id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
1127,multi_array views do not handle negative strides correctly,news@…,Ronald Garcia,"Discovered in 1.33.1, but the code appears to be unchanged in 1.34.1.

The attached test case fails.  Compiling with FUDGED_RANGE causes the test case to work, but it shouldn't.  The problem appears to be due to generate_array_view in boost/multi_array/base.hpp; it does not correctly handle negative strides.

""len"" is incorrectly calculated in the following code, when stride (and hence index_factor) is negative:
      index index_factor = current_range.stride();
      index len = (finish - start + (index_factor - 1)) / index_factor;

I was initially unsure as to whether negative strides were supported, but it is clear from other code in base.hpp that stride sign is carefully handled, so I it should be in the view.

Phil Richards",Bugs,closed,To Be Determined,multi_array,,Problem,fixed,,