Re: [boost] Formal Review of Proposed Boost.Histogram Library Starts TODAY

On 21. Sep 2018, at 23:21, Steven Watanabe via Boost wrote:

On 09/21/2018 04:23 AM, Hans Dembinski via Boost wrote:

...

<snip> In short, for the sake of performance, it is mandatory that all axis types derive from axis::base, while deriving from iterator_mixin and axis::labeled_base should be optional.

I feel that I should point out that axis::any does not meet this requirement.

There is no need to store an axis::any inside an axis::any, therefore axis::any does not need to comply to all the AxisType concepts. Best regards, Hans