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

Greetings Yan, I do not recall the context of the problem you describe below, but It appears that the definition:

Array (const Array& other) : boost::multi_array (other) {}

is the problem. the above expression will call the templated constructor. I believe that the solution here is to cast "other" to the multi_array type. That should result in the proper constructor call. HTH, ron On Jun 6, 2005, at 12:09 PM, Yan Zhang wrote:

I’m read the posting by Thomas and replay by Ronald on how to inherit from boost::multi_array as following:     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 class. However I have problems with the copy constructor of my class Array.  Below is the code, which I am trying to run.   #include

class Array : public boost::multi_array { public: Array (void) : boost::multi_array () {}

Array (const int nrow, const int ncol) : boost::multi_array (boost::extents[nrow][ncol]) {}

Array (const Array& other) : boost::multi_array (other) {}

~Array (void) {}

Array& operator= (const Array& rhs) { if (&rhs != this) { boost::multi_array::operator= (rhs); } return *this; } }; /* class Array */    

Ronald’s replay:

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 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 reference before passing it to the constructor.

Hope this helps.

I had the same problem as Thomas’. I don’t quit understand Ronald’s comment. How to you overload template <class T> multi_array(T const&) instead of multi_array(multi_array const&)? I thought Thomas’ code is overloading template <class T> multi_array(T const&).

 

Thanks in advance,

 

Yan

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