Re: Hi and pushing existing UserData from pointer

[Chris Camacho <c.camacho@...>]

> Here is how to do it:
>
>   
I ended up with something different (I'm not using weak ref's
as with this particular lib I've decided its more appropriate to
"hand back" the object from the lib)

static cpBody *push_cpBody (lua_State *L) {
  cpBody *bb=cpBodyNew(0,0); // initialise later
  cpBody **pbb = (cpBody **)lua_newuserdata(L, sizeof(cpBody*));  // 
ptr to ptr
  *pbb = bb;  // Lua is only holding a pointer to the object pointer

  luaL_getmetatable(L, "cpBody");
  lua_setmetatable(L, -2);

  lua_getglobal(L,"__cpBody_ptrs");  // this table is created when 
cpBody UD is created
  lua_pushlightuserdata(L, bb);   // table index
  lua_pushvalue(L,-3); // previously created table of *cpBody pointers 
to userdata
  lua_rawset(L, -3); // update the table
  lua_pop(L,1); // restore stack

 return bb;
}

What do you think any obvious bloopers?



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