#include <string>
#include <iostream>

#include <boost/exception.hpp>
#include <boost/lexical_cast.hpp>

typedef boost::error_info<struct os_error_info_tag, int> os_error_info_base;

class os_error_info : public os_error_info_base
{
public:
	os_error_info(int const& err_code)
		: os_error_info_base(err_code) {}

private:
	std::string value_as_string() const
		{return "Error code: " + boost::lexical_cast<std::string> (value());}
};

int main(int argc, char* argv[])
{
	try
	{
		throw boost::enable_error_info(std::exception("value_as_string test")) <<
			os_error_info(10);
	}
	catch (boost::exception const& ex)
	{
		std::cerr << boost::diagnostic_information(ex) << std::endl;
	}

//	std::cin.get();
	return 0;
}