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- Subject: Re: [tolua++] support multiple inehritance
- From: David Given <dg@...>
- Date: Sat, 1 Oct 2005 00:42:03 +0100
On Friday 30 September 2005 23:23, Mildred wrote:
> Is it possible to have multiple inehritance with tolua++ w/o using
> syntax like:
This depends very much on how you build your OO system.
The system I tend to use involves physically copying the methods from the
superclass object to the subclass object when subclassing --- I believe this
is the most common approach. This allows very easy multiple inheritance
because you can copy an arbitrary number of superclass objects. However, this
doesn't allow subclasses to reflect changes to the superclass object once
Another system I know of, which I haven't used and so might get completely
wrong, involves having a chain of class objects each of whose metatable's
__index field points at the superclass. This *doesn't* allow multiple
inheritance unless you have a class whose __index field contains a dispatch
routine that searches multiple classes... and this approach is slow enough as
And I have *no idea* if you can do multiple inheritance using a closure-based
OO system (see http://thread.gmane.org/gmane.comp.lang.lua.general/12344) ---
I suspect not.
BTW, has anybody done a formal collection and comparison of all the various
Lua OO mechanisms? Because, er, there are rather a lot!
+- David Given --McQ-+ "Hydrogen fusion, the sun makes shine
| firstname.lastname@example.org | Vascular pressure makes the ivy twine.
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