></pre> <p>This worked fine but with boost 1.42 I know have "non initialized" s.match_results() which yield to boost::exception_detail::clone_implINS0_::error_info_injectorISt11logic_errorEEEE - Attempt to access an uninitialzed boost::match_results&lt;> class.</p> <p>This means that sometimes I am in the functor to format a string but there is no match.</p> <p>Am I doing something wrong? Or is it normal to enter the functor when there is no match and I should check against something?</p> <p>for now my solution is to try{}catch(){} the exception and everything works fine, but somehow that doesn't feel very good.</p> <p><strong>EDIT1</strong></p> <p>Actually I have a new empty match at the end of each string to parse.</p> <p><strong>EDIT2 : one solution inspired by ablaeul</strong></p> <pre><code> template&lt; typename T &gt; std::string operator()( const T &amp; s ) const { if( s.begin() == s.end() ) return std::string(); std::string matchStr = s.match_results().str(1); // perform substitutions return matchStr; } </code></pre> <p><strong>EDIT3 Seems to be a bug in (at least) boost 1.42</strong></p>
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