#include <boost/filesystem.hpp>
boost::optional<std::string> get_from_zip_url (std::string url, std::string file, boost::function<void (boost::filesystem::path)> load);
#include <boost/filesystem.hpp>
boost::optional<std::string> get_from_zip_url (std::string url, std::string file, boost::function<void (boost::filesystem::path)> load);