Ticket #4656: failbit.cpp

#include <iostream>
#include <fstream>
#include <boost/program_options.hpp>

namespace po = boost::program_options ;
int main(int argc, char **argv)
{
        std::ifstream file ;
        file.exceptions(std::ifstream::failbit | std::ifstream::badbit) ;
        po::options_description options_ ;

        try
        {
                file.open("test.cfg") ;
                std::cout << "opening test.cfg: failbit: " << file.fail() << " - badbit: " << file.bad() << std::endl ;
                std::cout << "let s call parse_config_file()..." << std::endl ;
                po::parse_config_file(file, options_) ;
        }
        catch(std::ios::failure const & exc)
        {
                std::cout << "ios failure: failbit: " << file.fail() << " - badbit: " << file.bad() << std::endl ;
                std::cout << "perror() value : " << std::flush ;
                perror("test.cfg") ;
        }
}