Re: [boost] ublas: Cannot use inner_prod with const matrix&

[Kresimir Fresl]

Julius Muschaweck wrote:

>> now that sparse matrix_row's works with Joerg's latest CVS upload
>> (thanks Joerg), a const& parameter that used to work with 1_29_0 doesn't
>> anymore:
>>
>> using namespace boost::numeric;
>> typedef ublas::matrix<double> TM;
>>
>> double InnerProdConst( const TM& A, const ublas::vector<double>& x )
>> {
>> return ublas::inner_prod( ublas::matrix_row< const TM >( A, 2 ), x );
>> }
>>
>> VC++.NET complains that some internal conversion loses qualifiers,
>> This does compile with a non const matrix reference parameter, the same
>> is true if I use a sparse_matrix or a compressed_matrix. I didn't try
>> the other matrix types, but since this breaks with three matrix types,
>> it looks like it has to do with matrix_row itself.

... or with VC++.NET ;o)

Joerg Walter wrote:

The following code compiles successfully with GCC 3.2.1:

#include <boost/numeric/ublas/matrix.hpp>

using namespace boost::numeric;
typedef ublas::matrix<double> TM;

double InnerProdConst( const TM& A, const ublas::vector<double>& x )
    {
    return ublas::inner_prod( ublas::matrix_row< const TM >( A, 2 ), x );
    }

int main()
    {
    ublas::matrix< double > A( 3, 3 );
    ublas::vector< double > x( 3 );
    std::cout << InnerProdConst( A, x ) << std::endl;
    }

... and with Comeau's C++ compiler 4.3.0.1, too.

Also with the following addition to `main()':

  ublas::matrix< double > const CA( A );
  std::cout << InnerProdConst( CA, x ) << std::endl;

fres


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