There is no such type as generic_request_handler_t

[eao197]

There is a type default_request_handler_t:

restinio/dev/restinio/request_handler.hpp

Lines 478 to 479 in 4d003e9

	using default_request_handler_t =
	std::function< request_handling_status_t ( request_handle_t ) >;

And there is a type generic_request_handle_t:

restinio/dev/restinio/request_handler.hpp

Lines 454 to 456 in 4d003e9

	template< typename Extra_Data >
	using generic_request_handle_t =
	std::shared_ptr< generic_request_t< Extra_Data > >;

But there is no generic_request_handler_t in a form like:

template<typename ExtraData>
using generic_request_handler_t = std::function<
   request_handling_status_t(generic_reqeuest_handle_t<ExtraData>)>;

Such a type can make usage of ExtraData simpler.