From: Tomasz Wegrzanowski <taw@...>
Date: 2001-12-28T09:22:17+09:00
Subject: [ruby-talk:29494] C extensions to Ruby: classes vs. types

I have problems with Ruby classes in C

"Programming Ruby: The Pragmatic Programmer's Guide" says:

You can check to see what type of structure is used for a particular VALUE in a number of ways.
The macro TYPE(obj) will return a constant representing the C type of the given object:
T_OBJECT, T_STRING, and so on. Constants for the built-in classes are defined in ``ruby.h''.
Note that the type we are referring to here is an implementation detail---
it is not the same as the class of an object.

And I'm confused.
Is there any document where type vs. class is explained in details ?

I want to do something like that:

static VALUE myclass_mymethod(VALUE self, VALUE arg)
{
	VALUE ac = arg->class;
	VALUE result;

	     if (ac.instanceof?(CLASS1)
		{ result action1; }
	else if (ac.kindof?(CLASS2))
		{ result = action2; }
	else
		{ throw exception }
	return result;
}