#include <iostream>
#include <iomanip>
#include <vector>
#include <boost/program_options.hpp>

using namespace std;
using namespace boost::program_options;

template<typename T>
ostream& operator<<(ostream& os, const vector<T>& v)
{
    copy(v.begin(), v.end(), ostream_iterator<T>(cout, " "));
    return os;
}

int main(int avArgc, char* apArgv[])
{
	try
	{
		// Define the allowed options.
		bool vBoolOpt;
		options_description vVisibleOpts("Visible options");
		vVisibleOpts.add_options()
		(
			"help,?", "produce help message"
		)
		(
			"bool-opt,a", value<bool>(&vBoolOpt)->implicit_value(true)->default_value(false), "a boolean option"
		);
		vector<string> vVectorOpt;
		options_description vHiddenOpts("Hidden options");
		vHiddenOpts.add_options()
		(
			"input-file", value< vector<string> >(&vVectorOpt), "input file"
		);
		positional_options_description vPositional;
		vPositional.add("input-file", -1);
		options_description vAllOpts;
		vAllOpts.add(vVisibleOpts).add(vHiddenOpts);
		options_description vAllowOpts("Allowed options");
		vAllowOpts.add(vVisibleOpts);

		// Parse and store the options.
		variables_map vVarMap;
		store(command_line_parser(avArgc, apArgv).options(vAllOpts).positional(vPositional).run(), vVarMap);
		notify(vVarMap);

		// Display help or the value of the options.
		if (vVarMap.count("help") != 0)
		{
			cout << vAllowOpts << endl;
		}
		else
		{
			cout << "vBoolOpt = " << boolalpha << vBoolOpt << endl;
			cout << "vVectorOpt = " << vVectorOpt << endl;
		}
	}
	catch (exception& e)
	{
		cout << e.what() << endl;
		return 1;
	}
	return 0;
}