//********************************************************
// 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 <iostream>
#include <vector>
#include <ranges>
#include <mdspan>
#include "print3d.hpp"

int main()
{
  std::vector vec{std::from_range, std::views::iota(1, 101)};  // elements from 1 to 100

  // 2 blocks with offset 2 of 5 rows with offset 12 of 3 columns with offset 4:
  std::mdspan mds{vec.data(), 
                  std::layout_stride::mapping{std::extents{2, 5, 3},
                                              std::array{2, 12, 4}}};

  // double check that the size fits:
  if (mds.mapping().required_span_size() > vec.size()) {
    std::cerr << "ERROR: underlying data has not enough elements\n";
    return 1;
  }

  print3D(mds);
}