I have a simple two dimensional multi_array that I am trying to copy a row out of. This works, but I get a warning about a type conversion that I would like to get rid of. Example: boost::multi_array<double, 2> array(boost::extents[42][42]); std::vector<double> row(array[0].begin(), array[0].end()); This produces the following warning in VC++ 7.1: c:\Boost\include\boost-1_33\boost\multi_array\iterator.hpp(149) : warning C4244: '+=' : conversion from 'boost::detail::multi_array::array_iterator<T,TPtr,NumDims,Reference>::difference_type' to 'boost::detail::multi_array::array_iterator<T,TPtr,NumDims,Reference>::index', possible loss of data This is followed by a long string of support messages that ultimately point to the vector initialization. Yet the vector is successfully initialized with the range of values I expect. So what am I doing wrong here? I understand that [array.begin(), array.end()) is actually a range of sub-views, rather than a range of values...is this a side effect of this distinction? At the moment, I have replaced that with &array[0][0] to avoid the warning, but if possible I would like to go with the more reliable iterator interface in the future. Any suggestions/advice would be greatly appreciated. DZJr