filesystem/checkpath3.cpp

The following code example is taken from the book
C++17 - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2017
The code is licensed under a Creative Commons Attribution 4.0 International License.

---

// raw code

#include <iostream>
#include <filesystem>
#include <cstdlib>    // for EXIT_FAILURE

int main(int argc, char* argv[])
{
  if (argc < 2) {
    std::cout << "Usage: " << argv[0] << " <path> \n";
    return EXIT_FAILURE;
  }

  namespace fs = std::filesystem;  

  switch (fs::path p{argv[1]}; status(p).type()) {
    case fs::file_type::not_found:
      std::cout << "path \"" << p.string() << "\" does not exist\n";
      break;
    case fs::file_type::regular:
      std::cout << '"' << p.string() << "\" exists with "
                << file_size(p) << " bytes\n";
      break;
    case fs::file_type::directory:
      std::cout << '"' << p.string() << "\" is a directory containing:\n";
      for (const auto& e : std::filesystem::directory_iterator{p}) {
        std::cout << "  " << e.path().string() << '\n';
      }
      break;
    default:
      std::cout << '"' << p.string() << "\" is a special file\n";
      break;
  }
}