// -----------------------------------------------------------------------------

void db_index_titles_by_names(
	const std::vector<std::shared_ptr<Title>>& db,
	std::map<std::string, std::shared_ptr<Title>>& index
);

void db_index_actors_by_years(
	const std::vector<std::shared_ptr<Title>>& db,
	std::map<unsigned short, std::set<Actor>>& index
);

void db_index_titles_by_years(
	const std::vector<std::shared_ptr<Title>>& db,
	std::multimap<unsigned short, std::shared_ptr<Title>>& index
);

void db_index_titles_by_actors(
	const std::vector<std::shared_ptr<Title>>& db,
	std::unordered_multimap<Actor, std::shared_ptr<Title>>& index
);

void db_index_cast_by_genres(
	const std::vector<std::shared_ptr<Title>>& db,
	std::multimap<std::tuple<std::string, unsigned short>, std::tuple<std::string, std::string, std::shared_ptr<Title>>>& index
);

// -----------------------------------------------------------------------------

void db_query_5(
	const std::map<std::string, std::shared_ptr<Title>>& index,
	const std::string& name,
	std::ostream& stream = std::cout
);

void db_query_6(
	const std::map<unsigned short, std::set<Actor>>& index,
	unsigned short begin,
	unsigned short end,
	std::ostream& stream = std::cout
);

void db_query_7(
	const std::multimap<unsigned short, std::shared_ptr<Title>>& index,
	unsigned short year,
	std::ostream& stream = std::cout
);

void db_query_8(
	const std::multimap<unsigned short, std::shared_ptr<Title>>& index,
	unsigned short begin,
	unsigned short end,
	std::ostream& stream = std::cout
);

void db_query_9(
	const std::vector<std::shared_ptr<Title>>& db,
	const std::function<bool(const Title*)>& predicate,
	std::ostream& stream = std::cout
);

std::vector<Title*> db_query_10(
	const std::unordered_multimap<Actor, std::shared_ptr<Title>>& index,
	const std::string& surname
);

std::vector<std::string> db_query_11(
	const std::multimap<std::tuple<std::string, unsigned short>, std::tuple<std::string, std::string, std::shared_ptr<Title>>>& index,
	const std::string& genre,
	unsigned short year
);

// -----------------------------------------------------------------------------