Re: Crash in wrapper_base.cpp

Ooops, seems like I messed up my previous runs of your sample code somehow.
I do indeed have different results for the different runs and have attached
them for you.  I expect that they'll be the same as yours.  For reference,
I'm using Visual Studio 2008 on Windows 7 x64 but I'm building a 32 bit
binary.

More importantly though, I have come across 2 interesting observations.
I've been tinkering with your code and also the code in my engine and have
found a possible workaround.

First, in my engine, if I simply add the following push of self onto the
stack before calling the lua function then no crash!

        lua_State *L = m_self.state();
        m_self.get(L);
        call<void>("overide");

I find it weird that it didn't cause a stack overflow but I tried it many
times and let it run for a long time with no observed side effects other
than it seeming to be working correctly.

The second observation is that when I put the extra push of self onto the
stack into your sample code before calling overide() it caused an assert.
After digging around I saw that you didn't provide a constructor for your
lua class.  Adding that in made the assert go away and also got rid of the
"Lua instance is nil" messages.

        "function Item:__init(i)\n"
        "    print('lua constructor')\n"
        "end\n"

So it seems we may have stumbled upon a workaround if it deems to have no
side effects although I'm not really comfortable with not knowing why it
works.  Let me know what you find with your engine.

    Drew

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