[boost] [histogram] Finalising version for submission

Subject: [boost] [histogram] Finalising version for submission
From: Hans Dembinski (hans.dembinski_at_[hidden])
Date: 2018-10-22 13:25:35

Hi all,

I have a general question regarding the submission process on how to deal with extensions of the library. I am currently working on the points raised in the review. Clearly, the bugs need to be fixed and the documentation improved where it was lacking. So the procedure is clear in that regard, but the final version to be included in Boost will also have more features, the main ones are:

- support for profiles and in general arbitrary accumulators as bin "counter" types - in particular any Boost.Accumulator
- allow arbitrary metadata (or no metadata at all) to be associated with the builtin axes types, instead of just supporting a string label (the metadata type will be a template parameter)
- use axis types through a traits-interface to make adding custom axis types really easy (a minimal axis only needs to implement `int operator()(something) const` and `unsigned size() const`, everything else is optional)
- use storage types through a traits-interface to allow arbitrary STL and Boost containers as storage backends
- add a support library for typical calculations done with histograms, like reducing a high-dimensional histogram to a lower-dimensional histogram, shrink an axis, etc
- growing axes that increase the number of bins while the histogram is filled

I started working on these features and switching to C++14 would simplify the implementation a lot, thanks to generic lambdas and return type deduction. So I would like to raise the requirement for the final library from C++11 to C++14.

Since these are substantial changes, is another formal review of the final version required? In any case, I will request informal feedback on the final version on the list before histogram is released with Boost for the first time.

Best regards,
Hans