Re: [Boost-users] [multi_array] How to use std algorithms, like for_each?

Use origin() if you you want to go straight to the element level, or alternatively define a one-dimensional view of your liking and use begin() (not clear from your code what you are trying to achieve, but iVoxel = oVolume.origin() should do it). I hope this helps Antonio On 3/5/06, Christian Henning wrote:

Hi there, I'm a little confused by the documentation of the multi_array lib. The begin() is supposed to return an iterator, but dereferencing doesn't resolve into the value type. This makes it a little complicated to use multi_arrays with standard algorithms. Please consider the following code snippet which wont compile on VC 7.1.

class tVoxel { public:

typedef short tValue;

tVoxel(): _oValue( 0 ) {} tVoxel(tValue oValue): _oValue( oValue ) {}

void set( const tValue& oValue ) { _oValue = oValue; }

tValue& get() { return _oValue; } const tValue& get() const { return _oValue; }

private:

tValue _oValue; };

int _tmain(int argc, _TCHAR* argv[]) { typedef boost::multi_array tVolume;

tVolume oVolume( boost::extents[3][3][3] );

tVolume::const_iterator iVoxel = oVolume.begin(); tVolume::const_iterator iVoxelEnd = oVolume.end();

const tVoxel& oVoxel = iVoxel->get();

return 0; }

The error message goes like:

error C2039: 'get' : is not a member of 'boost::detail::multi_array::const_sub_array' with [ T=tVoxel, NumDims=2 ]

Do I miss something important, here?

Thanks for your help, Christian

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