Here the is full code example I have adapted from the aforementioned
given example. The error message thrown is
Unhandled exception at 0x7c81eb33 in Test.exe: Microsoft C++ exception:
boost::bad_any_cast @ 0x0013f63c.
If I comment out the two lines,
ifstream ifs("multiple_sources.cfg");
store(parse_config_file(ifs, config_file_options), vm);
everything works fine.
#include
namespace po = boost::program_options;
#include <fstream>
#include <iostream>
#include <iterator>
using namespace std;
int main(int ac, char* av[])
{
int compLevel = 0 ;
string inputFileName ;
int opt;
// Declare a group of options that will be
// allowed only on command line
po::options_description generic("Generic options");
generic.add_options()
("version,v", "print version string")
("help", "produce help message")
;
// Declare a group of options that will be
// allowed both on command line and in
// config file
po::options_description config("Configuration");
config.add_options()
("input-file", po::value<string>(), "input file")
("optimization", po::value<int>(&opt)->default_value(10),
"optimization level")
("include-path,I",
po::value< vector<string> >()->composing(),
"include path")
;
// Hidden options, will be allowed both on command line and
// in config file, but will not be shown to the user.
//po::options_description hidden("Hidden options");
//hidden.add_options()
// ("input-file", po::value<string>(), "input file")
// ;
po::options_description cmdline_options;
cmdline_options.add(generic).add(config);
po::options_description config_file_options;
config_file_options.add(config);
po::options_description visible("Allowed options");
visible.add(generic).add(config);
po::positional_options_description p;
p.add("input-file", -1);
po::variables_map vm;
store(po::command_line_parser(ac, av).
options(cmdline_options).positional(p).run(), vm);
if (vm.count("help")) {
cout << visible << "\n";
return 0;
}
if (vm.count("input-file"))
{
cout << "Input file is: "
<< vm["input-file"].as<string>() << "\n";
ifstream ifs("multiple_sources.cfg");
store(parse_config_file(ifs, config_file_options), vm);
//notify(vm);
}
if (vm.count("include-path"))
{
cout << "Include paths are: "
<< vm["include-path"].as<string>() << "\n";
}
cout << "Optimization level is " << opt << "\n";
return 0;
}
