ENH: simpler, more consistent checks for tmp validity (#1775)
- Previously considered to be valid() if it was any reference (null or non-null) or a non-null pointer. This appears to be a holdover from old code (pre-2015) where reinterpret_cast<..>(0) was used instead of the NullObject. A reference via a null pointer isn't really possible anywhere. Even for things like labelList::null(), they now use the NullObject, which has a non-zero memory location. - now simply check for a non-zero memory address. Regardless of pointer or referenced object.
Showing with 12 additions and 12 deletions