CODEWITHSUNDEEP
c++boostboost-multi-array
Peter Smit
Peter Smit

Reputation: 28716

How to assign / copy a Boost::multi_array

I want to assign a copy of a boost::multi_array. How can I do this. The object where I want to assign it to has been initialized with the default constructors.

This code does not work, because the dimensions and size are not the same

class Field {
  boost::multi_array<char, 2> m_f;

  void set_f(boost::multi_array<short, 2> &f) {
    m_f = f;
  }
}

What to use instead of m_f = f ?

Upvotes: 11

Views: 3378

Answers (1)

Kirill V. Lyadvinsky
Kirill V. Lyadvinsky

Reputation: 99565

You should resize m_f before assigning. It could look like in the following sample:

void set_f(boost::multi_array<short, 2> &f) {
    std::vector<size_t> ex;
    const size_t* shape = f.shape();
    ex.assign( shape, shape+f.num_dimensions() );
    m_f.resize( ex );
    m_f = f;
}

May be there is a better way. Conversion short to char will be implicit. You should consider using std::transform if you want explicit conversion.

Upvotes: 7

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