#include <boost/program_options.hpp>

namespace po = boost::program_options;

int main(int argc, char** argv)

{

	int compression;

	po::options_description desc("Allow options");

	desc.add_options()

		("help", "produce help message")

		("compression", po::value<int>(), "set compression level");

		//("help,h", "produce help message")

		//("compression", po::value<int>(&compression)->default_value(10), "set compression level");  

	po::variables_map vm;

	try

	{

		po::store(po::parse_command_line(argc, argv, desc), vm);

		po::notify(vm);

	}

	catch (...)

	{

		std::cout << "输入的参数中存在未定义的选项！\n";

		return 0;

	}

	if (vm.count("help"))

	{

		cout << desc << endl;

		return 1;

	}

	if (vm.count("compression"))

	{

		cout << "Compression level was set to " << compression << endl;

	}

	else

	{

		cout << "Compression level was not set." << endl;

	}

	return 0;

}