Why are functions like BatchEncoder::encode or Evaluator::add not const?

[AlexanderViand]

I was surprised to see that functions like BatchEncoder::encode/decode or Evaluator::add aren't declared const. Do some of them actually modify the Encoder/Evaluator object?

If not, I'd be happy to submit a PR where they are all set as const, since the lack of const-ness makes it a bit of a pain to write "nice" code against SEAL that needs to create new ctxts/ptxts.

[AlexanderViand]

Trying it just now, it seems like adding the const qualifiers does work. Will submit a PR.

[WeiDaiWD]

Thanks, Alex! It will appear in the next release soon.