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

std::vector<std::shared_ptr<Title>> db_query_12(
	const database_t& database,
	const Actor& actor
);

void db_query_13(
	const database_t& database,
	unsigned short year,
	std::ostream& stream = std::cout
);

int db_query_14(
	const database_t& database,
	Type type,
	const std::string& genre
);

size_t db_query_15(
	const database_t& database,
	const std::string& genre
);

void db_query_16(
	const database_t& database,
	unsigned short begin,
	unsigned short end,
	std::ostream& stream = std::cout
);

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