garbage collection - destructors on gc-ed lua objects -

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i know lua gc-ed. know lua can deal c objects via userdata.

here question: there anyway register function it's called when c userdata object gc-ed lua? [basically destructor].

thanks!

yes, there metamethod called __gc purpose. see chapter 29 - managing resources of programming in lua (pil) more details.

the following snippet creates metatable , registers __gc metamethod callback:

  lual_newmetatable(l, "someclass");    lua_pushcfunction(l, some_class_gc_callback);   lua_setfield(l, -2, "__gc");

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