Function print_error

src/error_code.cpp:362–369

	}

	std::string print_error(error_code const& ec)
	{
		if (!ec) return {};
		std::stringstream ret;
		ret << "ERROR: (" << ec.category().name() << ":" << ec.value() << ") "
			<< ec.message();
		return ret.str();
	}

}