Re: [Boost-users] 2d array arg, f( int m, int n, int a[m][n] ) with multi_arrays ?

Subject: Re: [Boost-users] 2d array arg, f( int m, int n, int a[m][n] ) with multi_arrays ?
From: Denis-B (denis-bz-py_at_[hidden])
Date: 2009-08-11 06:11:57

Anton Daneyko wrote:
> 
> Could you add some more details to your question. It's not clear at least
> for me.
> 

Sorry that wasn't clear: I want functions of 2d array args, whose sizes are
arguments too.
In the following I presumably need to
1) use index_gen to tell multi_array that A has extents Am x An
2) cast normal C arrays to multi_array args
Thanks

#include <boost/multi_array.hpp>
using namespace boost;

typedef multi_array< float, 2 >         Array;
typedef multi_array_ref< float, 2 >     Arrayref;
typedef const_multi_array_ref< float, 2 > Arrayconstref;
typedef multi_array_types::size_type siz;

    // 2d array args with runtime sizes: A[Am][An] -> a[am][an] ?
void arrayargs( Arrayconstref A, Arrayref a, siz Am, siz An, siz am, siz an
)
{
    // how say that A is Am x An ?
    int j = 0, k = 1;
    a[j][k] = A[j][k] / 4;  // ...
}

int main( int argc, char* argv[] )
{
    int am = 100, an = 200;
    float A[am*2][an*2], a[am][an];  // vla

    arrayargs( A, a, am*2, an*2, am, an );   // how cast A, a ?
}

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