Storing global userdata in Lua 4

[Markus Ewald <Markus_Ewald@...>]

Hello Again!

In Lua 3.1 I used the following code to store a pointer to a class in a 
lua_State

 // Store pointer to class in Lua
 int nTag = lua_newtag(m_pLuaState);
 lua_pushusertag(m_pLuaState, this, nTag);
 lua_setglobal(m_pLuaState, "_CMyClassPtr");

 // Retrieve pointer again
 lua_getglobal(pLuaState, "_CMyClassPtr");
 CMyClass *pThis = static_cast<CMyClass *>(lua_touserdata(pLuaState, -1));


Now I tried to convert this code to Lua 4.0

 // Store pointer to class in Lua
 *static_cast<CMyClass **>(lua_newuserdata(m_pLuaState, sizeof(this))) 
= this;
 lua_setglobal(m_pLuaState, "_CMyClassPtr");

 // Retrieve pointer again
 lua_getglobal(pLuaState, "_CMyClassPtr");
 CMyClass *pThis = *static_cast<CMyClass **>(lua_touserdata(pLuaState, 
-1));


It doesn't seem to clean to me to allow the script to modify the pointer 
at will.
Is there a better (and maybe quicker) way to do it (it's always just a 
single pointer) ?
What about Lua 4.1w ?

-Markus-