Just a comment that this fixes the problem.

@lindahua, is there a reason these are not exported in the latest version? I haven't looked deeply into their use, but you mentioned that you're moving away from using functors (presumably to make things easier to move into base). Are they generally easy to remove from package code?

Cheers!

Sorry to have been so late in replying to these issues, I was ill during December and also was occupied with a death in the family.

In b5b812e I committed an alternative approach which is to use the explicit types Functor{1} etc. instead of the typealiases UnaryFunctor, etc.

I should have checked for pull requests first. Any objections to staying with the current commit and closing this pull request?

I think these should be exported. Thanks.

Oh, I was considering these as a patch to NumericExtensions. @dmbates: please feel free to revert my merge if you think the original version was better.