[Boost-users] c++: boost::multi_array - initialize a multi_array

Subject: [Boost-users] c++: boost::multi_array - initialize a multi_array
From: Hannan Sadar (hannan.sadar_at_[hidden])
Date: 2009-12-29 09:52:40

Hi all,

i am trying to initialize all the elements in boost::multi_array type to
zero, so far, with out success. At tried using std::fill for 1-dim
boost::multi_array and it worked. Once i tried std:fill on 2-dim
boost::multi_array it haven't worked any more.

I saw boost have

#include <boost/assign/std/vector.hpp> // for 'operator+=()'
#include <boost/assert.hpp>;

libraries but i don't know if this is the correct way to initialize a 2-dim
multi_array.

I would like to know how to initialize a boost::multi_array  in an elegant
way.

here is an example code of my multi_array (it pass compilation, but return
an error at run time):

#include <iomanip>
#include "boost/multi_array.hpp"
#include <iostream>

namespace vec {
  typedef boost::multi_array<unsigned int, 1>  uint_1d_vec_t;
  typedef boost::multi_array<unsigned int, 2>  uint_2d_vec_t;
  typedef uint_1d_vec_t::index                 index_1d_t;
  typedef uint_2d_vec_t::index                 index_2d_t;
}

int main( ) {

    unsigned int num_elements, num_bits, max_runs, m;
    num_bits = 12;
    max_runs = 5000;
    m        = 2;

    num_elements = ( 1 << num_bits );

    int kappa = 79;

    vec::uint_1d_vec_t    foo( boost::extents[ static_cast< vec::index_1d_t
>(num_elements) ]                                          );
    vec::uint_2d_vec_t    boo( boost::extents[ static_cast< vec::index_2d_t
>(num_elements) ][ static_cast< vec::index_2d_t >(kappa) ] );

    std::fill( foo.begin()          , foo.end()        , 0);
    std::fill( boo.begin()->begin() , boo.end()->end() , 0);

    std::cout << "Done" << std::endl;

    return EXIT_SUCCESS;

}

any suggestion is welcome

regards