Re: [TCLCORE] Empty list is not a list -- using twoPtrValue for NULL type

[Joe E. <jen...@fl...>]

miguel wrote:
> 
> Before setting the mutable flag on an empty list, you can force 
> shimmering to listType using tclListType's setFromAnyProc. After that 
> you have a List internal rep, and you can do your thing.
> 
> If this is a completely new empty list, a call to Tcl_NewListObj(1,NULL) 
> will give you back an empty list with List internal rep - empty but with 
> enough space allocated for 1 element.

Also note that, while this might work today, there is absolutely 
no guarantee that it will continue to work tomorrow.  

Beware.


--JE
  
  (bitten by this sort of thing a time or two in the past)