Greetings Yan,


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


<excerpt><fontfamily><param>Times New Roman</param><bigger><bigger>Array
(const Array& other) :</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger>
boost::multi_array<<double, 2> (other)</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> {}</bigger></bigger></fontfamily>

</excerpt>

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:


<excerpt><fixed><fontfamily><param>Courier New</param><x-tad-bigger>I’m
read the posting by Thomas and replay by Ronald on how to inherit from
boost::multi_array as following:</x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger> </x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger> </x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger>On Oct 2,
2004, at 10:26 AM, Thomas Mensch wrote:</x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger> </x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger>Dear List,</x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger> </x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger>I am using
boost 1.31.0 on Linux (with gcc 3.3.2)</x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger>I would
like to create a 2D array class, which inherits  from</x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger>boost::multi_array<<double,
2> class. However I have problems</x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger>with the
copy constructor of my class Array.  Below is the code,</x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger>which I am
trying to run.</x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger> </x-tad-bigger></fontfamily></fixed>

<fontfamily><param>Times New Roman</param><bigger><bigger>#include
<<boost/multi_array.hpp></bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger> class Array</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> : public
boost::multi_array<<double,2></bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> {</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> public:</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> Array
(void) :</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger>
boost::multi_array<<double, 2> ()</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> {}</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger> Array
(const int nrow, const int ncol) :</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger>
boost::multi_array<<double, 2> (boost::extents[nrow][ncol])</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> {}</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger> Array
(const Array& other) :</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger>
boost::multi_array<<double, 2> (other)</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> {}</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger> ~Array
(void)</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> {}</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger> Array&
operator= (const Array& rhs)</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> {</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> if (&rhs !=
this)</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> {</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger>
boost::multi_array<<double, 2>::operator= (rhs);</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> }</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> return
*this;</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> }</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> }; /* class
Array */</bigger></bigger></fontfamily>

<fontfamily><param>Arial</param><x-tad-bigger> </x-tad-bigger></fontfamily>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger> </x-tad-bigger></fontfamily></fixed>


<fontfamily><param>Times New Roman</param><bigger><bigger>Ronald’s
replay:</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger>Greetings
Thomas,</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger> 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:</bigger></bigger></fontfamily>

<fontfamily><param>Times New Roman</param><bigger><bigger> template
<<class T> multi_array(T const&);</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger> that will
match your Array type better than the constructor with the signature:</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger>
multi_array(multi_array<<double,2> const&);</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger> 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.</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger> Hope this
helps.</bigger></bigger></fontfamily>



<fontfamily><param>Times New Roman</param><bigger><bigger>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<<double,2> const&)? I thought Thomas’ code is
overloading template <<class T> multi_array(T const&).</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger> </bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger>Thanks in
advance,</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger> </bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger>Yan</bigger></bigger></fontfamily>


<fontfamily><param>Times New Roman</param><bigger><bigger> </bigger></bigger></fontfamily>

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