Greetings Yan,


Only multi_arrays with the same size can be assigned to each other. 
You must explicitly resize B before trying to assign A to it.


Cheers,

ron


On Jun 10, 2005, at 10:31 AM, Yan Zhang wrote:


<excerpt><fontfamily><param>Arial</param><x-tad-bigger>I’m testing
multi_array with a simple example:</x-tad-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><color><param>0000,0000,FFFF</param><x-tad-bigger>typedef</x-tad-bigger></color><x-tad-bigger>
boost::multi_array<<</x-tad-bigger><color><param>0000,0000,FFFF</param><x-tad-bigger>double</x-tad-bigger></color><x-tad-bigger>,
3> array;</x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger>  array
A(boost::extents[3][4][2]);</x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><color><param>0000,8080,0000</param><x-tad-bigger> </x-tad-bigger></color></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger> 
A[0][0][0] = 3.14;</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>  array B;</x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger>  B = A;</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>When
execute the last statement B=A, you encounter assertion:</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>   
assert(std::equal(other.shape(),other.shape()+</x-tad-bigger><color><param>0000,0000,FFFF</param><x-tad-bigger>this</x-tad-bigger></color><x-tad-bigger>->num_dimensions(),</x-tad-bigger></fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param><x-tad-bigger>                     
</x-tad-bigger><color><param>0000,0000,FFFF</param><x-tad-bigger>this</x-tad-bigger></color><x-tad-bigger>->shape()));</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>in file
multi_array_ref.hpp (line 476). I used VC++ 7.1 with debug build.
Please advice.</x-tad-bigger></fontfamily></fixed>

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

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

_______________________________________________

Boost-users mailing list

Boost-users@lists.boost.org

http://lists.boost.org/mailman/listinfo.cgi/boost-users</excerpt>