private void pushObject(Object o)
{
GCHandle gch = GCHandle.Alloc(o);
// Store the GCHandle so that it won't get garbage collected.
mLuaReferences.Add(gch);
// Push a userdata onto the stack (we don't care about the returned address)
// This is needed because we cannot create a metatable for a lightuserdata.
// So we make the light userdata a member of it's metatable.
IntPtr p = LuaDll.lua_newuserdata(L, 8);
// Write the IntPtr of the object handle to the userdata.
Marshal.WriteIntPtr(p, GCHandle.ToIntPtr(gch));
// Pushes the metatable of the given class onto the stack
pushMetatable(o.GetType());
// We should have a metatable of this object's class on the top of the stack.
// Now register the object, which is below that (-2)
// o.__metatable = mt
LuaDll.lua_setmetatable(L, -2);
// The exported object should now be on the top of the stack.
}