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LUA: Instantiating lua objects from c++ [SORTED] I think

Engines and Middleware Programming

Started by TonyFish August 03, 2004 05:37 AM

2 comments, last by TonyFish 19 years, 11 months ago

TonyFish

126

Author

August 03, 2004 05:37 AM

How can I do this in c++? Let's say I have a c++ class (baseclass) which i extend in lua (derivedclass). I'd like to create an instace of derivedclass from the c++ code. I've looked through the docs but haven't had much success. Could someone please help em with this mater. Thanks Tony [Edited by - TonyFish on August 3, 2004 11:39:36 AM]

<Fish>{

codeandroid

140

August 03, 2004 09:38 AM

You can instantiate it in a Lua VM (by executing code in the VM), but it isn't possible to create a C++ object for it (using the derived interface etc) if that's what you want to do.

Correct me if I'm wrong.

-psy

TonyFish

126

Author

August 03, 2004 09:46 AM

So I can't do something like:

a = create_new_lua_object("extended");
a.somefunc();

<Fish>{

TonyFish

126

Author

August 03, 2004 11:35 AM

I got an answer out of someone in the luabind mailinglist:

Instantiating a lua class is just a matter of calling the constructor like any other function. For example:

object my_class(get_globals(L)["my_class"]);

Since the object won't be stored anywhere in lua, you need to adopt the object. Otherwise it will be collected by lua.
i.e.

my_base* p = object_cast<my_base*>(my_class(), adopt(result));

<Fish>{