Re: [ublas] Preserving values when resizing c_matrices.

Subject: Re: [ublas] Preserving values when resizing c_matrices.
From: Joaquim Duran (jduran.gm_at_[hidden])
Date: 2013-10-06 17:17:58

At which branch can I pull a change? It is needed to open a boost ticket?

Joaquim Duran

2013/10/1 Joaquim Duran <jduran.gm_at_[hidden]>

> Dear all,
>
> Maybe, I don't see the full image of c_matrix, but IMO, when resizing the
> c_matrix, it is not needed copy values to preserve them.
>
> The code of the resize member function of c_matrix:
>
>
>> BOOST_UBLAS_INLINE
>
> void resize (size_type size1, size_type size2, bool preserve = true) {
>
> if (size1 > N || size2 > M)
>
> bad_size ().raise ();
>
> if (preserve) {
>
> self_type temporary (size1, size2);
>
> // Common elements to preserve
>
>  const size_type size1_min = (std::min) (size1, size1_);
>
> const size_type size2_min = (std::min) (size2, size2_);
>
> for (size_type i = 0; i != size1_min; ++i) { // indexing copy over major
>
>  for (size_type j = 0; j != size2_min; ++j) {
>
> temporary.data_[i][j] = data_[i][j];
>
> }
>
> }
>
> assign_temporary (temporary);
>
> }
>
> else {
>
> size1_ = size1;
>
> size2_ = size2;
>
> }
>
>
>> [...]
>
>
>> private:
>>
> size_type size1_;
>>
> size_type size2_;
>>
> value_type data_ [N] [M];
>
>
>>
> Thanks and Best Regards,
> Joaquim Duran
>
>