Re: [Boost-users] multi_array iteration problem

Subject: Re: [Boost-users] multi_array iteration problem
From: Ronald Garcia (rxg_at_[hidden])
Date: 2012-06-19 10:52:57

Hi Petros,

On Jun 18, 2012, at 7:54 PM, Petros wrote:

> Hi,
> I would greatly appreciate your help with this, as I have spent considerable time and have run out of ideas:
> In the following piece of code, I want to recursively visit the elements of a 4-dimensional array.
> If all the dimensions are the same, there is no problem.
> However, if there is a dimension of different length the program crashes !
> TIA,
> Petros
>  
...

>  
>  
> The program :
> 
...
>     iterator3 begin3 = a.begin() + lowerBounds[3], end3 = a.begin() + upperBounds[3];
>     for ( iterator3 i3 = begin3; i3 != end3; ++i3 ){
>  
>         iterator2 begin2 = i3->begin() + lowerBounds[2], end2 = i3->begin() + upperBounds[2];
>         for ( iterator2 i2 = begin2; i2 != end2; ++i2 ){
>             iterator1 begin1 = i2->begin() + lowerBounds[1], end1 = i2->begin() + upperBounds[1];
>             for ( iterator1 i1 = begin1; i1 != end1; ++i1 ){
>  
>                 iterator0 begin0 = i1->begin() + lowerBounds[0], end0 = i1->begin() + upperBounds[0];
>                 for ( iterator0 i0 = begin0; i0 != end0; ++i0 ){
>  
>                     cout << *i0 << endl;
>                 }
>             }
>         }
>     }

It looks like you are indexing lowerBounds and upperBounds in the wrong order (3,2,1,0 instead of 0,1,2,3).

HTH,
Ron