Re: [Boost-users] How to inherit from boost::multi_array

From: Ronald Garcia (garcia_at_[hidden])
Date: 2004-10-02 16:22:16

On Oct 2, 2004, at 10:26 AM, Thomas Mensch wrote:

> Dear List,
>
> I am using boost 1.31.0 on Linux (with gcc 3.3.2)
> I would like to create a 2D array class, which inherits  from
> boost::multi_array<double, 2> class. However I have problems
> with the copy constructor of my class Array.  Below is the code,
> which I am trying to run.
>

Greetings Thomas,

Though you did not supply the error message from your compiler, I 
suspect that the problem is this: multi_array has a templated 
constructor of the form:
template <class T> multi_array(T const&);

that will match your Array type better than the constructor with the 
signature:

multi_array(multi_array<double,2> const&);

In short, overload resolution is not selecting the constructor that you 
desire. You'll need to coerce your Array reference to a 
multi_array<double,2>    reference before passing it to the 
constructor.

Hope this helps.

> #include <boost/multi_array.hpp>
>
> class Array
>  : public boost::multi_array<double,2>
> {
> public:
>  Array (void) :
>    boost::multi_array<double, 2> ()
>  {}
>
>  Array (const int nrow, const int ncol) :
>    boost::multi_array<double, 2> (boost::extents[nrow][ncol])
>  {}
>
>  Array (const Array& other) :
>    boost::multi_array<double, 2> (other)
>  {}
>
>  ~Array (void)
>  {}
>
>  Array& operator= (const Array& rhs)
>  {
>    if (&rhs != this)
>      {
>    boost::multi_array<double, 2>::operator= (rhs);
>      }
>    return *this;
>  }
> }; /* class Array */
>
> I guess that I forget to provide some information to my derived class,
> but I cannot find which one. Is there a way to simply inherits from 
> boost::multi_array?
>
> Many thanks in advance,
>
> Thomas
>
>
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