From: Michal Rokos <michal@...>
Date: 2001-09-17T19:41:30+09:00
Subject: [ruby-talk:21282] extensions libraries

Hello!

	I'd like to ask you for comments.

	I'm implementing some C lib binding to Ruby. I have to implement
	my class types.

	One way is:
	use Data_Wrap_Struct, ..., and struct RData add type ident to every 
	mine struct
	+ I can use existing functions
	- I have to know where ident is, but I don't know the real structure
	of struct XXX {...}; (=> type ident is always 1st record in structure)
	- I can forget to add ident to struct
	- can be messed up with other T_DATA

	2nd way:
	use mine functions for *_Wrap_Struct, ..., and struct MINE {
		struct RBasic basic;
		...
		void *data;
		unsigned long MINE_type_ident;};
	+ type ident allways included - not needed in user struct;
	- I have to rewrite all functions for creating and getting struct
	- I still need pretend for BUILTIN_TYPE(obj) T_RDATA (?? Really??)
	- if Data_*_Struct will be upgraded I have to commit changes to mine
	MINE_*_Struct (=> more work, possibility of incompabilities)

	??? Any other way?

	Please, please comment!

		Thank you!

			Michal