On 11/29/11 19:46, Brian Davis wrote:
Something else I noticed:
array_type::array_view<3>:: type row_2 = a_3d_array[ boost::indices[range(0, z_dim)][range(1,1)][range(0,0)] ];
was perfectly acceptable from a boost::multi_array ... why? dimensions of zero thickness should not be allowed. That is the ranges range(1,1) and range(0,0) should not be allowed imho. Of course if I can enter the zeroth dimenson of infintesmal thickness then all would be good.
If a multi_array with 0 elements is not allowed, then a std::list<T> with no elements should not be allowed. To be more concrete, imagine: multi_array<T,2> maT(extents[n1][n2]; The std::list counterpart would be: std::list<std::list> lT; where lT.size()==n1, and for any 0<i<lT.size(), lT[i].size()=n2. Now, the constraint that all the dimensions of maT must be >0 would mean that in the counterpart lT, all the lT[i].size() would have to be n2 and n2>0. Now why couldn't all the lT[i].size() be 0. That's certainly possible. If it's possible for lT, why not for maT? -regards, Larry