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


#include <print>
#include <mdspan>

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

  // mdspan with 1 dimension and no elements:
  std::mdspan mds1{arr.data(), 0};
  std::println("rank:  {}", mds1.rank());
  std::println("size:  {}", mds1.size());
  std::println("empty: {}\n", mds1.empty());

  // mdspan with 1 dimension and no elements and fixed extent:
  std::mdspan<int, std::extents<std::size_t, 0>> mdsf1{arr.data()};
  std::println("rank:  {}", mdsf1.rank());
  std::println("size:  {}", mdsf1.size());
  std::println("empty: {}\n", mdsf1.empty());

  // mdspan with 0 dimensions:
  std::mdspan mds0{arr.data()};
  std::println("rank:  {}", mds0.rank());
  std::println("size:  {}", mds0.size());
  std::println("empty: {}\n", mds0.empty());

  // mdspan with 0 dimensions and fixed extent:
  std::mdspan<int, std::extents<std::size_t>> mdsf0{arr.data()};
  std::println("rank:  {}", mdsf0.rank());
  std::println("size:  {}", mdsf0.size());
  std::println("empty: {}", mdsf0.empty());
}