lexical_cast fails when src inserts 0 chars into stream.

[Eric Niebler]

The following code works with 1.46.1 but fails with a bad_lexical_cast exception on 1.48.

#include <string>
#include <iostream>
#include <boost/lexical_cast.hpp>

struct my_string
{
        friend std::ostream &operator<<(std::ostream& sout, my_string const& st)
        {
                return sout << "";
        }
};

int main()
{
        try
        {
                my_string st;
                std::string st2 = boost::lexical_cast<std::string>(st);
        }
        catch(boost::bad_lexical_cast const &e)
        {
                std::cout << e.what() << std::endl;
        }
}

[Antony Polukhin]

Duplicates #6264, #6298
Already fixed in trunk, fixes merged to 1.49.0
Tests were updated with your example

[Eric Niebler]

Sorry for the dupe! Thanks for the quick response.