//********************************************************
// The following code example is taken from the book
//  C++23 - The Complete Guide
//  by Nicolai M. Josuttis (www.josuttis.com)
//  https://www.cppstd23.com
//
// The code is licensed under a
//  Creative Commons Attribution 4.0 International License
//  https://creativecommons.org/licenses/by/4.0/
//********************************************************


#include <vector>
#include <mdspan>
#include "print2d.hpp"

int main()
{
  std::vector vec{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};

  // stride layout with overlaps => UNDEFINED BEHAVIOR:
  std::mdspan mds{vec.data(), 
                  std::layout_stride::mapping{std::extents{3, 5},
                                              std::array{1, 2}}};
  print2D(mds);

  // multiply each element by 10:
  for (std::size_t i=0; i != mds.extent(0); i++) {
    for (std::size_t j=0; j != mds.extent(1); j++) {
      mds[i, j] *= 10;   // call *= 10 for each element
    }
  }
  print2D(mds);
}