Re: [Boost-bugs] [Boost C++ Libraries] #7704: lexical_cast to filesystem::path fails for string::length > 22

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #7704: lexical_cast to filesystem::path fails for string::length > 22
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-12-01 18:45:32

#7704: lexical_cast to filesystem::path fails for string::length > 22
-----------------------------------------------------+----------------------
  Reporter:  Braden McDaniel <braden@…>              |       Owner:  apolukhin   
      Type:  Bugs                                    |      Status:  new         
 Milestone:  To Be Determined                        |   Component:  lexical_cast
   Version:  Boost 1.52.0                            |    Severity:  Problem     
Resolution:                                          |    Keywords:              
-----------------------------------------------------+----------------------

Comment (by apolukhin):

 Please, try this one:
 {{{

 #include <sstream>
 #include <boost/filesystem/path.hpp>
 #include <boost/lexical_cast.hpp>

 template< class BufferType >
 class stl_buf_unlocker: public BufferType{
 public:
     typedef BufferType base_class;
     using base_class::pptr;
     using base_class::pbase;
     using base_class::setg;
     using base_class::setp;
 };

 typedef stl_buf_unlocker<std::basic_stringbuf<char> > unlocked_but_t;

 int main()
 {
     char data[] = "aaaaaaaaaaaaaaaaaaaaaaa";
     char* start = data;
     char* finish = start + sizeof(data);

     std::basic_istringstream<char> stream;
     static_cast<unlocked_but_t*>(stream.rdbuf())->setg(start, start,
 finish);

     stream.unsetf(std::ios::skipws);

     std::string output;
     // boost::filesystem::path output;

     const bool b1 = (stream >> output);
     const bool b2 = (stream.get() == std::char_traits<char>::eof());

     BOOST_ASSERT(b1);
     BOOST_ASSERT(b2);

     return 0;
 }

 }}}

 If it does not trigger asserts, then comment `std::string output;` and
 uncomment `boost::filesystem::path output;` and try it once more.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7704#comment:6>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.