Re: [boost] [iterator][range] BoostIteratorTraversalConcepts-aware boost::advance/distance

On 6/28/2017 4:03 PM, Michel Morin via Boost wrote:

Hi,

The Boost iterator traversal concepts have not been adopted by the C++ Standard. Because of this, some of RandomAccessTraversalIterators (Boost's concepts) are treated as InputIterators (Standard's concepts) by the stdlib.

IMHO, Boost.Iterator should provide BoostIteratorTraversalConcepts-aware `boost::advance` and `boost::distance` to avoid the inefficiencies. However, neither of them are implemented. (Boost.Range has `boost::distance` for ranges, but it just calls `std::distance`.)

I'm attaching files that implement `boost::advance` and `boost::distance`. Would these functions be useful additions?

Please create a PR.

Regards, Michel