Re: [Boost-bugs] [Boost C++ Libraries] #11650: boost range size() fails concept on subarray of a const multi_array

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #11650: boost range size() fails concept on subarray of a const multi_array
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2015-09-14 15:21:34

#11650: boost range size() fails concept on subarray of a const multi_array
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  Reporter:  John Reid <johnbaronreid@…>  |      Owner:  neilgroves
      Type:  Bugs                         |     Status:  new
 Milestone:  To Be Determined             |  Component:  range
   Version:  Boost 1.59.0                 |   Severity:  Problem
Resolution:                               |   Keywords:
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Comment (by neilgroves):

 It appears that the multi_array const_sub_array is not a valid model of a
 RandomAccessRange Concept because the iterator type id not defined.

 A change to multi_array could make it work, I see two possibilities:
 1. Implement const_sub_array::iterator to be equal to
 const_sub_array::const_iterator. This has been done in Boost.Range
 sub_range without issue for sometime. This is semantically very similar
 since it needs to preserve constant-ness from a template parameter.
 2. The multi_array could have a specialization of boost::range_iterator to
 avoid using the default Boost.Range iterator type deduction.

 My recommendation would be 1.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11650#comment:1>
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