Handling program arguments with C++ 20

#if __cplusplus < 202000L
# error "Requires C++ 20"
#endif

#include <iostream>
#include <span>
#include <algorithm>

int main(int argc, char const * argv[]) {
  std::cout << "C++ Version: " << __cplusplus << '\n';

  // span all arguments
  auto allargs = std::span<char const *>(argv, argc);
  for (auto const arg : allargs) {
    std::cout << arg << '\n';
  }
  std::cout.put('\n');

  // discard argv[0]
  auto args = allargs.last(argc - 1);
  std::for_each(args.begin(), args.end(), [](auto const arg) {
    std::cout << arg << '\n';
  });
  std::cout.put('\n');

  return 0;
}