[Insight-developers] SmartPointer comparison operators

[Aljaz Noe]

> Constructing and assigning SmartPointers require a Mutex operation.
> This can be expensive in computing time.

I know. I suspected this a long time ago. That's why the whole FEM library
can be compiled either with the use of SP or not, by simply setting a flag
in CMake. If you want speed, you don't use SP. On the other hand, if you
need/want SP, you can still use them.

The previously described problems only occurred when the SP were used.

Aljaz