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Ublas : |
Subject: [ublas] Preserving values when resizing c_matrices.
From: Joaquim Duran (jduran.gm_at_[hidden])
Date: 2013-09-30 19:46:47
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