Container insertion and removal

[Steve Teale]

>> Sounds good?
> 
> How can softRemove not affect iterating ranges?  What if the range is
> positioned on the element removed?
> 
> The only two containers that would support softInsert would be linked
> list and sorted map/set.  Anything else might completely screw up the
> iteration.  I don't see a lot of "generic" use for it.
> 
> Another option is to use a "mutation" field that is checked every chance
> by the range.  If it changes, then the range is invalidated.
> 
> -Steve

Steve,

Wouldn't the soft things throw (or maybe just nudge) an exception if the 
container was in a state where the soft option was not appropriate.

That would be the other way round to what you said, The container would 
note when some range operation had a conflicting currency.

Steve