Re: [Boost-users] Boost.MultiArray + iterators

From: Ronald Garcia (garcia_at_[hidden])
Date: 2005-11-14 10:47:39

Hi Dennis,

Glad to hear that the patch worked.  I have applied it to the Boost CVS 
repository as well.  Thanks for the verification.

Cheers,
ron

On Nov 12, 2005, at 11:12 PM, Dennis Zickefoose wrote:

> That worked great.  Thanks a million.
>
> DZJr
>
> Ronald Garcia wrote:
>> Hi Dennis,
>>
>> I don't have access to VC++ 7.1 at the moment and cannot recreate the
>> error you are seeing on my platform.  Could you try applying the
>> following patch to boost/multi_array/types.hpp and let me know if this
>> does the trick?
>>
>> Thanks,
>> ron
>>
>>
>> *** types.hpp	01 Dec 2003 14:07:10 -0500	1.3
>> --- types.hpp	12 Nov 2005 10:19:48 -0500	
>> ***************
>> *** 26,32 ****
>>
>>    // needed typedefs
>>    typedef std::size_t size_type;
>> ! typedef int index;
>>
>>    } // namespace multi_array
>>    } // namespace detail
>> --- 26,32 ----
>>
>>    // needed typedefs
>>    typedef std::size_t size_type;
>> ! typedef std::ptrdiff_t index;
>>
>>    } // namespace multi_array
>>    } // namespace detail
>>
>>
>>
>> On Nov 6, 2005, at 1:29 AM, Dennis Zickefoose wrote:
>>
>>> 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
>>>
>>> _______________________________________________
>>> Boost-users mailing list
>>> Boost-users_at_[hidden]
>>> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>
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