Re: [Boost-users] [multi_array] std::swap and subarray

Subject: Re: [Boost-users] [multi_array] std::swap and subarray
From: alfC (alfredo.correa_at_[hidden])
Date: 2010-02-20 00:38:43

> I think this solves the problem,  (except for the fact that there it
> may be a more efficient way by swapping element by element).

complete code:
--
#include<boost/multi_array.hpp>
namespace std
{
template <typename TValue, boost::detail::multi_array::size_type K>
void swap(
  boost::detail::multi_array::sub_array<TValue, K> lhs,
  boost::detail::multi_array::sub_array<TValue, K> rhs)
{
        boost::multi_array<TValue, K> tmp = lhs;
        lhs = rhs;
        rhs = tmp;
}
} // namespace std
#include<iostream>
int main(){
       boost::multi_array<double, 2> a;
        a.resize( boost::extents[2][2] );
        for (int i = 0; i < 2; ++i)
                for (int j = 0; j < 2; ++j)
                        a[i][j] = (i+1)*10 + j+1;
       // a[0].swap(a[1]);
        std::swap( a[0], a[1] );
        for (int i = 0; i < 2; ++i)
        {
                for (int j = 0; j < 2; ++j)
                        std::cout << a[i][j] << "   ";
                std::cout << std::endl;
        }
   return 0;
}
--