[Boost-users] RE Extending Multi Array

From: frederic.bron_at_[hidden]
Date: 2008-03-04 11:12:37

It is a bad idea to derive from a class which destructor is not virtual like multi_array
You should better use composition (i.e. multi_array is a member of your matrix class).
Regards,

F. Bron

boost-users-bounces_at_[hidden] a écrit sur 04/03/2008 16:21:12 :

> Hi list members,
>
> This is a more or less a general kind of " how to extend container
> classes" question -
> I'm trying to write a class which inherits from boost::multi_array - the
> to get a kind of matrix class with some  additional service routines.
> Maybe it is a lack of experience - but I for the time being I don't know
> how to solve the problem to access the constructor of  multi_array in my
> own class to initialize my matrix class - my current guess was to use
> the "this" pointer but it had not worked out like I supposed it to do.
>
> class NetworkMultiArray: public boost::multi_array<double,3>
> {
> public:
>    NetworkMultiArray(int);
>    virtual ~NetworkMultiArray();
> };
>
> Here is the constructor code:
>
>
> NetworkMultiArray::NetworkMultiArray(int length)
> {
>      this::iterator iter3;
>      typedef this::template subarray<2>::type::iterator iter2;
>      typedef this::template subarray<1>::type::iterator iter1;
>
>    for( iter1 i = *this.begin(); iter1 != *this.end(); iter1++){
>       for(iter2 ii = (*i).begin(); ii != (*i).end(); ii++){
>          for(iter3 iii = (*ii).begin(); iii !=
> (*ii).end();  iii++){
>             *iii = 0.0 ;
>          }
>       }
>    }
> }
>  sure this does not work - and is the result from trying to adapt the
> iterator example from the documentation.
>
> my aim is to handle the NetworkMultiArray like a boost::multi_array  and
> initialize it to zero - further it would be nice if somebody could tell
> me how I could assign a length to the array and the subarrays.
> The key-point is that I want to use my class (NetworkMultiArray) like a
> multi_array by inheritance of  the multi_array features of
> boost:multi_array.
>
> Thank you very much in advance.
> Best regards
> Stefan

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